Vic on Nostr: Kind of nifty. Users may not realize it yet, but this enables zapping of ANY ...

Kind of nifty.

Users may not realize it yet, but this enables zapping of ANY cryptocurrency token issued by the mint, not just sats.

quoting
naddr1qq…usks

# NIP-XX: Cashu Zap

A Cashu Zap is a P2PK cashu token where the payment itself is the receipt.

```js
{
kind: 7375,
content: "Thanks for the coffee",
pubkey: "sender-pubkey",
tags: [
[ "amount", "1000", "msat" ],
[ "token", "cashuAeyJ0b2tlbiI6W3sicHJvb2ZzIjpbeyJpZCI6IjAwNDE0NmJkZjRhOWFmYWIiLCJhbW91bnQiOjEsInNlY3JldCI6IltcIlAyUEtcIix7XCJub25jZVwiOlwiYjI0NDNkZDRmMDQxNjgyYjRkMmEwMzkwNGQ5MDAyNjRiNzI1MzgwZTQ0YWM0MDk2Y2EwZWE2NDAzMGY0Mjc4OFwiLFwiZGF0YVwiOlwiZTlmYmNlZDNhNDJkY2Y1NTE0ODY2NTBjYzc1MmFiMzU0MzQ3ZGQ0MTNiMzA3NDg0ZTRmZDE4MThhYjUzZjk5MTExXCJ9XSIsIkMiOiIwMjYyOTM5ODRjODg1OTFiMzA2MzUxYjY5ZmNjODAxNGQ1NTc5MmYzMTQwYWEyZDlhYmQ0NGZhOWY0Y2Y2ZmQzZjEifV0sIm1pbnQiOiJodHRwczovL3N0YWJsZW51dC51bWludC5jYXNoIn1dLCJ1bml0Ijoic2F0In0="]
[ "u", "https://stablenut.umint.cash", ],
[ "e", "" ],
[ "p", "e9fbced3a42dcf551486650cc752ab354347dd413b307484e4fd1818ab53f991" ]
]
}
```

# Recipient reactions
The recipient of the cashu zap can create a `kind:7376` zap to acknowledge the payment once it has been claimed.

```js
{
kind: 7376,
content: "Received 1000 msat",
pubkey: "e9fbced3a42dcf551486650cc752ab354347dd413b307484e4fd1818ab53f991", // recipient
tags: [
[ "amount", "1000", "msat" ],
[ "e", "", "relay-hint", "root" ],
[ "e", "<7375-zap-id>", "relay-hint", "zap" ],
[ "p", "sender-pubkey" ]
]
}
```

## Verifying a Cashu Zap
* Clients MIGHT check that the receiving user has issued a `kind:38000` (cashu mint recommendation event) `u`-tagging the mint where the cashu has been minted.
* Clients MIGHT check that the token is locked to the user's pubkey.

Token payload:
```js
{
proofs: [
{
id: '004146bdf4a9afab',
amount: 1,
secret: '["P2PK",{"nonce":"b2443dd4f041682b4d2a03904d900264b725380e44ac4096ca0ea64030f42788","data":"e9fbced3a42dcf551486650cc752ab354347dd413b307484e4fd1818ab53f99111"}]',
C: '026293984c88591b306351b69fcc8014d55792f3140aa2d9abd44fa9f4cf6fd3f1'
}
],
mint: 'https://stablenut.umint.cash'
}
```