Sidetree style merkle proof receipts

merkle-proof-receipts.js

const MerkleTools = require("merkle-tools");
const crypto = require("crypto");

const sha256 = data => {
  const h = crypto.createHash("sha256");
  h.update(data);
  return h.digest("hex");
};

let treeOptions = {
  hashType: "sha256" // optional, defaults to 'sha256'
};

let operations = ["create:did:123", "update:did:456", "delete:did:789"];

let merkleTools = new MerkleTools(treeOptions);
merkleTools.addLeaves(operations, true);

merkleTools.makeTree();

const merkleRoot = merkleTools.getMerkleRoot();

const receipts = operations.map(operation => {
  return {
    operationHash: sha256(operation),
    operationProof: merkleTools.getProof(operations.indexOf(operation))
  };
});

console.log(JSON.stringify(receipts, null, 2));

const validatedReceipts = receipts.map(r => {
  return merkleTools.validateProof(
    r.operationProof,
    r.operationHash,
    merkleRoot
  );
});

console.log(validatedReceipts);

merkleTools.resetTree();