Cross-Chain Deployment Address Consistency Verifier

WHAT IT DOES

Cross-Chain Deployment Address Consistency Verifier is a read-only developer tool that verifies that the same contract address holds identical bytecode across multiple EVM-compatible chains. It reads contract bytecode via eth_getCode on each specified chain, compares the bytecode hashes and content, and provides a detailed report showing which chains match and which differ. The tool helps developers confirm that cross-chain deployments are consistent, detect deployment errors or version mismatches, and ensure that contracts behave identically across all target networks. It is essential for projects deploying the same contract across multiple chains (Ethereum, Polygon, BSC, Arbitrum, Optimism, Avalanche, etc.).

HOW TO USE

Connect your EVM-compatible wallet via the BGWallet bridge and select the network where your contract is deployed (this becomes the reference chain). Enter the contract address and a comma-separated list of chains to verify (e.g., ethereum,polygon,bsc,arbitrum,optimism,avalanche). Click "Verify Consistency" to fetch bytecode from the current chain and all specified chains. Results include a summary of all verified chains, a comparison table showing chain name, chain ID, code hash, balance, and status (Match/Mismatch/Error), an overall consistency status (Consistent/Inconsistent), and a summary of matching, mismatching, and error chains. The tool also provides a detailed breakdown of any mismatches. All analysis is read-only—no signatures or transactions are submitted.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to fetch contract bytecode via provider.getCode(address) from multiple chains. It uses the current provider for the reference chain, and creates independent JsonRpcProvider instances for each target chain using built-in RPC endpoints. For each chain, it retrieves the bytecode, checks if the code is present (non-empty), computes a truncated code hash (first 8 characters of the hex string for display), and compares the full bytecode string against the reference chain's bytecode. The tool also fetches the balance via provider.getBalance(address) and block number via provider.getBlockNumber() for context. Results are aggregated into a structured report with status indicators: "ok" for matching bytecode, "mismatch" for differences, and "error" for failed fetches. The overall consistency status is determined by checking if all non-error chains match the reference bytecode. The tool includes built-in RPC endpoints for supported chains and provides clear error messages for unknown chains or failed connections.

WHAT IT CANNOT SEE

This tool has fundamental limitations that users must understand. It cannot automatically detect CREATE2 address predictions or deterministic deployment patterns without user input—the tool only verifies that the bytecode at a given address matches, not how the contract was deployed. It cannot verify that the same private key or deployer address was used across chains without external confirmation—the tool does not check deployer identity. It cannot detect cross-chain deployment discrepancies that occur due to different compiler versions or optimization settings—the tool only checks bytecode equality, not the source code or compiler metadata. It cannot guarantee that identical bytecode means identical behavior across chains with different EVM implementations—some chains have slight EVM variations that could affect behavior. It cannot automatically correct or resolve address inconsistencies—the tool is read-only and only reports differences. It cannot verify contracts on chains that are not in its RPC endpoint database. It cannot detect differences in storage state or runtime behavior—only bytecode is compared. It cannot verify contracts that are not deployed or that have been self-destructed. The tool's RPC endpoints are public and may be rate-limited.

PLEASE NOTE

This tool only supports EVM-compatible blockchains (Ethereum, Polygon, BSC, Avalanche C-Chain, Optimism, Arbitrum, and their testnets). Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. The tool is free, open-source, requires no API keys, and uses the wallet's native provider for all read operations. Always verify that the RPC endpoints used are reliable and that the contract address is correct on each target chain.