Another problem with that; time. You publish the key after you sign and post the message in question. It's tough to prove 100% but you're only really invalidati

Another problem with that; time. You publish the key after you sign and post the message in question. It's tough to prove 100% but you're only really invalidating posts from after the date you publish the private key. It also doesn't solve another part of the problem with append-only, accidental oversharing. Even if we take this 'publish the keys' process as actually working the data is still out there so if you publish info you shouldn't like locations or PII it's always out there.