Three Address Checksums, Three Engineering Philosophies — Verifying Base58Check, Bech32m, and EIP-55 in 250 Lines of Browser JS

When you paste a wallet address into something, the something either typo-checks it or it doesn't. Most engineers reach for validate_address(addr) from a library and move on. Spend an hour writing the verifiers from scratch and you discover something interesting: Bitcoin and Ethereum have completely