TESTATUR is a blockchain-based document notarization service that provides professionals and organizations with cryptographic proof of a document's existence and integrity at a specific point in time. The tool is designed to function without file storage, third-party intermediaries, or technical expertise on the part of the user.

Key features and functions include:

Blockchain-Registered Cryptographic Hash TESTATUR generates a unique cryptographic fingerprint of the uploaded document and registers it on both the Ethereum and Polygon public blockchains. The document itself is never uploaded, stored, or transmitted — only its hash is recorded on-chain.

Immutable Timestamping Each registration produces a permanent, tamper-proof timestamp on the public blockchain. The record cannot be altered or deleted, providing date-certain proof of a document's existence at the time of notarization.

Platform-Independent Verification Notarization records can be verified directly on the public blockchain by any party at any time, without requiring access to or dependency on the TESTATUR platform itself.

Downloadable Notarization Certificate Upon completion, the service generates a downloadable certificate documenting the notarization event, suitable for use as supporting evidence in legal, administrative, or professional contexts.

GDPR-Compliant, Zero Data Retention Because no file content is stored or processed beyond hash generation, the service is designed to operate in compliance with GDPR and similar privacy frameworks.

No Technical Knowledge Required The interface is designed for use by non-technical professionals, requiring no familiarity with blockchain technology or cryptographic processes.