This library provides a TypeScript/JavaScript API for verifying Truestamp Commitments.

This library is intended to provide thorough cryptographic verification of Truestamp Commitments. Ideally, this verification is independent of, and without reliance on, Truestamp services or APIs. This library has no external dependencies.

This independence helps provides users with the confidence that their Commitments are verifiable for the long term. The code for this verification is intended to be simple to audit so as to provide confidence in its functionality and security.

The verification of the cryptographic integrity of the Commitment is always performed locally and requires no access to the Internet. There are requests made to a few external services for the purpose of comparing locally calculated results to values expected to be stored on chain.

Currently, the server keys.truestamp.com will be called to help verify that the public key in the signature is authoritative.

Additional requests may be made to third-party blockchain APIs in order to verify transactions for that chain or service.

The library will return a comprehensive audit object to indicate overall pass/fail verification, as well as more granular information to indicate what exactly failed.

npm install @truestamp/verify

Node.js:

// Node.js Require
const { assertVerified, isVerified, verify } = require('@truestamp/verify')

// ES Modules Import
// import { assertVerified, isVerified, verify } from '@truestamp/verify';

// Substitute with a Truestamp commitment object to be verified.
const commitment = {...}

// Returns a Promise that resolves to an object that details commitment
// properties and a summary of what this commitment attests to.
// It also provides pointers to the web URL's (e.g. blockchain explorer API)
// that were used to verify transactions and where commitments can be
// manually verified by comparing a hash with your own eyes.
console.log('verify', await verify(commitment))

// Resolves to boolean `true` or `false` and will not throw Errors
if (await isVerified(commitment)) {
  console.log('verified')
} else {
  console.log('bad commitment')
}

// Throws an Error on commitment validation issue,
// or external service verification failure. Resolves
// to `void` (returns nothing) if verified OK.
await assertVerified(commitment)

A more detailed version of this example can be found in [examples/example.cjs].

The TypeScript API documentation for this project is generated and published upon each new release.

This library aims to achieve 100% code test coverage.

npm install
npm test

We'd love you to join our network of contributors. Please read CONTRIBUTING.md for help getting started.

• Commit changes, merge PR's to main branch
• Bump version field in package.json
• Cut a new release
• New release will trigger workflow to build, test, and publish package to Github Package Registry and NPM.js.

We expect all members of the community to respect our Code of Conduct at all times.

Copyright © 2022 Truestamp Inc. All Rights Reserved.