UVerify opens up blockchain technology to everyone, no matter your background. Anchor file or text hashes on the Cardano blockchain, issue verifiable certificates, and build trust into any workflow — without deep blockchain expertise. Want to try it before diving into the code? Head over to app.uverify.io.

📖 Full documentation at docs.uverify.io

With UVerify you can store and retrieve data on the Cardano blockchain through a clean API and a customizable UI. Deploy your own instance or use the hosted version — whatever fits your needs. UVerify is designed to integrate into existing projects without requiring blockchain expertise. It is an open platform, not just a tool.

UVerify includes its own scoped chain indexer, a Web3 API key management system, on-chain metadata support, and extension points for both the backend and frontend. The frontend is built with React, while the backend is a Java Spring Boot application that leverages Yaci Store.

The fastest way to explore UVerify is app.uverify.io. No setup required. If you want to experiment without spending real ADA, use the preprod deployment at app.preprod.uverify.io.

Grab the docker-compose file and fire off:

docker compose up

The uverify-examples repository ships a full local devnet — UVerify UI, backend, chain indexer, and a Cardano devnet node — all in Docker:

git clone https://github.com/UVerify-io/uverify-examples
cd uverify-examples
uv run sandbox.py start

The sandbox faucet funds wallets instantly, so you can run every example without spending real ADA or touching a testnet.

Install the SDK for your language and start issuing certificates in minutes:

# TypeScript / JavaScript
npm install @uverify/sdk

# Python
pip install uverify-sdk

# Java (Maven / Gradle)
# io.uverify:uverify-sdk

Quick verify example (TypeScript):

import { UVerifyClient } from '@uverify/sdk';

const client = new UVerifyClient();

// Check whether a hash has a certificate on-chain
const certificates = await client.verify('your-sha256-hex-hash');
console.log(certificates);

Quick issue example (TypeScript):

import { UVerifyClient } from '@uverify/sdk';
import { sha256 } from 'js-sha256';

const client = new UVerifyClient({
  signTx: (unsignedTx) => wallet.signTx(unsignedTx, true),
  signMessage: (msg) => wallet.signData(address, msg),
});

const hash = sha256('Hello, UVerify!');

const txHash = await client.issueCertificates(address, [
  {
    hash,
    algorithm: 'SHA-256',
    metadata: { issuer: 'Acme Corp', description: 'Proof of existence' },
  },
]);

console.log('Certificate anchored! TxHash:', txHash);

See the SDK docs or the uverify-examples repository for complete runnable examples in TypeScript, Python, and Java, including diplomas, product passports, lab reports, and more.

UVerify lets you build use cases in a snap. For most things, it feels more like calling an API than wrestling with a full-blown blockchain solution:

Pass uverify_template_id in your certificate's metadata to control how it renders in the UI:

const metadata = {
  uverify_template_id: 'diploma',
  issuer: 'Acme University',
  recipient: 'Jane Doe',
};

UVerify ships several built-in templates you can use today:

There are two ways to add more:

Use or contribute a community template — Browse the uverify-additional-templates repository or add your own by implementing the abstract template. Contributions are welcome.

Build your own private template — Use the uverify-ui-template CLI to scaffold a new template and keep your branding exclusive to your deployment:

npx @uverify/cli init my-template

The Diploma template is a clean starting point for single-purpose certificates.