OMP Internal Design #13: collab-web & wire protocol — How Multi-User Sessions Serialize, Guest Permission Boundaries, and Composer Interrupt Broadcast
omp collab uses a hub topology (host authoritative, guests never peer) with AES-256-GCM sealed JSON frames, 4-byte envelope, and snapshot-chunk sharding. Guest permissions are bound to a 16-byte write token in the link, verified by the host via timing-safe comparison.