A function selector calculator that helps identify different Account Abstraction (AA) implementations by their unique function signatures.

calculateSelector.ts

// calculate_function_selector.js
import { keccak256, toUtf8Bytes } from 'ethers';

function calculateFunctionSelector(functionSignature: string): string {
    const fullHash = keccak256(toUtf8Bytes(functionSignature));
    const selector = fullHash.slice(0, 10); // First 4 bytes (8 hex chars + '0x')

    console.log('Function signature:', functionSignature);
    console.log('Full Keccak256 hash:', fullHash);
    console.log('Function selector (first 4 bytes):', selector);
    console.log('—'.repeat(40));

    return selector;
}

// 1) Alchemy single execute
console.log('Alchemy single execute selector:');
calculateFunctionSelector(
    'execute(address,uint256,bytes)'
);

// 2) Alchemy batch execute
console.log('Alchemy batch execute selector:');
calculateFunctionSelector(
    'executeBatch((address,uint256,bytes)[])'
);

// 3) Alchemy execute with runtime validation
console.log('Alchemy execute with runtime validation selector:');
calculateFunctionSelector(
    'executeWithRuntimeValidation(bytes,bytes)'
);

// 4) Alchemy entry-point userOp execute
console.log('Alchemy entry-point userOp execute selector:');
calculateFunctionSelector(
    'executeUserOp((address,uint256,bytes,bytes,uint256,uint256,uint256,uint256,uint256,address,bytes),bytes32)'
);

// 5) ZeroDev kernel execute (ERC-7579)
console.log('ZeroDev kernel execute selector:');
calculateFunctionSelector(
    'execute(bytes32,bytes)'
);

// 6) Biconomy single execute
console.log('Biconomy single execute selector:');
calculateFunctionSelector(
    'execute(address,uint256,bytes)'
);

// 7) Biconomy batch execute
console.log('Biconomy batch execute selector:');
calculateFunctionSelector(
    'executeBatch(address[],uint256[],bytes[])'
);

// 8) Biconomy optimized single execute (gas-efficient)
console.log('Biconomy optimized single execute selector:');
calculateFunctionSelector(
    'execute_ncC(address,uint256,bytes)'
);

// 9) Biconomy optimized batch execute (gas-efficient)
console.log('Biconomy optimized batch execute selector:');
calculateFunctionSelector(
    'executeBatch_y6U(address[],uint256[],bytes[])'
);

// 10) SmartVault (splits) single execute
console.log('SmartVault (splits) single execute selector:');
calculateFunctionSelector(
    'execute((address,uint256,bytes))'
);

// 11) SmartVault (splits) batch execute
console.log('SmartVault (splits) batch execute selector:');
calculateFunctionSelector(
    'executeBatch((address,uint256,bytes)[])'
);