diff --git a/chains/arbitrum/testing/rosetta-testing-arbitrum/src/lib.rs b/chains/arbitrum/testing/rosetta-testing-arbitrum/src/lib.rs
index 628d9a63..ccadfae9 100644
--- a/chains/arbitrum/testing/rosetta-testing-arbitrum/src/lib.rs
+++ b/chains/arbitrum/testing/rosetta-testing-arbitrum/src/lib.rs
@@ -60,7 +60,7 @@ mod tests {
 
     /// Account used to fund other testing accounts.
     const FUNDING_ACCOUNT_PRIVATE_KEY: [u8; 32] =
-        hex!("8aab161e2a1e57367b60bd870861e3042c2513f8a856f9fee014e7b96e0a2a36");
+        hex!("b6b15c8cb491557369f3c7d2c287b053eb229daa9c22138887752191c9520659");
 
     /// Account used exclusively to continuously sending tx to mine new blocks.
     const BLOCK_INCREMENTER_PRIVATE_KEY: [u8; 32] =
diff --git a/chains/ethereum/server/src/client.rs b/chains/ethereum/server/src/client.rs
index 79844a2d..f4f64144 100644
--- a/chains/ethereum/server/src/client.rs
+++ b/chains/ethereum/server/src/client.rs
@@ -62,6 +62,11 @@ impl BlockFinalityStrategy {
             // and polygon block interval is ~2 seconds, 30 minutes / 2 seconds == 900 blocks.
             ("polygon", false) => Self::Confirmations(900),
             ("polygon", true) => Self::Confirmations(6), // For local testnet use 6 confirmations
+            // TODO: ISSUE-242 Replace this hack by quering arbitrum checkpoints
+            // Arbitrum finalized blocks are stored on ethereum mainnet roughly every 15 minutes
+            // Arbitrum block interval is ~0.26 seconds, 15 minutes / 0.26 = ~3462
+            ("arbitrum", false) => Self::Confirmations(3462),
+            ("arbitrum", true) => Self::Confirmations(230),
             _ => Self::Finalized,
         }
     }