> there are several reasons to prefer an editable blockchain, spanning from the necessity to remove inappropriate content<p>There are already blockchains that do not allow for embedding of arbitrary data, because it's all elliptic curve points and Schnorr signatures.
> <i>Redactions can be made only by authorized entities and under specific constraints</i> ...<p>This makes the network essentially centralized. Why not just use a db that is cheaper?