Does nostr have any plan to implement some timestamp verification? Without a use of a trusted timestamping server. I've seen some implementations that use the bitcoin blockchain where a transaction containing the document signature is committed and the timestamp of the block is used as a proof. It isn't perfect as bitcoin allows timestamps to vary by 2 hours (i think) and also transaction can get stuck if fees rise. Also such transactions can spam the blockchain. But I also think that the last two problems can be mitigated by aggregating many signatures in a single transaction using a merkle tree.

Are there suggestions for reliable decentralized timestamping?