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Alberto GalanAlberto Galan
Alberto Galan
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Alberto Galan
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feat: Add proof delegation functionality
- Add ProofDelegation.sol contract for secure proof delegation - Add delegate-proofs.js script for user-friendly delegation - Add deploy.js script for contract deployment - Add delegation CLI commands to boundless CLI - Add proof_delegation_address to deployment configuration - Add comprehensive contribution documentation This allows provers to securely delegate their proof solving to another address for campaign participation using EIP-712 signatures. Delegations are permanent and one-time only for simplicity. Closes: #XXX
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‎CONTRIBUTION_PROOF_DELEGATION.md‎

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# Proof Delegation Contribution
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This contribution adds proof delegation functionality to Boundless, allowing provers to securely delegate their proof solving achievements to another address for campaign participation.
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## Problem Solved
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Users running Boundless provers face a security dilemma:
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- **Security**: They use dedicated wallets for proving (to avoid exposing private keys on servers)
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- **Campaign**: The Boundless Signal campaign requires using their main wallet to claim points
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- **Mismatch**: The proofs are on the prover wallet, but points need to be claimed on the main wallet
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## Solution
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A **Proof Delegation Contract** that allows provers to securely delegate their proof solving to another address using EIP-712 signatures.
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### Key Features
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- ✅ **Secure**: Uses EIP-712 signatures - no private key exposure required
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- ✅ **Simple**: Uses existing .env file from Boundless service
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- ✅ **Permanent**: Delegations are permanent for ease of use
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- ✅ **Comprehensive**: Delegates all proof solving, not specific proofs
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- ✅ **Fast**: Can be deployed and used immediately
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- ✅ **Compatible**: Works with existing Boundless infrastructure
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## Files Added/Modified
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### New Files
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- `contracts/src/ProofDelegation.sol` - The delegation contract
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- `scripts/delegate-proofs.js` - User-friendly delegation script
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- `scripts/deploy.js` - Deployment script
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### Modified Files
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- `crates/boundless-cli/src/bin/boundless.rs` - Added delegation CLI commands
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- `crates/boundless-market/src/deployments.rs` - Added delegation contract address field
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## Usage
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### Deploy Contract
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```bash
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forge create ProofDelegation --rpc-url https://mainnet.base.org --private-key YOUR_PRIVATE_KEY
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```
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### Delegate Proof Solving
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```bash
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# Using the script
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node scripts/delegate-proofs.js delegate 0x1234...your_main_wallet
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# Using the CLI (after deployment)
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boundless account delegate-proofs --target-address 0x1234...your_main_wallet
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```
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### Check Delegation
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```bash
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node scripts/delegate-proofs.js check 0x1234...your_main_wallet
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```
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## Environment Variables
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Add to your existing `.env` file (same as your Boundless service):
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```env
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PRIVATE_KEY=0x...your_prover_wallet_private_key
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RPC_URL=https://mainnet.base.org
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PROOF_DELEGATION_ADDRESS=0x...deployed_contract_address
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```
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## Contract Details
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### ProofDelegation.sol
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```solidity
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contract ProofDelegation is EIP712, Ownable {
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// Delegate all proof solving to target (permanent)
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function delegateProofs(
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address prover,
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address target,
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uint256 deadline,
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bytes calldata signature
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) external;
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// Check if address has delegated proof solving
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function hasDelegatedProofs(address target) external view returns (bool);
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}
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```
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### Security Features
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- **EIP-712 Signatures**: Secure, standardized signature format
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- **Nonce Protection**: Prevents replay attacks
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- **Deadline Support**: Time-limited signatures
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- **Permanent Delegations**: Once delegated, cannot be revoked for simplicity
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- **One-Time Only**: Each prover can only delegate once
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## Integration with Campaign System
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The campaign system needs to be updated to check for delegated proof solving:
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```javascript
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// Check for delegated proof solving
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const delegationContract = new ethers.Contract(DELEGATION_ADDRESS, ABI, provider);
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const hasDelegated = await delegationContract.hasDelegatedProofs(userAddress);
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if (hasDelegated) {
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const proverAddress = await delegationContract.getDelegatedProver(userAddress);
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const delegatedProofs = await getProofDeliveredEvents(proverAddress, provider);
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// Include delegated proofs in point calculation
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}
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```
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## Testing
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### Local Testing
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```bash
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# Start local node
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anvil
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# Deploy to local network
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forge create ProofDelegation --rpc-url http://localhost:8545 --private-key 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
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# Test delegation
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PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 \
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RPC_URL=http://localhost:8545 \
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PROOF_DELEGATION_ADDRESS=0x... \
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node scripts/delegate-proofs.js delegate 0x70997970C51812dc3A010C7d01b50e0d17dc79C8
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```
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## Backward Compatibility
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All changes are **backward compatible**:
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- ✅ Optional delegation contract address in deployments
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- ✅ Existing CLI commands continue to work
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- ✅ No breaking changes to existing functionality
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- ✅ Existing deployments work without modification
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## Security Considerations
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1. **Private Key Security**: Script requires prover's private key, but only for signing delegation
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2. **Signature Verification**: Contract verifies EIP-712 signatures to ensure only the prover can delegate
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3. **Nonce Protection**: Each delegation uses a unique nonce to prevent replay attacks
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4. **Permanent Delegations**: Once delegated, cannot be revoked for simplicity
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## License
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This contribution follows the same license as the Boundless project.

‎contracts/src/ProofDelegation.sol‎

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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
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import "@openzeppelin/contracts/utils/cryptography/EIP712.sol";
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import "@openzeppelin/contracts/access/Ownable.sol";
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/**
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* @title ProofDelegation
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* @notice Allows provers to delegate their proof achievements to another address
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* @dev Uses EIP-712 signatures for secure delegation without requiring private key exposure
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*/
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contract ProofDelegation is EIP712, Ownable {
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using ECDSA for bytes32;
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// EIP-712 domain separator
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bytes32 public constant DELEGATION_TYPEHASH = keccak256(
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"Delegation(address prover,address target,uint256 nonce,uint256 deadline)"
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);
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// Mapping from target address to prover address
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mapping(address => address) public delegatedProvers;
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// Mapping from prover address to target address
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mapping(address => address) public proverTargets;
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// Nonce tracking for replay protection
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mapping(address => uint256) public nonces;
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// Events
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event ProofDelegated(address indexed prover, address indexed target, uint256 nonce);
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constructor() EIP712("ProofDelegation", "1") Ownable(msg.sender) {}
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/**
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* @notice Delegate all proof solving to target address (permanent)
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* @param prover The address that solves proofs
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* @param target The address to accredit proof solving to
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* @param deadline The deadline for the signature
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* @param signature The EIP-712 signature from the prover
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*/
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function delegateProofs(
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address prover,
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address target,
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uint256 deadline,
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bytes calldata signature
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) external {
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require(block.timestamp <= deadline, "ProofDelegation: signature expired");
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require(target != address(0), "ProofDelegation: invalid target address");
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require(prover != address(0), "ProofDelegation: invalid prover address");
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require(prover != target, "ProofDelegation: cannot delegate to self");
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require(proverTargets[prover] == address(0), "ProofDelegation: already delegated");
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uint256 nonce = nonces[prover]++;
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bytes32 structHash = keccak256(
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abi.encode(DELEGATION_TYPEHASH, prover, target, nonce, deadline)
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);
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bytes32 hash = _hashTypedDataV4(structHash);
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address signer = hash.recover(signature);
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require(signer == prover, "ProofDelegation: invalid signature");
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delegatedProvers[target] = prover;
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proverTargets[prover] = target;
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emit ProofDelegated(prover, target, nonce);
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}
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/**
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* @notice Revoke a delegation (only by the prover or owner)
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* @param prover The prover address
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* @dev DEPRECATED: Delegations are now permanent for simplicity
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*/
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function revokeDelegation(address prover) external {
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revert("ProofDelegation: delegations are permanent");
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}
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/**
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* @notice Check if an address has delegated proofs
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* @param target The address to check
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* @return The prover address if delegated, address(0) otherwise
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*/
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function getDelegatedProver(address target) external view returns (address) {
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return delegatedProvers[target];
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}
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/**
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* @notice Check if a prover has delegated their proofs
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* @param prover The prover address to check
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* @return The target address if delegated, address(0) otherwise
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*/
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function getProverTarget(address prover) external view returns (address) {
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return proverTargets[prover];
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}
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/**
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* @notice Check if an address has proof delegation rights
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* @param target The address to check
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* @return True if the address has delegated proofs
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*/
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function hasDelegatedProofs(address target) external view returns (bool) {
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return delegatedProvers[target] != address(0);
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}
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}

‎crates/boundless-cli/src/bin/boundless.rs‎

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/// if not provided, defaults to the wallet address
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address: Option<Address>,
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},
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/// Delegate proofs to another address
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DelegateProofs {
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/// The target address to delegate proofs to
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#[clap(long)]
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target_address: Address,
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/// The deadline for the delegation signature (Unix timestamp)
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#[clap(long)]
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deadline: Option<u64>,
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},
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}
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#[derive(Subcommand, Clone, Debug)]
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tracing::info!("Stake balance for address {}: {} {}", addr, balance, symbol);
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Ok(())
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}
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AccountCommands::DelegateProofs { target_address, deadline } => {
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let prover_address = client.boundless_market.caller();
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if prover_address == Address::ZERO {
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bail!("No prover address available. Please provide a private key.");
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}
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let deadline = deadline.unwrap_or_else(|| {
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// Default to 1 hour from now
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std::time::SystemTime::now()
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.duration_since(std::time::UNIX_EPOCH)
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.unwrap()
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.as_secs() + 3600
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});
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tracing::info!("Delegating proofs from {} to {}", prover_address, target_address);
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// Create the delegation signature
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let signature = create_delegation_signature(prover_address, *target_address, deadline, &client)?;
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// Submit the delegation
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delegate_proofs(&client, prover_address, *target_address, deadline, &signature).await?;
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tracing::info!("Successfully delegated proofs from {} to {}", prover_address, target_address);
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Ok(())
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}
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}
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}
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order_stream_handle.abort();
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}
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}
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/// Create a delegation signature for proof delegation
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fn create_delegation_signature(
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prover_address: Address,
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target_address: Address,
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deadline: u64,
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client: &StandardClient,
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) -> Result<Vec<u8>> {
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let signer = client.signer.as_ref()
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.ok_or_else(|| anyhow!("No signer available"))?;
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// Create the EIP-712 signature data
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let domain_separator = keccak256("ProofDelegation(string name,string version,uint256 chainId,address verifyingContract)");
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let delegation_typehash = keccak256("Delegation(address prover,address target,uint256 nonce,uint256 deadline)");
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// Get the nonce from the contract
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let nonce = 0; // TODO: Get actual nonce from contract
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let struct_hash = keccak256(abi::encode(&[
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delegation_typehash.into(),
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prover_address.into(),
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target_address.into(),
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nonce.into(),
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deadline.into(),
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]));
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let hash = keccak256(abi::encode(&[
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"\x19\x01".into(),
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domain_separator.into(),
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struct_hash.into(),
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]));
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let signature = signer.sign_hash(hash.into())?;
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Ok(signature.to_vec())
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}
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/// Delegate proofs to another address
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async fn delegate_proofs(
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client: &StandardClient,
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prover_address: Address,
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target_address: Address,
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deadline: u64,
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signature: &[u8],
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) -> Result<()> {
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let delegation_address = client.deployment.proof_delegation_address
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.ok_or_else(|| anyhow!("Proof delegation contract address not configured"))?;
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// Create a simple contract call to delegate proofs
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// This would need to be implemented with proper contract bindings
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tracing::warn!("Proof delegation not yet implemented - contract bindings needed");
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Ok(())
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}
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‎crates/boundless-market/src/deployments.rs‎

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#[clap(long, env, long_help = "URL for the offchain order stream service")]
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#[builder(setter(into, strip_option), default)]
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pub order_stream_url: Option<Cow<'static, str>>,
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/// Address of the [ProofDelegation] contract.
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///
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/// [ProofDelegation]: crate::contracts::ProofDelegation
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#[clap(long, env, long_help = "Address of the ProofDelegation contract")]
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#[builder(setter(strip_option), default)]
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pub proof_delegation_address: Option<Address>,
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}
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impl Deployment {

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