UUIDClaimProtocol.v1.js

const CryptoJS = require('crypto-js');

var inputUuid = 'e7587bd1-bb94-4949-9a75-7e50e0079a97'.toUpperCase().replace(/\-/g, '');
var claimer = 'Neruthes';

var payload1 = `UUIDClaimProtocol:v1:${inputUuid}:${claimer}`;
var payload2 = '';

// var bestHashParamHex = '0000000000000';
var bestHashParamHex =    '0000000F7B135';
// var bestHash = (new Array(64)).fill('F').join('');
var bestHash = '0000003BE9A5A226D4C88E208367E2E5C6CE70024DDF3CD78CE60F084FFE4C4E';

// The best is the hash which has the smallest number
// Hash function: SHA-256

var isThisHashBetterThan = function (comparingHash, baseHash) {
    if (parseInt(comparingHash, 16) <= parseInt(baseHash, 16)) {
        return true;
    } else {
        return false;
    };
};
var leftpad = function (str, len, pad) {
    if (str.length >= len) {
        return str;
    } else {
        return (new Array(len-str.length)).fill(pad).join('') + str;
    };
};
var getHash = function (i) {
    var paramHex = leftpad(i.toString(16).toUpperCase(), 13, '0');
    var payload2 = `${payload1}:${paramHex}`;
    var hash = CryptoJS.SHA256(payload2).toString(CryptoJS.enc.Hex).toUpperCase();
    return {
        param: paramHex,
        hash: hash
    };
};

var resumePoint = 0x13D5737;
for (var i = resumePoint; i < resumePoint + 2**24 || i < 2**40; i++) { // MAX 52 bits in JS to be safe
// for (var i = 0; i < 2**16; i++) { // MAX 52 bits in JS to be safe
    var currentHash = getHash(i);
    process.stdout.write(`\rCurrent progress: [${currentHash.param}] ${currentHash.hash}`);
    if (isThisHashBetterThan(currentHash.hash, bestHash)) {
        process.stdout.write(`\r`);
        console.log('\nFound a better hash.');
        console.log(`Previous hash: [${bestHashParamHex}] ${bestHash}`);
        console.log(`Current hash:  [${currentHash.param}] ${currentHash.hash}\n`);
        bestHash = currentHash.hash;
        bestHashParamHex = currentHash.param;
    };
    delete currentHash;
};

console.log('\n\n\n');
console.log(`Got the best hash for uuid "${inputUuid}" and claimer "${claimer}":`);
console.log(`Input for SHA-256: "${payload1}:${bestHashParamHex}"`);
console.log(`Best hash: ${bestHash}`);