Subnostr

How can you tell who zapped you? The 'lnbc' invoice can be decoded but the pubkey within it is 65 bytes long... Wierd.

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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.

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...