Solidity Interface & Canonical Declaration
function safeTransferFrom(address from, address to, uint256 tokenId, bytes data) external
携带附加任意数据字节安全划转 NFT，附加数据将在接收方合约钩子中传递解析。
理论基础执行 Gas： 48,000 ~ 95,000 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) | safeTransferFrom(address,address,uint256,bytes) 的 4 字节函数选择器 |
| 0x04 ~ 0x23 (32B) | address | from | NFT 当前所有者地址 |
| 0x24 ~ 0x43 (32B) | address | to | NFT 接收者地址 |
| 0x44 ~ 0x63 (32B) | uint256 | tokenId | NFT 标识符 |
| 0x64 ~ 0x83 (32B) | bytes | data | 传递给接收方合约的附加任意数据 |
Keccak-256 密码学哈希推导链
标准 ASCII 签名字符串： safeTransferFrom(address,address,uint256,bytes)
完整 256 位 Keccak 哈希： 0xb88d4fde60196325a28bb7f99a2582e0b46de55b18761e960c14ad7a32099465
截取前 4 字节 (Big-Endian)： 0xb88d4fde
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 0xb88d4fde and branch
[0x0006] DUP1
[0x0007] PUSH4 0xb88d4fde
[0x000c] EQ
[0x000d] PUSH2 0x0050
[0x0010] JUMPI // Jump to implementation if matched