melvincarvalho on Nostr: Brilliant idea from Peter Todd! (slightly modified by me) Possible tags to show a ...

Brilliant idea from Peter Todd! (slightly modified by me)

Possible tags to show a message was after a certain time

"after_btc_hash":"<hex block hash>"
"after_btc_block":"<numerical block height>"

A side-effect is to live checkpoint the chain

See paper: Securing Proof-of-Work Ledgers via Checkpointing

https://eprint.iacr.org/2020/173.pdf