Solidity Interface & Canonical Declaration
function unwrapWETH9(uint256 amountMinimum, address recipient) external payable
将合约内的包装以太坊（WETH9）解包为原生 ETH，并转移给指定接收者。
理论基础执行 Gas： 35,000 ~ 55,000 gas
返回值类型： void
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) | unwrapWETH9(uint256,address) 的 4 字节函数选择器 |
| 0x04 ~ 0x23 (32B) | uint256 | amountMinimum | 解包最低门槛 |
| 0x24 ~ 0x43 (32B) | address | recipient | ETH 接收者地址 |
Keccak-256 密码学哈希推导链
标准 ASCII 签名字符串： unwrapWETH9(uint256,address)
完整 256 位 Keccak 哈希： 0x49404b7cf48ec48af9fe5ff3001506c34a6f6be99dbf710f0da7da33fc9f6923
截取前 4 字节 (Big-Endian)： 0x49404b7c
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 0x49404b7c and branch
[0x0006] DUP1
[0x0007] PUSH4 0x49404b7c
[0x000c] EQ
[0x000d] PUSH2 0x0050
[0x0010] JUMPI // Jump to implementation if matched