multichain-address-validator/src/validators/nem_validator.ts

Multichain address validator for Bitcoin and other blockchains.

import {Buffer} from 'buffer'

import cryptoUtils from '../crypto/utils.js'
import {Address} from '../types.js'
import {getAddress} from '../helpers.js'

export default {
    isValidAddress(address: Address) {
        const addr = getAddress(address).toString().toUpperCase().replace(/-/g, '');
        if (!address || addr.length !== 40) {
            return false;
        }
        const decoded = cryptoUtils.toHex(cryptoUtils.base32.b32decode(addr));
        const stepThreeChecksum = cryptoUtils.keccak256Checksum(Buffer.from(decoded.slice(0, 42), 'hex'));

        return stepThreeChecksum === decoded.slice(42);
    }
}