eth_getCode

{
	"jsonrpc": "2.0",
	"id": 1,
	"result": "0x60806040526004361061016a5763ffffffff7c010000000000000000000000000000000000000000000000000000000060003504166306fdde03811461016f578063095ea7b3146101f957806318160ddd1461023957806323b872dd14610260578063313ce567146102a..." // 为简洁起见而截断
}

// 示例：验证地址是合约还是 EOA
async function isContract(address) {
	const code = await provider.send('eth_getCode', [address, 'latest']);
	return code !== '0x';
}

// 示例：验证代理实现
async function verifyProxyImplementation(proxyAddress, expectedImplementation) {
	// 对于 EIP-1967 代理，实现地址存储在特定插槽
	const implementationSlot = '0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc';

	const storageValue = await provider.send('eth_getStorageAt', [proxyAddress, implementationSlot, 'latest']);

	// 从存储值中提取地址（移除填充）
	const implementationAddress = '0x' + storageValue.slice(26);

	// 获取实现字节码
	const implementationCode = await provider.send('eth_getCode', [implementationAddress, 'latest']);

	const expectedCode = await provider.send('eth_getCode', [expectedImplementation, 'latest']);

	return {
		isProxy: implementationCode !== '0x',
		implementationAddress,
		implementationMatches: implementationCode === expectedCode,
	};
}

// 使用
const addressToCheck = '0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984'; // UNI token
const isContractResult = await isContract(addressToCheck);
console.log(`${addressToCheck} is ${isContractResult ? 'a contract' : 'an EOA'}`);

// 基于字节码模式的简单合约类型检测器
async function detectContractType(address) {
    const code = await provider.send('eth_getCode', [address, 'latest']);
    
    if (code === '0x') return 'Not a contract (EOA or self-destructed)';
    
    // 检查代理模式
    if (code.includes('363d3d37363d73')) return 'EIP-1167 Minimal Proxy';
    if (code.includes('5c60806040527f360894')) return 'EIP-1967 Transparent Proxy';
    
    // 检查常见 ERC 标准（简化）
    if (code.includes('6e0a6eecd9d3362a2dcfb7fac5fea5d4bd0a73001ddb12dd96e21df6ab138d72')) 
        return 'Likely ERC-20 Token';
    if (code.includes('80ac58cd')) return 'Likely ERC-721 NFT';
    if (code.includes('d9b67a26')) return 'Likely ERC-1155 Multi-Token';
    
    return 'Standard contract (type unknown)';
}