I'd like to see them try a rollback... Even if you have 51% of the miners helping out, it's still allmost impossible.

If you have 51% of the hashrate, it's pretty easy to orphan the last couple of blocks by building a longer (more work), alternative blockchain... But at this point the "stealing"  transaction has 221!!! confirmations
(https://www.blockchain.com/btc/tx/e8b406091959700dbffcff30a60b190133721e5c39e89bb5fe23c5a554ab05ea)

This means that the last 221 blocks have to be re-created, and by the time these blocks have been re-mined, the 49% "leftover" miners will probably have mined an additional ~218 blocks... So the 51% of the miners have to re-mine those 218 blocks aswell... But by the time these blocks have been re-mined the 49% will have mined an additional ~215 blocks (so they still have the chain with the most work and the 51% have to catch up those ~215 blocks)... And so on, and so on...

Basically, even if you have 51% of the hashrate, it'll take months before your alternative chain (not including the thief's transaction) will be longer and have more work done than the chain including the thief's transaction... You'll basically invalidate 49% of the miner's blocks' and cause huge losses (not only for the miners, but also for other people that have valid transactions that are only included in the blocks mined by the 49%)... not a good situation...

I don't see an elegant sollution for this problem... This is the other side of immutability, once a transaction is confirmed, it's confirmed... You can talk all you want, but pulling off a succesfull rollback is allmost impossible.. Just imagine the cost of having to hire 51% of the miners for a couple of months, it'll be much higher than the $40.000.000 that have been stolen in the first place.

I remember the scene from Avengers where the Hulk explains that what happens in the past cannot be changed, and if it does, the future is somewhat ruined. If the rollback is done, imagine how much damage it could do to the whole bitcoin network just for the benefit of one network. It's a good thing they are no longrr vying for such action to be done because the complications can be so severe and the damage, irrepairable.

Yes and No.
Bitcoin is pseudo-anonymous. IF the hackers just keep on funding their own wallets on the bitcoin network, it's defenately possible to keep tracking untill they deposit funds on an exchange or a P2P marketplace and arrest them when they exchange their stolen funds for fiat.

HOWEVER... There are countless "tricks" that can be used to break the connection between 2 wallets. If you combine a couple of these tricks it becomes virtually impossible to keep tracking.

For example:

• The use of mixers
• Coinjoin
• Depositing and withdrawing from casino's
• Exchanging BTC to a privacy coin (like monero), moving the funds around a bit, then exchaning back

Tracking the transactions is only possible if the hackers move the found to another wallet either in bits or whole, but once the employed other techniques then it impossible cause there are so many ways to move the stollen bitcoin under the Capet without tracing. The hackers are not fools to send the money to an exchange where they can easily be court tether they will use other features just as you have mention.

Rollback would have been possible by a hard fork, under the condition of the consent of almost all miners.
Then it would create a new cryptocurrency and a "Bitcoin classic".
Fortunately, it is not likely to happen.

ethereum network tried that once before but they failed hardly, (search DAO)
this situation is just $40m and surely no miner will try that but if it happens on a $4b fund most miners and maybe all miners may accept the bribe to help the roallback and make other suffer

it is not so much about having a huge hashrate and the ability to perform such an act but the fact that this is going to create a different fork which the network is never going to agree to follow because it will kill bitcoin and turn it into a shitcoin like ethereum in one action and nobody supports that.

He can do Rollback, fork whatever with his shitcoin BNB, One cannot do Rollback on Bitcoin - The longest running chain. By talking about doing Bitcoin Rollback, CZ is embarrassing himself lol.

Have people forgot already what happens when you rollback? You make yourself look bad for everyone, you make the mockery of the blockchain ideals, which is permanence and immutability,,, hacks are meant to teach people a lesson, so please, learn your lesson. Do not think the community and miners will feel pity for you and rollback just because you were careless with security!