Lightning uses channels so maybe that's the 65 byte id? Final zaps are a nostr note with a preimage but obviously the money comes via lightning.
Yeah, that's probably it. What is a 'preimage'. In the zap reciept (NIP-57) it's a 32 byte hex code.
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It's a secret underpinning a multihop payment and if you have it as the sender it can be used as cryptographic proof of payment.
...All of which leave me guessing as to how I find out who send me a zap...
