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Make description_hash verification optional

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https://njump.me/nevent1qyw8wumn8ghj7cn4vd4k2apwvdhhyctrd3jjuum0vd5kzmp0qy88wumn8ghj7mn0wvhxcmmv9uq3samnwvaz7tmrv4kxcctj9ehx7um5wgh8w6twv5hsz3thwden5te0v33rgetxda382uejd9k8garhx4nk76mrwa3kkvm0dd3hydphxe58z6md09ckgat009ukgmr0xf4rw6tfvajks6mevshxcmmrv9kz7qgnwaehxw309ahkvenrdpskjm3wwp6kytcqyznz66q53w6tqa38w2088z7028jcvelnvpl3dcv9c3pmnq0ay44nzjc7wxd
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@ -132,7 +132,7 @@ The following should be true of the `zap receipt` event:
- `tags` MUST include the `p` tag (zap recipient) AND optional `e` tag from the `zap request` AND optional `a` tag from the `zap request` AND optional `P` tag from the pubkey of the zap request (zap sender).
- The `zap receipt` MUST have a `bolt11` tag containing the description hash bolt11 invoice.
- The `zap receipt` MUST contain a `description` tag which is the JSON-encoded zap request.
- `SHA256(description)` MUST match the description hash in the bolt11 invoice.
- `SHA256(description)` SHOULD match the description hash in the bolt11 invoice.
- The `zap receipt` MAY contain a `preimage` tag to match against the payment hash of the bolt11 invoice. This isn't really a payment proof, there is no real way to prove that the invoice is real or has been paid. You are trusting the author of the `zap receipt` for the legitimacy of the payment.
The `zap receipt` is not a proof of payment, all it proves is that some nostr user fetched an invoice. The existence of the `zap receipt` implies the invoice as paid, but it could be a lie given a rogue implementation.