const sha256 = require('js-sha256')

console.log(sha256('wuhaiyang1').toString())
console.log(sha256('wuhaiyang1').toString())

function proofOfWork(){
    let data = 'wuhaiyang'
    let x = 1
    while(true){
        if(sha256(data + x).toString().substring(0,6) !== '000000'){
            x = x + 1
        }else{
            console.log(sha256(data + x).toString())
            console.log(x)
            break
        }
    }
}

proofOfWork()