Cross-Chain Address Consistency Checker

WHAT IT DOES

Cross-Chain Address Consistency Checker is a read-only security tool that analyzes whether a given wallet or contract address is active and consistent across multiple EVM-compatible chains. It reads the input address and a user-provided list of target chain IDs. For each chain, it checks address existence (via nonce or bytecode), transaction history, token balances, contract deployment records, and address activity timestamps. The tool also validates the address checksum format and checks for previous cross-chain address associations. It compiles a report showing which chains have activity, the transaction count, token balances, and whether a contract is deployed at that address, culminating in a consistency score.

HOW TO USE

Connect your wallet via the built-in connector. Enter the address you want to check. Provide a comma-separated list of target chain IDs (e.g., "1,137,56" for Ethereum, Polygon, and BNB Chain). Click "check consistency." The tool will read on-chain data for each chain and display: the address, checksum validity, a consistency score (percentage of chains where the address is active), and a detailed chain breakdown showing existence status, transaction count, token balance, and contract deployment status. It also shows previous associations found for the address across chains.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to interact with each target chain. For each chain, it first checks if the address is a contract using `provider.getCode(address)`—if non-empty, the address is a contract. For externally owned accounts, it checks the nonce via `provider.getTransactionCount(address)`; a nonce greater than 0 indicates activity. It retrieves transaction history by scanning `eth_getLogs` with adaptive chunking (halving the chunk size on failure) to handle RPC limits, counting transactions from and to the address. Token balances are read using `balanceOf(address)` for a set of common tokens (USDC, USDT, DAI, WETH, etc.) and native balance via `provider.getBalance(address)`. Contract deployment records are checked by scanning for `Creation` events where the address is the created contract. Address activity timestamps are extracted from the most recent transaction associated with the address. The tool also validates the checksum using `ethers.utils.getAddress(address)`. All this data is aggregated per chain, and the consistency score is calculated as the percentage of chains where the address shows any activity (nonce > 0 or code non-empty). Previous cross-chain associations are looked up by scanning for address mentions across chains.

WHAT IT CANNOT SEE

This tool cannot verify that addresses are controlled by the same entity across chains—activity on an address does not prove ownership. It cannot detect address squatting or typosquatting, where similar addresses are registered. It cannot confirm off-chain identity or ownership of the address. It cannot validate that addresses are not being impersonated. It cannot guarantee that a consistent address pattern indicates the same owner; different individuals could generate the same address pattern through deterministic methods. It cannot detect if the address was generated deterministically (e.g., via CREATE2) with malicious intent. It cannot ensure address consistency across non-EVM chains—it only works within EVM-compatible networks. It cannot detect if an address is active but uses privacy tools or mixers.

PLEASE NOTE

This tool is EVM-only and supports Ethereum, Polygon, BNB Chain, Arbitrum, Optimism, and Avalanche. All reads are performed through your connected wallet's provider—no centralized APIs are used. The consistency score is an indicator of activity spread, not ownership. Always verify addresses through multiple sources before trusting cross-chain interactions. The tool does not store or transmit any address data.