Multisigned

An open source digital locker for Ethereum seed phrases using WebAuthn passkeys.

Overview

Multisigned enables users to securely store encrypted Ethereum seed phrases using WebAuthn's PRF (Pseudo-Random Function) extension. The encryption key is derived from your passkey, allowing you to access your seed phrase across devices without traditional password-based encryption.

Read the lightpaper for the full motivation and protocol design.

Setup

npm install
cp .env.example .env

Edit .env and set:

• HTTP_PORT - Server port (default: 3000)
• JWT_SECRET - Secret for JWT token signing (required)

Development

npm run dev

Server runs at http://localhost:3000

How it Works

1. User creates a passkey via WebAuthn
2. Passkey's PRF extension derives a deterministic encryption key
3. Browser generates and encrypts an Ethereum seed phrase
4. Encrypted data is stored on the server
5. User can retrieve and decrypt using the same passkey on any device

Contact

Questions or want to contribute? Reach out to @freeatnet or @timdaub on Telegram, or join our group: https://t.me/+MT5G5BZUQTU2ODRk