How SHA-256 cryptographic hashing creates a tamper-evident fingerprint for textile compliance documents. The forensic foundation of the National DPP Registry's Privacy-First Shield.
SHA-256 (Secure Hash Algorithm 256-bit) produces a unique 64-character hexadecimal fingerprint for any digital document. The mathematical properties of SHA-256 make it computationally impossible to reverse-engineer the original document from its hash, and any single-character change to the document produces a completely different hash. This is the forensic property that makes SHA-256 the standard for legal document integrity in the EU's DPP framework. When a South African textile manufacturer uploads their ISO 9001 certificate or B-BBEE compliance document, the SHA-256 hash is computed in the user's browser using the native SubtleCrypto API before the file is transmitted. The hash is the forensic proof that the document's integrity was locked at the point of creation.
The National DPP Registry implements client-side SHA-256 hashing as a Privacy-First Forensic Shield. The raw document is hashed in the user's browser before upload. Only the hash — not the original document — is stored in the public D1 ledger. The original document is stored in Cloudflare R2 with South African data localisation (POPIA compliant) and is only accessible to the verified entity owner and authorised EU customs agents. This architecture means the registry can publicly verify a document's integrity without exposing its contents — a critical distinction for manufacturers handling commercially sensitive material compositions or supplier contracts.
South Africa's Electronic Communications and Transactions Act (ECTA) 2002 recognises SHA-256 hashes as legally valid electronic signatures when combined with a biometric identity anchor. When a textile manufacturer clicks 'Mint' on the registry, the minting action is logged with the SHA-256 hash of the passport data, the CIPC registration number of the entity, the IP address and timestamp of the minting event, and the Smart ID biometric reference of the approving director. This creates a legally non-repudiable record under both ECTA 2002 and the EU's eIDAS Regulation — the manufacturer cannot later claim the data was altered or that they did not authorise the minting.
Upload your forensic core document to the Minting Station. The SHA-256 hash is computed client-side in your browser — the raw file never leaves your device unprotected. The hash is your forensic fingerprint: tamper-evident and legally non-repudiable under ECTA 2002.
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