Uniswap V2 Automated Market Maker KECCAK-256 VERIFIED
WEB3 逆向安全工程 // UNISWAP V2 标准
0x18cbafe5

Solidity Interface & Canonical Declaration

function swapExactTokensForETH(uint256 amountIn, uint256 amountOutMin, address[] path, address to, uint256 deadline) external returns (uint256[] memory amounts)

将精确数量的 ERC-20 代币兑换为原生以太坊(ETH),并直接退还至接收者账户。

理论基础执行 Gas: 100,000 ~ 170,000 gas
返回值类型: uint256[]

Calldata 调用数据 ABI 编码布局账本

Calldata Offset Type Parameter Name Semantic Role
0x00 ~ 0x03 (4B) bytes4 Method ID (msg.sig) swapExactTokensForETH(uint256,uint256,address[],address,uint256) 的 4 字节函数选择器
0x04 ~ 0x23 (32B) uint256 amountIn 支付的代币输入量
0x24 ~ 0x43 (32B) uint256 amountOutMin 最低可接受的 ETH 输出数量(wei)
0x44 ~ 0x63 (32B) address[] path 交易路径
0x64 ~ 0x83 (32B) address to 接收 ETH 的账户
0x84 ~ 0xa3 (32B) uint256 deadline 截止时间戳

Keccak-256 密码学哈希推导链

标准 ASCII 签名字符串: swapExactTokensForETH(uint256,uint256,address[],address,uint256)
完整 256 位 Keccak 哈希: 0x18cbafe5fb6ab7d2558a55ccc138a3172aa304c3a08214c1ab07223dcb9e7f8e
截取前 4 字节 (Big-Endian): 0x18cbafe5

EVM 运行时调度器汇编代码特征 (Dispatcher Opcodes)

// 1. Load the first 32 bytes of transaction calldata [0x0000] PUSH1 0x00 [0x0002] CALLDATALOAD // 2. Right-shift by 224 bits (0xe0) to isolate the 4-byte selector [0x0003] PUSH1 0xe0 [0x0005] SHR // 3. Match against target selector 0x18cbafe5 and branch [0x0006] DUP1 [0x0007] PUSH4 0x18cbafe5 [0x000c] EQ [0x000d] PUSH2 0x0050 [0x0010] JUMPI // Jump to implementation if matched