The price of the representative cryptocurrency Bitcoin has currently fallen to about half of its peak reached in October 2025. One of the reasons cited is the potential threat posed by quantum computers to the security of virtual currencies. On one hand, companies holding Bitcoin and exchange operators are denying the risks...

The price of the representative cryptocurrency (virtual currency) Bitcoin has plummeted and is currently fluctuating at about half of its peak reached in October 2025. The reasons are believed to include investor risk aversion and delays in the easing of restrictions in the United States. Against this backdrop, quantum computers have emerged as a new risk factor. Due to the potential to undermine the security of virtual currencies, this has sparked a major controversy.

One of the opportunities considered is a report released in September 2025 by two researchers from the Federal Reserve Board (FRB) and the Federal Reserve Bank of Chicago.

Bitcoin uses blockchain (distributed ledger) technology. Data is considered virtually unchangeable, with very low risk of tampering. In their report, the two analysts stated that although tampering with data is currently difficult, if transaction data is stored first, the emergence of sufficiently powerful quantum computers in the future could potentially crack it. They pointed out, “We need to thoroughly address the privacy risks of data.”

Currently, quantum computers are believed to be in the development stage, and the risk of data being immediately cracked is very low. Even so, after the downward trend in Bitcoin intensified in January, this has become a negative factor circulating in the market.
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According to multiple American media reports, Christopher Wood, the global head of stock investments at Jefferies Group, a US securities firm known for its bullish stance on cryptocurrencies, revealed in January that he had removed Bitcoin from his investment portfolio. He pointed out that if quantum computing becomes widespread, the possibility of cracking Bitcoin’s code will increase. He warned that this could pose a threat to Bitcoin’s survival.