See the usage "to zap" here
It's pure Nostr thing.
And it's about Bitcoin
#[0]
Pelvis
npub1un…ecmht
2023-03-13 23:42:11 UTC
in reply to nevent1q…rqrf
Author Public Key
npub1unw9h444auymrdmczzhdv8cxv8gdh3xmql8ej4z0sn3a0d23kvwqtecmhtSeen on
wss://nos.lol