The main focus of this article will be to answer the following questions: How many Bitcoins could be stolen now if a sufficiently large quantum computer was available? More about Blockchain technology? These wallets store private keys people need to access their assets recorded on the blockchain. In this case the security of the Bitcoin blockchain will be fundamentally broken. Two cutting-edge technologies that promise to revolutionize entire fields may be on a collision course. Visit our privacy policy for more information about our services, how we may use, process and share your personal data, including information on your rights in respect of your personal data and how you can unsubscribe from future marketing communications. We will therefore not discuss this in detail, but only explain the aspects that are relevant for the analysis in this article. The latter describes a qubit that achieves a superposition between 1 and 0 via a quantum gate. This would allow an adversary who has a quantum computer to spend the coins that the address had. Imagine that someone manages to build a quantum computer today and is therefore able to derive private keys.