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Convert addresses to EIP-55 checksummed format for safer usage 
import { Address } from '@tevm/voltaire/Address';

// Lowercase address (no checksum)
const lowercaseAddr = '0x5aaeb6053f3e94c9b9a09f33669435e7ef1beaed';

// Convert to checksummed format
const addr = Address(lowercaseAddr);
const checksummed = Address.toChecksummed(addr);
console.log('Checksummed:', checksummed);

// Verify the checksum is valid
const isValid = Address.isValidChecksum(checksummed);
console.log('Is valid checksum:', isValid);

// Mixed case is preserved for checksum
console.log('Original:', lowercaseAddr);
console.log('Result:  ', checksummed);
This is a fully executable example. View the complete source with test assertions at examples/addresses/checksum-address.ts.