...Sender();
// `allowance` mapping gets updated for
// the spender and amount on behalf of the owner.
_approve(owner, spender, value);
return true;
}
```
这种方法很简单，但转移资金需要两个交易，这很麻烦。此外，对于与许多 dApp 互动的用户...
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图：TOP 5 Stablecoin's Market Cap、Volume and Circulating Supply. Data as of 2023/12/28
图：USDT近30天交易量、成交笔数、用户数，data as of 2023/12/28
![im...