  The development of quantum information platforms such as quantum computers
and quantum simulators that will rival classical Turing computations are
typically viewed as a threat to secure data transmissions and therefore to
crypto-systems and financial markets in general. We propose to use such
platforms as a proof-of-work protocol for blockchain technology, which
underlies cryptocurrencies providing a way to document the transactions in a
permanent decentralised public record and to be further securely and
transparently monitored. We reconsider the basis of blockchain encryption and
suggest to move from currently used proof-of-work schemes to the proof-of-work
performed by analog Hamiltonian optimisers. This approach has a potential to
significantly increase decentralisation of the existing blockchains and to help
achieve faster transaction times, therefore, removing the main obstacles for
blockchain implementation. We discuss the proof-of-work protocols for a few
most promising optimiser platforms: quantum annealing hardware based on D-wave
simulators and a new class of gain-dissipative simulators.
