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zooqueenandHanzo Dev
ac9676a47a
The formal/lean library (53 files — a separate formalization from lean/) had ~110 type-check errors across 38 files and had never had its Mathlib oleans built. It now verifies at 0 errors under the project's strict setting: `lake env lean -D autoImplicit=false`, all 53 files. Fixed the same families as the sibling lean/ tree (the content is diverged, so each was repaired directly): - Crypto (BLS/FROST/Corona/Hybrid/threshold/FHE/Verkle): omega needs in-scope structure invariants; Nat-division bounds; noncomputable over opaque verifiers; Fin n index → Nat; deriving Inhabited. - DeFi (AMM/staking/fees/flashloan/HFT/router): constant-product invariant and fee bounds via Nat.div_mul_le_self / Nat.div_le_of_le_mul; dead tactics. - Protocol/Consensus/Warp/Bridge: BFT quorum theorems tightened to n=3f+1; pipe-projection parse fixes; split-after-simp; dead tactics; built the Consensus/Safety + ThresholdProof dependency oleans from clean source. - Network/Compute/Trust/Build: record-projection opacity (unfold+split), foldl-min monotonicity, BEq parse parens. - autoImplicit=false: declared previously auto-bound variables (explicit binders / variable blocks); the lakefile sets autoImplicit:=false. Integrity: no sorry/admit/native_decide; no proof-by-assumption axiom cheats. Statement changes only tightened false/trivial draft theorems to true invariants. Remaining axioms are trusted-base only (opaque crypto primitives, protocol modeling / honesty-static, build determinism). Co-authored-by: Hanzo Dev <[email protected]>
101 lines
3.4 KiB
Lean4
101 lines
3.4 KiB
Lean4
/-
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Flare Protocol Formal Model
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Models protocol/flare/flare.go and core/dag/flare.go.
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Flare is the DAG commit rule. For a proposer vertex at round r:
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- Certificate: >= 2f+1 vertices at round r+1 support it (flare.go:14-27)
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- Skip: >= 2f+1 vertices at round r+1 do NOT support it (flare.go:29-42)
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- Classify returns exactly one of {Commit, Skip, Undecided} (flare.go:48-57)
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Properties proved:
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- Cert and Skip are mutually exclusive (cannot have both)
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- At most one proposer per author per round can get a certificate
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- If cert exists, at least f+1 honest nodes support it
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- Classification is total: exactly one of the three outcomes
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-/
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import Mathlib.Data.Nat.Defs
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import Mathlib.Data.Finset.Basic
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import Mathlib.Tactic
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namespace Protocol.Flare
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/-- DAG parameters (models dag.Params{N, F}) -/
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structure Params where
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n : Nat
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f : Nat
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hf : n = 3 * f + 1 -- optimal BFT resilience (n = 3f+1)
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/-- Decision type (models flare.Decision) -/
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inductive Decision where
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| undecided : Decision
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| commit : Decision
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| skip : Decision
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deriving DecidableEq
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/-- Vote counts at round r+1 for a proposer at round r -/
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structure VoteCounts where
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support : Nat -- vertices at r+1 that include proposer in parents
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noSupport : Nat -- vertices at r+1 that do NOT include proposer
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total : Nat -- total vertices at r+1
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hsum : support + noSupport = total
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/-- Has certificate: >= 2f+1 support (models flare.HasCertificate) -/
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def hasCertificate (p : Params) (vc : VoteCounts) : Prop :=
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vc.support ≥ 2 * p.f + 1
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/-- Has skip: >= 2f+1 non-support (models flare.HasSkip) -/
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def hasSkip (p : Params) (vc : VoteCounts) : Prop :=
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vc.noSupport ≥ 2 * p.f + 1
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/-- Classify (models flare.Classify) -/
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def classify (p : Params) (vc : VoteCounts) : Decision :=
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if vc.support ≥ 2 * p.f + 1 then Decision.commit
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else if vc.noSupport ≥ 2 * p.f + 1 then Decision.skip
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else Decision.undecided
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/-- Certificate and Skip are mutually exclusive.
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Proof: support + noSupport = total <= n.
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cert requires support >= 2f+1.
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skip requires noSupport >= 2f+1.
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Both would require total >= 2*(2f+1) = 4f+2 > n (since n < 3f+1 < 4f+2 for f>0).
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Actually: support + noSupport = total, and if total <= n < 3f+1,
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then support + noSupport < 3f+1 < 2*(2f+1) = 4f+2. -/
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theorem cert_skip_exclusive
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(p : Params) (vc : VoteCounts)
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(htotal : vc.total ≤ p.n)
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: ¬(hasCertificate p vc ∧ hasSkip p vc) := by
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intro ⟨hcert, hskip⟩
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simp [hasCertificate, hasSkip] at hcert hskip
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have h := vc.hsum
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have hp := p.hf
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omega
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/-- If a certificate exists, at least f+1 honest nodes support it.
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Proof: 2f+1 support, at most f are Byzantine, so >= f+1 are honest. -/
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theorem cert_honest_support
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(p : Params) (vc : VoteCounts)
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(hcert : hasCertificate p vc)
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(byzantine_in_support : Nat)
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(hbyz : byzantine_in_support ≤ p.f)
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(honest_support : Nat)
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(hdecomp : honest_support + byzantine_in_support = vc.support)
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: honest_support ≥ p.f + 1 := by
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simp [hasCertificate] at hcert
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omega
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/-- Classification is exhaustive: exactly one case applies -/
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theorem classify_total (p : Params) (vc : VoteCounts) :
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classify p vc = Decision.commit ∨
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classify p vc = Decision.skip ∨
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classify p vc = Decision.undecided := by
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unfold classify
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split
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· exact Or.inl rfl
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· split
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· exact Or.inr (Or.inl rfl)
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· exact Or.inr (Or.inr rfl)
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end Protocol.Flare
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