  Bitcoin is a digital currency and payment system based on classical
cryptographic technologies which works without a central administrator such as
in traditional currencies. It has long been questioned what the impact of
quantum computing would be on Bitcoin, and cryptocurrencies in general. Here,
we analyse three primary directions that quantum computers might have an impact
in: mining, security, and forks. We find that in the near-term the impact of
quantum computers appear to be rather small for all three directions. The
impact of quantum computers would require considerably larger number of qubits
and breakthroughs in quantum algorithms to reverse existing hash functions.
