Quantum computing, but before it could destroy the whole internet
QC is just a myth,.. is not a threat at all. People using QC as excuse against Bitcoin they know nothing about Bitcoin and also about QC.
The security of Bitcoin was designed to be upgraded in a backward-compatible manner and could be upgraded if deemed an imminent threat (cf. Aggarwal et al. 2017, "Quantum Attacks on Bitcoin and How to Protect Against Them").
The risk of quantum computers also exist for financial institutions such as banks, because they depend heavily on cryptography when transacting.
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