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Check if a string is a valid Ethereum address with EIP-55 checksum validation 
import { Address } from '@tevm/voltaire/Address';

// Valid checksummed address
const validAddr = '0x742d35Cc6634C0532925a3b844Bc9e7595f251e3';
const isValid = Address.isValid(validAddr);
console.log(`${validAddr} is valid:`, isValid);

// Invalid checksum
const invalidChecksum = '0x742d35cc6634c0532925a3b844bc9e7595f251e3';
const hasValidChecksum = Address.isValidChecksum(invalidChecksum);
console.log(`${invalidChecksum} has valid checksum:`, hasValidChecksum);

// Not an address
const notAddress = '0x123';
console.log(`${notAddress} is valid:`, Address.isValid(notAddress));
This is a fully executable example. View the complete source with test assertions at examples/addresses/validate-address.ts.