Whereas even the most powerful supercomputer would take thousands of years to crack Bitcoin, there are machines that could, theoretically, do so in a matter of seconds. The keys to the $163 billion castle would be yours-of course, in that scenario, Bitcoin’s price would surely plummet as soon as its claims of invulnerability were found to be baseless. Since the private key to each wallet can be derived from a public key, you could access the Bitcoin wallet of whomever you wished. You could credit your account with free Bitcoin or prevent others from making transactions. If you had a powerful enough computer, you could, theoretically, take control of the Bitcoin blockchain. A quantum computer capable of cracking Bitcoin's encryption could be just two years away.The current generation of quantum computers max out at 54 qubits.
A 4,000 qubit quantum computer could, theoretically, crack Bitcoin's encryption in a matter of seconds.
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