Tamper-evident data · zerotamper.com

Data you can prove.

ZeroTamper takes a SHA-256 fingerprint of your file and anchors it on a private, verifiable blockchain. Change a single byte later and verification fails. Your file itself is never published.

How it works

1. Upload. Sign in with Microsoft and upload a file. We calculate its SHA-256 fingerprint.
2. Anchor. The fingerprint is recorded in a signed block on ZeroTamper's private blockchain, giving you a verifiable record and a transaction reference.
3. Verify. Upload a file at any time and we compare its fingerprint with the blockchain record. A match proves the file is unchanged since it was anchored.

Certificates

Once a file is anchored you can download a one-page PDF certificate showing its SHA-256 fingerprint, the transaction hash, the block number and a QR code that opens the public evidence page. The certificate never contains the file itself.

Network explorer

The ZeroTamper explorer lets you search anchors by evidence SHA-256, transaction hash, block hash or block number, check a file against the blockchain (hashed in your browser, never uploaded) and see validator status and the latest quorum-certified blocks.

Verifiable documents

ZeroTamper adds visible verification watermarks to protected documents, linking document verification details with the blockchain integrity record.

Use cases

• IT and MSPs: audit log exports, config backups, incident reports and SLA reports.
• Legal and disputes: contracts, correspondence and signed documents.
• Claims and inspections: photos, survey reports and site records.
• Records and research: datasets, lab notes and published reports.

Compliance

ZeroTamper gives auditors and clients verifiable evidence that a file has not changed since it was anchored. Only the SHA-256 fingerprint goes on the blockchain, never the file. It supports your audit trail but does not by itself make you compliant with any standard or regulation.

Get the ZeroTamper whitepaper

Explore the architecture behind tamper-evident records, cryptographic verification, blockchain anchoring and ZeroTamper verifiable documents.