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Release Notes: Flare and Songbird networks

Here are listed specific changes to the code for the Flare and Songbird networks. For a comprehensive list of general changes, see here for the AvalancheGo project and here for the Coreth project.

v1.13.0

The changes go into effect

  • March 17, 2026 at 12 PM UTC for the Coston network,
  • March 24, 2026 at 12 PM UTC for the Coston2 network,
  • March 31, 2026 at 12 PM UTC for the Songbird network,
  • April 14, 2026 at 12 PM UTC for the Flare network.

v1.12.0

The changes go into effect

  • November 13, 2025 at 10 AM UTC for the Coston network,
  • November 13, 2025 at 2 PM UTC for the Coston2 network,
  • November 25, 2025 at 12 PM UTC for the Songbird network,
  • December 2, 2025 at 12 PM UTC for the Flare network.

Note:

  • In contrast to Avalanche, the minimum C-chain base fee after the fork remains at 25 GWei.
  • Minimum price per unit of gas used in P-chain dynamic transaction fee calculation is set to 250 nFLR.

v1.11.0

The changes go into effect

  • June 24, 2025 at 12 PM UTC for the Coston2 network,
  • July 1, 2025 at 12 PM UTC for the Coston network,
  • July 22, 2025 at 12 PM UTC for the Songbird network,
  • August 5, 2025 at 12 PM UTC for the Flare network.

Note:

  • Avalanche added in v1.10.3 a new config --http-allowed-hosts with a default value of localhost. Set --http-allowed-hosts="*" to allow RPC calls for all hosts.

v1.10.0

The changes go into effect on May 6, 2025 at 12 PM UTC for the Songbird network and on May 13, 2025 at 12 PM UTC for the Flare network.

Specific changes:

  • Return delegators in platform.getCurrentValidators when the environment variable COMPLETE_GET_VALIDATORS is set to true. (Only the number of delegators is returned by default unless only one node is specified.)

  • AddPermissionlessValidatorTx and AddPermissionlessDelegatorTx transactions are enabled for the primary network (they were disabled in 1.9.0) and are the preferred way to add delegators and validators as we plan to disable AddValidatorTx and AddDelegatorTx transactions in v1.11.0 to align with Avalanche.

  • Reduce the target gas (for the 10-second rolling window used for dynamic fee calculation) to 15,000,000 from 150,000,000 for the Songbird network to be consistent with the Flare network.

Note:

  • We recommend using AddPermissionlessValidatorTx and AddPermissionlessDelegatorTx transactions for adding validators and delegators after the fork. When creating AddPermissionlessValidatorTx you need to specify the BLS proof of posession (BLS public key and signature). You can find the BLS proof of posession in the response of info.getNodeID API. Path to the BLS private key is specified with --staking-signer-key-file. The default is ~/.avalanchego/staking/signer.key. If it does not exist, it will be populated with a new key. You should copy it to your persistent storage along with the existing staker.crt and staker.key files.

v1.9.0

Specific changes:

  • AddPermissionlessValidatorTx and AddPermissionlessDelegatorTx transactions are disabled.

  • Subnets are disabled.

  • We allow Ethereum-style signatures for P-chain transactions (EIP-191).