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canvas-website/backlog/tasks/task-007 - Web3-Wallet-Link...

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id title status assignee created_date updated_date labels dependencies priority
task-007 Web3 Wallet Linking & Blockchain Integration In Progress
2025-12-03 2026-01-02 16:14
feature
web3
blockchain
high

Description

Integrate Web3 wallet capabilities to enable CryptID users to link EOA wallets and Safe multisigs for on-chain transactions, voting (Snapshot), and token-gated features.

Architecture Overview

CryptID uses ECDSA P-256 (WebCrypto), while Ethereum uses secp256k1. These curves are incompatible, so we use a wallet linking approach rather than key reuse.

Core Concept

  1. CryptID remains the primary authentication layer (passwordless)
  2. Users can link one or more Ethereum wallets to their CryptID
  3. Linking requires signing a verification message with the wallet
  4. Linked wallets enable: transactions, voting, token-gating, NFT features

Tech Stack

  • wagmi v2 + viem - Modern React hooks for wallet connection
  • WalletConnect v2 - Multi-wallet support (MetaMask, Rainbow, etc.)
  • Safe SDK - Multisig wallet integration
  • Snapshot.js - Off-chain governance voting

Implementation Phases

Phase 1: Wallet Linking Foundation (This Task)

  • Add wagmi/viem/walletconnect dependencies
  • Create linked_wallets D1 table
  • Implement wallet linking API endpoints
  • Build WalletLinkPanel UI component
  • Display linked wallets in user settings

Phase 2: Snapshot Voting (Future Task)

  • Integrate Snapshot.js SDK
  • Create VotingShape for canvas visualization
  • Implement vote signing flow

Phase 3: Safe Multisig (Future Task)

  • Safe SDK integration
  • TransactionBuilderShape for visual tx composition
  • Collaborative signing UI

Phase 4: Account Abstraction (Future Task)

  • ERC-4337 smart wallet with P-256 signature validation
  • Gasless transactions via paymaster

Acceptance Criteria

  • #1 Install and configure wagmi v2, viem, and @walletconnect/web3modal
  • #2 Create linked_wallets table in Cloudflare D1 with proper schema
  • #3 Implement POST /api/wallet/link endpoint with signature verification
  • #4 Implement GET /api/wallet/list endpoint to retrieve linked wallets
  • #5 Implement DELETE /api/wallet/unlink endpoint to remove wallet links
  • #6 Create WalletConnectButton component using wagmi hooks
  • #7 Create WalletLinkPanel component for linking flow UI
  • #8 Add wallet section to user settings/profile panel
  • #9 Display linked wallet addresses with ENS resolution
  • #10 Support multiple wallet types: EOA, Safe, Hardware
  • #11 Add wallet connection state to AuthContext
  • #12 Write tests for wallet linking flow
  • #13 Update CLAUDE.md with Web3 architecture documentation

Implementation Plan

Implementation Plan

Step 1: Dependencies & Configuration

npm install wagmi viem @tanstack/react-query @walletconnect/web3modal

Configure wagmi with WalletConnect projectId and supported chains.

Step 2: Database Schema

Add to D1 migration:

  • linked_wallets table (user_id, wallet_address, wallet_type, chain_id, verified_at, signature_proof, ens_name, is_primary)

Step 3: API Endpoints

Worker routes:

  • POST /api/wallet/link - Verify signature, create link
  • GET /api/wallet/list - List user's linked wallets
  • DELETE /api/wallet/unlink - Remove a linked wallet
  • GET /api/wallet/verify/:address - Check if address is linked to any CryptID

Step 4: Frontend Components

  • WagmiProvider wrapper in App.tsx
  • WalletConnectButton - Connect/disconnect wallet
  • WalletLinkPanel - Full linking flow with signature
  • WalletBadge - Display linked wallet in UI

Step 5: Integration

  • Add linkedWallets to Session type
  • Update AuthContext with wallet state
  • Add wallet section to settings panel

Step 6: Testing

  • Unit tests for signature verification
  • Integration tests for linking flow
  • E2E test for full wallet link journey

Implementation Notes

Planning Complete (2026-01-02)

Comprehensive planning phase completed:

Created Architecture Document (doc-001)

  • Full technical architecture for wallet linking
  • Database schema design
  • API endpoint specifications
  • Library comparison (wagmi/viem recommended)
  • Security considerations
  • Frontend component designs

Created Migration File

  • worker/migrations/002_linked_wallets.sql
  • Tables: linked_wallets, wallet_link_tokens, wallet_token_balances
  • Proper indexes and foreign keys

Created Follow-up Tasks

  • task-060: Snapshot Voting Integration
  • task-061: Safe Multisig Integration
  • task-062: Account Abstraction Exploration

Key Architecture Decisions

  1. Wallet Linking approach (not key reuse) due to P-256/secp256k1 incompatibility
  2. wagmi v2 + viem for frontend (React hooks, tree-shakeable)
  3. viem for worker (signature verification)
  4. EIP-191 personal_sign for EOA verification
  5. ERC-1271 for Safe/contract wallet verification (future)

Next Steps

  1. Install dependencies: wagmi, viem, @tanstack/react-query, @web3modal/wagmi
  2. Run migration on D1
  3. Implement API endpoints in worker
  4. Build WalletLinkPanel UI component