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+NIP-108
+======
+
+Lightning Gated Notes
+-------------------------------
+
+`draft` `optional` `author:coachchuckff` `author:excalibur_guild`
+
+This NIP defines three events for gating Notes behind lightning paywalls: 
+
+- Lightning-Gated Note ( `kind:55` ): This note allows you wrap any type of note behind a lightning gated paywall by encrypting the payload with a purchasable decrypt key.
+- Key Note ( `kind:56` ): This note encrypts the key for a given note, per user, using [NIP-04](https://github.com/nostr-protocol/nips/blob/master/04.md) between the corresponding gate creator's public key and the purchasers. It is linked to the gated note with the `g` tag.
+- Announcement Note ( `kind:54` ): This note acts as the announcement of the gated note, giving a short preview of the content. It is linked to the gated note with the `g` tag.
+
+A complete open-source implantation of [NIP-108 is available](https://github.com/project-excalibur/Nostr-Playground/tree/main/apps/nip108).
+
+An example client can be found at [Nostr Playground](https://nip-108.nostrplayground.com/).
+
+## Protocol flow
+### Creating Gated Notes
+1. Poster creates a note of any kind
+2. Poster `JSON.stringify`s the whole note.
+3. Poster encrypts the note string with a new nsec `secret`, and `iv` using `aes-256-cbc`.
+4. Poster creates the gated note `kind:55` with the encrypted note json string in the `content` field, while putting `iv`, `cost` (mSats), and `endpoint` as tags. The `endpoint` tag is the server endpoint you use to hold your `secret`'s and issue lightning invoices from your `lud16`.
+5. Poster then creates an announcement note `kind:54` with the `g` tag (gated note's id) to preview the gated content.
+
+### Consuming Gated Notes
+1. Client finds gated content they want to purchase by browsing `kind:54` announcement notes. 
+2. Client loads the associated gated note of `kind:55` found in the `g` tag
+3. Client then GETs the `[endpoint]/[id]`
+4. Gate server will respond with a 402 PR requesting a payment for the `cost` tag's amount in mSats
+5. Client pays the amount
+6. Client uses the `successAction` url returned in the PR to fetch the `secret` which will unlock the gated content.
+7. Client uses the `secret` and the gated note's `iv` tag to decrypt the content using `aes-256-cbc`
+8. Client then creates a key note `kind:56` with the content being the `nip-04` encrypted secret with their publicKey and the gate note's creator publicKey.
+9. Upon revisiting the gated note, the client can then decrypt the content using their key note.  
+
+## Server Functions
+NIP-108 requires an outside server to store `secret`s and issue lighting invoices to those wishing to purchase the digital content.
+
+The server should have two endpoints:
+`[endpoint]/create` - POST to create new notes
+`[endpoint]/[id]` - GET to fetch the PR to purchase the gated note's `secret`, where `id` is the gated note's `id`.
+
+
+### Create a Gated Note
+The server first needs to be able to store a gated note's `secret`. Minimally, the server needs to store four items: the gated note's `id`, the owner's `lud16`, the decrypt `secret`, and the `cost` in msats.
+
+It is advised to also check, server-side, that the gated note can be unlocked. To accomplish this the following should be done:
+
+1. Accept a POST to the server's `create` endpoint, with the following: `gateEvent`, `lud16`, `secret`, and `cost`;
+2. The server should then decrypt the `gateEvent` using the `secret` and the `iv` tag provided in the event. Since a gated event is just an encrypted JSON stringified event, you should be able to check any of the decrypted note's field to know it's been decrypted successfully.
+3. One should also check that the `endpoint` matches the server's domain
+4. Store in the server's database the gated note's `id`, owner's `lud16`, decrypt `secret` and `cost`. 
+
+```typescript
+APP.post("/create")
+```
+
+```typescript
+export interface CreateNotePostBody {
+  gateEvent: VerifiedEvent<number>;
+  lud16: string;
+  secret: string;
+  cost: number;
+}
+```
+
+### Handling Purchases
+Once the server has stored a gated note's `secret`, it can then be purchased via lightning. 
+
+1. A user will GET `[endpoint]/[id]` and the server will...
+   1. If `id` exists, return a 402 with a PR fetched from the stored `lud16` for the amount of the stored `cost`
+   2. If `id` does not exist, return a 404.
+2. The PR will contain a `successAction` url which should be formatted as such: `[endpoint]/[id]/[payment_hash]`. It is up to the user to poll this `successAction`.
+3. When the `[endpoint]/[id]/[payment_hash]` endpoint is hit, the server should check the payment status...
+   1. If paid, return a JSON string `{secret: [secret]}`
+   2. If not paid, return a 402 with the same PR
+
+
+```typescript
+APP.get("/:noteId")
+```
+
+```typescript
+APP.get("/:noteId/:paymentHash")
+```
+
+## Event Reference and Examples
+### Gated Note ( Kind:55 )
+
+`kind:55`
+
+`.content` should be a JSON stringified event of any kind.
+
+`.tag` MUST include the following:
+
+- `iv`, the **i**nitialization **v**ector used to encrypt the `content`
+- `cost`, the cost to unlock in msats
+- `endpoint`, the domain of the server used to store your decrypt `secret`. The user can then call GET on `[endpoint]/[id]` to fetch the unlock PR.
+
+### Announcement Note ( Kind:54 )
+
+`kind:54`
+
+`.content` some preview or announcement of the content you have locked away.
+
+`.tag` MUST include the following:
+
+- `g`, the id of the gated event.
+
+### Key Note ( Kind:56 )
+
+`kind:54`
+
+`.content` the `secret` encrypted via [NIP-04](https://github.com/nostr-protocol/nips/blob/master/04.md)'s encrypt function between the gated note's creator's pubkey and your pubkey.
+
+`.tag` MUST include the following:
+
+- `g`, the id of the gated event.
+
+### Encryption/Decryption
+
+To encrypt/decrypt `kind:56` key notes, we use [NIP-04](https://github.com/nostr-protocol/nips/blob/master/04.md)'s encrypt/decrypt functions between the gated note's creator's pubkey and your pubkey.
+
+To encrypt/decrypt the gated note, we use `aes-256-cbc`. Below is a simple implementation in ts:
+
+```typescript
+import * as cryptoBrowser from 'crypto-browserify';
+
+const algorithm: string = 'aes-256-cbc';
+
+export interface EncryptedOutput {
+    iv: string;
+    content: string;
+}
+
+export function hashToKey(inputString: string): Buffer {
+    return cryptoBrowser.createHash('sha256').update(inputString).digest();
+}
+
+export function encrypt(text: string, key: Buffer): EncryptedOutput {
+    const iv: Buffer = cryptoBrowser.randomBytes(16);
+    const cipher = cryptoBrowser.createCipheriv(algorithm, key, iv);
+    const encrypted: Buffer = Buffer.concat([cipher.update(text, 'utf8'), cipher.final()]);
+
+    return {
+        iv: iv.toString('hex'),
+        content: encrypted.toString('hex')
+    };
+}
+
+export function decrypt(iv: string, content: string, key: Buffer): string {
+    const decipher = cryptoBrowser.createDecipheriv(algorithm, key, Buffer.from(iv, 'hex'));
+    const decrypted: Buffer = Buffer.concat([decipher.update(Buffer.from(content, 'hex')), decipher.final()]);
+
+    return decrypted.toString('utf8');
+}
+
+```
+
+### Problems
+
+- Servers need to be trusted
+- Nothing is stopping people from freely giving their decrypt key
+
+### Example Implementations
+
+- [Client](https://nip-108.nostrplayground.com/)
+- [Server](https://github.com/project-excalibur/Nostr-Playground/tree/main/apps/nip108)