是否可以撤销已确认的交易？

Decentralized blockchains are immutable, meaning the data they contain cannot be changed. 交易确认并显示为成功后，无法撤销/取消交易。通常，交易确认后，即最终确定，然后添加至下一个区块。

You can only cancel a transaction while it is still pending.

We cannot revert a transaction that is already completed.

What you can do is to check with the receiver or receiving app to see if they could do anything on their side (i.e. return your funds via a new transaction).

有关一般交易的更多信息，请参阅此处。

有关如何取消或加快待处理交易的说明，请参阅此处。