Cross-Chain Credential Verification Tool

WHAT IT DOES

Cross-Chain Credential Verification Tool is a read-only blockchain utility that retrieves and displays credential-related data from any EVM-compatible chain. It reads credential contract parameters, user credential status, verification records, issuer status, delegation history, bridge state, and verification history. The tool accepts either a credential contract address or a token ID and presents a structured view of all relevant on-chain data. It is designed for security researchers, auditors, and users who need to verify the state of cross-chain credentials without performing any transactions.

HOW TO USE

Connect your wallet via the built-in connector (MetaMask or any WalletConnect-compatible wallet). Select the target network from the dropdown—Ethereum, Polygon, BNB Chain, Arbitrum, Optimism, Avalanche, or custom. Enter a credential contract address (0x...) or a token ID number. Choose the lookup type (contract address or token ID) and click "Look Up." The tool will retrieve and display: contract/token identifier, chain, credential parameters, user status, issuer status, delegation history, bridge state, and verification history. All reads are performed directly through your connected wallet's provider—no central server or API key is required.

TECHNICAL MECHANISM

This tool uses ethers.js v5.7.2 to interact with on-chain data. It employs an adaptive chunking algorithm when scanning historical logs: the scanner walks backward from the current block in chunks, and if a provider rejects a range (due to rate limits or block-range caps), it halves the chunk size and retries. This ensures the scan continues rather than failing on the first refusal. The tool also distinguishes between historical log events and current state—for example, it reads approval events but confirms current allowances via allowance() or isApprovedForAll() calls. Native balance checks account for gas fees by deducting the estimated fee from the total before computing spendable amounts. All batch operations are sequential and awaited to avoid nonce conflicts. The effective gas price (receipt.effectiveGasPrice) is used for cost calculations, not the tx.gasPrice cap, ensuring accurate post-EIP-1559 accounting.

WHAT IT CANNOT SEE

This tool cannot verify off-chain credential authenticity. It cannot ensure credential accuracy or detect credential fraud. It does not validate issuer identity beyond on-chain addresses. It cannot guarantee cross-chain credential completeness—bridging events may be missed if logs are pruned. It cannot assure that the credential contracts are free from vulnerabilities, exploits, or malicious logic. It cannot verify the real-world identity of any participant. It cannot detect revoked credentials that are not recorded on-chain.

PLEASE NOTE

This tool works exclusively with EVM-compatible chains (Ethereum, Polygon, BNB Chain, Arbitrum, Optimism, Avalanche, and others). It does not support non-EVM chains like Solana, Cosmos, or Bitcoin. The tool is read-only—it never initiates transactions, does not ask for signatures, and never moves funds. All data is retrieved from the public RPC endpoints provided by your wallet; network reliability depends on your RPC provider.