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          "downloadUrl": "https://raw.githubusercontent.com/vladleopold/spine/main/library/w140102_spine-2026-07-28T23-58-10-580Z/source-proof.json"
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  "legalEvidence": {
    "statement": "This record links file SHA-256 hashes, browser/account identity hashes, browser environment evidence, GitHub repository writes, and an optional EVM transaction payload for source-origin evidence.",
    "privacy": "Email is stored only as SHA-256 in the proof. Anonymous browser/account identifiers are pseudonymous and should be treated as evidence metadata, not personal identity by themselves."
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    "message": "Set BLOCKCHAIN_RPC_URL and BLOCKCHAIN_PRIVATE_KEY in the server environment to write this proof hash to an EVM blockchain transaction."
  }
}