Abstract
By Christoph Sorge and Maximilian Leicht. Blockchain technology, introduced in the Bitcoin blockchain in 2009, can be used to ensure the integrity of data using a distributed consensus algorithm, executed by a potentially large number of participants. A variety of blockchain applications have been proposed in recent years. The distributed nature of blockchains is advantageous in many respects but can be challenging from a legal and regulatory perspective. The European eIDAS regulation, for example, regulates trust services—but it assumes these services to be provided by individual trusted entities instead of multiple collaborating parties. We show how a particular eIDAS service, (qualified) electronic time stamps, can be seen as competing with blockchain technology. Both concepts can be used to provide proof of the existence of specific data at a certain point in time. On this basis, we explain to which extent a combination of both concepts is possible and useful in practice. This is founded on both technical and legal arguments. If the combination gains practical relevance, it may endanger a business model of trust service providers, possibly necessitating action by the state.
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