Subnostr

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

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.

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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...