前几天，我看到我的metamask钱包的一个账号里多出来685GRT，价值大约400美刀，我还纳闷呢，然后想到我曾经拿600多个GRT去delegate过，但是才抵押了一个月，怎么会有这么多回馈呢？我也没多想，以为自己搞错了抵押奖励机制。 还思索着以后去多抵押一些，这也太合算了。 一个月100%回报率，哪里去找这样的投资呢？

今天早晨，杯具了，发现那个账号的GRT被清空了，我大吃一惊，赶紧去ethscan上查看，大家看看这条记录：
https://etherscan.io/token/0xc944e90c64b2c07662a292be6244bdf05cda44a7?a=0x8e6ae70eab3e420d066f18c0fceca788085f8826

这人从账号“0x8e6ae70eab3e420d066f18c0fceca788085f8826” 转入转出，如入无人之境：

![image.png](https://images.hive.blog/DQmdAiqREQKH4s4veBGpB26aETSj9FsLtzanYxF7VAWjE2R/image.png)


最令我惊讶的是，这笔交易居然没有手续费（gas）：

![image.png](https://images.hive.blog/DQmNwSTbRcUnutpYa16SyNT9aCXi7zUkW5Db3iFNQ2Won2p/image.png)

账号被黑，我可以理解，我自己做了傻事，我写了个智能合约放到github上了，然后这个代码里有我的私钥和公钥。但是transfer不收交易费，我就纳闷了。我把这个事情放到discord里去问，然后就有人回答了：

>Unfortunately, it looks like your wallet was compromised. A transaction was confirmed coming from your account interacting with the contract, and a transaction originating from an account has to be signed by the associated private key for the block to be accepted by the network.
>
>As for the no transaction fee, either the thief is a miner, or uses a service where you pay and send your transaction to miners directly instead of paying on the blockchain.
[1:01 PM]
>Sorry that this happened to you. It really sucks :/

居然还有这种操作，可以把gas费直接给矿工？矿工不是要竞争才能打包区块吗，然后才能拿到交易费吗？于是我又问了：

>one more question I just thought,  miners will compete to pack block then get transaction fee, how could people pay a miner upfront ?

然后又得到了回答，太让我震惊了，不是我不明白，这世界变化快：

>I'm not sure exactly how it works, but I know for sure such options exist. They are mostly for frontrunning bots and whales avoiding frontrunning bots as far as I know

有具体明白的大侠望回帖解释下。谢谢。

这个教训就是：以后一定要把开发用的钱包跟实际要使用的钱包分离开来，不要随便动用实际使用的mainnet上钱包。