NIP-XX: Orders

[pats2sats]

Summary

Adds the marketplace order protocol for creating, negotiating, funding, acknowledging, settling, cancelling, and reviewing orders against NIP-99 listings. The proposal separates private negotiation from public payment/order lifecycle events so clients can coordinate trades without exposing unnecessary participant identity or payment evidence.

What this defines

• kind:32122 order events and deterministic order groups.
• Payment lifecycle events: payment, payment ack, payment settlement, order cancel, and payment nack.
• Private structured-message negotiation using signed child events inside encrypted rumors.
• Temporary trade key participant proofs for privacy-preserving public lifecycle events.
• Commit authorization for negotiated terms.
• Marketplace seed and review event usage.

Scope

This is the order and payment lifecycle layer. Listing semantics come from NIP-99 and the marketplace listing extension; arbiter discovery and settlement policy matching are defined by the arbitration services proposal.