Blockchain-anchored certification verification
xProduct makes compliance documentation tamper-evident and auditable. We store your certificates securely, hash the documents + key fields, and anchor the proof on-chain so retailers, resellers, and auditors can verify integrity anytime.
If a certificate PDF or key fields change, the hash changes — and the on-chain proof will no longer match.
Maintain a complete verification history with timestamps, reviewer identity, and supporting evidence.
We anchor only hashes and references on-chain. Your original documents remain in secure storage.
How blockchain verification works
Store the certificate PDF and save structured fields like certificate number, owner, scope, issue and expiry dates.
xProduct creates a hash proof from the PDF + canonical JSON of key fields, then anchors it to Polygon.
fieldsHash = SHA-256(Canonical JSON fields)
proofHash = SHA-256(pdfHash + fieldsHash)
When verification checks pass and the certificate is in-date, xProduct can display a Verified badge alongside the certificate entry and in the passport (if you choose to show it publicly).
we do not store the PDF on-chain — only the tamper-evident proof (hash).
Technical Architecture Diagram
This is a real Polygon blockchain transaction that permanently records the cryptographic fingerprint of a certificate at a specific point in time.
By anchoring this proof on a public blockchain, xProduct creates an immutable, time-stamped audit trail that cannot be altered, deleted, or backdated.
Anyone can independently inspect this record on Polygonscan — without access to your private documents or your xProduct account.
- Public & independent: Verifiable by auditors, regulators, and trading partners without logging into xProduct.
- Timestamped: Proves exactly when the certificate proof was anchored on-chain.
- Tamper-evident: Any change to the PDF or key fields produces a different hash and breaks verification.
- Immutable: Once written, the blockchain record cannot be modified or removed.
- Audit-ready: Creates long-term evidence suitable for regulatory reviews and compliance audits.
- Privacy-preserving: Only the proof hash is public — no PDFs, no personal or commercial data.
Verification badges
The certificate proof hash exists on-chain and can be independently checked.
Verified against issuer portal/API (where possible) or internal review with evidence attached.
Certificate has passed expiry date. Badge turns off automatically and renewal can be requested.