EIP-7702 Support: Coming to Luntra Infrastructure
Overview
Luntra Infrastructure is excited to announce our upcoming support for EIP-7702: Set EOA account code for one transaction, which will bring native account abstraction capabilities to our rollup chain. This groundbreaking feature will allow Externally Owned Accounts (EOAs) to temporarily act as smart contract accounts during transaction execution, unlocking powerful new use cases while maintaining backward compatibility.
What is EIP-7702?
EIP-7702 introduces a new transaction type that enables EOAs to delegate their account behavior to smart contract code for the duration of a single transaction. This creates a hybrid approach where regular wallet addresses can execute complex smart contract logic without permanently converting to contract accounts.
Key Benefits for Luntra Users
Enhanced User Experience
Batch Operations: Execute multiple actions in a single transaction
Gas Optimization: Reduce transaction costs through efficient batching
Flexible Authentication: Support for custom signature schemes and multi-sig workflows
Sponsored Transactions: Enable gasless transactions through meta-transactions
Developer-Friendly Features
Programmable Wallets: Transform any EOA into a programmable account temporarily
Custom Logic: Implement complex validation rules and execution patterns
Seamless Integration: Works with existing wallet infrastructure
Backward Compatibility: Standard EOA functionality remains unchanged
Technical Implementation
Transaction Structure
Our rollup implements EIP-7702 transactions with the following structure:
TransactionType: 0x04 (EIP-7702)
Fields:
- chain_id: Our rollup's chain identifier
- nonce: Account nonce
- max_priority_fee_per_gas: Priority fee
- max_fee_per_gas: Maximum gas fee
- gas_limit: Gas limit for execution
- to: Target address (can be null for contract creation)
- value: ETH value to transfer
- data: Transaction data
- access_list: EIP-2930 access list
- authorization_list: List of authorization objects
- signature_y_parity, signature_r, signature_s: Transaction signatureAuthorization Object Format
Each authorization in the authorization_list contains:
Authorization:
- chain_id: Target chain ID (must match our rollup)
- address: Code address to delegate to
- nonce: Authorizing account's nonce
- y_parity, r, s: Authorization signaturePre-execution: Temporarily set EOA code to authorized contract code
Execution: Process transaction with delegated smart contract logic
Post-execution: Restore original EOA state (empty code)
Use Cases Enabled
1. Batch Transactions
Users can combine multiple operations into a single transaction:
Token swaps + staking in one transaction
Multi-token transfers
Complex DeFi operations
2. Gasless Transactions
Enable sponsored transactions where:
DApps pay gas fees for users
Meta-transaction patterns become native
Improved onboarding experience
3. Enhanced Security
Custom validation logic
Multi-signature requirements
Time-locked operations
Spending limits and controls
4. Wallet Upgrades
Add new features to existing wallets
Implement recovery mechanisms
Social recovery patterns
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