tree-jen.js

const { MerkleTree } = require('merkletreejs')
const keccak256 = require('keccak256')

const leaves = [
    ["0x15412D1f9C63e9123Fa62a3E385a130f5C959De5",1],
    ["0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2",2],
    ["0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db",3],
    ["0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2",4],
  ].map(x => keccak256(x))

const tree = new MerkleTree(leaves, keccak256, { sort: true })
const root = tree.getHexRoot()
console.log(root)

const leaf = keccak256(["0x15412D1f9C63e9123Fa62a3E385a130f5C959De5",1])
console.log(keccak256(["0x15412D1f9C63e9123Fa62a3E385a130f5C959De5",1]).toString('hex'))

const badleaf = keccak256('x')
const proof = tree.getProof(leaf)
const hexproof = tree.getHexProof(leaf)
console.log(hexproof)

const badproof = tree.getProof(badleaf)
console.log(tree.verify(proof, leaf, root)) // true
console.log(tree.verify(badproof, badleaf, root)) // false