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I've seen some people telling scary stories about the emerging quantum computers, and their potential effect on cryptocurrencies. The short version is that it will be trivial to calculate any Bitcoin with a quantum computer, thereby making it easy to steal/decode and take as much as they want. With two different quantum computers having passed initial proof of concept and working in prototype stage, I figure we are 2-5 years from them reaching research-level stability, if not actual commercial products. Is the only thing protecting cryptocurrencies the complexity of decoding? Does quantum computing draw an end date in some way? My brain is not big enough to process this alone...