Multi-Chain Contract Deployment Verifier

WHAT IT DOES

Multi-Chain Contract Deployment Verifier is a read-only developer tool that validates and reports on deployed smart contracts across EVM-compatible chains. It reads the contract address and chain ID, then fetches the deployment transaction hash, block number, deployer address, contract bytecode, creation code, source code hash, compiler version, optimization settings, constructor arguments, contract ABI, chain-specific deployment timestamp, and previous deployment attempts for the same address across multiple chains. The tool compares on-chain bytecode against provided source code (if supplied) and presents a comprehensive verification report, including a status indicating whether the deployment matches the expected source.

HOW TO USE

Connect your wallet via the built-in connector. Select the network where the contract is deployed. Enter the contract address you wish to verify. Optionally, provide the deployment transaction hash to fetch detailed deployment information. You can also paste the Solidity source code and constructor arguments for full verification. Click "verify deployment." The tool will read on-chain data including bytecode, creation code, and deployment metadata. If source code is provided, it will compare the computed bytecode hash against the on-chain bytecode. The results display: contract address, chain, deployer, deployment block, transaction hash, timestamp, bytecode hash, creation code hash, compiler version, optimization settings, ABI, cross-chain deployment records, and a verification status.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to interact with the blockchain. It fetches contract bytecode using `provider.getCode(contractAddress)` and computes its keccak256 hash for verification. If a deployment transaction hash is provided, it retrieves the transaction details via `provider.getTransaction(txHash)` and the associated block via `provider.getBlock(blockNumber)` to extract deployer address, block number, and timestamp. For full verification, the tool accepts Solidity source code and constructor arguments. It uses a simulated compiler pipeline to compute the expected creation bytecode hash: it combines the source code, compiler version, optimization settings, and constructor arguments (ABI-encoded) to generate the expected deployment bytecode. The tool also checks for previous deployment attempts by scanning `eth_getLogs` for `Creation` events at the same address across multiple chains, using adaptive chunking (halving the chunk size on failure) to handle different RPC limits. The ABI is read via `eth_getAbi` or derived from the source code if provided. All results are compiled into a single report.

WHAT IT CANNOT SEE

This tool cannot verify that the deployed code matches the intended source if the source is not provided. It cannot audit contract logic for vulnerabilities, hacks, or exploits. It cannot detect malicious code that compiles to the same bytecode—different source can produce identical bytecode in some cases. It cannot verify constructor arguments beyond the provided values. It cannot guarantee that the contract was not deployed through a proxy or factory (in which case the verification would be for the proxy's code, not the implementation). It cannot validate that the deployer address is authentic or authorized to deploy. It cannot ensure that the code behaves as expected under all conditions or edge cases. It cannot detect if the source code has been modified after the verification—only the on-chain bytecode is checked.

PLEASE NOTE

This tool is EVM-only and supports Ethereum, Polygon, BNB Chain, Arbitrum, Optimism, and Avalanche. All data is read-only—no transactions are signed. For full source verification, the source code must be provided in Solidity. The tool does not store or transmit any source code. Cross-chain records are based on `eth_getLogs` and may be incomplete if logs are pruned. Always verify contracts through multiple sources before interacting with them.