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+---
+title: OP-CHAN
+name: OpChan Decentralized Forum
+status: raw
+category: Standards Track
+tags: waku
+editor: 
+contributors:
+  - Jimmy Debe <jimmy@status.im>
+---
+
+## Abstract
+
+This document specifies the architecture of OpChan.
+OpChan is a decentralized forum application built on the Waku protocol.
+
+
+## Background
+
+OpChan supports ephemeral anonymous sessions and wallet-
+backed identities, identity key delegation, and stores content locally
+while distributing messages over the Waku network.
+All user data persists locally
+and syncs via Waku messages to peers.
+- Authentication and user publishing are provided either by ed25519 stored in the client or
+wallet signature.
+
+## Terminology
+
+- Forum: A discussion board (analogous to a forum or channel) that groups
+  posts and moderation controls.
+- Post: Top-level user content created within a forum.
+- Comment: A reply to a `Post` or other `Comment` (threaded discussion).
+- Participant: Any actor able to publish or consume messages (anonymous or
+  wallet-backed).
+- Anonymous session: A browser-generated ed25519 keypair used as
+  identity for a user without a wallet.
+
+
+## Specification
+
+The keywords “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”,
+“SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and
+“OPTIONAL” in this document are to be interpreted as described in [2119](https://www.ietf.org/rfc/rfc2119.txt).
+
+OpChan uses [10/WAKU](https://github.com/vacp2p/rfc-index/blob/main/waku/standards/core/10/waku2.md)
+as the transport for peer-to-peer distribution of messages, 
+as [14/WAKU-MESSAGE](https://github.com/vacp2p/rfc-index/blob/main/waku/standards/core/14/message.md).
+The messages are cryptographically signed using ed25519 keys generated locally in the broswer window.
+Wallet users MAY create a token signed by the wallet's private key.
+
+OpChan messages fall into two broad classes:
+
+1. Content messages
+2. Control messages
+
+Message routing and
+discovery are handled by [23/WAKU2-TOPICS](https://github.com/vacp2p/rfc-index/blob/main/waku/informational/23/topics.md).
+
+### Message Format (high-level)
+
+All messages transmitted over the Waku network MUST include the following envelope fields:
+
+``` js
+
+id: string 
+type: enum { CELL_CREATED, POST_CREATED, COMMENT_CREATED, VOTE, BOOKMARK, MODERATION, DELEGATION }
+timestamp: uint64
+author: string // author public key or wallet address
+signature: bytes // ed25519 signature of the canonical serialized body
+delegationProof?: bytes // optional wallet signature authorizing the browser key
+body: object //
+
+```
+
+Rules for signing:
+
+1. Serialize `body` fields in stable key order (JSON canonical form or
+   protobuf deterministic encoding).
+2. Construct signing bytes with: `type`, `timestamp`, `author`
+3. Sign with the browser key registered for the session.
+
+OpChan MUST verify the `signature` against the `author` and,
+when present, verify `delegationProof`.
+
+### Identity
+
+There are two types of identity options,
+anonymous session and wallet delegation.
+An anonymous session generates an ed25519 keypair locally with the client.
+The key is used to sign all messages.
+- The session may include a Call Sign. ***
+A wallet delegation connects a user's wallet to OpChan.
+The wallet produces a short-lived delegation signature as the key.
+That delegation proof is attached to each message and
+verified is by peers in the network.
+
+#### Delegation flow:
+
+1. Client generates a new ed25519 keypair and a delegation request.
+2. Wallet signs the delegation request and returns a `delegationProof` with an
+   expiration `timestamp`.
+3. The client stores the `delegationProof`, `browserKey`,
+and `expiry`.
+The `delegationProof` SHOULD be included in outgoing messages until `expiry`.
+
+- `delegationProof` verification,
+verify the wallet signature over the delegation request matches the wallet public key,
+the `author` public key in messages
+
+### Moderation & Permissions
+
+
+A post has metadata (id, name,
+creator, admins, admins can moderate (hide, remove, or penalize content within the forum).
+
+Moderation events are control messages with types like `MODERATION_ACTION`:
+
+- action: enum { HIDE, REMOVE, PIN, UNPIN, CHANGE_OWNERSHIP },
+ 
+Moderation messages MUST be signed by a recognized post admin.
+Clients MUST validate the admin membership before applying moderation actions locally.
+
+
+OpChan  
+
+- posts
+- comments
+- votes
+- users (identities, call signs, delegation proofs)
+- bookmarks
+- moderations
+
+Incoming Waku messages are validated
+
+If delegation is revoked, 
+peers should ignore subsequent messages from the revoked delegation key.
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
+
+## References
+- [10/WAKU](https://github.com/vacp2p/rfc-index/blob/main/waku/standards/core/10/waku2.md)
+- [14/WAKU-MESSAGES](https://github.com/vacp2p/rfc-index/blob/main/waku/standards/core/14/message.md)
+- 
+
+