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docs: Document existing Groth16 state circuit constraints implementation#127

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docs: Document existing Groth16 state circuit constraints implementation #127
Copilot wants to merge 4 commits intofeature/issue-45 from
copilot/sub-pr-120

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Copilot AI commented Dec 14, 2025 •

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The PR initially added a placeholder file claiming to implement Groth16 state circuit constraints, but the constraints were already fully implemented in crates/bitcell-zkp/src/state_constraints.rs (546 lines with StateCircuit and NullifierCircuit).

Changes

Replaced placeholder with comprehensive documentation covering:
- Implementation status: StateCircuit (Merkle tree verification, nullifier/commitment derivation) and NullifierCircuit (double-spend prevention)
- Technical specs: Groth16 on BN254 via arkworks, 32-level Merkle trees, R1CS constraints
- Constraint details: 4 constraints in StateCircuit, membership verification in NullifierCircuit
- API surface: setup(), prove(), verify(), public_inputs()
- Future work: Replace simplified hash with Poseidon, add range checks, optimize constraint count

Implementation Reference

The documented circuits are located in crates/bitcell-zkp/src/state_constraints.rs:

// StateCircuit enforces 4 key constraints:
// 1. Merkle path verification for old state
// 2. Nullifier derivation: H(leaf) == nullifier 
// 3. Commitment derivation: H(new_leaf) == commitment
// 4. Merkle path verification for new state
pub struct StateCircuit<F: PrimeField> {
 pub old_root: Option<F>, // public
 pub new_root: Option<F>, // public
 pub nullifier: Option<F>, // public
 pub commitment: Option<F>, // public
 // ... private witnesses
}

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Copilot AI assigned Copilot and Steake

Dec 14, 2025

Copilot AI mentioned this pull request

Dec 14, 2025

feat: Implement Real Groth16 State Circuit Constraints #120

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Copilot started work on behalf of Steake

December 14, 2025 17:19

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Steake commented Dec 14, 2025

[autopilot] 🤖 Direct LLM Analysis

Decision: reject
Confidence: 70%
Reasoning: The PR is marked as WIP (Work In Progress) and indicates that changes are still being made, which suggests it is not ready for merging.

Blocking Issues:

PR is a work in progress
Implementation is not complete

Copilot AI and others added 3 commits

December 14, 2025 17:22

@Steake


 Replace placeholder with comprehensive Groth16 state circuit document...

acfcc38

...ation
Co-authored-by: Steake <530040+Steake@users.noreply.github.com>

@Steake


 Fix documentation issues from code review

531888c

Co-authored-by: Steake <530040+Steake@users.noreply.github.com>

@Steake


 Improve constraint descriptions for accuracy

eb5448a

Co-authored-by: Steake <530040+Steake@users.noreply.github.com>

Copilot AI changed the title ~~(削除) [WIP] Fix implementation of real Groth16 state circuit constraints (削除ここまで)~~ (追記) docs: Document existing Groth16 state circuit constraints implementation (追記ここまで)

Dec 14, 2025

Copilot AI requested a review from Steake

December 14, 2025 17:31

Copilot finished work on behalf of Steake

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Copilot AI commented Dec 14, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Implementation Reference

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Copilot AI commented Dec 14, 2025 •

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