strip signatures is an interesting one

the farcaster protocol has a signature system whereby the signature is delegated via the hub you post to, you can't verify it unless you can get the hub's pubkey directory and find the key

i dunno if it really changes anything except making the event questionable...

ah yes, and repudiation has a benefit here, if the key were revoked before the date of the event it could be surmised that a compromise has occurred