diff --git a/abis/MyVRC25.json b/abis/MyVRC25.json
new file mode 100644
index 0000000..a121127
--- /dev/null
+++ b/abis/MyVRC25.json
@@ -0,0 +1,521 @@
+{
+  "contractName": "MyVRC25",
+  "abi": [
+    {
+      "inputs": [
+        {
+          "internalType": "string",
+          "name": "_name",
+          "type": "string"
+        },
+        {
+          "internalType": "string",
+          "name": "_symbol",
+          "type": "string"
+        },
+        {
+          "internalType": "uint8",
+          "name": "_decimals",
+          "type": "uint8"
+        },
+        {
+          "internalType": "uint256",
+          "name": "_initialSupply",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "constructor"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "spender",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        }
+      ],
+      "name": "Approval",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "issuer",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        }
+      ],
+      "name": "Fee",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "fee",
+          "type": "uint256"
+        }
+      ],
+      "name": "FeeUpdated",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "previousOwner",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+      ],
+      "name": "OwnershipTransferred",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        }
+      ],
+      "name": "Transfer",
+      "type": "event"
+    },
+    {
+      "inputs": [],
+      "name": "DOMAIN_SEPARATOR",
+      "outputs": [
+        {
+          "internalType": "bytes32",
+          "name": "",
+          "type": "bytes32"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "acceptOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "spender",
+          "type": "address"
+        }
+      ],
+      "name": "allowance",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "spender",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "approve",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        }
+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "burn",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "decimals",
+      "outputs": [
+        {
+          "internalType": "uint8",
+          "name": "",
+          "type": "uint8"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        }
+      ],
+      "name": "estimateFee",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "issuer",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "minFee",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "name",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        }
+      ],
+      "name": "nonces",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "owner",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "spender",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "deadline",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint8",
+          "name": "v",
+          "type": "uint8"
+        },
+        {
+          "internalType": "bytes32",
+          "name": "r",
+          "type": "bytes32"
+        },
+        {
+          "internalType": "bytes32",
+          "name": "s",
+          "type": "bytes32"
+        }
+      ],
+      "name": "permit",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "fee",
+          "type": "uint256"
+        }
+      ],
+      "name": "setFee",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "bytes4",
+          "name": "interfaceId",
+          "type": "bytes4"
+        }
+      ],
+      "name": "supportsInterface",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "symbol",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "totalSupply",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "recipient",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "transfer",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "sender",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "recipient",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "transferFrom",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+      ],
+      "name": "transferOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }
+  ],
+  "bytecode": 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+}
\ No newline at end of file
diff --git a/abis/MyVRC25Mintable.json b/abis/MyVRC25Mintable.json
new file mode 100644
index 0000000..f402810
--- /dev/null
+++ b/abis/MyVRC25Mintable.json
@@ -0,0 +1,545 @@
+{
+  "contractName": "MyVRC25Mintable",
+  "abi": [
+    {
+      "inputs": [
+        {
+          "internalType": "string",
+          "name": "_name",
+          "type": "string"
+        },
+        {
+          "internalType": "string",
+          "name": "_symbol",
+          "type": "string"
+        },
+        {
+          "internalType": "uint8",
+          "name": "_decimals",
+          "type": "uint8"
+        },
+        {
+          "internalType": "uint256",
+          "name": "_initialSupply",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "constructor"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "spender",
+          "type": "address"
+        },
+        {
+          "indexed": false,
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+          "name": "value",
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+      "name": "Approval",
+      "type": "event"
+    },
+    {
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+      "inputs": [
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+          "indexed": true,
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "indexed": true,
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+          "name": "to",
+          "type": "address"
+        },
+        {
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+          "internalType": "address",
+          "name": "issuer",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        }
+      ],
+      "name": "Fee",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "fee",
+          "type": "uint256"
+        }
+      ],
+      "name": "FeeUpdated",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "previousOwner",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+      ],
+      "name": "OwnershipTransferred",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        }
+      ],
+      "name": "Transfer",
+      "type": "event"
+    },
+    {
+      "inputs": [],
+      "name": "DOMAIN_SEPARATOR",
+      "outputs": [
+        {
+          "internalType": "bytes32",
+          "name": "",
+          "type": "bytes32"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "acceptOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "spender",
+          "type": "address"
+        }
+      ],
+      "name": "allowance",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "spender",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "approve",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        }
+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "burn",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "decimals",
+      "outputs": [
+        {
+          "internalType": "uint8",
+          "name": "",
+          "type": "uint8"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        }
+      ],
+      "name": "estimateFee",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "issuer",
+      "outputs": [
+        {
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+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "minFee",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "recipient",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "mint",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "name",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        }
+      ],
+      "name": "nonces",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "owner",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "spender",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "deadline",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint8",
+          "name": "v",
+          "type": "uint8"
+        },
+        {
+          "internalType": "bytes32",
+          "name": "r",
+          "type": "bytes32"
+        },
+        {
+          "internalType": "bytes32",
+          "name": "s",
+          "type": "bytes32"
+        }
+      ],
+      "name": "permit",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "fee",
+          "type": "uint256"
+        }
+      ],
+      "name": "setFee",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "bytes4",
+          "name": "interfaceId",
+          "type": "bytes4"
+        }
+      ],
+      "name": "supportsInterface",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "symbol",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "totalSupply",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "recipient",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "transfer",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "sender",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "recipient",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "transferFrom",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+      ],
+      "name": "transferOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }
+  ],
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+}
\ No newline at end of file
diff --git a/apis/account.js b/apis/account.js
index 7677dc8..cf27d86 100644
--- a/apis/account.js
+++ b/apis/account.js
@@ -4,7 +4,7 @@ const config = require('config')
 const router = express.Router()
 const { check, validationResult, query } = require('express-validator/check')
 const axios = require('axios')
-// const web3 = require('../models/blockchain/web3')
+const web3 = require('../models/blockchain/web3')
 const urljoin = require('url-join')
 
 function serializeQuery (params, prefix) {
@@ -35,7 +35,7 @@ router.get('/:account', [
     try {
         const account = req.params.account.toLowerCase()
         const { data } = await axios.get(
-            urljoin(config.get('tomoscanAPI'), `/api/accounts/${account}`)
+            urljoin(config.get('tomoscanAPI'), `/api/account/${account}`)
         )
         return res.json(data)
     } catch (error) {
@@ -47,21 +47,22 @@ router.get('/:account/listTokens', [
     query('limit')
         .isInt({ min: 0, max: 200 }).optional().withMessage('limit should greater than 0 and less than 200'),
     query('page').isNumeric({ no_symbols: true }).optional().withMessage('page must be number'),
-    check('account').exists().isLength({ min: 42, max: 42 }).withMessage('Account address is incorrect.')
+    check('account').exists().custom((account) => web3.utils.isAddress(account))
+        .withMessage('Account address is incorrect.')
 ], async (req, res, next) => {
     const errors = validationResult(req)
     if (!errors.isEmpty()) {
         return next(errors.array())
     }
     try {
-        const account = (req.params.account || '').toLowerCase()
+        const account = web3.utils.toChecksumAddress(req.params.account)
         const params = {
-            limit: req.query.limit || 1,
-            page: req.query.page || 1
+            limit: req.query.limit || 1
         }
+        params.offset = ((req.query.page || 1) - 1) * params.limit
         const query = serializeQuery(params)
         const { data } = await axios.get(
-            urljoin(config.get('tomoscanAPI'), `/api/accounts/${account}/listTokens?${query}`)
+            urljoin(config.get('tomoscanAPI'), `/api/token/listByOwner?owner=${account}&${query}`)
         )
         return res.json(data)
     } catch (error) {
diff --git a/apis/token.js b/apis/token.js
index 1b88dc8..97d9b23 100644
--- a/apis/token.js
+++ b/apis/token.js
@@ -79,7 +79,7 @@ router.post('/createToken', [
     check('decimals').exists().withMessage("'decimal' is required"),
     check('totalSupply').exists().withMessage("'totalSupply' is required"),
     check('type').exists().withMessage("'type' is required")
-        .isIn(['trc20', 'trc21']).withMessage("'type' should be 'trc20' or 'trc21'"),
+        .isIn(['trc20', 'trc21', 'vrc25']).withMessage("'type' should be 'trc20' or 'trc21'"),
     check('minFee').isFloat({ min: 0 }).exists().withMessage("'minFee' is required"),
     check('mintable').exists().isBoolean().withMessage("'mintable' must be true or false")
 ], async function (req, res, next) {
@@ -100,7 +100,10 @@ router.post('/createToken', [
     let contractCode
     let p
     if (mintable) {
-        if (type === 'trc21') {
+        if (type === 'vrc25') {
+            p = path.resolve(__dirname, '../contracts', 'MyVRC25Mintable.sol')
+            contractCode = fs.readFileSync(p, 'UTF-8')
+        } else if (type === 'trc21') {
             p = path.resolve(__dirname, '../contracts', 'TRC21Mintable.sol')
             contractCode = fs.readFileSync(p, 'UTF-8')
         } else {
@@ -108,7 +111,10 @@ router.post('/createToken', [
             contractCode = fs.readFileSync(p, 'UTF-8')
         }
     } else {
-        if (type === 'trc21') {
+        if (type === 'vrc25') {
+            p = path.resolve(__dirname, '../contracts', 'MyVRC25.sol')
+            contractCode = fs.readFileSync(p, 'UTF-8')
+        } else if (type === 'trc21') {
             p = path.resolve(__dirname, '../contracts', 'TRC21.sol')
             contractCode = fs.readFileSync(p, 'UTF-8')
         } else {
@@ -381,11 +387,15 @@ router.get('/getToken', async function (req, res, next) {
     }
 })
 
-router.get('/:token', [], async (req, res, next) => {
+router.get('/:token', [
+    check('token').exists().custom(
+        (token) => web3.utils.isAddress(token)
+    ).withMessage('token address is incorrect.')
+], async (req, res, next) => {
     try {
-        const token = req.params.token || ''
+        const token = web3.utils.toChecksumAddress(req.params.token)
         const { data } = await axios.get(
-            urljoin(config.get('tomoscanAPI'), `/api/tokens/${token}`)
+            urljoin(config.get('tomoscanAPI'), `/api/token/${token}`)
         )
         return res.json(data)
     } catch (error) {
@@ -406,26 +416,38 @@ router.get('/holders/trc21/:token', [], async (req, res, next) => {
         return next(error)
     }
 })
-router.get('/holders/:token', [], async (req, res, next) => {
+router.get('/holders/:token', [
+    check('token').exists().custom(
+        (token) => web3.utils.isAddress(token)
+    ).withMessage('token address is incorrect.')
+], async (req, res, next) => {
     try {
-        const token = req.params.token || ''
+        const token = web3.utils.toChecksumAddress(req.params.token)
         const page = req.query.page || 1
         const limit = req.query.limit || 20
         const { data } = await axios.get(
-            urljoin(config.get('tomoscanAPI'), `/api/token-holders/?address=${token}&page=${page}&limit=${limit}`)
+            urljoin(config.get('tomoscanAPI'), `/api/tokenHolder/${token}?offset=${(page - 1) * limit}&limit=${limit}`)
         )
         return res.json(data)
     } catch (error) {
         return next(error)
     }
 })
-router.get('/txes/trc20/:token', [], async (req, res, next) => {
+
+router.get('/nft/txs/:token', [
+    check('token').exists().custom(
+        (token) => web3.utils.isAddress(token)
+    ).withMessage('token address is incorrect.')
+], async (req, res, next) => {
     try {
-        const token = req.params.token || ''
+        const token = web3.utils.toChecksumAddress(req.params.token)
         const page = req.query.page || 1
         const limit = req.query.limit || 20
         const { data } = await axios.get(
-            urljoin(config.get('tomoscanAPI'), `/api/token-txs/trc20?token=${token}&page=${page}&limit=${limit}`)
+            urljoin(
+                config.get('tomoscanAPI'),
+                `/api/tokenTx/nft/list?tokenAddress=${token}&offset=${(page - 1) * limit}&limit=${limit}`
+            )
         )
         return res.json(data)
     } catch (error) {
@@ -433,13 +455,20 @@ router.get('/txes/trc20/:token', [], async (req, res, next) => {
     }
 })
 
-router.get('/txes/trc21/:token', [], async (req, res, next) => {
+router.get('/txs/:token', [
+    check('token').exists().custom(
+        (token) => web3.utils.isAddress(token)
+    ).withMessage('token address is incorrect.')
+], async (req, res, next) => {
     try {
-        const token = req.params.token || ''
+        const token = web3.utils.toChecksumAddress(req.params.token)
         const page = req.query.page || 1
         const limit = req.query.limit || 20
         const { data } = await axios.get(
-            urljoin(config.get('tomoscanAPI'), `/api/token-txs/trc21?token=${token}&page=${page}&limit=${limit}`)
+            urljoin(
+                config.get('tomoscanAPI'),
+                `/api/tokenTx/list?tokenAddress=${token}&offset=${(page - 1) * limit}&limit=${limit}`
+            )
         )
         return res.json(data)
     } catch (error) {
diff --git a/app/app.js b/app/app.js
index 00f631a..397647c 100644
--- a/app/app.js
+++ b/app/app.js
@@ -11,6 +11,8 @@ import MyTRC21Abi from '../build/contracts/MyTRC21'
 import MyTRC21MintableAbi from '../build/contracts/MyTRC21Mintable'
 import MyTRC20Abi from '../build/contracts/MyTRC20'
 import MyTRC20MintableAbi from '../build/contracts/MyTRC20Mintable'
+import MyVRC25Abi from '../build/contracts/MyVRC25'
+import MyVRC25MintableAbi from '../build/contracts/MyVRC25Mintable'
 
 import Web3 from 'web3'
 import { BootstrapVue, BootstrapVueIcons } from 'bootstrap-vue'
@@ -90,6 +92,8 @@ Vue.prototype.setupProvider = async function (provider, wjs) {
         Vue.prototype.MyTRC21Mintable = MyTRC21MintableAbi
         Vue.prototype.MyTRC20 = MyTRC20Abi
         Vue.prototype.MyTRC20Mintable = MyTRC20MintableAbi
+        Vue.prototype.MyVRC25 = MyVRC25Abi
+        Vue.prototype.MyVRC25Mintable = MyVRC25MintableAbi
         if (chainConfig.issuerAddress) {
             Vue.prototype.TRC21Issuer = new wjs.eth.Contract(
                 TRC21IssuerAritfacts.abi,
diff --git a/app/assets/scss/components/_token.scss b/app/assets/scss/components/_token.scss
index 8cee10a..4e12c46 100644
--- a/app/assets/scss/components/_token.scss
+++ b/app/assets/scss/components/_token.scss
@@ -51,7 +51,7 @@
         margin-left: 5px;
     }
     .apply-tomoz {
-        background: $background-violet;
+        background: $background-blue;
         @include fsz(14);
         // border-radius: 30px;
         padding: 2px 10px;
diff --git a/app/assets/scss/settings/_colors.scss b/app/assets/scss/settings/_colors.scss
index 1eca90e..5daaa33 100644
--- a/app/assets/scss/settings/_colors.scss
+++ b/app/assets/scss/settings/_colors.scss
@@ -39,8 +39,8 @@ $background-white: #ffffff;
 $background-oranges: #141414;
 $background-blue: #766B60;
 $background-blue-active: #766B60;
-$background-violet: #5565c7;
-$background-violet-active: #3D4DAC;
+$background-violet: #766B60;
+$background-violet-active: #766B60;
 
 $background-primary: #EBE9E5;
 
diff --git a/app/components/Token.vue b/app/components/Token.vue
index 75b7c88..e8d233e 100644
--- a/app/components/Token.vue
+++ b/app/components/Token.vue
@@ -9,6 +9,11 @@
                             v-if="!moreInfo">
                             {{ token.symbol }}
                         </span>
+                        <span
+                            v-if="token.type === 'vrc25'"
+                            class="apply-trc">
+                            VRC-25
+                        </span>
                         <span
                             v-if="token.type === 'trc21'"
                             class="apply-trc">
@@ -51,15 +56,16 @@
                         <ul>
                             <li>
                                 <b-link
-                                    v-if="token.type === 'trc21' && !isAppliedZ && account === contractCreation"
-                                    :to="'/tomozcondition/' + address"
+                                    v-if="!isAppliedZ
+                                    && account === contractCreation"
+                                    :to="'/viczcondition/' + address"
                                     class="tmp-btn-violet"
                                     style="width: 240px">
                                     <span class="tm-icon-tomoz-new-w mr-1">
                                         <span class="path1"/><span class="path2"/>
                                     </span>
                                     <!-- <i class="tm-icon-tomoz mr-1"/> -->
-                                    Apply to Viction Zero Gas Protocol
+                                    Apply Zero Gas Protocol
                                 </b-link>
                             </li>
                             <!-- <li>
@@ -86,32 +92,6 @@
                                         class="tmp-btn-transparent">
                                         <i class="tm-icon-cog" />
                                     </template>
-                                    <!-- <b-dropdown-item
-                                        v-if="token.type === 'trc21' && !isAppliedZ && account === contractCreation"
-                                        :to="'/tomozcondition/' + address">
-                                        Apply to Viction Zero Gas Protocol
-                                    </b-dropdown-item>
-                                    <b-dropdown-item
-                                        v-if="token.type === 'trc21' && !isAppliedX && account === contractCreation"
-                                        :to="'/tomoxcondition/' + address">
-                                        Apply to TomoX Protocol
-                                    </b-dropdown-item> -->
-                                    <!-- <b-dropdown-item
-                                        v-if="isBridgeToken && !isAppliedB">
-                                        <div id="applyBridge">
-                                            <b-link
-                                                :disabled="!isAppliedZ"
-                                                :style="!isAppliedZ ? `cursor: not-allowed` : ''"
-                                                @click="showAnnounceBridgeModal">
-                                                Apply to TomoBridge
-                                            </b-link>
-                                        </div>
-                                        <b-tooltip
-                                            v-if="!isAppliedZ"
-                                            target="applyBridge">
-                                            Apply to TomoZ is required
-                                        </b-tooltip>
-                                    </b-dropdown-item> -->
                                     <b-dropdown-item
                                         :to="'/viewToken/' + address">
                                         View Token Info
@@ -122,28 +102,16 @@
                                         Update Token Info
                                     </b-dropdown-item>
                                     <b-dropdown-item
-                                        v-if="!token.contract"
-                                        :href="config.tomoscanUrl + '/contracts/verify/' + address"
-                                        target="_blank">
-                                        Verify & Publish Contract
-                                    </b-dropdown-item>
-                                    <b-dropdown-divider/>
-                                    <!-- <b-dropdown-item
-                                        :href="config.tomowalletUrl"
-                                        target="_blank">
-                                        Transfer Token
-                                    </b-dropdown-item> -->
-                                    <b-dropdown-item
-                                        v-if="token.type === 'trc21' && isAppliedZ && contractCreation === account"
+                                        v-if="isAppliedZ
+                                        && contractCreation === account"
                                         :to="'/edittransactionsfee/' + address">
                                         Edit transaction fee
                                     </b-dropdown-item>
                                     <b-dropdown-item
-                                        v-if="token.type === 'trc21' && isAppliedZ"
+                                        v-if="isAppliedZ"
                                         :to="'/depositfee/' + address">
-                                        Deposit VRC-21 fee fund
+                                        Deposit fee fund
                                     </b-dropdown-item>
-                                    <b-dropdown-divider v-if="token.isMintable"/>
                                     <b-dropdown-item
                                         v-if="token.isMintable"
                                         :to="'/reissueToken/' + address">
@@ -209,10 +177,10 @@
                                             </p>
                                             <p class="common_txt_ellipsis text-blue">
                                                 <a
-                                                    :title="token.hash"
+                                                    :title="token.address"
                                                     :href="config.tomoscanUrl + '/token/' + address"
                                                     target="_blank">
-                                                    {{ token.hash }}
+                                                    {{ token.address }}
                                                 </a>
                                             </p>
                                         </li>
@@ -220,7 +188,7 @@
                                             <p class="title-small">Decimals</p>
                                             <p>{{ token.decimals }}</p>
                                         </li>
-                                        <li v-if="token.type === 'trc21' && isAppliedZ">
+                                        <li v-if="isAppliedZ">
                                             <p class="title-small">
                                                 Transactions fee
                                                 <b-link
@@ -254,8 +222,8 @@
                                                 </span> -->
                                             </div>
                                         </li>
-                                        <li v-if="token.type === 'trc21' && isAppliedZ">
-                                            <p class="title-small">VRC-21 fee fund</p>
+                                        <li v-if="isAppliedZ">
+                                            <p class="title-small">VRC fee fund</p>
                                             <div class="flex-box">
                                                 <span>{{ formatNumber(poolingFee) }} VIC</span>
                                                 <span>
@@ -556,39 +524,39 @@ export default {
             const self = this
             const { data } = await axios.get(`/api/token/${self.address}`)
             self.token = data
-            self.token.contract = data.hash
+            self.token.address = data.address.toLowerCase()
+            self.token.contract = data.address.toLowerCase()
             self.tokenName = data.name
             self.symbol = data.symbol
-            self.contractCreation = data.contractCreation
+            self.contractCreation = data.owner.toLowerCase()
 
             self.$store.state.token = self.token
         },
         getTokenTransfer () {
             const self = this
             self.loading = true
-            const isTrc21 = self.token.type
             const params = {
                 limit: self.transferPerPage,
                 page: self.transferCurrentPage
             }
             const query = self.serializeQuery(params)
-            axios.get(`/api/token/txes/${isTrc21}/${this.address}?${query}`).then(response => {
+            axios.get(`/api/token/txs/${this.address}?${query}`).then(response => {
                 const data = response.data
                 if (data) {
                     const items = []
-                    data.items.map(m => {
+                    data.data.map(m => {
                         items.push({
                             txn_hash: m.transactionHash,
-                            age: moment(m.blockTime).fromNow(),
+                            age: moment(m.timestamp * 1000).fromNow(),
                             from: m.from,
                             to: m.to,
                             amount: self.formatNumber(
-                                new BigNumber(m.value).div(10 ** self.token.decimals).toNumber())
+                                new BigNumber(m.value).div(10 ** m.tokenDecimals).toNumber())
                         })
                     })
                     self.transferItems = items
                     self.transferRows = data.total
-                    self.tokenTransfers = response.data.total
+                    self.tokenTransfers = data.total
                     self.loading = false
                 }
             }).catch(error => {
@@ -604,23 +572,22 @@ export default {
                 page: self.holdersCurrentPage,
                 limit: self.holdersPerPage
             }
-            const isTrc21 = self.token.type === 'trc21' ? 'trc21/' : ''
             const query = self.serializeQuery(params)
-            axios.get(`/api/token/holders/${isTrc21}${this.address}?${query}`).then(response => {
+            axios.get(`/api/token/holders/${this.address}?${query}`).then(response => {
                 const data = response.data
                 if (data) {
                     const items = []
-                    data.items.map(m => {
+                    data.data.map((m, mIndex) => {
                         items.push({
-                            rank: m.rank,
-                            address: m.hash,
+                            rank: mIndex + 1,
+                            address: m.address,
                             amount: self.formatNumber(m.quantityNumber),
-                            percentage: m.percentage
+                            percentage: (m.quantityNumber * 100 / self.token.totalSupplyNumber).toFixed(2)
                         })
                     })
                     self.holdersItems = items
                     self.holdersRows = data.total
-                    self.tokenHolders = response.data.total
+                    self.tokenHolders = data.total
                     self.loading = false
                 }
             }).catch(error => {
@@ -650,7 +617,7 @@ export default {
             if (web3) {
                 const contract = this.TRC21Issuer
                 contract.methods.getTokenCapacity(this.address).call().then(capacity => {
-                    let balance = new BigNumber(this.web3.utils.hexToNumberString(capacity))
+                    let balance = new BigNumber(capacity > 0 ? this.web3.utils.hexToNumberString(capacity) : 0)
                     this.poolingFee = balance.div(10 ** 18).toNumber()
                     this.$store.state.token['poolingFee'] = this.poolingFee
                 }).catch(error => {
@@ -677,8 +644,11 @@ export default {
         },
         checkAppliedZ () {
             const contract = this.TRC21Issuer
+            if (this.token.type !== 'vrc25' && this.token.type !== 'vrc21') {
+                return false
+            }
             if (contract) {
-                contract.methods.tokens.call()
+                contract.methods.tokens().call()
                     .then(result => {
                         if (result && result.length > 0) {
                             const lowerCaseArr = result.map(m => m.toLowerCase())
diff --git a/app/components/ViewToken.vue b/app/components/ViewToken.vue
index 765b3fb..ba72507 100644
--- a/app/components/ViewToken.vue
+++ b/app/components/ViewToken.vue
@@ -67,17 +67,23 @@
                     <tr style="grid-template-columns: 100%;">
                         <td colspan="2">
                             <div
-                                v-if="token.type === 'trc21' || token.type === 'trc20'">
-                                <div class="pb-2 text-danger">Generated following tomochain sourcecode,
+                                v-if="sourceCode">
+                                <div class="pb-2 text-danger">Generated following Viction sourcecode,
                                 if not your sourcecode, please ignore</div>
                                 <codemirror
                                     ref="code"
                                     v-model="sourceCode"
                                     :options="{mode:'application/ld+json',styleActiveLine:false}"/>
                             </div>
-                            <span
-                                v-else
-                                class="w-100">This is not VRC21 or VRC20 token</span>
+                            <div v-else>
+                                <span class="w-100 pb-2 text-danger">Source code is not verified</span>
+                                <a
+                                    :href="config.tomoscanUrl + '/address/' + token.address + '#code'"
+                                    target="_blank">
+                                    Verify code on Explorer
+                                </a>
+                            </div>
+
                         </td>
                         <td />
                     </tr>
@@ -91,7 +97,6 @@
 
 <script>
 import axios from 'axios'
-import urljoin from 'url-join'
 import store from 'store'
 export default {
     name: 'App',
@@ -170,17 +175,23 @@ export default {
         async getTokenDetail () {
             const self = this
             const { data } = await axios.get(`/api/account/${self.address}`)
-            const token = data.token
+            const token = data.tokenData
             if (token) {
+                const { data : tokenData } = await axios.get(`/api/token/${self.address}`)
                 self.token = {
-                    name: token.name,
-                    symbol: token.symbol,
-                    decimals: token.decimals,
-                    type: token.type || '',
-                    mintable: token.isMintable,
-                    totalSupply: token.totalSupplyNumber
+                    address: tokenData.address,
+                    name: tokenData.name,
+                    symbol: tokenData.symbol,
+                    decimals: tokenData.decimals,
+                    type: tokenData.type || '',
+                    mintable: tokenData.isMintable,
+                    totalSupply: tokenData.totalSupplyNumber
                 }
             }
+            if (data.contractData && data.contractData.sourceCode) {
+                const fileName = Object.keys(data.contractData.sourceCode)[0]
+                self.sourceCode = data.contractData.sourceCode[fileName].content
+            }
             self.contractCreation = data.contractCreation
         },
         async getLogo () {
@@ -195,32 +206,34 @@ export default {
         },
         async checkBridgeToken () {
             const self = this
-            try {
-                const contract = new this.web3.eth.Contract(
-                    this.TomoBridgeWrapToken.abi,
-                    this.address
-                )
-                await contract.methods.original_contract.call()
-                    .then(result => {
-                        self.isBridgeToken = (this.web3.utils.isAddress(result) || false)
-                        self.tokenERC20Address = result
-                        if (!result) {
-                            self.isBridgeToken = false
-                            return
-                        }
-                        self.tokenAddressURL = urljoin(
-                            self.config.etherChain.etherScanURL,
-                            'token',
-                            result
-                        )
-                    })
-                    .catch(error => {
-                        console.log(error)
-                        self.isBridgeToken = false
-                    })
-            } catch (error) {
-                console.log(error)
-            }
+            self.isBridgeToken = false
+            return false
+            // try {
+            //     const contract = new this.web3.eth.Contract(
+            //         this.TomoBridgeWrapToken.abi,
+            //         this.address
+            //     )
+            //     await contract.methods.original_contract().call()
+            //         .then(result => {
+            //             self.isBridgeToken = (this.web3.utils.isAddress(result) || false)
+            //             self.tokenERC20Address = result
+            //             if (!result) {
+            //                 self.isBridgeToken = false
+            //                 return
+            //             }
+            //             self.tokenAddressURL = urljoin(
+            //                 self.config.etherChain.etherScanURL,
+            //                 'token',
+            //                 result
+            //             )
+            //         })
+            //         .catch(error => {
+            //             console.log(error)
+            //             self.isBridgeToken = false
+            //         })
+            // } catch (error) {
+            //     console.log(error)
+            // }
         }
     }
 }
diff --git a/app/components/accounts/ListToken.vue b/app/components/accounts/ListToken.vue
index 7d16c19..03fc7ed 100644
--- a/app/components/accounts/ListToken.vue
+++ b/app/components/accounts/ListToken.vue
@@ -45,10 +45,10 @@
                                 #cell(price)="data">
                                 {{ data.item.price || '---' }}
                             </template>
-                            <template
+                            <!-- <template
                                 #cell(totalSupply)="data">
-                                {{ formatNumber(data.value) }}
-                            </template>
+                                {{ formatNumber(data.supply) }}
+                            </template> -->
                             <template
                                 #cell(volume)="data">
                                 {{ data.item.volume || '---' }}
@@ -83,7 +83,7 @@
                                     </template>
                                     <b-dropdown-item
                                         v-if="data.type === 'trc21' && !data.item.applytomoz"
-                                        :to="'/tomozcondition/' + data.item.hash">
+                                        :to="'/viczcondition/' + data.item.hash">
                                         Apply to VICZ
                                     </b-dropdown-item>
                                     <!-- <b-dropdown-item
@@ -109,7 +109,7 @@
                                 </b-dropdown>
                                 <!-- <router-link
                                     v-if="!data.value"
-                                    :to="`/tomozcondition/${data.item.hash}`">
+                                    :to="`/viczcondition/${data.item.hash}`">
                                     Apply VICZ
                                 </router-link> -->
                             </template>
@@ -162,20 +162,20 @@ export default {
         return {
             listokenCurrentPage: this.$store.state.listokenCurrentPage || 1,
             listokenRows: 0,
-            listokenPerPage: 7,
+            listokenPerPage: 8,
             listokenFields: [
                 { key: 'logo', label: '', variant: 'sp-text-center' },
                 { key: 'token', label: 'Token' },
                 { key: 'ownerBalance', label: 'Balance' },
                 { key: 'holders', label: 'Holders' },
                 { key: 'price', label: 'Price' },
-                { key: 'value', label: 'Value' },
+                { key: 'supply', label: 'Supply' },
                 // { key: 'totalSupply', label: 'Total supply' },
                 // { key: 'transferToken', label: '', variant: 'sp-text-center' },
                 { key: 'applytomoz', label: '', variant: 'sp-text-center' }
             ],
             listokenItems: [],
-            sortBy: 'totalSupplyNumber',
+            sortBy: 'price',
             sortDesc: true,
             tokens: [],
             loading: false,
@@ -209,24 +209,32 @@ export default {
                 const query = self.serializeQuery(params)
                 let promises = this.checkAppliedZ()
                 let appliedXPromise = this.checkAppliedX()
-                const { data } = await axios.get(`/api/account/${self.account}/listTokens?${query}`)
+                const { data } = await axios.get(
+                    `/api/account/${self.account}/listTokens?${query}`
+                )
                 self.appliedZList = await promises
                 self.appliedXList = await appliedXPromise
-                if (data.items.length > 0) {
-                    const map = await Promise.all(data.items.map(async i => {
+                if (data.data.length > 0) {
+                    const map = await Promise.all(data.data.map(async (i) => {
+                        const ownerBalance = await self.getOwnerBalance(i.address, i.decimals)
+                        const ownerBalanceStr = ownerBalance ? this.formatNumber(ownerBalance) : '---'
+                        const ownerValueStr = i.price ? `(${ownerBalance.multipliedBy(i.price)}$)` : ''
                         return {
                             name: i.name,
                             token: `${i.name} (${i.symbol})`,
                             symbol: i.symbol,
-                            hash: i.hash,
-                            price: '---',
-                            value: '---',
-                            totalSupply: i.totalSupplyNumber,
-                            ownerBalance: this.formatNumber(await self.getOwnerBalance(i.hash, i.decimals)),
-                            holders: i.holders || '---',
-                            applytomoz: ((self.appliedZList || []).indexOf(i.hash) > -1),
-                            applytomox: ((self.appliedXList || []).indexOf(i.hash) > -1),
-                            logo: await self.getLogo(i.hash),
+                            hash: i.address,
+                            price: i.price ? i.price : '---',
+                            // totalSupply: this.formatNumber(i.totalSupplyNumber),
+                            ownerBalance: ownerBalanceStr + ownerValueStr,
+                            supply: this.formatNumber(new BigNumber(
+                                i.circulatingSupply ? i.circulatingSupply : i.totalSupply
+                            ).div(10 ** i.decimals)
+                            ),
+                            holders: i.holder || '---',
+                            applytomoz: ((self.appliedZList || []).indexOf(i.address) > -1),
+                            applytomox: ((self.appliedXList || []).indexOf(i.address) > -1),
+                            logo: await self.getLogo(i.address),
                             mintable: i.isMintable,
                             type: i.type
                         }
@@ -259,7 +267,7 @@ export default {
         async checkAppliedZ () {
             const contract = await this.TRC21Issuer
             if (contract) {
-                const result = await contract.methods.tokens.call()
+                const result = await contract.methods.tokens().call()
                 if (result && result.length > 0) {
                     let lowerCaseArr = result.map(m => m.toLowerCase())
                     return lowerCaseArr
@@ -270,7 +278,7 @@ export default {
         async checkAppliedX () {
             const contract = await this.TomoXListing
             if (contract) {
-                const result = await contract.methods.tokens.call()
+                const result = await contract.methods.tokens().call()
                 if (result && result.length > 0) {
                     let lowerCaseArr = result.map(m => m.toLowerCase())
                     return lowerCaseArr
diff --git a/app/components/applying/ConfirmToken.vue b/app/components/applying/ConfirmToken.vue
index 3dc25b2..5660b04 100644
--- a/app/components/applying/ConfirmToken.vue
+++ b/app/components/applying/ConfirmToken.vue
@@ -351,6 +351,28 @@ export default {
             }
         },
         getAbi () {
+            if (this.type === 'vrc25' && this.mintable) {
+                return {
+                    contractAbi: this.MyVRC25Mintable,
+                    arguments: [
+                        'example',
+                        'example',
+                        18,
+                        (new BigNumber(100000000).multipliedBy(10 ** 18)).toString(10)
+                    ]
+                }
+            }
+            if (this.type === 'vrc25' && !this.mintable) {
+                return {
+                    contractAbi: this.MyVRC25,
+                    arguments: [
+                        'example',
+                        'example',
+                        18,
+                        (new BigNumber(100000000).multipliedBy(10 ** 18)).toString(10)
+                    ]
+                }
+            }
             if (this.type === 'trc20' && this.mintable) {
                 return {
                     contractAbi: this.MyTRC20Mintable,
diff --git a/app/components/applying/CreateToken.vue b/app/components/applying/CreateToken.vue
index 654dca1..b74e83c 100644
--- a/app/components/applying/CreateToken.vue
+++ b/app/components/applying/CreateToken.vue
@@ -202,6 +202,23 @@
                         name="radio-sub-component">
                         <b-row class="mt-3 mt-md-0">
                             <b-col
+                                cols="3"
+                                md="4">
+                                <b-form-radio
+                                    value="vrc25"
+                                    class="font-weight-bold">
+                                    VRC25
+                                    <i
+                                        id="vrc25"
+                                        class="tm-icon-info mb-2"/>
+                                    <!-- <span class="new-gif">new</span> -->
+                                    <b-tooltip
+                                        target="vrc25">
+                                        VRC25 is the standard token that goes along with Viction Zero Gas Protocol.
+                                    </b-tooltip>
+                                </b-form-radio>
+                            </b-col>
+                            <!-- <b-col
                                 cols="3"
                                 md="4">
                                 <b-form-radio
@@ -211,7 +228,6 @@
                                     <i
                                         id="trc20"
                                         class="tm-icon-info mb-2"/>
-                                    <!-- <span class="new-gif">new</span> -->
                                     <b-tooltip
                                         target="trc20">
                                         VRC20 is the most standard token on Viction.
@@ -234,14 +250,14 @@
                                         Transaction fees are paid by the token itself.
                                     </b-tooltip>
                                 </b-form-radio>
-                            </b-col>
-                            <b-col
+                            </b-col> -->
+                            <!-- <b-col
                                 cols="4"
                                 md="3">
                                 <div
                                     class="tokenInfotrc2021"
                                     @click="showModal">Differences?</div>
-                            </b-col>
+                            </b-col> -->
                         </b-row>
                     </b-form-radio-group>
                 </b-form-group>
@@ -328,7 +344,7 @@ export default {
             decimals: 18,
             totalSupply: '',
             account: '',
-            type: 'trc20',
+            type: 'vrc25',
             balance: 0,
             txFee: 0,
             gasPrice: 250000000,
@@ -342,7 +358,7 @@ export default {
             warningSymbol: '',
             warningDecimals: '',
             warningMintable: '',
-            mintable: '',
+            mintable: true,
             tokenInfoFields: [
                 { key: 'title', label: '' },
                 { key: 'trc20', label: 'TRC20' },
@@ -471,6 +487,28 @@ export default {
             }
         },
         getAbi () {
+            if (this.type === 'vrc25' && this.mintable) {
+                return {
+                    contractAbi: this.MyVRC25Mintable,
+                    arguments: [
+                        'example',
+                        'example',
+                        18,
+                        (new BigNumber(100000000).multipliedBy(10 ** 18)).toString(10)
+                    ]
+                }
+            }
+            if (this.type === 'vrc25' && !this.mintable) {
+                return {
+                    contractAbi: this.MyVRC25,
+                    arguments: [
+                        'example',
+                        'example',
+                        18,
+                        (new BigNumber(100000000).multipliedBy(10 ** 18)).toString(10)
+                    ]
+                }
+            }
             if (this.type === 'trc20' && this.mintable) {
                 return {
                     contractAbi: this.MyTRC20Mintable,
diff --git a/app/components/applying/bridgeToken/ConfirmBridgeToken.vue b/app/components/applying/bridgeToken/ConfirmBridgeToken.vue
index 7ac8d08..b324d03 100644
--- a/app/components/applying/bridgeToken/ConfirmBridgeToken.vue
+++ b/app/components/applying/bridgeToken/ConfirmBridgeToken.vue
@@ -93,7 +93,7 @@
                             class="btn tmp-btn-boder-violet btn-secondary">Token detail
                         </router-link>
                         <!-- <router-link
-                            :to="'/tomozcondition/' + contractAddress"
+                            :to="'/viczcondition/' + contractAddress"
                             class="tmp-btn-violet">
                             <span class="tm-icon-tomoz-new-w mr-1">
                                 <span class="path1"/><span class="path2"/>
diff --git a/app/components/applytomo/TomoZApplication.vue b/app/components/applytomo/VicZApplication.vue
similarity index 97%
rename from app/components/applytomo/TomoZApplication.vue
rename to app/components/applytomo/VicZApplication.vue
index 373ceef..4b276e2 100644
--- a/app/components/applytomo/TomoZApplication.vue
+++ b/app/components/applytomo/VicZApplication.vue
@@ -6,7 +6,7 @@
                     <span class="tm-icon-tomoz-new"><span class="path1"/><span class="path2"/></span>
                 </p>
                 <!-- <p><i class="tm-icon-tomoz-new"/></p> -->
-                <h2 class="tmp-title-large">TomoZ Protocol Application</h2>
+                <h2 class="tmp-title-large">Zero Gas Protocol Application</h2>
             </div>
             <b-form
                 class="tmp-form-one"
@@ -60,7 +60,7 @@ import {
     minValue
 } from 'vuelidate/lib/validators'
 export default {
-    name: 'TomoZApplication',
+    name: 'VicZApplication',
     mixins: [validationMixin],
     data () {
         return {
@@ -146,7 +146,7 @@ export default {
             this.$router.go(-2)
         },
         confirm () {
-            this.$router.push({ name: 'TomoZConfirm',
+            this.$router.push({ name: 'VicZConfirm',
                 params: {
                     address: this.address,
                     token: this.token,
diff --git a/app/components/applytomo/TomoZApplied.vue b/app/components/applytomo/VicZApplied.vue
similarity index 93%
rename from app/components/applytomo/TomoZApplied.vue
rename to app/components/applytomo/VicZApplied.vue
index c25c2c9..af8876f 100644
--- a/app/components/applytomo/TomoZApplied.vue
+++ b/app/components/applytomo/VicZApplied.vue
@@ -5,7 +5,7 @@
                 <p>
                     <span class="tm-icon-tomoz-new"><span class="path1"/><span class="path2"/></span>
                 </p>
-                <h2 class="tmp-title-large">TomoZ Protocol Application</h2>
+                <h2 class="tmp-title-large">Zero Gas Protocol Application</h2>
             </div>
             <b-form
                 class="tmp-form-one"
diff --git a/app/components/applytomo/TomoZCondition.vue b/app/components/applytomo/VicZCondition.vue
similarity index 89%
rename from app/components/applytomo/TomoZCondition.vue
rename to app/components/applytomo/VicZCondition.vue
index 1a69166..cbdc6fe 100644
--- a/app/components/applytomo/TomoZCondition.vue
+++ b/app/components/applytomo/VicZCondition.vue
@@ -2,14 +2,14 @@
     <div class="container container-medium">
         <div class="tomo-apply text-center">
             <h2 class="tmp-title-large">Pay fee by {{ token.name }} token</h2>
-            <div class="about-tomoz">
-                <h6 class="tmp-title-normal weightbold">What is TomoZ</h6>
+            <div class="about-VicZ">
+                <h6 class="tmp-title-normal weightbold">What is Zero Gas Protocol (VicZ)</h6>
                 <p>
-                    TomoZ - the first on-chain protocol that offers the ability for any user
+                    VicZ - the first on-chain protocol that offers the ability for any user
                     to pay transaction fees with the same token the user is holding. Along with
-                    the TomoZ protocol, TRC21 is also proposed as a new smart contract-based
+                    the VicZ protocol, VRC25 is also proposed as a new smart contract-based
                     token standard that allows users to pay fees of any transaction sent to a
-                    TRC21 smart contract in terms of the TRC21 token itself, without holding VIC in their wallet.
+                    VRC25 smart contract in terms of the VRC25 token itself, without holding VIC in their wallet.
                 </p>
             </div>
             <div class="box-condition">
@@ -23,7 +23,7 @@
                         </p>
                         <p>
                             The token issuer has to deposit a minimum amount of 10 VIC to apply
-                            to the TomoZ protocol. The deposit cannot be withdrawn.
+                            to the VicZ protocol. The deposit cannot be withdrawn.
                         </p>
                     </b-col>
                     <b-col
@@ -64,7 +64,7 @@
             </div>
             <div class="btn-box">
                 <b-button
-                    :to="'/tomozapplication/' + address"
+                    :to="'/VicZapplication/' + address"
                     class="tmp-btn-violet">
                     I understand
                 </b-button>
@@ -77,7 +77,7 @@
 import store from 'store'
 import axios from 'axios'
 export default {
-    name: 'ApplyTomoZ',
+    name: 'ApplyVicZ',
     components: { },
     data () {
         return {
diff --git a/app/components/applytomo/TomoZConfirm.vue b/app/components/applytomo/VicZConfirm.vue
similarity index 97%
rename from app/components/applytomo/TomoZConfirm.vue
rename to app/components/applytomo/VicZConfirm.vue
index 8005e66..67152ca 100644
--- a/app/components/applytomo/TomoZConfirm.vue
+++ b/app/components/applytomo/VicZConfirm.vue
@@ -11,7 +11,7 @@
                     <i class="tm-icon-tomoz-new"><span class="path1"/><span class="path2"/></i>
                 </p>
                 <!-- <p><i class="tm-icon-tomoz-new"/></p> -->
-                <h2 class="tmp-title-large">TomoZ Protocol Application</h2>
+                <h2 class="tmp-title-large">Zero Gas Protocol Application</h2>
             </div>
             <div class="tmp-table-three">
                 <table>
@@ -47,14 +47,14 @@
             </div>
             <div class="btn-box">
                 <b-button
-                    :to="'/tomozapplication/' + address"
+                    :to="'/viczapplication/' + address"
                     class="tmp-btn-boder-violet btn-min">
                     Back
                 </b-button>
                 <b-button
                     class="tmp-btn-violet"
                     @click="applyTomoZ">
-                    Apply to TomoZ protocol
+                    Apply Zero Gas protocol
                 </b-button>
             </div>
             <b-modal
@@ -104,11 +104,11 @@
 import store from 'store'
 import axios from 'axios'
 import BigNumber from 'bignumber.js'
-import TomoZApplied from './TomoZApplied.vue'
+import VicZApplied from './VicZApplied.vue'
 export default {
     name: 'TomoZConfirm',
     components: {
-        TomoZApplied
+        VicZApplied
     },
     data () {
         return {
diff --git a/app/components/burn/BurnToken.vue b/app/components/burn/BurnToken.vue
index ad58cf8..102988d 100644
--- a/app/components/burn/BurnToken.vue
+++ b/app/components/burn/BurnToken.vue
@@ -130,11 +130,11 @@ export default {
     methods: {
         async getTokenDetail () {
             const self = this
-            const { data } = await axios.get(`/api/account/${self.address}`)
-            const token = data.token
+            const { data } = await axios.get(`/api/token/${self.address}`)
+            const token = data
             self.token = token || {}
             self.totalSupply = self.token.totalSupplyNumber
-            self.contractCreation = data.contractCreation
+            self.contractCreation = data.owner.toLowerCase()
         },
         getOwnerBalance () {
             const web3 = this.web3
diff --git a/app/components/burn/BurnTokenConfirm.vue b/app/components/burn/BurnTokenConfirm.vue
index d6ce34d..7ceb5d0 100644
--- a/app/components/burn/BurnTokenConfirm.vue
+++ b/app/components/burn/BurnTokenConfirm.vue
@@ -142,10 +142,10 @@ export default {
     methods: {
         async getTokenDetail () {
             const self = this
-            const { data } = await axios.get(`/api/account/${self.address}`)
-            const token = data.token
+            const { data } = await axios.get(`/api/token/${self.address}`)
+            const token = data
             self.token = token || {}
-            self.contractCreation = (data.contractCreation || '').toLowerCase()
+            self.contractCreation = (data.owner || '').toLowerCase()
         },
         getOwnerBalance () {
             const web3 = this.web3
diff --git a/app/components/donate/ConfirmDonate.vue b/app/components/donate/ConfirmDonate.vue
index 36f9e2d..ff2a69f 100644
--- a/app/components/donate/ConfirmDonate.vue
+++ b/app/components/donate/ConfirmDonate.vue
@@ -2,7 +2,7 @@
     <div class="container container-small">
         <div class="confirm-table">
             <div class="info-header text-center">
-                <h2 class="tmp-title-large">Donate TRC-21 transaction fee</h2>
+                <h2 class="tmp-title-large">Donate transaction fee</h2>
             </div>
             <div class="tmp-table-three">
                 <table>
diff --git a/app/components/donate/DonateToken.vue b/app/components/donate/DonateToken.vue
index afa9dcc..81dfb23 100644
--- a/app/components/donate/DonateToken.vue
+++ b/app/components/donate/DonateToken.vue
@@ -1,9 +1,9 @@
 <template>
     <div class="container container-small">
         <div class="tomo-donate">
-            <h2 class="tmp-title-large">Donate TRC-21 transaction fee</h2>
+            <h2 class="tmp-title-large">Donate transaction fee</h2>
             <div class="box-desc">
-                <h6 class="tmp-title-normal weightbold">Why do we need to donate TRC-21 transaction fee?</h6>
+                <h6 class="tmp-title-normal weightbold">Why do we need to transaction fee?</h6>
                 <p>
                     Token transactions will not be processed if the remaining deposit is not
                     enough to pay transaction fees. In such a case, to resume the processing
@@ -47,7 +47,7 @@
                         class="text-danger pt-2">Token not found</div>
                     <div
                         v-if="!isAppliedZ && tokenExist"
-                        class="text-danger pt-2">Token has not been applied to VIC yet</div>
+                        class="text-danger pt-2">Token has not been applied to VICz yet</div>
                 </b-form-group>
                 <b-form-group
                     :description="`Available balance:  ${balance} VIC`"
@@ -187,7 +187,7 @@ export default {
         },
         getPoolingFee () {
             const contract = this.TRC21Issuer
-            contract.methods.tokens.call().then(result => {
+            contract.methods.tokens().call().then(result => {
                 const lowerCaseArr = result.map(m => m.toLowerCase())
                 if (lowerCaseArr.indexOf(this.tokenAddress) > -1) {
                     this.isAppliedZ = true
diff --git a/app/routes.js b/app/routes.js
index 21e1e7f..838dae8 100644
--- a/app/routes.js
+++ b/app/routes.js
@@ -6,9 +6,9 @@ import ConfirmToken from './components/applying/ConfirmToken.vue'
 import TokenDetail from './components/Token.vue'
 import DonateToken from './components/donate/DonateToken.vue'
 import ConfirmDonate from './components/donate/ConfirmDonate.vue'
-import TomoZCondition from './components/applytomo/TomoZCondition.vue'
-import TomoZApplication from './components/applytomo/TomoZApplication.vue'
-import TomoZConfirm from './components/applytomo/TomoZConfirm.vue'
+import VicZCondition from './components/applytomo/VicZCondition.vue'
+import VicZApplication from './components/applytomo/VicZApplication.vue'
+import VicZConfirm from './components/applytomo/VicZConfirm.vue'
 import DepositFee from './components/deposit/DepositFee.vue'
 import DepositConfirm from './components/deposit/DepositConfirm.vue'
 import EditTransactionsFee from './components/edittransactionsfee/EditTransactionsFee.vue'
@@ -34,9 +34,9 @@ const routes = [
     { path: '/token/:address', component: TokenDetail },
     { path: '/donateTxFee', component: DonateToken },
     { path: '/confirmdonate/:address', component: ConfirmDonate, name: 'ConfirmDonate' },
-    { path: '/tomozcondition/:address', component: TomoZCondition },
-    { path: '/tomozapplication/:address', component: TomoZApplication },
-    { path: '/tomozconfirm/:address', component: TomoZConfirm, name: 'TomoZConfirm' },
+    { path: '/viczcondition/:address', component: VicZCondition },
+    { path: '/viczapplication/:address', component: VicZApplication },
+    { path: '/viczconfirm/:address', component: VicZConfirm, name: 'VicZConfirm' },
     { path: '/depositfee/:address', component: DepositFee },
     { path: '/depositconfirm/:address', component: DepositConfirm, name: 'DepositConfirm' },
     { path: '/edittransactionsfee/:address', component: EditTransactionsFee },
diff --git a/config/default.json b/config/default.json
index 26136fa..328eeec 100644
--- a/config/default.json
+++ b/config/default.json
@@ -10,8 +10,8 @@
         "https://swagger.tomochain.com",
         "http://api.etherscan.io"
     ],
-    "tomoscanUrl": "https://tomoscan.io",
-    "tomoscanAPI": "https://scan.tomochain.com",
+    "tomoscanUrl": "https://www.vicscan.xyz",
+    "tomoscanAPI": "https://www.vicscan.xyz",
     "tomowalletUrl": "https://wallet.testnet.tomochain.com",
     "tomorelayerAPI": "https://relayer.testnet.tomochain.com",
     "relayerAuthorityKey": "",
diff --git a/contracts/MyVRC25.sol b/contracts/MyVRC25.sol
new file mode 100644
index 0000000..4bebcbb
--- /dev/null
+++ b/contracts/MyVRC25.sol
@@ -0,0 +1,1175 @@
+
+// File: contracts/VRC25Permit.sol
+
+
+
+pragma solidity >=0.6.2;
+
+// Sources flattened with hardhat v2.12.6 https://hardhat.org
+
+// File contracts/interfaces/IERC165.sol
+
+/**
+ * @dev Interface of the ERC165 standard, as defined in the
+ * https://eips.ethereum.org/EIPS/eip-165[EIP].
+ *
+ * Implementers can declare support of contract interfaces, which can then be
+ * queried by others ({ERC165Checker}).
+ *
+ * For an implementation, see {ERC165}.
+ */
+interface IERC165 {
+    /**
+     * @dev Returns true if this contract implements the interface defined by
+     * `interfaceId`. See the corresponding
+     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
+     * to learn more about how these ids are created.
+     *
+     * This function call must use less than 30 000 gas.
+     */
+    function supportsInterface(bytes4 interfaceId) external view returns (bool);
+}
+
+
+// File contracts/interfaces/IVRC25.sol
+
+/**
+ * @dev Interface of the VRC25 standard as defined in the EIP.
+ */
+interface IVRC25 {
+    /**
+     * @notice Emitted when `value` tokens are moved from one account (`from`) to
+     * another (`to`).
+     *
+     * Note that `value` may be zero.
+     */
+    event Transfer(address indexed from, address indexed to, uint256 value);
+
+    /**
+     * @notice Emitted when the allowance of a `spender` for an `owner` is set by
+     * a call to {approve}. `value` is the new allowance.
+     */
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+
+    /**
+     * @notice Emitted when token is transferred
+     */
+    event Fee(address indexed from, address indexed to, address indexed issuer, uint256 value);
+
+    /**
+     * @notice Returns the number of decimals used to get its user representation.
+     * For example, if `decimals` equals `2`, a balance of `505` tokens should
+     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
+     *
+     * Tokens usually opt for a value of 18, imitating the relationship between
+     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
+     * called.
+     *
+     * NOTE: This information is only used for _display_ purposes: it in
+     * no way affects any of the arithmetic of the contract, including
+     * {IERC20-balanceOf} and {IERC20-transfer}.
+     */
+    function decimals() external view returns (uint8);
+
+    /**
+     * @notice Returns the amount of tokens in existence.
+     */
+    function totalSupply() external view returns (uint256);
+
+    /**
+     * @notice Returns the amount of tokens owned by `account`.
+     */
+    function balanceOf(address who) external view returns (uint256);
+
+    /**
+     * Same address as owner of the token
+     */
+    function issuer() external view returns (address);
+
+    /**
+     * @notice Returns the remaining number of tokens that `spender` will be
+     * allowed to spend on behalf of `owner` through {transferFrom}. This is
+     * zero by default.
+     *
+     * This value changes when {approve} or {transferFrom} are called.
+     */
+    function allowance(address owner, address spender) external view returns (uint256);
+
+    /**
+     * @notice Calculate fee needed to transfer `amount` of tokens.
+     */
+    function estimateFee(uint256 value) external view returns (uint256);
+
+    /**
+     * @notice Moves `amount` tokens from the caller's account to `recipient`.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transfer(address recipient, uint256 value) external returns (bool);
+
+    /**
+     * @notice Sets `amount` as the allowance of `spender` over the caller's tokens.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * IMPORTANT: Beware that changing an allowance with this method brings the risk
+     * that someone may use both the old and the new allowance by unfortunate
+     * transaction ordering. One possible solution to mitigate this race
+     * condition is to first reduce the spender's allowance to 0 and set the
+     * desired value afterwards:
+     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
+     *
+     * Emits an {Approval} event.
+     */
+    function approve(address spender, uint256 value) external returns (bool);
+
+    /**
+     * @notice Moves `amount` tokens from `sender` to `recipient` using the
+     * allowance mechanism. `amount` is then deducted from the caller's
+     * allowance.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transferFrom(address from, address to, uint256 value) external  returns (bool);
+}
+
+
+// File contracts/libraries/Address.sol
+
+/**
+ * @dev Collection of functions related to the address type
+ */
+library Address {
+    /**
+     * @dev Returns true if `account` is a contract.
+     *
+     * [IMPORTANT]
+     * ====
+     * It is unsafe to assume that an address for which this function returns
+     * false is an externally-owned account (EOA) and not a contract.
+     *
+     * Among others, `isContract` will return false for the following
+     * types of addresses:
+     *
+     *  - an externally-owned account
+     *  - a contract in construction
+     *  - an address where a contract will be created
+     *  - an address where a contract lived, but was destroyed
+     * ====
+     */
+    function isContract(address account) internal view returns (bool) {
+        // This method relies on extcodesize, which returns 0 for contracts in
+        // construction, since the code is only stored at the end of the
+        // constructor execution.
+
+        uint256 size;
+        // solhint-disable-next-line no-inline-assembly
+        assembly { size := extcodesize(account) }
+        return size > 0;
+    }
+
+    /**
+     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
+     * `recipient`, forwarding all available gas and reverting on errors.
+     *
+     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
+     * of certain opcodes, possibly making contracts go over the 2300 gas limit
+     * imposed by `transfer`, making them unable to receive funds via
+     * `transfer`. {sendValue} removes this limitation.
+     *
+     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
+     *
+     * IMPORTANT: because control is transferred to `recipient`, care must be
+     * taken to not create reentrancy vulnerabilities. Consider using
+     * {ReentrancyGuard} or the
+     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
+     */
+    function sendValue(address payable recipient, uint256 amount) internal {
+        require(address(this).balance >= amount, "Address: insufficient balance");
+
+        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
+        (bool success, ) = recipient.call{ value: amount }("");
+        require(success, "Address: unable to send value, recipient may have reverted");
+    }
+
+    /**
+     * @dev Performs a Solidity function call using a low level `call`. A
+     * plain`call` is an unsafe replacement for a function call: use this
+     * function instead.
+     *
+     * If `target` reverts with a revert reason, it is bubbled up by this
+     * function (like regular Solidity function calls).
+     *
+     * Returns the raw returned data. To convert to the expected return value,
+     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
+     *
+     * Requirements:
+     *
+     * - `target` must be a contract.
+     * - calling `target` with `data` must not revert.
+     *
+     * _Available since v3.1._
+     */
+    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
+      return functionCall(target, data, "Address: low-level call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
+     * `errorMessage` as a fallback revert reason when `target` reverts.
+     *
+     * _Available since v3.1._
+     */
+    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, 0, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but also transferring `value` wei to `target`.
+     *
+     * Requirements:
+     *
+     * - the calling contract must have an ETH balance of at least `value`.
+     * - the called Solidity function must be `payable`.
+     *
+     * _Available since v3.1._
+     */
+    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
+     * with `errorMessage` as a fallback revert reason when `target` reverts.
+     *
+     * _Available since v3.1._
+     */
+    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
+        require(address(this).balance >= value, "Address: insufficient balance for call");
+        require(isContract(target), "Address: call to non-contract");
+
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool success, bytes memory returndata) = target.call{ value: value }(data);
+        return _verifyCallResult(success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but performing a static call.
+     *
+     * _Available since v3.3._
+     */
+    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
+        return functionStaticCall(target, data, "Address: low-level static call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
+     * but performing a static call.
+     *
+     * _Available since v3.3._
+     */
+    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
+        require(isContract(target), "Address: static call to non-contract");
+
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool success, bytes memory returndata) = target.staticcall(data);
+        return _verifyCallResult(success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but performing a delegate call.
+     *
+     * _Available since v3.4._
+     */
+    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
+        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
+     * but performing a delegate call.
+     *
+     * _Available since v3.4._
+     */
+    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
+        require(isContract(target), "Address: delegate call to non-contract");
+
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool success, bytes memory returndata) = target.delegatecall(data);
+        return _verifyCallResult(success, returndata, errorMessage);
+    }
+
+    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
+        if (success) {
+            return returndata;
+        } else {
+            // Look for revert reason and bubble it up if present
+            if (returndata.length > 0) {
+                // The easiest way to bubble the revert reason is using memory via assembly
+
+                // solhint-disable-next-line no-inline-assembly
+                assembly {
+                    let returndata_size := mload(returndata)
+                    revert(add(32, returndata), returndata_size)
+                }
+            } else {
+                revert(errorMessage);
+            }
+        }
+    }
+}
+
+
+// File contracts/libraries/SafeMath.sol
+
+/**
+ * @dev Wrappers over Solidity's arithmetic operations with added overflow
+ * checks.
+ *
+ * Arithmetic operations in Solidity wrap on overflow. This can easily result
+ * in bugs, because programmers usually assume that an overflow raises an
+ * error, which is the standard behavior in high level programming languages.
+ * `SafeMath` restores this intuition by reverting the transaction when an
+ * operation overflows.
+ *
+ * Using this library instead of the unchecked operations eliminates an entire
+ * class of bugs, so it's recommended to use it always.
+ */
+library SafeMath {
+    /**
+     * @dev Returns the addition of two unsigned integers, with an overflow flag.
+     *
+     * _Available since v3.4._
+     */
+    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        uint256 c = a + b;
+        if (c < a) return (false, 0);
+        return (true, c);
+    }
+
+    /**
+     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
+     *
+     * _Available since v3.4._
+     */
+    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        if (b > a) return (false, 0);
+        return (true, a - b);
+    }
+
+    /**
+     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
+     *
+     * _Available since v3.4._
+     */
+    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
+        // benefit is lost if 'b' is also tested.
+        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
+        if (a == 0) return (true, 0);
+        uint256 c = a * b;
+        if (c / a != b) return (false, 0);
+        return (true, c);
+    }
+
+    /**
+     * @dev Returns the division of two unsigned integers, with a division by zero flag.
+     *
+     * _Available since v3.4._
+     */
+    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        if (b == 0) return (false, 0);
+        return (true, a / b);
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
+     *
+     * _Available since v3.4._
+     */
+    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        if (b == 0) return (false, 0);
+        return (true, a % b);
+    }
+
+    /**
+     * @dev Returns the addition of two unsigned integers, reverting on
+     * overflow.
+     *
+     * Counterpart to Solidity's `+` operator.
+     *
+     * Requirements:
+     *
+     * - Addition cannot overflow.
+     */
+    function add(uint256 a, uint256 b) internal pure returns (uint256) {
+        uint256 c = a + b;
+        require(c >= a, "SafeMath: addition overflow");
+        return c;
+    }
+
+    /**
+     * @dev Returns the subtraction of two unsigned integers, reverting on
+     * overflow (when the result is negative).
+     *
+     * Counterpart to Solidity's `-` operator.
+     *
+     * Requirements:
+     *
+     * - Subtraction cannot overflow.
+     */
+    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
+        require(b <= a, "SafeMath: subtraction overflow");
+        return a - b;
+    }
+
+    /**
+     * @dev Returns the multiplication of two unsigned integers, reverting on
+     * overflow.
+     *
+     * Counterpart to Solidity's `*` operator.
+     *
+     * Requirements:
+     *
+     * - Multiplication cannot overflow.
+     */
+    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
+        if (a == 0) return 0;
+        uint256 c = a * b;
+        require(c / a == b, "SafeMath: multiplication overflow");
+        return c;
+    }
+
+    /**
+     * @dev Returns the integer division of two unsigned integers, reverting on
+     * division by zero. The result is rounded towards zero.
+     *
+     * Counterpart to Solidity's `/` operator. Note: this function uses a
+     * `revert` opcode (which leaves remaining gas untouched) while Solidity
+     * uses an invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     *
+     * - The divisor cannot be zero.
+     */
+    function div(uint256 a, uint256 b) internal pure returns (uint256) {
+        require(b > 0, "SafeMath: division by zero");
+        return a / b;
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
+     * reverting when dividing by zero.
+     *
+     * Counterpart to Solidity's `%` operator. This function uses a `revert`
+     * opcode (which leaves remaining gas untouched) while Solidity uses an
+     * invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     *
+     * - The divisor cannot be zero.
+     */
+    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
+        require(b > 0, "SafeMath: modulo by zero");
+        return a % b;
+    }
+
+    /**
+     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
+     * overflow (when the result is negative).
+     *
+     * CAUTION: This function is deprecated because it requires allocating memory for the error
+     * message unnecessarily. For custom revert reasons use {trySub}.
+     *
+     * Counterpart to Solidity's `-` operator.
+     *
+     * Requirements:
+     *
+     * - Subtraction cannot overflow.
+     */
+    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        require(b <= a, errorMessage);
+        return a - b;
+    }
+
+    /**
+     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
+     * division by zero. The result is rounded towards zero.
+     *
+     * CAUTION: This function is deprecated because it requires allocating memory for the error
+     * message unnecessarily. For custom revert reasons use {tryDiv}.
+     *
+     * Counterpart to Solidity's `/` operator. Note: this function uses a
+     * `revert` opcode (which leaves remaining gas untouched) while Solidity
+     * uses an invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     *
+     * - The divisor cannot be zero.
+     */
+    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        require(b > 0, errorMessage);
+        return a / b;
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
+     * reverting with custom message when dividing by zero.
+     *
+     * CAUTION: This function is deprecated because it requires allocating memory for the error
+     * message unnecessarily. For custom revert reasons use {tryMod}.
+     *
+     * Counterpart to Solidity's `%` operator. This function uses a `revert`
+     * opcode (which leaves remaining gas untouched) while Solidity uses an
+     * invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     *
+     * - The divisor cannot be zero.
+     */
+    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        require(b > 0, errorMessage);
+        return a % b;
+    }
+}
+
+
+// File contracts/VRC25.sol
+
+/**
+ * @title Base VRC25 implementation
+ * @notice VRC25 implementation for opt-in to gas sponsor program. This replace Ownable from OpenZeppelin as well.
+ */
+abstract contract VRC25 is IVRC25, IERC165 {
+    using Address for address;
+    using SafeMath for uint256;
+
+    // The order of _balances, _minFeem, _issuer must not be changed to pass validation of gas sponsor application
+    mapping (address => uint256) private _balances;
+    uint256 private _minFee;
+    address private _owner;
+    address private _newOwner;
+
+    mapping (address => mapping (address => uint256)) private _allowances;
+
+    string private _name;
+    string private _symbol;
+    uint8 private _decimals;
+    uint256 private _totalSupply;
+
+    event FeeUpdated(uint256 fee);
+    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
+
+    constructor(string memory name, string memory symbol, uint8 decimals_) internal {
+        _name = name;
+        _symbol = symbol;
+        _decimals = decimals_;
+        _owner = msg.sender;
+    }
+
+    /**
+     * @dev Throws if called by any account other than the owner.
+     */
+    modifier onlyOwner() {
+        require(_owner == msg.sender, "VRC25: caller is not the owner");
+        _;
+    }
+
+    /**
+     * @notice Name of token
+     */
+    function name() public view returns (string memory) {
+        return _name;
+    }
+
+    /**
+     * @notice Symbol of token
+     */
+    function symbol() public view returns (string memory) {
+        return _symbol;
+    }
+
+    /**
+     * @notice Returns the number of decimals used to get its user representation.
+     * For example, if `decimals` equals `2`, a balance of `505` tokens should
+     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
+     */
+    function decimals() public view override returns (uint8) {
+        return _decimals;
+    }
+
+    /**
+     * @notice Returns the amount of tokens in existence.
+     */
+    function totalSupply() public view override returns (uint256) {
+        return _totalSupply;
+    }
+
+    /**
+     * @notice Returns the amount of tokens owned by `account`.
+     * @param owner The address to query the balance of.
+     * @return An uint256 representing the amount owned by the passed address.
+     */
+    function balanceOf(address owner) public view override returns (uint256) {
+        return _balances[owner];
+    }
+
+    /**
+     * @notice Returns the remaining number of tokens that `spender` will be
+     * allowed to spend on behalf of `owner` through {transferFrom}. This is
+     * zero by default.
+     *
+     * This value changes when {approve} or {transferFrom} are called.
+     */
+    function allowance(address owner,address spender) public view override returns (uint256){
+        return _allowances[owner][spender];
+    }
+
+    /**
+     * @notice Owner of the token
+     */
+    function owner() public view returns (address) {
+        return _owner;
+    }
+
+    /**
+     * @notice Owner of the token
+     */
+    function issuer() public view override returns (address) {
+        return _owner;
+    }
+
+    /**
+     * @dev The amount fee that will be lost when transferring.
+     */
+    function minFee() public view returns (uint256) {
+        return _minFee;
+    }
+
+    /**
+     * @notice Calculate fee needed to transfer `amount` of tokens.
+     */
+    function estimateFee(uint256 value) public view override returns (uint256) {
+        if (address(msg.sender).isContract()) {
+            return 0;
+        } else {
+            return _estimateFee(value);
+        }
+    }
+
+    /**
+     * @notice Moves `amount` tokens from the caller's account to `recipient`.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transfer(address recipient, uint256 amount) external override returns (bool) {
+        uint256 fee = estimateFee(amount);
+        _transfer(msg.sender, recipient, amount);
+        _chargeFeeFrom(msg.sender, recipient, fee);
+        return true;
+    }
+
+    /**
+     * @notice Sets `amount` as the allowance of `spender` over the caller's tokens.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * IMPORTANT: Beware that changing an allowance with this method brings the risk
+     * that someone may use both the old and the new allowance by unfortunate
+     * transaction ordering. One possible solution to mitigate this race
+     * condition is to first reduce the spender's allowance to 0 and set the
+     * desired value afterwards:
+     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
+     *
+     * Emits an {Approval} event.
+     */
+    function approve(address spender, uint256 amount) external override returns (bool) {
+        uint256 fee = estimateFee(0);
+        _approve(msg.sender, spender, amount);
+        _chargeFeeFrom(msg.sender, address(this), fee);
+        return true;
+    }
+
+    /**
+     * @notice Moves `amount` tokens from `sender` to `recipient` using the
+     * allowance mechanism. `amount` is then deducted from the caller's
+     * allowance.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
+        uint256 fee = estimateFee(amount);
+        require(_allowances[sender][msg.sender] >= amount.add(fee), "VRC25: amount exeeds allowance");
+
+        _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount).sub(fee);
+        _transfer(sender, recipient, amount);
+        _chargeFeeFrom(sender, recipient, fee);
+        return true;
+    }
+
+    /**
+     * @notice Remove `amount` tokens owned by caller from circulation.
+     */
+    function burn(uint256 amount) external returns (bool) {
+        uint256 fee = estimateFee(0);
+        _burn(msg.sender, amount);
+        _chargeFeeFrom(msg.sender, address(this), fee);
+        return true;
+    }
+
+    /**
+     * @dev Accept the ownership transfer. This is to make sure that the contract is
+     * transferred to a working address
+     *
+     * Can only be called by the newly transfered owner.
+     */
+    function acceptOwnership() external {
+        require(msg.sender == _newOwner, "VRC25: only new owner can accept ownership");
+        address oldOwner = _owner;
+        _owner = _newOwner;
+        _newOwner = address(0);
+        emit OwnershipTransferred(oldOwner, _owner);
+    }
+
+    /**
+     * @dev Transfers ownership of the contract to a new account (`newOwner`).
+     *
+     * Can only be called by the current owner.
+     */
+    function transferOwnership(address newOwner) external virtual onlyOwner {
+        require(newOwner != address(0), "VRC25: new owner is the zero address");
+        _newOwner = newOwner;
+    }
+
+    /**
+     * @notice Set minimum fee for each transaction
+     *
+     * Can only be called by the current owner.
+     */
+    function setFee(uint256 fee) external virtual onlyOwner {
+        _minFee = fee;
+        emit FeeUpdated(fee);
+    }
+
+    /**
+     * @dev Returns true if this contract implements the interface defined by
+     * `interfaceId`. See the corresponding
+     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
+     * to learn more about how these ids are created.
+     *
+     */
+    function supportsInterface(bytes4 interfaceId) public view override virtual returns (bool) {
+        return interfaceId == type(IVRC25).interfaceId;
+    }
+
+    /**
+     * @notice Calculate fee needed to transfer `amount` of tokens.
+     */
+    function _estimateFee(uint256 value) internal view virtual returns (uint256);
+
+    /**
+     * @dev Transfer token for a specified addresses
+     * @param from The address to transfer from.
+     * @param to The address to transfer to.
+     * @param amount The amount to be transferred.
+     */
+    function _transfer(address from, address to, uint256 amount) internal {
+        require(from != address(0), "VRC25: transfer from the zero address");
+        require(to != address(0), "VRC25: transfer to the zero address");
+        require(amount <= _balances[from], "VRC25: insuffient balance");
+        _balances[from] = _balances[from].sub(amount);
+        _balances[to] = _balances[to].add(amount);
+        emit Transfer(from, to, amount);
+    }
+
+    /**
+     * @dev Set allowance that spender can use from owner
+     * @param owner The address that authroize the allowance
+     * @param spender The address that can spend the allowance
+     * @param amount The amount that can be allowed
+     */
+    function _approve(address owner, address spender, uint256 amount) internal {
+        require(owner != address(0), "VRC25: approve from the zero address");
+        require(spender != address(0), "VRC25: approve to the zero address");
+
+        _allowances[owner][spender] = amount;
+        emit Approval(owner, spender, amount);
+    }
+
+    /**
+     * @dev Internal function to charge fee for gas sponsor function. Won't charge fee if caller is smart-contract because they are not sponsored gas.
+     * NOTICE: this function is only a helper to transfer fee from an address different that msg.sender. Other validation should be handled outside of this function if necessary.
+     * @param sender The address that will pay the fee
+     * @param recipient The address that is destination of token transfer. If not token transfer should be address of contract
+     * @param amount The amount token as fee
+     */
+    function _chargeFeeFrom(address sender, address recipient, uint256 amount) internal {
+        if (address(msg.sender).isContract()) {
+            return;
+        }
+        if(amount > 0) {
+            _transfer(sender, _owner, amount);
+            emit Fee(sender, recipient, _owner, amount);
+        }
+    }
+    /**
+     * @dev Internal function that mints an amount of the token and assigns it to
+     * an account. This encapsulates the modification of balances such that the
+     * proper events are emitted.
+     * @param to The account that will receive the created tokens.
+     * @param amount The amount that will be created.
+     */
+    function _mint(address to, uint256 amount) internal {
+        require(to != address(0), "VRC25: mint to the zero address");
+        _totalSupply = _totalSupply.add(amount);
+        _balances[to] = _balances[to].add(amount);
+        emit Transfer(address(0), to, amount);
+    }
+
+    /**
+     * @dev Internal function that burns an amount of the token
+     * This encapsulates the modification of balances such that the
+     * proper events are emitted.
+     * @param from The account that token amount will be deducted.
+     * @param amount The amount that will be burned.
+     */
+    function _burn(address from, uint256 amount) internal {
+        require(from != address(0), "VRC25: burn from the zero address");
+        require(amount <= _balances[from], "VRC25: insuffient balance");
+        _totalSupply = _totalSupply.sub(amount);
+        _balances[from] = _balances[from].sub(amount);
+        emit Transfer(from, address(0), amount);
+    }
+}
+
+
+// File contracts/interfaces/IVRC25Permit.sol
+
+/**
+ * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
+ * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
+ *
+ * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
+ * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
+ * need to send a transaction, and thus is not required to hold Ether at all.
+ */
+interface IVRC25Permit {
+    /**
+     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
+     */
+    // solhint-disable-next-line func-name-mixedcase
+    function DOMAIN_SEPARATOR() external view returns (bytes32);
+
+    /**
+     * @dev Returns the current nonce for `owner`. This value must be
+     * included whenever a signature is generated for {permit}.
+     *
+     * Every successful call to {permit} increases ``owner``'s nonce by one. This
+     * prevents a signature from being used multiple times.
+     */
+    function nonces(address owner) external view returns (uint256);
+
+    /**
+     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
+     * given ``owner``'s signed approval.
+     *
+     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
+     * ordering also apply here.
+     *
+     * Emits an {Approval} event.
+     *
+     * Requirements:
+     *
+     * - `spender` cannot be the zero address.
+     * - `deadline` must be a timestamp in the future.
+     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
+     * over the EIP712-formatted function arguments.
+     * - the signature must use ``owner``'s current nonce (see {nonces}).
+     *
+     * For more information on the signature format, see the
+     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
+     * section].
+     */
+    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
+}
+
+
+// File contracts/libraries/ECDSA.sol
+
+/**
+ * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
+ *
+ * These functions can be used to verify that a message was signed by the holder
+ * of the private keys of a given address.
+ */
+library ECDSA {
+    /**
+     * @dev Returns the address that signed a hashed message (`hash`) with
+     * `signature`. This address can then be used for verification purposes.
+     *
+     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
+     * this function rejects them by requiring the `s` value to be in the lower
+     * half order, and the `v` value to be either 27 or 28.
+     *
+     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
+     * verification to be secure: it is possible to craft signatures that
+     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
+     * this is by receiving a hash of the original message (which may otherwise
+     * be too long), and then calling {toEthSignedMessageHash} on it.
+     */
+    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
+        // Check the signature length
+        if (signature.length != 65) {
+            revert("ECDSA: invalid signature length");
+        }
+
+        // Divide the signature in r, s and v variables
+        bytes32 r;
+        bytes32 s;
+        uint8 v;
+
+        // ecrecover takes the signature parameters, and the only way to get them
+        // currently is to use assembly.
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            r := mload(add(signature, 0x20))
+            s := mload(add(signature, 0x40))
+            v := byte(0, mload(add(signature, 0x60)))
+        }
+
+        return recover(hash, v, r, s);
+    }
+
+    /**
+     * @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`,
+     * `r` and `s` signature fields separately.
+     */
+    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
+        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
+        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
+        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
+        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
+        //
+        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
+        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
+        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
+        // these malleable signatures as well.
+        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
+        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");
+
+        // If the signature is valid (and not malleable), return the signer address
+        address signer = ecrecover(hash, v, r, s);
+        require(signer != address(0), "ECDSA: invalid signature");
+
+        return signer;
+    }
+
+    /**
+     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
+     * replicates the behavior of the
+     * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]
+     * JSON-RPC method.
+     *
+     * See {recover}.
+     */
+    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
+        // 32 is the length in bytes of hash,
+        // enforced by the type signature above
+        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
+    }
+}
+
+
+// File contracts/libraries/EIP712.sol
+
+/**
+ * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
+ *
+ * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
+ * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
+ * they need in their contracts using a combination of `abi.encode` and `keccak256`.
+ *
+ * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
+ * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
+ * ({_hashTypedDataV4}).
+ *
+ * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
+ * the chain id to protect against replay attacks on an eventual fork of the chain.
+ *
+ * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
+ * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
+ *
+ * _Available since v3.4._
+ */
+abstract contract EIP712 {
+    /* solhint-disable var-name-mixedcase */
+    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
+    // invalidate the cached domain separator if the chain id changes.
+    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
+    uint256 private immutable _CACHED_CHAIN_ID;
+    address private immutable _CACHED_THIS;
+
+    bytes32 private immutable _HASHED_NAME;
+    bytes32 private immutable _HASHED_VERSION;
+    bytes32 private immutable _TYPE_HASH;
+
+    /* solhint-enable var-name-mixedcase */
+
+    /**
+     * @dev Initializes the domain separator and parameter caches.
+     *
+     * The meaning of `name` and `version` is specified in
+     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
+     *
+     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
+     * - `version`: the current major version of the signing domain.
+     *
+     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
+     * contract upgrade].
+     */
+    constructor(string memory name, string memory version) internal {
+        bytes32 hashedName = keccak256(bytes(name));
+        bytes32 hashedVersion = keccak256(bytes(version));
+        bytes32 typeHash = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
+        _HASHED_NAME = hashedName;
+        _HASHED_VERSION = hashedVersion;
+        _CACHED_CHAIN_ID = _getChainId();
+        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
+        _CACHED_THIS = address(this);
+        _TYPE_HASH = typeHash;
+    }
+
+    /**
+     * @dev Returns the domain separator for the current chain.
+     */
+    function _domainSeparatorV4() internal view returns (bytes32) {
+        if (address(this) == _CACHED_THIS && _getChainId() == _CACHED_CHAIN_ID) {
+            return _CACHED_DOMAIN_SEPARATOR;
+        } else {
+            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
+        }
+    }
+
+    function _buildDomainSeparator(bytes32 typeHash, bytes32 nameHash, bytes32 versionHash) private view returns (bytes32) {
+        return keccak256(abi.encode(typeHash, nameHash, versionHash, _getChainId(), address(this)));
+    }
+
+    /**
+     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
+     * function returns the hash of the fully encoded EIP712 message for this domain.
+     *
+     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
+     *
+     * ```solidity
+     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
+     *     keccak256("Mail(address to,string contents)"),
+     *     mailTo,
+     *     keccak256(bytes(mailContents))
+     * )));
+     * address signer = ECDSA.recover(digest, signature);
+     * ```
+     */
+    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
+        return keccak256(abi.encodePacked("\x19\x01", _domainSeparatorV4(), structHash));
+    }
+
+    function _getChainId() private view returns (uint256 chainId) {
+        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            chainId := chainid()
+        }
+    }
+}
+
+
+// File contracts/VRC25Permit.sol
+
+abstract contract VRC25Permit is VRC25, EIP712, IVRC25Permit {
+    bytes32 private constant PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
+
+    mapping(address => uint256) private _nonces;
+
+    constructor() EIP712("VRC25", "1") { }
+
+    /**
+     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
+     */
+    // solhint-disable-next-line func-name-mixedcase
+    function DOMAIN_SEPARATOR() external override view returns (bytes32) {
+        return _domainSeparatorV4();
+    }
+
+    /**
+     * @dev Returns an the next unused nonce for an address.
+     */
+    function nonces(address owner) public view virtual override(IVRC25Permit) returns (uint256) {
+        return _nonces[owner];
+    }
+
+    /**
+     * @dev See {IERC20Permit-permit}.
+     */
+    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external override {
+        require(block.timestamp <= deadline, "VRC25: Permit expired");
+
+        bytes32 structHash = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));
+        bytes32 hash = _hashTypedDataV4(structHash);
+        address signer = ECDSA.recover(hash, v, r, s);
+        require(signer == owner, "VRC25: Invalid permit");
+
+        uint256 fee = estimateFee(0);
+        _approve(owner, spender, value);
+        _chargeFeeFrom(owner, address(this), fee);
+    }
+
+    /**
+     * @dev Consumes a nonce.
+     *
+     * Returns the current value and increments nonce.
+     */
+    function _useNonce(address owner) internal returns (uint256) {
+        // For each account, the nonce has an initial value of 0, can only be incremented by one, and cannot be
+        // decremented or reset. This guarantees that the nonce never overflows.
+        // It is important to do x++ and not ++x here.
+        return _nonces[owner]++;
+    }
+}
+
+// File: contracts/MyVRC25.sol
+
+
+pragma solidity >=0.6.2;
+
+
+contract MyVRC25 is VRC25Permit {
+    using Address for address;
+
+    constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _initialSupply) VRC25(_name, _symbol, _decimals) {
+        _mint(msg.sender, _initialSupply);
+    }
+
+    /**
+     * @notice Calculate fee required for action related to this token
+     * @param value Amount of fee
+     */
+    function _estimateFee(uint256 value) internal view override returns (uint256) {
+        return value + minFee();
+    }
+
+
+    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
+        return interfaceId == type(IVRC25).interfaceId || super.supportsInterface(interfaceId);
+    }
+}
\ No newline at end of file
diff --git a/contracts/MyVRC25Mintable.sol b/contracts/MyVRC25Mintable.sol
new file mode 100644
index 0000000..bd99ad5
--- /dev/null
+++ b/contracts/MyVRC25Mintable.sol
@@ -0,0 +1,1185 @@
+
+// File: contracts/VRC25Permit.sol
+
+
+
+pragma solidity >=0.6.2;
+
+// Sources flattened with hardhat v2.12.6 https://hardhat.org
+
+// File contracts/interfaces/IERC165.sol
+
+/**
+ * @dev Interface of the ERC165 standard, as defined in the
+ * https://eips.ethereum.org/EIPS/eip-165[EIP].
+ *
+ * Implementers can declare support of contract interfaces, which can then be
+ * queried by others ({ERC165Checker}).
+ *
+ * For an implementation, see {ERC165}.
+ */
+interface IERC165 {
+    /**
+     * @dev Returns true if this contract implements the interface defined by
+     * `interfaceId`. See the corresponding
+     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
+     * to learn more about how these ids are created.
+     *
+     * This function call must use less than 30 000 gas.
+     */
+    function supportsInterface(bytes4 interfaceId) external view returns (bool);
+}
+
+
+// File contracts/interfaces/IVRC25.sol
+
+/**
+ * @dev Interface of the VRC25 standard as defined in the EIP.
+ */
+interface IVRC25 {
+    /**
+     * @notice Emitted when `value` tokens are moved from one account (`from`) to
+     * another (`to`).
+     *
+     * Note that `value` may be zero.
+     */
+    event Transfer(address indexed from, address indexed to, uint256 value);
+
+    /**
+     * @notice Emitted when the allowance of a `spender` for an `owner` is set by
+     * a call to {approve}. `value` is the new allowance.
+     */
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+
+    /**
+     * @notice Emitted when token is transferred
+     */
+    event Fee(address indexed from, address indexed to, address indexed issuer, uint256 value);
+
+    /**
+     * @notice Returns the number of decimals used to get its user representation.
+     * For example, if `decimals` equals `2`, a balance of `505` tokens should
+     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
+     *
+     * Tokens usually opt for a value of 18, imitating the relationship between
+     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
+     * called.
+     *
+     * NOTE: This information is only used for _display_ purposes: it in
+     * no way affects any of the arithmetic of the contract, including
+     * {IERC20-balanceOf} and {IERC20-transfer}.
+     */
+    function decimals() external view returns (uint8);
+
+    /**
+     * @notice Returns the amount of tokens in existence.
+     */
+    function totalSupply() external view returns (uint256);
+
+    /**
+     * @notice Returns the amount of tokens owned by `account`.
+     */
+    function balanceOf(address who) external view returns (uint256);
+
+    /**
+     * Same address as owner of the token
+     */
+    function issuer() external view returns (address);
+
+    /**
+     * @notice Returns the remaining number of tokens that `spender` will be
+     * allowed to spend on behalf of `owner` through {transferFrom}. This is
+     * zero by default.
+     *
+     * This value changes when {approve} or {transferFrom} are called.
+     */
+    function allowance(address owner, address spender) external view returns (uint256);
+
+    /**
+     * @notice Calculate fee needed to transfer `amount` of tokens.
+     */
+    function estimateFee(uint256 value) external view returns (uint256);
+
+    /**
+     * @notice Moves `amount` tokens from the caller's account to `recipient`.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transfer(address recipient, uint256 value) external returns (bool);
+
+    /**
+     * @notice Sets `amount` as the allowance of `spender` over the caller's tokens.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * IMPORTANT: Beware that changing an allowance with this method brings the risk
+     * that someone may use both the old and the new allowance by unfortunate
+     * transaction ordering. One possible solution to mitigate this race
+     * condition is to first reduce the spender's allowance to 0 and set the
+     * desired value afterwards:
+     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
+     *
+     * Emits an {Approval} event.
+     */
+    function approve(address spender, uint256 value) external returns (bool);
+
+    /**
+     * @notice Moves `amount` tokens from `sender` to `recipient` using the
+     * allowance mechanism. `amount` is then deducted from the caller's
+     * allowance.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transferFrom(address from, address to, uint256 value) external  returns (bool);
+}
+
+
+// File contracts/libraries/Address.sol
+
+/**
+ * @dev Collection of functions related to the address type
+ */
+library Address {
+    /**
+     * @dev Returns true if `account` is a contract.
+     *
+     * [IMPORTANT]
+     * ====
+     * It is unsafe to assume that an address for which this function returns
+     * false is an externally-owned account (EOA) and not a contract.
+     *
+     * Among others, `isContract` will return false for the following
+     * types of addresses:
+     *
+     *  - an externally-owned account
+     *  - a contract in construction
+     *  - an address where a contract will be created
+     *  - an address where a contract lived, but was destroyed
+     * ====
+     */
+    function isContract(address account) internal view returns (bool) {
+        // This method relies on extcodesize, which returns 0 for contracts in
+        // construction, since the code is only stored at the end of the
+        // constructor execution.
+
+        uint256 size;
+        // solhint-disable-next-line no-inline-assembly
+        assembly { size := extcodesize(account) }
+        return size > 0;
+    }
+
+    /**
+     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
+     * `recipient`, forwarding all available gas and reverting on errors.
+     *
+     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
+     * of certain opcodes, possibly making contracts go over the 2300 gas limit
+     * imposed by `transfer`, making them unable to receive funds via
+     * `transfer`. {sendValue} removes this limitation.
+     *
+     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
+     *
+     * IMPORTANT: because control is transferred to `recipient`, care must be
+     * taken to not create reentrancy vulnerabilities. Consider using
+     * {ReentrancyGuard} or the
+     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
+     */
+    function sendValue(address payable recipient, uint256 amount) internal {
+        require(address(this).balance >= amount, "Address: insufficient balance");
+
+        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
+        (bool success, ) = recipient.call{ value: amount }("");
+        require(success, "Address: unable to send value, recipient may have reverted");
+    }
+
+    /**
+     * @dev Performs a Solidity function call using a low level `call`. A
+     * plain`call` is an unsafe replacement for a function call: use this
+     * function instead.
+     *
+     * If `target` reverts with a revert reason, it is bubbled up by this
+     * function (like regular Solidity function calls).
+     *
+     * Returns the raw returned data. To convert to the expected return value,
+     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
+     *
+     * Requirements:
+     *
+     * - `target` must be a contract.
+     * - calling `target` with `data` must not revert.
+     *
+     * _Available since v3.1._
+     */
+    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
+      return functionCall(target, data, "Address: low-level call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
+     * `errorMessage` as a fallback revert reason when `target` reverts.
+     *
+     * _Available since v3.1._
+     */
+    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, 0, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but also transferring `value` wei to `target`.
+     *
+     * Requirements:
+     *
+     * - the calling contract must have an ETH balance of at least `value`.
+     * - the called Solidity function must be `payable`.
+     *
+     * _Available since v3.1._
+     */
+    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
+        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
+     * with `errorMessage` as a fallback revert reason when `target` reverts.
+     *
+     * _Available since v3.1._
+     */
+    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
+        require(address(this).balance >= value, "Address: insufficient balance for call");
+        require(isContract(target), "Address: call to non-contract");
+
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool success, bytes memory returndata) = target.call{ value: value }(data);
+        return _verifyCallResult(success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but performing a static call.
+     *
+     * _Available since v3.3._
+     */
+    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
+        return functionStaticCall(target, data, "Address: low-level static call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
+     * but performing a static call.
+     *
+     * _Available since v3.3._
+     */
+    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
+        require(isContract(target), "Address: static call to non-contract");
+
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool success, bytes memory returndata) = target.staticcall(data);
+        return _verifyCallResult(success, returndata, errorMessage);
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
+     * but performing a delegate call.
+     *
+     * _Available since v3.4._
+     */
+    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
+        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
+    }
+
+    /**
+     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
+     * but performing a delegate call.
+     *
+     * _Available since v3.4._
+     */
+    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
+        require(isContract(target), "Address: delegate call to non-contract");
+
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool success, bytes memory returndata) = target.delegatecall(data);
+        return _verifyCallResult(success, returndata, errorMessage);
+    }
+
+    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
+        if (success) {
+            return returndata;
+        } else {
+            // Look for revert reason and bubble it up if present
+            if (returndata.length > 0) {
+                // The easiest way to bubble the revert reason is using memory via assembly
+
+                // solhint-disable-next-line no-inline-assembly
+                assembly {
+                    let returndata_size := mload(returndata)
+                    revert(add(32, returndata), returndata_size)
+                }
+            } else {
+                revert(errorMessage);
+            }
+        }
+    }
+}
+
+
+// File contracts/libraries/SafeMath.sol
+
+/**
+ * @dev Wrappers over Solidity's arithmetic operations with added overflow
+ * checks.
+ *
+ * Arithmetic operations in Solidity wrap on overflow. This can easily result
+ * in bugs, because programmers usually assume that an overflow raises an
+ * error, which is the standard behavior in high level programming languages.
+ * `SafeMath` restores this intuition by reverting the transaction when an
+ * operation overflows.
+ *
+ * Using this library instead of the unchecked operations eliminates an entire
+ * class of bugs, so it's recommended to use it always.
+ */
+library SafeMath {
+    /**
+     * @dev Returns the addition of two unsigned integers, with an overflow flag.
+     *
+     * _Available since v3.4._
+     */
+    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        uint256 c = a + b;
+        if (c < a) return (false, 0);
+        return (true, c);
+    }
+
+    /**
+     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
+     *
+     * _Available since v3.4._
+     */
+    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        if (b > a) return (false, 0);
+        return (true, a - b);
+    }
+
+    /**
+     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
+     *
+     * _Available since v3.4._
+     */
+    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
+        // benefit is lost if 'b' is also tested.
+        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
+        if (a == 0) return (true, 0);
+        uint256 c = a * b;
+        if (c / a != b) return (false, 0);
+        return (true, c);
+    }
+
+    /**
+     * @dev Returns the division of two unsigned integers, with a division by zero flag.
+     *
+     * _Available since v3.4._
+     */
+    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        if (b == 0) return (false, 0);
+        return (true, a / b);
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
+     *
+     * _Available since v3.4._
+     */
+    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
+        if (b == 0) return (false, 0);
+        return (true, a % b);
+    }
+
+    /**
+     * @dev Returns the addition of two unsigned integers, reverting on
+     * overflow.
+     *
+     * Counterpart to Solidity's `+` operator.
+     *
+     * Requirements:
+     *
+     * - Addition cannot overflow.
+     */
+    function add(uint256 a, uint256 b) internal pure returns (uint256) {
+        uint256 c = a + b;
+        require(c >= a, "SafeMath: addition overflow");
+        return c;
+    }
+
+    /**
+     * @dev Returns the subtraction of two unsigned integers, reverting on
+     * overflow (when the result is negative).
+     *
+     * Counterpart to Solidity's `-` operator.
+     *
+     * Requirements:
+     *
+     * - Subtraction cannot overflow.
+     */
+    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
+        require(b <= a, "SafeMath: subtraction overflow");
+        return a - b;
+    }
+
+    /**
+     * @dev Returns the multiplication of two unsigned integers, reverting on
+     * overflow.
+     *
+     * Counterpart to Solidity's `*` operator.
+     *
+     * Requirements:
+     *
+     * - Multiplication cannot overflow.
+     */
+    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
+        if (a == 0) return 0;
+        uint256 c = a * b;
+        require(c / a == b, "SafeMath: multiplication overflow");
+        return c;
+    }
+
+    /**
+     * @dev Returns the integer division of two unsigned integers, reverting on
+     * division by zero. The result is rounded towards zero.
+     *
+     * Counterpart to Solidity's `/` operator. Note: this function uses a
+     * `revert` opcode (which leaves remaining gas untouched) while Solidity
+     * uses an invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     *
+     * - The divisor cannot be zero.
+     */
+    function div(uint256 a, uint256 b) internal pure returns (uint256) {
+        require(b > 0, "SafeMath: division by zero");
+        return a / b;
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
+     * reverting when dividing by zero.
+     *
+     * Counterpart to Solidity's `%` operator. This function uses a `revert`
+     * opcode (which leaves remaining gas untouched) while Solidity uses an
+     * invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     *
+     * - The divisor cannot be zero.
+     */
+    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
+        require(b > 0, "SafeMath: modulo by zero");
+        return a % b;
+    }
+
+    /**
+     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
+     * overflow (when the result is negative).
+     *
+     * CAUTION: This function is deprecated because it requires allocating memory for the error
+     * message unnecessarily. For custom revert reasons use {trySub}.
+     *
+     * Counterpart to Solidity's `-` operator.
+     *
+     * Requirements:
+     *
+     * - Subtraction cannot overflow.
+     */
+    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        require(b <= a, errorMessage);
+        return a - b;
+    }
+
+    /**
+     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
+     * division by zero. The result is rounded towards zero.
+     *
+     * CAUTION: This function is deprecated because it requires allocating memory for the error
+     * message unnecessarily. For custom revert reasons use {tryDiv}.
+     *
+     * Counterpart to Solidity's `/` operator. Note: this function uses a
+     * `revert` opcode (which leaves remaining gas untouched) while Solidity
+     * uses an invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     *
+     * - The divisor cannot be zero.
+     */
+    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        require(b > 0, errorMessage);
+        return a / b;
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
+     * reverting with custom message when dividing by zero.
+     *
+     * CAUTION: This function is deprecated because it requires allocating memory for the error
+     * message unnecessarily. For custom revert reasons use {tryMod}.
+     *
+     * Counterpart to Solidity's `%` operator. This function uses a `revert`
+     * opcode (which leaves remaining gas untouched) while Solidity uses an
+     * invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     *
+     * - The divisor cannot be zero.
+     */
+    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        require(b > 0, errorMessage);
+        return a % b;
+    }
+}
+
+
+// File contracts/VRC25.sol
+
+/**
+ * @title Base VRC25 implementation
+ * @notice VRC25 implementation for opt-in to gas sponsor program. This replace Ownable from OpenZeppelin as well.
+ */
+abstract contract VRC25 is IVRC25, IERC165 {
+    using Address for address;
+    using SafeMath for uint256;
+
+    // The order of _balances, _minFeem, _issuer must not be changed to pass validation of gas sponsor application
+    mapping (address => uint256) private _balances;
+    uint256 private _minFee;
+    address private _owner;
+    address private _newOwner;
+
+    mapping (address => mapping (address => uint256)) private _allowances;
+
+    string private _name;
+    string private _symbol;
+    uint8 private _decimals;
+    uint256 private _totalSupply;
+
+    event FeeUpdated(uint256 fee);
+    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
+
+    constructor(string memory name, string memory symbol, uint8 decimals_) internal {
+        _name = name;
+        _symbol = symbol;
+        _decimals = decimals_;
+        _owner = msg.sender;
+    }
+
+    /**
+     * @dev Throws if called by any account other than the owner.
+     */
+    modifier onlyOwner() {
+        require(_owner == msg.sender, "VRC25: caller is not the owner");
+        _;
+    }
+
+    /**
+     * @notice Name of token
+     */
+    function name() public view returns (string memory) {
+        return _name;
+    }
+
+    /**
+     * @notice Symbol of token
+     */
+    function symbol() public view returns (string memory) {
+        return _symbol;
+    }
+
+    /**
+     * @notice Returns the number of decimals used to get its user representation.
+     * For example, if `decimals` equals `2`, a balance of `505` tokens should
+     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
+     */
+    function decimals() public view override returns (uint8) {
+        return _decimals;
+    }
+
+    /**
+     * @notice Returns the amount of tokens in existence.
+     */
+    function totalSupply() public view override returns (uint256) {
+        return _totalSupply;
+    }
+
+    /**
+     * @notice Returns the amount of tokens owned by `account`.
+     * @param owner The address to query the balance of.
+     * @return An uint256 representing the amount owned by the passed address.
+     */
+    function balanceOf(address owner) public view override returns (uint256) {
+        return _balances[owner];
+    }
+
+    /**
+     * @notice Returns the remaining number of tokens that `spender` will be
+     * allowed to spend on behalf of `owner` through {transferFrom}. This is
+     * zero by default.
+     *
+     * This value changes when {approve} or {transferFrom} are called.
+     */
+    function allowance(address owner,address spender) public view override returns (uint256){
+        return _allowances[owner][spender];
+    }
+
+    /**
+     * @notice Owner of the token
+     */
+    function owner() public view returns (address) {
+        return _owner;
+    }
+
+    /**
+     * @notice Owner of the token
+     */
+    function issuer() public view override returns (address) {
+        return _owner;
+    }
+
+    /**
+     * @dev The amount fee that will be lost when transferring.
+     */
+    function minFee() public view returns (uint256) {
+        return _minFee;
+    }
+
+    /**
+     * @notice Calculate fee needed to transfer `amount` of tokens.
+     */
+    function estimateFee(uint256 value) public view override returns (uint256) {
+        if (address(msg.sender).isContract()) {
+            return 0;
+        } else {
+            return _estimateFee(value);
+        }
+    }
+
+    /**
+     * @notice Moves `amount` tokens from the caller's account to `recipient`.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transfer(address recipient, uint256 amount) external override returns (bool) {
+        uint256 fee = estimateFee(amount);
+        _transfer(msg.sender, recipient, amount);
+        _chargeFeeFrom(msg.sender, recipient, fee);
+        return true;
+    }
+
+    /**
+     * @notice Sets `amount` as the allowance of `spender` over the caller's tokens.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * IMPORTANT: Beware that changing an allowance with this method brings the risk
+     * that someone may use both the old and the new allowance by unfortunate
+     * transaction ordering. One possible solution to mitigate this race
+     * condition is to first reduce the spender's allowance to 0 and set the
+     * desired value afterwards:
+     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
+     *
+     * Emits an {Approval} event.
+     */
+    function approve(address spender, uint256 amount) external override returns (bool) {
+        uint256 fee = estimateFee(0);
+        _approve(msg.sender, spender, amount);
+        _chargeFeeFrom(msg.sender, address(this), fee);
+        return true;
+    }
+
+    /**
+     * @notice Moves `amount` tokens from `sender` to `recipient` using the
+     * allowance mechanism. `amount` is then deducted from the caller's
+     * allowance.
+     *
+     * Returns a boolean value indicating whether the operation succeeded.
+     *
+     * Emits a {Transfer} event.
+     */
+    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
+        uint256 fee = estimateFee(amount);
+        require(_allowances[sender][msg.sender] >= amount.add(fee), "VRC25: amount exeeds allowance");
+
+        _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount).sub(fee);
+        _transfer(sender, recipient, amount);
+        _chargeFeeFrom(sender, recipient, fee);
+        return true;
+    }
+
+    /**
+     * @notice Remove `amount` tokens owned by caller from circulation.
+     */
+    function burn(uint256 amount) external returns (bool) {
+        uint256 fee = estimateFee(0);
+        _burn(msg.sender, amount);
+        _chargeFeeFrom(msg.sender, address(this), fee);
+        return true;
+    }
+
+    /**
+     * @dev Accept the ownership transfer. This is to make sure that the contract is
+     * transferred to a working address
+     *
+     * Can only be called by the newly transfered owner.
+     */
+    function acceptOwnership() external {
+        require(msg.sender == _newOwner, "VRC25: only new owner can accept ownership");
+        address oldOwner = _owner;
+        _owner = _newOwner;
+        _newOwner = address(0);
+        emit OwnershipTransferred(oldOwner, _owner);
+    }
+
+    /**
+     * @dev Transfers ownership of the contract to a new account (`newOwner`).
+     *
+     * Can only be called by the current owner.
+     */
+    function transferOwnership(address newOwner) external virtual onlyOwner {
+        require(newOwner != address(0), "VRC25: new owner is the zero address");
+        _newOwner = newOwner;
+    }
+
+    /**
+     * @notice Set minimum fee for each transaction
+     *
+     * Can only be called by the current owner.
+     */
+    function setFee(uint256 fee) external virtual onlyOwner {
+        _minFee = fee;
+        emit FeeUpdated(fee);
+    }
+
+    /**
+     * @dev Returns true if this contract implements the interface defined by
+     * `interfaceId`. See the corresponding
+     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
+     * to learn more about how these ids are created.
+     *
+     */
+    function supportsInterface(bytes4 interfaceId) public view override virtual returns (bool) {
+        return interfaceId == type(IVRC25).interfaceId;
+    }
+
+    /**
+     * @notice Calculate fee needed to transfer `amount` of tokens.
+     */
+    function _estimateFee(uint256 value) internal view virtual returns (uint256);
+
+    /**
+     * @dev Transfer token for a specified addresses
+     * @param from The address to transfer from.
+     * @param to The address to transfer to.
+     * @param amount The amount to be transferred.
+     */
+    function _transfer(address from, address to, uint256 amount) internal {
+        require(from != address(0), "VRC25: transfer from the zero address");
+        require(to != address(0), "VRC25: transfer to the zero address");
+        require(amount <= _balances[from], "VRC25: insuffient balance");
+        _balances[from] = _balances[from].sub(amount);
+        _balances[to] = _balances[to].add(amount);
+        emit Transfer(from, to, amount);
+    }
+
+    /**
+     * @dev Set allowance that spender can use from owner
+     * @param owner The address that authroize the allowance
+     * @param spender The address that can spend the allowance
+     * @param amount The amount that can be allowed
+     */
+    function _approve(address owner, address spender, uint256 amount) internal {
+        require(owner != address(0), "VRC25: approve from the zero address");
+        require(spender != address(0), "VRC25: approve to the zero address");
+
+        _allowances[owner][spender] = amount;
+        emit Approval(owner, spender, amount);
+    }
+
+    /**
+     * @dev Internal function to charge fee for gas sponsor function. Won't charge fee if caller is smart-contract because they are not sponsored gas.
+     * NOTICE: this function is only a helper to transfer fee from an address different that msg.sender. Other validation should be handled outside of this function if necessary.
+     * @param sender The address that will pay the fee
+     * @param recipient The address that is destination of token transfer. If not token transfer should be address of contract
+     * @param amount The amount token as fee
+     */
+    function _chargeFeeFrom(address sender, address recipient, uint256 amount) internal {
+        if (address(msg.sender).isContract()) {
+            return;
+        }
+        if(amount > 0) {
+            _transfer(sender, _owner, amount);
+            emit Fee(sender, recipient, _owner, amount);
+        }
+    }
+    /**
+     * @dev Internal function that mints an amount of the token and assigns it to
+     * an account. This encapsulates the modification of balances such that the
+     * proper events are emitted.
+     * @param to The account that will receive the created tokens.
+     * @param amount The amount that will be created.
+     */
+    function _mint(address to, uint256 amount) internal {
+        require(to != address(0), "VRC25: mint to the zero address");
+        _totalSupply = _totalSupply.add(amount);
+        _balances[to] = _balances[to].add(amount);
+        emit Transfer(address(0), to, amount);
+    }
+
+    /**
+     * @dev Internal function that burns an amount of the token
+     * This encapsulates the modification of balances such that the
+     * proper events are emitted.
+     * @param from The account that token amount will be deducted.
+     * @param amount The amount that will be burned.
+     */
+    function _burn(address from, uint256 amount) internal {
+        require(from != address(0), "VRC25: burn from the zero address");
+        require(amount <= _balances[from], "VRC25: insuffient balance");
+        _totalSupply = _totalSupply.sub(amount);
+        _balances[from] = _balances[from].sub(amount);
+        emit Transfer(from, address(0), amount);
+    }
+}
+
+
+// File contracts/interfaces/IVRC25Permit.sol
+
+/**
+ * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
+ * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
+ *
+ * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
+ * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
+ * need to send a transaction, and thus is not required to hold Ether at all.
+ */
+interface IVRC25Permit {
+    /**
+     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
+     */
+    // solhint-disable-next-line func-name-mixedcase
+    function DOMAIN_SEPARATOR() external view returns (bytes32);
+
+    /**
+     * @dev Returns the current nonce for `owner`. This value must be
+     * included whenever a signature is generated for {permit}.
+     *
+     * Every successful call to {permit} increases ``owner``'s nonce by one. This
+     * prevents a signature from being used multiple times.
+     */
+    function nonces(address owner) external view returns (uint256);
+
+    /**
+     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
+     * given ``owner``'s signed approval.
+     *
+     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
+     * ordering also apply here.
+     *
+     * Emits an {Approval} event.
+     *
+     * Requirements:
+     *
+     * - `spender` cannot be the zero address.
+     * - `deadline` must be a timestamp in the future.
+     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
+     * over the EIP712-formatted function arguments.
+     * - the signature must use ``owner``'s current nonce (see {nonces}).
+     *
+     * For more information on the signature format, see the
+     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
+     * section].
+     */
+    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
+}
+
+
+// File contracts/libraries/ECDSA.sol
+
+/**
+ * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
+ *
+ * These functions can be used to verify that a message was signed by the holder
+ * of the private keys of a given address.
+ */
+library ECDSA {
+    /**
+     * @dev Returns the address that signed a hashed message (`hash`) with
+     * `signature`. This address can then be used for verification purposes.
+     *
+     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
+     * this function rejects them by requiring the `s` value to be in the lower
+     * half order, and the `v` value to be either 27 or 28.
+     *
+     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
+     * verification to be secure: it is possible to craft signatures that
+     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
+     * this is by receiving a hash of the original message (which may otherwise
+     * be too long), and then calling {toEthSignedMessageHash} on it.
+     */
+    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
+        // Check the signature length
+        if (signature.length != 65) {
+            revert("ECDSA: invalid signature length");
+        }
+
+        // Divide the signature in r, s and v variables
+        bytes32 r;
+        bytes32 s;
+        uint8 v;
+
+        // ecrecover takes the signature parameters, and the only way to get them
+        // currently is to use assembly.
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            r := mload(add(signature, 0x20))
+            s := mload(add(signature, 0x40))
+            v := byte(0, mload(add(signature, 0x60)))
+        }
+
+        return recover(hash, v, r, s);
+    }
+
+    /**
+     * @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`,
+     * `r` and `s` signature fields separately.
+     */
+    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
+        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
+        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
+        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
+        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
+        //
+        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
+        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
+        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
+        // these malleable signatures as well.
+        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
+        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");
+
+        // If the signature is valid (and not malleable), return the signer address
+        address signer = ecrecover(hash, v, r, s);
+        require(signer != address(0), "ECDSA: invalid signature");
+
+        return signer;
+    }
+
+    /**
+     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
+     * replicates the behavior of the
+     * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]
+     * JSON-RPC method.
+     *
+     * See {recover}.
+     */
+    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
+        // 32 is the length in bytes of hash,
+        // enforced by the type signature above
+        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
+    }
+}
+
+
+// File contracts/libraries/EIP712.sol
+
+/**
+ * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
+ *
+ * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
+ * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
+ * they need in their contracts using a combination of `abi.encode` and `keccak256`.
+ *
+ * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
+ * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
+ * ({_hashTypedDataV4}).
+ *
+ * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
+ * the chain id to protect against replay attacks on an eventual fork of the chain.
+ *
+ * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
+ * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
+ *
+ * _Available since v3.4._
+ */
+abstract contract EIP712 {
+    /* solhint-disable var-name-mixedcase */
+    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
+    // invalidate the cached domain separator if the chain id changes.
+    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
+    uint256 private immutable _CACHED_CHAIN_ID;
+    address private immutable _CACHED_THIS;
+
+    bytes32 private immutable _HASHED_NAME;
+    bytes32 private immutable _HASHED_VERSION;
+    bytes32 private immutable _TYPE_HASH;
+
+    /* solhint-enable var-name-mixedcase */
+
+    /**
+     * @dev Initializes the domain separator and parameter caches.
+     *
+     * The meaning of `name` and `version` is specified in
+     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
+     *
+     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
+     * - `version`: the current major version of the signing domain.
+     *
+     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
+     * contract upgrade].
+     */
+    constructor(string memory name, string memory version) internal {
+        bytes32 hashedName = keccak256(bytes(name));
+        bytes32 hashedVersion = keccak256(bytes(version));
+        bytes32 typeHash = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
+        _HASHED_NAME = hashedName;
+        _HASHED_VERSION = hashedVersion;
+        _CACHED_CHAIN_ID = _getChainId();
+        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
+        _CACHED_THIS = address(this);
+        _TYPE_HASH = typeHash;
+    }
+
+    /**
+     * @dev Returns the domain separator for the current chain.
+     */
+    function _domainSeparatorV4() internal view returns (bytes32) {
+        if (address(this) == _CACHED_THIS && _getChainId() == _CACHED_CHAIN_ID) {
+            return _CACHED_DOMAIN_SEPARATOR;
+        } else {
+            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
+        }
+    }
+
+    function _buildDomainSeparator(bytes32 typeHash, bytes32 nameHash, bytes32 versionHash) private view returns (bytes32) {
+        return keccak256(abi.encode(typeHash, nameHash, versionHash, _getChainId(), address(this)));
+    }
+
+    /**
+     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
+     * function returns the hash of the fully encoded EIP712 message for this domain.
+     *
+     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
+     *
+     * ```solidity
+     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
+     *     keccak256("Mail(address to,string contents)"),
+     *     mailTo,
+     *     keccak256(bytes(mailContents))
+     * )));
+     * address signer = ECDSA.recover(digest, signature);
+     * ```
+     */
+    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
+        return keccak256(abi.encodePacked("\x19\x01", _domainSeparatorV4(), structHash));
+    }
+
+    function _getChainId() private view returns (uint256 chainId) {
+        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            chainId := chainid()
+        }
+    }
+}
+
+
+// File contracts/VRC25Permit.sol
+
+abstract contract VRC25Permit is VRC25, EIP712, IVRC25Permit {
+    bytes32 private constant PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
+
+    mapping(address => uint256) private _nonces;
+
+    constructor() EIP712("VRC25", "1") { }
+
+    /**
+     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
+     */
+    // solhint-disable-next-line func-name-mixedcase
+    function DOMAIN_SEPARATOR() external override view returns (bytes32) {
+        return _domainSeparatorV4();
+    }
+
+    /**
+     * @dev Returns an the next unused nonce for an address.
+     */
+    function nonces(address owner) public view virtual override(IVRC25Permit) returns (uint256) {
+        return _nonces[owner];
+    }
+
+    /**
+     * @dev See {IERC20Permit-permit}.
+     */
+    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external override {
+        require(block.timestamp <= deadline, "VRC25: Permit expired");
+
+        bytes32 structHash = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));
+        bytes32 hash = _hashTypedDataV4(structHash);
+        address signer = ECDSA.recover(hash, v, r, s);
+        require(signer == owner, "VRC25: Invalid permit");
+
+        uint256 fee = estimateFee(0);
+        _approve(owner, spender, value);
+        _chargeFeeFrom(owner, address(this), fee);
+    }
+
+    /**
+     * @dev Consumes a nonce.
+     *
+     * Returns the current value and increments nonce.
+     */
+    function _useNonce(address owner) internal returns (uint256) {
+        // For each account, the nonce has an initial value of 0, can only be incremented by one, and cannot be
+        // decremented or reset. This guarantees that the nonce never overflows.
+        // It is important to do x++ and not ++x here.
+        return _nonces[owner]++;
+    }
+}
+
+// File: contracts/MyVRC25Mintable.sol
+
+
+pragma solidity >=0.6.2;
+
+
+contract MyVRC25Mintable is VRC25Permit {
+    using Address for address;
+
+    constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _initialSupply) VRC25(_name, _symbol, _decimals) {
+        _mint(msg.sender, _initialSupply);
+    }
+
+    /**
+     * @notice Calculate fee required for action related to this token
+     * @param value Amount of fee
+     */
+    function _estimateFee(uint256 value) internal view override returns (uint256) {
+        return value + minFee();
+    }
+
+
+    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
+        return interfaceId == type(IVRC25).interfaceId || super.supportsInterface(interfaceId);
+    }
+
+    /**
+     * @notice Issues `amount` tokens to the designated `address`.
+     *
+     * Can only be called by the current owner.
+     */
+    function mint(address recipient, uint256 amount) external onlyOwner returns (bool) {
+        _mint(recipient, amount);
+        return true;
+    }
+}
\ No newline at end of file