From b1d1aca2fab928472edd9bc76c98655ae4248df3 Mon Sep 17 00:00:00 2001
From: Egge <80262989+Egge7@users.noreply.github.com>
Date: Thu, 25 May 2023 16:21:20 +0200
Subject: [PATCH] init

---
 57.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/57.md b/57.md
index cb1f126c..0e7d4f3a 100644
--- a/57.md
+++ b/57.md
@@ -178,6 +178,30 @@ When an event includes a `zap` tag, clients SHOULD calculate the lnurl pay reque
 }
 ```
 
+### Appendix H: Partially Complete Zap Receipt
+
+LNURL Servers SHOULD return a Partially complete Zap Receipt together with the payment request in step 6. This allows clients to republish the receipt to "proof" a payment has been made, even when the LNURL server fails or refuses to publish the Zap receipt. In order to stop a client from publishing the receipt without ever paying the invoice, the LNURL server removes the value of the preimage-tag before sending it back in the response, making the receipt an invalid event until the paying client has paid the invoice to discover the preimage themselves. 
+
+Example `Partially complete zap receipt`:
+
+```json
+{
+    "id": "67b48a14fb66c60c8f9070bdeb37afdfcc3d08ad01989460448e4081eddda446",
+    "pubkey": "9630f464cca6a5147aa8a35f0bcdd3ce485324e732fd39e09233b1d848238f31",
+    "created_at": 1674164545,
+    "kind": 9735,
+    "tags": [
+      ["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"],
+      ["e", "3624762a1274dd9636e0c552b53086d70bc88c165bc4dc0f9e836a1eaf86c3b8"],
+      ["bolt11", "lnbc10u1p3unwfusp5t9r3yymhpfqculx78u027lxspgxcr2n2987mx2j55nnfs95nxnzqpp5jmrh92pfld78spqs78v9euf2385t83uvpwk9ldrlvf6ch7tpascqhp5zvkrmemgth3tufcvflmzjzfvjt023nazlhljz2n9hattj4f8jq8qxqyjw5qcqpjrzjqtc4fc44feggv7065fqe5m4ytjarg3repr5j9el35xhmtfexc42yczarjuqqfzqqqqqqqqlgqqqqqqgq9q9qxpqysgq079nkq507a5tw7xgttmj4u990j7wfggtrasah5gd4ywfr2pjcn29383tphp4t48gquelz9z78p4cq7ml3nrrphw5w6eckhjwmhezhnqpy6gyf0"],
+      ["description", "{\"pubkey\":\"32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245\",\"content\":\"\",\"id\":\"d9cc14d50fcb8c27539aacf776882942c1a11ea4472f8cdec1dea82fab66279d\",\"created_at\":1674164539,\"sig\":\"77127f636577e9029276be060332ea565deaf89ff215a494ccff16ae3f757065e2bc59b2e8c113dd407917a010b3abd36c8d7ad84c0e3ab7dab3a0b0caa9835d\",\"kind\":9734,\"tags\":[[\"e\",\"3624762a1274dd9636e0c552b53086d70bc88c165bc4dc0f9e836a1eaf86c3b8\"],[\"p\",\"32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245\"],[\"relays\",\"wss://relay.damus.io\",\"wss://nostr-relay.wlvs.space\",\"wss://nostr.fmt.wiz.biz\",\"wss://relay.nostr.bg\",\"wss://nostr.oxtr.dev\",\"wss://nostr.v0l.io\",\"wss://brb.io\",\"wss://nostr.bitcoiner.social\",\"ws://monad.jb55.com:8080\",\"wss://relay.snort.social\"]]}"],
+      ["preimage", ""]
+    ],
+    "content": "",
+    "sig": "b0a3c5c984ceb777ac455b2f659505df51585d5fd97a0ec1fdb5f3347d392080d4b420240434a3afd909207195dac1e2f7e3df26ba862a45afd8bfe101c2b1cc"
+  }
+```
+
 ## Future Work
 
 Zaps can be extended to be more private by encrypting `zap request` notes to the target user, but for simplicity it has been left out of this initial draft.