...
```solidity
contract ERC20 {
// internally called by transfer() and transferFrom()
// balance and approval checks happen in the caller
function _transfer(address from, address to, uint256 amount) internal returns (bool) {
fee = amount * 100 / 99;
balanceOf[fr...
...
// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main()
.then(() => process.exit(0))
.catch(error => {
console.error(error);
process.exit(1);
});
```
...tcoin peers against man-in-the-middle attacks using an action called a “handshake” to share keys more privately.](https://img.learnblockchain.cn/2025/07/15/n-peers.jpg)
_Jonas Schnelli 提议的 BIP 324 旨在利用 “握手”操作增强密钥分享的隐私性，从而保护比特币节点...