Like this. Doesn't require a PR, does it?
https://github.com/nostr-protocol/nips/blob/master/39.md
Couldn't you just add a verifying message to a transaction? Nostr ordinals LOL.
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I think you could absolutely put a nostr event in an OP return.
Noster doesn't have to verify the payment, the blockchain will. The original event would have the transaction ID referenced in it.