feat: FlyClient Path A library + design decision (#1555, #3479)#3909
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iho wants to merge 1 commit into
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feat: FlyClient Path A library + design decision (#1555, #3479)#3909iho wants to merge 1 commit into
iho wants to merge 1 commit into
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…mimblewimble#3479) Phase 0 + Phase 1 for FlyClient without a consensus-breaking VDMMR: - doc/flyclient.md: design memo recommending Path A (sampling-only) given existing header MMR + prev_root and wtema DAA; Path B deferred - core/src/flyclient.rs: difficulty-weighted sampling, proof types, structural verification (Merkle paths, prev linkage, difficulty order, inter-sample work/time bounds), binary ser/de via Writeable/Readable - Unit tests: deterministic sampling, synthetic chain prove+verify, reject tampered Merkle paths Full-node prover, API, and PoW checks on samples are follow-ups.
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Summary
Implements Phase 0 + Phase 1 of FlyClient for Grin, following the research plan grounded in #1555, #3479, the FlyClient paper, ZIP 221, and RFC 0018 (wtema).
Design decision (Path A)
Grin already has a header MMR and
prev_root(#1555 largely done). The remaining gap is the light-client sampling + proof protocol.Path A (this PR): no consensus change — difficulty-weighted samples + Merkle proofs against the existing header MMR + predecessor headers for wtema neighborhood checks.
Path B (deferred): VDMMR parent aggregates (paper / ZIP 221 / closed #3480) would be a hard fork; only pursue if security review shows ancestor aggregate checks are load-bearing under wtema.
Details:
doc/flyclient.mdCode
core/src/flyclient.rsSampleParams,sample_difficulty_targets,height_for_difficulty_target,FlyClientProof/FlyClientSample,verify_structureNot in this PR
chaincrate)Test plan
cargo test -p grin_core --lib flyclient(5 passed)doc/flyclient.mdRefs: #1555 #3479