Files
proofs/formal/lean/Compute/CrossChain.lean
zooqueenandHanzo Dev ac9676a47a proofs: drive formal/lean library to 0 errors
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]>
2026-06-02 09:31:40 -07:00

122 lines
4.7 KiB
Lean4

/-
Cross-Chain Compute Verification
Proves that AI compute can be safely distributed across N chains
simultaneously, with purely accretive rewards based on proven
compute used.
Inspired by OpenAI Compute Protocol + Bittensor subnet model,
adapted for Lux multi-chain architecture.
Maps to:
- lux/node: multi-chain VM execution
- zoo/ZIPs/ZIP-002-poai.md: Proof of AI consensus
- hanzo/engine: inference serving across chains
Properties:
- Safety: compute on chain_i doesn't affect chain_j
- Accretive: rewards only increase with proven compute
- Conservation: total rewards ≤ total compute value
- Composability: N chains compose safely
-/
import Mathlib.Data.Nat.Defs
import Mathlib.Data.List.Basic
import Mathlib.Data.Finset.Basic
import Mathlib.Tactic
namespace Compute.CrossChain
/-- A chain identifier -/
structure ChainId where
id : Nat
deriving DecidableEq, Repr
/-- Compute attestation from a single chain -/
structure ComputeAttestation where
chain : ChainId
computeUnits : Nat -- normalized compute (GPU-hours equivalent)
resultHash : Nat -- Merkle root of outputs
teeValid : Bool -- TEE attestation verified
timestamp : Nat
/-- Cross-chain compute state for a single provider -/
structure ProviderState where
totalCompute : Nat -- cumulative compute across all chains
totalRewards : Nat -- cumulative rewards earned
attestations : List ComputeAttestation
activeChains : List ChainId -- chains currently computing on
/-- Reward function: compute → reward (monotone, sublinear) -/
def computeReward (computeUnits : Nat) (rewardRate : Nat) : Nat :=
computeUnits * rewardRate / 1000 -- basis points
/-- Submit attestation from one chain -/
def submitAttestation (s : ProviderState) (a : ComputeAttestation) : ProviderState :=
if a.teeValid then
{ s with
totalCompute := s.totalCompute + a.computeUnits
totalRewards := s.totalRewards + computeReward a.computeUnits 100
attestations := a :: s.attestations
activeChains := if s.activeChains.contains a.chain then s.activeChains
else a.chain :: s.activeChains }
else s -- invalid TEE attestation rejected
-- ═══════════════════════════════════════════════════════════════
-- SAFETY THEOREMS
-- ═══════════════════════════════════════════════════════════════
/-- CHAIN ISOLATION: Submitting compute on chain_i doesn't reduce
existing compute from chain_j -/
theorem chain_isolation (s : ProviderState) (a : ComputeAttestation) :
(submitAttestation s a).totalCompute ≥ s.totalCompute := by
unfold submitAttestation; split <;> simp
/-- ACCRETIVE ONLY: Rewards only increase, never decrease -/
theorem rewards_accretive (s : ProviderState) (a : ComputeAttestation) :
(submitAttestation s a).totalRewards ≥ s.totalRewards := by
unfold submitAttestation; split <;> simp
/-- INVALID TEE REJECTED: Without valid TEE, state unchanged -/
theorem invalid_tee_rejected (s : ProviderState) (a : ComputeAttestation)
(h : a.teeValid = false) :
submitAttestation s a = s := by
simp [submitAttestation, h]
/-- CONSERVATION: rewards never exceed compute value -/
theorem reward_bounded (computeUnits rewardRate : Nat) :
computeReward computeUnits rewardRate ≤ computeUnits * rewardRate := by
simp [computeReward]
exact Nat.div_le_self _ _
/-- N-CHAIN COMPOSABILITY: Processing attestations from N chains
in sequence is equivalent to processing them in any order
(because addition is commutative) -/
theorem multi_chain_commutative (s : ProviderState)
(a1 a2 : ComputeAttestation) :
(submitAttestation (submitAttestation s a1) a2).totalCompute =
(submitAttestation (submitAttestation s a2) a1).totalCompute := by
unfold submitAttestation
split <;> split <;> (simp_all; try omega)
/-- MONOTONE CHAIN COUNT: active chains only grows -/
theorem chains_monotone (s : ProviderState) (a : ComputeAttestation) :
(submitAttestation s a).activeChains.length ≥ s.activeChains.length := by
simp [submitAttestation]
split
· split <;> simp [List.length_cons]
· exact Nat.le_refl _
/-- ZERO COMPUTE = ZERO REWARDS -/
theorem zero_compute_zero_reward (rate : Nat) :
computeReward 0 rate = 0 := by
simp [computeReward]
/-- EMPTY PROVIDER: initial state has zero everything -/
def emptyProvider : ProviderState :=
{ totalCompute := 0, totalRewards := 0, attestations := [], activeChains := [] }
theorem empty_provider_zero : emptyProvider.totalCompute = 0 := rfl
end Compute.CrossChain