Waves address validation script

utility.js

const blake2b = require("blake2b");
const keccak = require('keccak');

validWavesAddress(address) {
        console.log(`Checking address validity...`)
        let bytes = this.fromBase58(address);

        const _blake2b = (data) => {
            return blake2b(32).update(data).digest();
        }
            
        const _keccak = (data) => {
            return keccak('keccak256').update(Buffer.from(data)).digest();
        }
        
        const _hashChain = (key) => {
            return _keccak(_blake2b(key));
        }
        
        const key = bytes.slice(0, 22);
        const checkSum = bytes.slice(22, 26);
        const keyHash = Array.from(_hashChain(key));
        
        let validChecksum = (bytes) => {
            for (let i = 0; i < 4; i++) {
                if (checkSum[i] !== keyHash[i]) {
                    return false;
                }
            }
            return true;
        }

        let response = (
            bytes.byteLength === 26 && 
            bytes[0] === 1 &&
            bytes[1] === 87 &&
            validChecksum(bytes)) ? 
            (true) : (false);

        (response === true) ? 
            (console.log(`Valid address!`)) : 
            (console.log(`Invalid address!`));
        
        return response;
    }