diff --git a/Cargo.lock b/Cargo.lock
index 616d65cfd..908c46013 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1687,6 +1687,7 @@ dependencies = [
  "kona-derive",
  "kona-mpt",
  "kona-preimage",
+ "kona-primitives",
  "lru",
  "op-alloy-consensus",
  "revm",
diff --git a/bin/host/src/cli/mod.rs b/bin/host/src/cli/mod.rs
index 4ef072dd5..8e51bc310 100644
--- a/bin/host/src/cli/mod.rs
+++ b/bin/host/src/cli/mod.rs
@@ -52,6 +52,9 @@ pub struct HostCli {
     /// Number of the L2 block that the claim is from.
     #[clap(long)]
     pub l2_block_number: u64,
+    /// The L2 chain ID.
+    #[clap(long)]
+    pub l2_chain_id: u64,
     //// Path to the genesis file.
     #[clap(long)]
     pub l2_genesis_path: PathBuf,
diff --git a/bin/host/src/kv/local.rs b/bin/host/src/kv/local.rs
index de64cfa74..e66583df4 100644
--- a/bin/host/src/kv/local.rs
+++ b/bin/host/src/kv/local.rs
@@ -4,8 +4,8 @@ use super::KeyValueStore;
 use crate::cli::HostCli;
 use alloy_primitives::B256;
 use kona_client::{
-    L1_HEAD_KEY, L2_CHAIN_CONFIG_KEY, L2_CHAIN_ID_KEY, L2_CLAIM_BLOCK_NUMBER_KEY, L2_CLAIM_KEY,
-    L2_OUTPUT_ROOT_KEY, L2_ROLLUP_CONFIG_KEY,
+    L1_HEAD_KEY, L2_CHAIN_ID_KEY, L2_CLAIM_BLOCK_NUMBER_KEY, L2_CLAIM_KEY, L2_OUTPUT_ROOT_KEY,
+    L2_ROLLUP_CONFIG_KEY,
 };
 use kona_preimage::PreimageKey;
 
@@ -29,9 +29,8 @@ impl KeyValueStore for LocalKeyValueStore {
             L2_OUTPUT_ROOT_KEY => Some(self.cfg.l2_output_root.to_vec()),
             L2_CLAIM_KEY => Some(self.cfg.l2_claim.to_vec()),
             L2_CLAIM_BLOCK_NUMBER_KEY => Some(self.cfg.l2_block_number.to_be_bytes().to_vec()),
-            L2_CHAIN_ID_KEY => todo!(),
-            L2_CHAIN_CONFIG_KEY => todo!(),
-            L2_ROLLUP_CONFIG_KEY => todo!(),
+            L2_CHAIN_ID_KEY => Some(self.cfg.l2_chain_id.to_be_bytes().to_vec()),
+            L2_ROLLUP_CONFIG_KEY => unimplemented!("L2RollupConfig fetching in local store not implemented. Necessary for chain IDs without a known rollup config."),
             _ => None,
         }
     }
diff --git a/bin/programs/client/Cargo.toml b/bin/programs/client/Cargo.toml
index db7cc9b05..0f93ac4c7 100644
--- a/bin/programs/client/Cargo.toml
+++ b/bin/programs/client/Cargo.toml
@@ -25,6 +25,7 @@ async-trait.workspace = true
 kona-common = { path = "../../../crates/common", version = "0.0.1" }
 kona-common-proc = { path = "../../../crates/common-proc", version = "0.0.1" }
 kona-preimage = { path = "../../../crates/preimage", version = "0.0.1" }
+kona-primitives = { path = "../../../crates/primitives", version = "0.0.1" }
 kona-mpt = { path = "../../../crates/mpt", version = "0.0.1" }
 kona-derive = { path = "../../../crates/derive", version = "0.0.1" }
 
diff --git a/bin/programs/client/justfile b/bin/programs/client/justfile
index fb54f5d69..cbd49030a 100644
--- a/bin/programs/client/justfile
+++ b/bin/programs/client/justfile
@@ -17,6 +17,7 @@ run-client-native l1_rpc l1_beacon_rpc l2_rpc verbosity:
   L2_OUTPUT_ROOT=$(cast 2b 0)
   L2_CLAIM=$(cast 2b 0)
   L2_BLOCK_NUMBER=0
+  L2_CHAIN_ID=10
 
   L1_NODE_ADDRESS="{{l1_rpc}}"
   L1_BEACON_ADDRESS="{{l1_beacon_rpc}}"
@@ -36,6 +37,7 @@ run-client-native l1_rpc l1_beacon_rpc l2_rpc verbosity:
     --l2-claim $L2_CLAIM \
     --l2-output-root $L2_OUTPUT_ROOT \
     --l2-block-number $L2_BLOCK_NUMBER \
+    --l2-chain-id $L2_CHAIN_ID \
     --l1-node-address $L1_NODE_ADDRESS \
     --l1-beacon-address $L1_BEACON_ADDRESS \
     --l2-node-address $L2_NODE_ADDRESS \
diff --git a/bin/programs/client/src/boot.rs b/bin/programs/client/src/boot.rs
index 32dd0cb8d..da7fef421 100644
--- a/bin/programs/client/src/boot.rs
+++ b/bin/programs/client/src/boot.rs
@@ -4,6 +4,7 @@
 use alloy_primitives::{B256, U256};
 use anyhow::{anyhow, Result};
 use kona_preimage::{PreimageKey, PreimageOracleClient};
+use kona_primitives::{RollupConfig, OP_MAINNET_CONFIG};
 
 /// The local key ident for the L1 head hash.
 pub const L1_HEAD_KEY: U256 = U256::from_be_slice(&[1]);
@@ -20,11 +21,8 @@ pub const L2_CLAIM_BLOCK_NUMBER_KEY: U256 = U256::from_be_slice(&[4]);
 /// The local key ident for the L2 chain ID.
 pub const L2_CHAIN_ID_KEY: U256 = U256::from_be_slice(&[5]);
 
-/// The local key ident for the L2 chain config.
-pub const L2_CHAIN_CONFIG_KEY: U256 = U256::from_be_slice(&[6]);
-
 /// The local key ident for the L2 rollup config.
-pub const L2_ROLLUP_CONFIG_KEY: U256 = U256::from_be_slice(&[7]);
+pub const L2_ROLLUP_CONFIG_KEY: U256 = U256::from_be_slice(&[6]);
 
 /// The boot information for the client program.
 ///
@@ -49,6 +47,8 @@ pub struct BootInfo {
     pub l2_claim_block: u64,
     /// The L2 chain ID.
     pub chain_id: u64,
+    /// The rollup config for the L2 chain.
+    pub rollup_config: RollupConfig,
 }
 
 impl BootInfo {
@@ -89,7 +89,16 @@ impl BootInfo {
                 .try_into()
                 .map_err(|_| anyhow!("Failed to convert L2 chain ID to u64"))?,
         );
+        let rollup_config = rollup_config_from_chain_id(chain_id)?;
+
+        Ok(Self { l1_head, l2_output_root, l2_claim, l2_claim_block, chain_id, rollup_config })
+    }
+}
 
-        Ok(Self { l1_head, l2_output_root, l2_claim, l2_claim_block, chain_id })
+/// Returns the rollup config for the given chain ID.
+fn rollup_config_from_chain_id(chain_id: u64) -> Result<RollupConfig> {
+    match chain_id {
+        10 => Ok(OP_MAINNET_CONFIG),
+        _ => anyhow::bail!("Unsupported chain ID: {}", chain_id),
     }
 }
diff --git a/bin/programs/client/src/lib.rs b/bin/programs/client/src/lib.rs
index 3110a0d79..e4ef5a6e0 100644
--- a/bin/programs/client/src/lib.rs
+++ b/bin/programs/client/src/lib.rs
@@ -13,6 +13,6 @@ pub use comms::{CachingOracle, HINT_WRITER, ORACLE_READER};
 
 mod boot;
 pub use boot::{
-    BootInfo, L1_HEAD_KEY, L2_CHAIN_CONFIG_KEY, L2_CHAIN_ID_KEY, L2_CLAIM_BLOCK_NUMBER_KEY,
-    L2_CLAIM_KEY, L2_OUTPUT_ROOT_KEY, L2_ROLLUP_CONFIG_KEY,
+    BootInfo, L1_HEAD_KEY, L2_CHAIN_ID_KEY, L2_CLAIM_BLOCK_NUMBER_KEY, L2_CLAIM_KEY,
+    L2_OUTPUT_ROOT_KEY, L2_ROLLUP_CONFIG_KEY,
 };