Introduction

Welcome to the Tonomy SDK developer documentation.

Tonomy enables developers to integrate self-sovereign identity and secure data storage into their Web2 and Web3 applications. Whether you’re building a SaaS platform requiring high-security logins or a Web3 dApp needing user-controlled digital signatures and credentials, Tonomy provides a privacy-first, developer-friendly solution.

With Tonomy ID, users log in without passwords, sign data with private keys stored securely on their devices, and control their personal data—without relying on third parties.

Why Integrate Tonomy?

• Frictionless User Authentication: Passwordless Single Sign-On (SSO)

• Strong User Verification: W3C Verifiable Credentials

• High-Security Digital Signatures: Non-repudiation for documents, transactions, and data

• Data Privacy by Default: Sovereign Data Vault for user-controlled storage

• Flexible for Web2 & Web3: Use in SaaS platforms, enterprise apps, dApps, and beyond

Try it out now: Demo App

Read the Tonomy ID White Paper