Community Applications

Community applications — forums, marketplaces, and wikis — are built on MHR-Compute contracts managing CRDT state. All degrade gracefully to text-only on constrained links.

Forums

Forums are append-only logs managed by moderation contracts:

• Posts are immutable DataObjects, appended to a topic log
• Moderation is handled by an MHR-Compute contract that enforces community rules
• Threading is local — each client assembles thread views from the flat log
• Propagation uses neighborhood-scoped gossip for local forums, or wider replication for public forums

Moderation Model

The moderation contract defines:

• Who can post (trusted peers, vouched users, anyone)
• Content rules (enforced at the contract level)
• Moderator keys (who can remove content)
• Appeal mechanisms

Since moderation is a contract, different forums can have different moderation policies. There is no platform-wide content policy.

Marketplace

Marketplace listings are DataObjects with neighborhood-scoped propagation:

• Listings are mutable DataObjects (sellers can update price, availability)
• Search is local — each node indexes listings it has received
• Transactions happen off-protocol (physical exchange, external payment) or through MHR escrow contracts
• Reputation feeds back into the node's general reputation score

Escrow

For MHR-denominated transactions, an escrow contract can hold payment:

1. Buyer deposits MHR into escrow contract
2. Seller delivers goods/services
3. Buyer confirms delivery
4. Contract releases payment to seller
5. Disputes resolved by community moderators (trusted peers with moderator keys)

Wiki

Wikis are CRDT-merged collaborative documents:

• Pages are mutable DataObjects using CRDT merge rules
• Concurrent edits merge automatically without conflicts (using operational transforms or CRDT text types)
• History is preserved as a chain of immutable snapshots
• Permissions managed by an MHR-Compute contract (who can edit, who can view)

Bandwidth Degradation

All community applications degrade to text-only on constrained links:

Application	Full Experience	LoRa Experience
Forums	Rich text, images, threads	Text posts, flat view
Marketplace	Photos, maps, categories	Text listings
Wiki	Formatted text, images, tables	Plain text

The application layer handles this adaptation using query_link_quality() — the protocol doesn't need to know about the application's content format.