add SWIP-61: BPS multihop — FCFS multicast tree - #105
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Extends SWIP-60 (#104): removes the singlehop audience ceiling. A full node at capacity answers
Subscribeby probing its own subtree over existing streams and returning the two shallowest attachment points — the joiner attaches to both, so every node keeps two parents (typically sisters): churn is masked, not suffered, self-healing is re-running the join, and withholding shows by comparing feeds. Join is ideally a two-step process regardless of tree size.Key properties: forwarders are subscribers (accepting your first child = becoming a relay); no standing control state — idle cohorts are silent, probes carry depth in the frame itself; no depth bound (per-hop pricing steers joins rootward; closed cohorts are structurally singlehop);
CohortSpecuntouched; three control frames (Reparent,Probe,Candidates) fill the reservedBroadcastrange; single newAckfield. Unmodified SWIP-60 clients attach as conformant (single-parented) leaves.Deliberately out of scope (own SWIPs): bandwidth incentives, message history (pre-subscription delivery), broker discovery (SWIP-59, #103), NAT traversal (transport: circuit relay + DCUtR).
Wire:
assets/swip-61/bps.proto— the SWIP-60 proto with the multihop control plane filled in. Implementation groundwork: bee ethersphere/bee#5435.🤖 Generated with Claude Code