Implement ZK-Proof Generation Wrapper using SnarkJS

[Lakes41]

Background

Whitechain includes privacy-preserving governance voting. The smart contracts require Groth16 zk-SNARK proofs to validate votes.

Problem

Generating zk-proofs on the client side (browser) is computationally heavy and requires complex WASM integrations, compiling constraint systems, and managing proving keys.

Expected Outcome

A highly optimized SDK module that abstracts SnarkJS logic, dynamically loads proving keys via Web Workers to prevent UI freezing, and outputs on-chain ready calldata.

Suggested Implementation

• Create src/zk/Prover.ts.
• Integrate snarkjs (as an optional peer dependency to prevent bloat for non-ZK users).
• Implement a Web Worker script to offload the snarkjs.groth16.fullProve computation off the main thread.
• Implement a formatting utility that converts the SnarkJS JSON output into the exact uint256[8] array structure required by the Solidity verifier.

Acceptance Criteria

• Generating a proof does not block the browser's UI rendering.
• Automatically downloads zkey and wasm files from a CDN if they are not cached locally.
• Outputs formatted calldata that successfully executes against the on-chain verifier.

Likely Affected Files

• src/zk/Prover.ts
• src/zk/worker.js

Requirements

• The WASM files are too large to bundle. The module must securely fetch them at runtime and verify their integrity (hashes) before execution.

[jchinedu]

let me work on this issue. thank you

[grantfox-oss]

🦊 GrantFox — @jchinedu has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #69)
2. Your PR will be reviewed by the Adamantine-guild maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@jchinedu's PR #147 was approved and merged by @Lakes41.

🏆 @jchinedu: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (853 total points). Track your full progress on GrantFox.

👏 Great work, @jchinedu! Keep contributing to Adamantine-guild.