Quantum this, quantum that…who put a stupid cat on-chain!?

Ahem. 

Alright, let’s be serious. The threat that a viable, actually functioning, quantum computer would pose to Bitcoin if it were to be built is very serious. It is the concrete example of an existential threat, in every sense of the word. 

One of the bedrock foundations that Bitcoin rests upon is the assumption of a functioning cryptographic system that can be used to produce unforgeable signatures, i.e. that if you follow that system’s protocol properly when signing things, there is no way that anyone but a bitcoin’s rightful owner could produce a signature needed to spend it unless the rightful owner…

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