Just install Knots from Bitcoin knots org and see the defaults.
If you're talking about the op_return discussion, there's a lot to read in general.
https://learnmeabitcoin.com/technical/script/return/
AVB / AVB21
npub1se…4p0l7
2025-05-06 06:24:26 UTC
in reply to nevent1q…5jmk
Author Public Key
npub1sec6degc3ae7warveuxaz6dlffnc2sutwtqjr7pmll7sf7ypjngsd4p0l7Seen on
wss://relay.nostrplebs.comPublished at
2025-05-06 06:24:26 UTCEvent JSON
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