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Product Brief: Sign in with NFT

Product Name:

Sign in with NFT

Product Manager:

[Your Name]

Last Updated:

[Date]

1. Product Overview

"Sign in with NFT" is a decentralized authentication solution that allows users to sign in to websites using their NFTs as login credentials. The solution leverages Ethereum and other EVM-compatible blockchains to verify NFT ownership and allows websites to adopt a secure, seamless, and user-owned login system.

This solution will be provided as an open-source SDK that any website can easily integrate into their front-end and back-end infrastructure, enabling crypto users to authenticate with their wallet and NFTs.

2. Target Audience

  1. Users (End-Users)

    • Crypto enthusiasts and NFT holders.
    • Users of Web3 platforms looking for a decentralized login method.
    • Privacy-conscious users who want to control their own digital identity.

  2. Developers (Website Developers)

    • Web2 and Web3 developers who want to integrate NFT-based login to onboard crypto users.
    • Platforms looking to increase engagement by offering NFT-based rewards and access.
    • E-commerce, content, and membership sites looking to simplify payments and authentication by linking wallets.

3. Key Objectives

  • Ease of Integration: Developers should be able to integrate "Sign in with NFT" into their websites with minimal effort using a lightweight JavaScript SDK.
  • User Ownership: Users should have full ownership of their login credentials via NFTs, with no need for centralized account management.
  • Cross-Chain Compatibility: The solution should initially support Ethereum and Polygon, with the ability to expand to other EVM chains in the future.
  • High Security: The login process must ensure secure verification of NFT ownership and wallet signatures.
  • Customizability: Developers should be able to customize login requirements based on specific NFT collections or attributes.

4. Core Features

  1. User Login with NFTs

    • Users authenticate themselves using their wallet (MetaMask, WalletConnect) and the NFTs they own.
    • The SDK will handle the wallet connection, signature generation, and verification.

  2. Customizable NFT Login Rules

    • Websites can define the specific NFTs or collections that users must own to log in.
    • Optional customization based on NFT attributes (e.g., rare NFTs granting premium access).

  3. Wallet Connection

    • Support for popular wallets (MetaMask, WalletConnect, etc.) to allow users to connect and sign in easily.
    • After the wallet connects, the user signs a challenge message proving they control the wallet.

  4. Backend NFT Verification

    • The back-end verifies the signed message and NFT ownership by querying the blockchain (Ethereum, Polygon, etc.).
    • This ensures that only users holding the required NFT can sign in.

  5. Cross-Platform Integration

    • The SDK should work across various types of websites, including e-commerce, membership, social platforms, and content platforms.

  6. Multi-Chain Support

    • Initial support for Ethereum and Polygon, with a roadmap to expand to more chains like Optimism, Arbitrum, and Base.

5. Technical Requirements

A. Front-End Requirements

  • SDK Integration:

    • Provide a lightweight JavaScript SDK for developers to integrate the "Sign in with NFT" button on their websites.
    • The SDK should handle wallet connections, challenge generation, and interaction with the wallet provider (MetaMask, WalletConnect, etc.).

  • Wallet Interaction:

    • Ensure seamless connection to wallets like MetaMask.
    • Handle errors gracefully if users fail to connect their wallet or sign the message.
    • Provide developers the ability to customize the UI for the wallet connection.

B. Back-End Requirements

  • Challenge Message Generation:

    • The back-end must generate a unique challenge message for the user to sign. This message should include a timestamp to prevent replay attacks.

  • Signature Verification:

    • Verify the signed message from the wallet to ensure that it matches the public key of the user's address.

  • NFT Ownership Verification:

    • Query the blockchain (Ethereum, Polygon, etc.) to check if the wallet address holds the required NFT.
    • If the user owns the required NFT, proceed with authentication. If not, return an error message.

C. Blockchain Interaction

  • Node Setup:

    • Use an Ethereum node (Infura, Alchemy, or similar services) to interact with the blockchain and verify NFT ownership.

  • Cross-Chain Queries:

    • Ensure compatibility with multiple chains to verify NFT ownership across different blockchains (starting with Ethereum and Polygon).

6. Success Metrics

  • Developer Adoption: Measure the number of developers integrating the "Sign in with NFT" SDK into their websites.
  • User Engagement: Track how many users successfully log in to websites using NFTs.
  • Wallet Compatibility: Ensure seamless compatibility with popular wallets (MetaMask, WalletConnect, Coinbase Wallet).
  • Security: Ensure zero security breaches or vulnerabilities in the NFT ownership and login process.

7. User Stories

As a User:

  • I want to log in to websites using my wallet and NFT without needing to create a traditional account.
  • I want to be able to control my identity through the NFTs I own and use different NFTs on different platforms.

As a Website Developer:

  • I want to easily integrate NFT-based login into my website using a simple SDK.
  • I want to specify which NFTs users need to hold to access premium features or exclusive content.

8. Timeline

  1. Phase 1 - Research and Planning (1-2 Weeks):

    • Finalize the technical specifications.
    • Choose supported blockchain networks and services (e.g., Infura, Alchemy).
    • Define user flows and security requirements.

  2. Phase 2 - SDK Development (3-4 Weeks):

    • Develop and test the front-end SDK for wallet connection and NFT ownership verification.
    • Build out wallet interactions (MetaMask, WalletConnect).
    • Create examples of front-end integrations for developers.

  3. Phase 3 - Backend Implementation (4-5 Weeks):

    • Develop the back-end challenge generation and signature verification processes.
    • Implement blockchain queries for NFT ownership.
    • Set up APIs for developers to interact with.

  4. Phase 4 - Testing and QA (2-3 Weeks):

    • Conduct end-to-end testing with real wallets and NFTs.
    • Perform security testing to ensure safe wallet interactions and NFT verification.
    • Gather feedback from developers and make necessary adjustments.

  5. Phase 5 - Launch and Documentation (2 Weeks):

    • Write detailed developer documentation for the SDK and API.
    • Launch the SDK and make it available as an open-source project on GitHub.
    • Promote the project within the Web3 and developer communities.

9. Deliverables

  1. Sign in with NFT SDK: A JavaScript SDK that developers can embed in their websites for wallet connection and NFT-based login.
  2. Backend API: A server-side solution for generating challenges, verifying signatures, and checking NFT ownership.
  3. Developer Documentation: A comprehensive guide to integrating "Sign in with NFT," covering both front-end and back-end implementations.
  4. Security Audits: Ensure that the solution passes all security checks, including preventing replay attacks and validating NFT ownership.