Hmm, does Lightning have a way to prove you sent sats?

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No. It isn't proof that a payment happened though.

I heard other Nostr clients post two notes per zap but that part appears to be missing from Amethyst (Android)?

There should probably be a way to prove.🤔

There is no way to prove a LN payment or a LN channel balance to a third party without closing the channel.

Even if you set it up that way intentionally? What if you route through a server designed to confirm the payment?

Seems like a major flaw... What if Amazon wanted to let you pay the merchant directly, but still handled order confirmation and delivery?

lnbc10u1p37ahmapp5fkuve8xyce2kuqwynq0slyuujuuuxzua8a6lrvj2ehgfeyme8rvqdqu2askcmr9wssx7e3q2dshgmmndp5scqzpgxqyz5vqsp5ymau0v804wzkr33ftj0x85dp0f2qe387w65l4vee3ddsx7vjd2lq9qyyssqjfskka23vahflc49d32cz6x73tx4ftne9u0xw94aylr6yx9v24jkdmrhzfunedpf3xc4anajv0hm5jnlfcnu9chvk0egkm60rtpk9rqpk3zpuu

the receiver needs to have a wallet that supports sending receipts for it to appear on nostr.

The gears are already turning I see! Love it 🤙🏻

not yet to prove you sent them but that a given invoice was acknowledged as paid

Lightning native yes, so if you need to prove a payment, better use an invoice like this instead of doing a "zap" (a tip)

lnbc12340n1p37ahtypp5vwk7pewqa7uxxwcpvlylea837hxtffec8mpunrdzyjufyl6nwwssdqqcqzpgxqyz5vqsp5ts2hwwl8cc32769dth0w0794n9zyknpvpf63xwgy754djpmqg83s9qyyssqt2jclvtlzf8ul77haryhtwjhhxslnhcrw4t02e79c07jcwytlekrz995ck79sy6l4ndwgnfnyvrhqlfnfdm0gcwq58qfnv4jnep57kgqrtmd9p

(The Preimage of the invoice proves the payment)