> You can release a hardfork, such that all participants agree to treat the offending block as a special case. No different from the Ethereum DAO fiasco.
How do you get everyone to agree to fork each time someone stores or identifies offending material (or a pointer to such) on chain?
At least in the Ethereum DAO case, everyone had a vested interest in switching to the fork.
You would need a regularly scheduled "Hard Fork Thursday" or similar to effectively address the issue, and that's quite unlikely as this introduces new vulnerabilities.
How do you get everyone to agree to fork each time someone stores or identifies offending material (or a pointer to such) on chain?
At least in the Ethereum DAO case, everyone had a vested interest in switching to the fork.
You would need a regularly scheduled "Hard Fork Thursday" or similar to effectively address the issue, and that's quite unlikely as this introduces new vulnerabilities.