Квалифицирано времеотбелязване – какво е и как работи

Qualified electronic timestamping (QeTS) is a cryptographic operation that binds an exact date and time to a digital document — in a way certified by an accredited third party. The result is a Time-Stamp Token (TST): a signed package per RFC 3161 containing the SHA-256 hash of the file, Coordinated Universal Time (UTC), and the certificate of the Trust Service Provider (TSA).

How it works technically

StampR computes the SHA-256 hash of your file server-side — the original content never leaves your device in readable form. The hash is sent to BORICA – B-Trust (an accredited QTSP on the EU Trust List), which returns a TST signed with its qualified certificate. StampR binds the TST to your authorship declaration and generates a PDF certificate with a QR code for public verification.

Legal standing under eIDAS

EU Regulation 910/2014 (eIDAS), Article 41, grants qualified electronic timestamps a presumption of accuracy of the date and time and integrity of the data — automatically recognised across the EU. In a dispute, the opposing party must prove the timestamp invalid, not you prove it valid.

RFC 3161 and ETSI EN 319 422

RFC 3161 is the internet standard defining the request/response protocol between client and TSA. ETSI EN 319 421 and EN 319 422 are the European profiles built on RFC 3161, adding audit requirements, key security, and long-term validity. The B-Trust TST complies with both, enabling independent verification with any standard tool (OpenSSL, BouncyCastle, etc.).

Qualified vs ordinary timestamp

An ordinary timestamp (server metadata, blockchain entry) is not issued by an accredited provider and carries no automatic legal presumption. The qualified eIDAS timestamp is the only one legally equivalent to a notarial act for date and content across the EU.

Issue a qualified timestamp at StampR — €2.50, under 2 minutes, valid before courts in Bulgaria and the EU.