EIP-5792

📜 EIP-5792: Wallet Contract Interface

EIP-5792 introduces a standard interface for wallet contracts in the Ethereum ecosystem. This page provides a comprehensive overview of its architecture, core concepts, user flow, and implementation details.

🏗️ Architecture

The EIP-5792 standard defines a set of interfaces and functionalities for wallet contracts. Here's a high-level overview of the architecture:

🧠 Core Concepts

1. Wallet Contract 👛

A smart contract that implements the EIP-5792 interface, allowing it to act as a programmable wallet with advanced features.

2. Signature Validation ✅

The ability to verify signatures, enabling secure transaction authorization.

3. Transaction Execution 🚀

Methods for executing single and batch transactions, providing flexibility in wallet operations.

4. Nonce Management 🔢

A mechanism to prevent replay attacks and ensure transaction uniqueness.

🚶 User Flow

Here's a typical user flow for interacting with an EIP-5792 wallet contract:

💻 Implementation Details

Wallet Contract Interface

interface IERC5792 {
    function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
    function executeCall(address to, uint256 value, bytes memory data) external payable returns (bytes memory);
    function executeBatch(address[] memory to, uint256[] memory value, bytes[] memory data) external payable returns (bytes[] memory);
    function nonce() external view returns (uint256);
}

Example Implementation

Here's a basic implementation of an ERC-5792 Wallet Contract:

pragma solidity ^0.8.0;

import "./IERC5792.sol";

contract ERC5792Wallet is IERC5792 {
    address public owner;
    uint256 private _nonce;

    constructor(address _owner) {
        owner = _owner;
    }

    function isValidSignature(bytes32 hash, bytes memory signature) external view override returns (bytes4 magicValue) {
        if (recoverSigner(hash, signature) == owner) {
            return 0x1626ba7e; // EIP-1271 magic value
        }
        return 0xffffffff;
    }

    function executeCall(address to, uint256 value, bytes memory data) external payable override returns (bytes memory) {
        require(msg.sender == owner, "Not authorized");
        _nonce++;
        (bool success, bytes memory result) = to.call{value: value}(data);
        require(success, "Call failed");
        return result;
    }

    function executeBatch(address[] memory to, uint256[] memory value, bytes[] memory data) external payable override returns (bytes[] memory) {
        require(msg.sender == owner, "Not authorized");
        require(to.length == value.length && to.length == data.length, "Array length mismatch");
        _nonce++;
        bytes[] memory results = new bytes[](to.length);
        for (uint256 i = 0; i < to.length; i++) {
            (bool success, bytes memory result) = to[i].call{value: value[i]}(data[i]);
            require(success, "Call failed");
            results[i] = result;
        }
        return results;
    }

    function nonce() external view override returns (uint256) {
        return _nonce;
    }

    function recoverSigner(bytes32 hash, bytes memory signature) internal pure returns (address) {
        require(signature.length == 65, "Invalid signature length");
        bytes32 r;
        bytes32 s;
        uint8 v;
        assembly {
            r := mload(add(signature, 32))
            s := mload(add(signature, 64))
            v := byte(0, mload(add(signature, 96)))
        }
        if (v < 27) v += 27;
        require(v == 27 || v == 28, "Invalid signature 'v' value");
        return ecrecover(hash, v, r, s);
    }
}

🔑 Key Features

• 🔐 Secure signature validation for transaction authorization

• 🚀 Flexible execution of single and batch transactions

• 🔢 Nonce management to prevent replay attacks

• 🔌 Interoperability with existing Ethereum infrastructure

• 🧩 Extensibility for custom wallet implementations

EIP-5792 provides a robust framework for creating standardized wallet contracts, enabling developers to build sophisticated and secure wallet solutions. This standard paves the way for more user-friendly and feature-rich blockchain applications while maintaining high levels of security and flexibility.