Let`s us say that a exchange got hacked, Would there be anyway to ban those bitcoins? like blacklist the stolen coins so they cannot be used on the network? I know about going back in time with consensus of the network to a earlier block or forking and using that new chain, but could you just not ban the stolen coins? I mean make a way to do that?
I think it could not be retrieved nor blacklist those lost coins. In blockchain, tracing the lost or havked coins is impossible since there are many processes to be done. Maybe in the future we can have an advanced security on how to trace or stop those hackers.