Bad entropy has always cause hacks to large number of wallets, this is mostly because by users trying to randomly picking their own mnemonic words from the 2048 words, humanly selection are often not too strong randomization. Another cause of this problem is the use of online tools to generate one’s seed phrase which is said to use JavaScript instead of python. Sites like Ian Coleman’s use this JavaScript and that is why it is always best to use wallets like electrum or even bitcoin core to generate one’s seed.

Antpool In my opinion shouldn’t return the fee because that signing of message from that address doesn’t prove anything, it could be the hacker still playing his tricks.

Bottom line is one should stay from generating their own seed and also from using online tools for that. There is no reason to try and complicate things, keep it simple.

This is the classic example on how everyone should manage their wallet if they have huge amount on it. Perhaps he should used multi-sig, 2 out of 3 and it increases the security, requiring at least 2 co signers.

Unless, the hackers also got the other keys, which could be very difficult unless it's a physical attack or the 5 dollar wrench attack.

When you consider what hackers can do to steal whatever they stole, it merely makes me assume that 139 bitcoins should have been transferred, but what went to the hacker's address was roughly 55.77 bitcoins, and the remainder went to transaction fees. Those miners are quite fortunate.

Is it feasible to retrieve the 83.65 bitcoins that went to the transaction fee? This case, as far as I know, is still being investigated. Because it is still unclear whether this is a hacking event or a money-laundering conspiracy.
https://en.coin-turk.com/bitcoin-user-claims-3-1-million-fee-was-a-hack-not-an-error/

This discussion was raised by EL MOHA recently Here is the discussion link Someone just paid 83B
TC for transaction fee

Hugeblack your first and third links redirect me to the same post pls review.

The topic can be locked since it was found to already have been discussed , there's a button right at the down side of post button whereby you can see lock thread button there, this is very important to do because there's no need of making repeated topics that had been already discussed here before, the more it's been encouraged to make use of the search engine before making a thread to know if it has been discussed or not.

I am pretty sure Op did not notice them maybe because he didn't use the search button properly besides he is a newbie and such mistakes are quite common

Well if this is related to a theft I don't know why they moved the other topic to beginners and help board. Now lets say 2 people have the private key, how can you prove you are the real owner? Because I can just fake a seed phrase that produces what ever key I want, and if you can reproduce the same result on a wallet to claim that you have used to generate the key, then there is no way to prove it.

Maybe if there was a different protocol in place to double sign a transaction to allow any transfer, like signing a transaction with another key produced by a different method, but all cryptographically valid.