As per the latest, Google has reached Quantum Supremacy. Meaning it could potentially decode an entire blockchain and...
YOUR PRIVATE KEYS...
Blockchains are secured through elliptic curve cryptography (ECC), just like encrypted user data and website traffic. Now the issue is that ECC is NOT "quantum-safe" meaning that a quantum computer could theoretically decrypt a user's private keys and forge transaction signatures.
Is this the end of Crypto?
I don't think so, but I'd love to hear your opinions too! (Especially the opinion of a cryptographer)
source
https://www.coindesk.com/what-googles-quantum-supremacy-means-for-the-future-of-cryptocurrencySpreading news, articles, or anything about quantum computing going to crush down blockchain because of its ability of decrypting private keys and breaking blockchain supported security might affect bitcoin's reputation and users for it might deploy panic and scare to investor, traders and users. Because one of the biggest asset of bitcoin is the anonymity it gives to every transaction and user's addresses, and losing it might affect bitcoin big time. But, this claim could not be possible if people behind blockchain will take an action to counter the threat.