Qualified Electronic Time Stamp or Public Ledger Timestamp: the Difference

Two types of timestamp are commonly discussed in the context of document authentication: the qualified electronic time stamp defined by the EU's eIDAS regulation, and the public ledger timestamp produced by recording a hash on a blockchain. They are not the same thing, and they are not interchangeable.

Under eIDAS (EU Regulation 910/2014), a qualified electronic time stamp is issued by a Qualified Trust Service Provider (QTSP) that is listed on a national trusted list. The QTSP binds a hash of the document to a time value from a trusted time source, signs the result with its own qualified certificate, and issues the stamp.

The legal effect: a qualified electronic time stamp has a presumption of accuracy of the date and time it indicates, and a presumption of integrity of the data to which the date and time are bound. These presumptions are recognised across all EU member states.

QTSPs are audited, regulated, and liable. The trust chain is explicit and legally defined.

A public ledger timestamp records a hash of a document in a transaction on a public blockchain — Bitcoin, the XRP Ledger, Ethereum, or others. The transaction is included in a block, which is assigned a block time by the network. Anyone can verify that the hash existed at or before that block time by looking up the transaction.

The legal effect: a public ledger timestamp is not a qualified electronic time stamp under eIDAS. It does not carry the same legal presumptions. Its evidential value depends on the jurisdiction and the context in which it is presented.

What it does provide: a tamper-evident, publicly verifiable record that a specific hash existed at a specific point in time, on a ledger that is not controlled by any single party.

For documents where EU legal presumptions are required — contracts, regulatory filings, notarial acts — a qualified electronic time stamp from a QTSP is the appropriate tool.

For documents where independent, decentralised, publicly verifiable proof of existence is the goal — creative works, research data, internal records — a public ledger timestamp provides a strong and auditable record that does not depend on any single authority.

The two are not mutually exclusive. A document can carry both.

This article is for information only and is not legal advice.