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+NIP-92
+==========================
+
+Rendezvous Beacons
+------------------
+`draft` `optional` `author:shafemtol`
+
+A rendezvous beacon is used to anonymously deliver a secret event to a recipient
+without prior communication between sender and recipient. Apart from its
+timestamp, a rendezvous beacon is indistinguishable from any other rendezvous
+beacon of the same kind on the same relay.
+
+A stored rendezvous beacon has kind `9992`, while an ephemeral rendezvous beacon
+has kind `29992`.
+
+`pubkey` MUST be a unique public key with no publicly known relation to any
+other event.
+
+`content` MUST be the 8-character base64 encoded string of a 6-byte combined
+hash/nonce, generated as described below.
+
+For stored beacons, `tags` SHOULD contain a `NIP-40` `expiration` tag with a
+value of `created_at` plus exactly `10000000` (ten million) seconds and no other
+tags. It is not recommended to use stored rendezvous beacons on relays that do
+not support `NIP-40`.
+
+For ephemeral beacons, `tags` SHOULD be an empty list.
+
+`created_at` SHOULD be approximately the time the event is submitted to the
+relay.
+
+
+Public User Metadata
+--------------------
+
+In order for the sender to know how to reach the recipient, the recipient needs
+to publish some parameters in their `set_metadata` event, with the following
+attribute:
+
+`"bip92": [<subprefix>,<recipient_pubkey>,<relays>...]`
+
+`<subprefix>` MUST be either an empty string or a single hexadecimal character.
+In order to match the recipient's subscription filter, the `id` of the beacon
+MUST have a prefix that matches `"0000" + <subprefix>`.
+
+`<recipient_pubkey>` is the pubkey to use together with the key for the secret
+beacon to derive a shared secret as described below.
+
+`<relays>` are the remaining items in the list, specifying the relays where the
+recipient expects to receive a beacon.
+
+
+Beacon Generation
+-----------------
+
+- Generate a random keypair `a, A`.
+- Derive the shared secret `S` as described below.
+- Let `k = bytes(tagged_hash("NIP0092/beacon", bytes(x(S))))`.
+- Let `i` be the 0-indexed position in `<relays>` where the secret event is to
+  be found.
+- Let `d` be a random odd positive integer below `2³²`.
+- For `j` in `0, 1, ...`:
+    - Let `p` be the 2-byte encoding of `i` followed by the 4-byte encoding of
+      `(j * d) mod 2³²`, each with the most significant byte first.
+    - Let `c` be the byte-wise `xor` of `p` and `k[0:6]`.
+    - Construct the beacon event, with `A` as the `pubkey` and `c` as the
+      `content`.
+    - If the resulting `id` matches the required prefix, break out of the loop.
+- Sign the beacon event using `a` and deliver it to one of the relays listed in
+  `<relays>`.
+
+
+Shared Secret Derivation
+------------------------
+
+Given the keypair `a, A` of the beacon (`A` being its `pubkey`) and the keypair
+`b, B` of the recipient (`B` being their `recipient_pubkey`), the shared
+secret is simply the point `S` resulting from ECDH operation, that is, `S =
+a⋅B`, or equivalently, `S = b⋅A`. The shared secret is used in subsequent
+derivations as `tagged_hash(tag, bytes(x(S)))`, with the functions as defined in
+[BIP-340](https://bips.xyz/340).
+
+
+Secret Event Delivery
+---------------------
+
+The secret event to be delivered to the recipient is given the rendezvous
+keypair `r, R` (`R` being the `pubkey`), calculated as follows:
+
+- `t = bytes(tagged_hash("NIP0092/tweak", bytes(x(S))))`
+- `r = (a + t) mod n`
+- `R = A + t⋅G`
+
+The sender is able to derive `r` and uses this to construct and sign the secret
+event.
+
+From the beacon, the recipient derives the shared secret and is thus able to
+learn `R`. The recipient uses `R` to find the secret event on the relay
+indicated in the beacon.