ISSUE #101: [Core/Crypto]: Canonical Community Digest SHA-256 Hashing Engine

[josealfredo79]

🎯 Problem Statement

To create an immutable provenance passport for an indigenous micro-lot (coffee, honey, or backstrap loom textiles), we must compute a deterministic cryptographic digest combining:

1. Producer identification and parcel location.
2. The authentic oral audio testimonial in an indigenous variant (Tu'un Savi, Zapotec, or Spanish).
3. The photograph of the harvested batch or textile sample.
4. Unix timestamp and geographical coordinates (5-decimal precision).

🛠️ Technical Tasks

• Refactor CryptoEngine.computeSha256() to accept string, Uint8Array, and ArrayBuffer.
• Implement canonicalizeLotPayload(input: LotDigestInput): string ensuring dictionary keys are sorted alphabetically before serialization to prevent cross-platform hash discrepancies.
• Support hybrid execution: Native window.crypto.subtle in browsers with automatic fallback to Node's node:crypto when run server-side or in CI unit tests.
• Write test suite in src/core/crypto/__tests__/CryptoEngine.test.ts with at least 6 deterministic test vectors.

✅ Definition of Done (Acceptance Criteria)

• npm run test passes 100% without UI or React dependencies.
• Calling the digest with identical values in differing key order yields the exact same SHA-256 hash.
• Zero heavy external dependencies (leverages native Web Crypto API).

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• Target Module: src/core/crypto/CryptoEngine.ts

[pythonyx135793]

I’m interested in implementing the canonicalization, browser/Node SHA-256 support, and deterministic tests described here. Is the estimated 150 USDC reward approved and available for this issue? If so, could you confirm the payout network and whether you can assign it to me before I begin?

[openthot]

I have implemented the canonical community digest SHA-256 hashing engine, hybrid browser/Node execution, key sorting invariance, and 5-decimal coordinate normalization in PR #10.

All acceptance criteria are met with 11 deterministic test vectors (30/30 suite pass rate, 0 type errors):

• PR: feat(crypto): implement canonical community digest SHA-256 engine #10
• Tests: Passing NIST vectors, polymorphic buffer inputs, and key-order invariance.

[proofline-studio]

Hi — Proofline Studio can implement this scoped issue. Before starting, could you confirm that this issue is open for us to submit now and that an accepted implementation will be paid as 150 native USDC on Base, Ethereum, or Solana to our provided receiving address, including any deductions/fees and the acceptance route?