[jeffrey-graham]

Summary

Implements Stellar wallet ownership proof generation, multi-format export (json, signed_json, verification_link), independent third-party verification, and the OwnershipProofPanel UI component.

Key Changes

• lib/ownership-proof-service.ts:
  • Generates immutable (Object.freeze) ownership proof records linking a Stellar wallet address, snippet ID, and verified Stellar transaction hash.
  • Produces canonical JSON serialization and deterministic HMAC-SHA256 signatures to detect tampering.
  • Supports exporting proofs as JSON, Signed JSON, and shareable Verification Links.
  • Independently verifies proofs across all 5 states (verified, invalid, tampered, pending, unverifiable) with granular verification checks (walletVerified, transactionVerified, snippetMatchConfirmed, networkVerified, signatureVerified).
  • Enforces wallet ownership authorization, rejects wrong-network transactions, handles transient network retries, and logs audit events.
• UI Component (components/snippets/OwnershipProofPanel.tsx):
  • Displays wallet, snippet, transaction, network, and status metadata with export, link copy, and live verification checklist actions.
• API Endpoints:
  • POST /api/snippets/[id]/ownership-proof & GET /api/snippets/[id]/ownership-proof
  • GET /api/ownership-proofs/[proofId]
  • POST /api/ownership-proofs/verify
• Tests (lib/__tests__/ownership-proof-service.test.tsx):
  • 11 unit, route, and React component tests covering generation, immutability, export formats, tampered/invalid detection, wrong-network rejection, authorization, and UI interactions.

Closes #219

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