Bitcoin, along with other cryptocurrencies, is likely to be among the first to face the practical dangers posed by quantum computing, which could potentially crack complex encryption systems. This assertion was made by Eddie Zervigon, CEO of Quantum Xchange, during a discussion with CoinDesk.

"Cryptocurrencies are the canary in the coal mine," Zervigon stated.

Zervigon noted that initial attacks would likely target blockchain protocols due to their decentralized nature.

This scenario would serve as an indicator of the emergence of a cryptographically significant quantum computer, capable of breaking elliptic curve cryptography, which secures Bitcoin signatures and the encryption of banking infrastructure.

According to Zervigon, major corporations investing billions in quantum technology, such as Microsoft and IBM, are generally expecting the arrival of a commercially and cryptographically relevant quantum system around 2029.

This timeline is supported by recent hardware estimates. Researchers at Google have revised down the required quantum capabilities needed to compromise Bitcoin. Their calculations suggest that less than 500,000 physical qubits will be necessary to attack elliptic curve cryptography, which is 20 times lower than previous estimates.

Furthermore, the U.S. government is also sending signals. The Department of Energy anticipates developing a powerful quantum computer within three years, while federal agencies have mandated a transition to post-quantum cryptography.

"This starts the clock. It creates a sense of urgency," Zervigon added.

Vulnerability Insights

According to a report from Deutsche Digital Assets, cited by CoinDesk, the primary vulnerability of Bitcoin in the context of quantum computers lies not in the weakness of its algorithms, but rather in its slow decision-making process. In contrast to traditional finance, implementing changes in the blockchain takes a considerable amount of time.

The firm pointed out that an investment bank like JPMorgan does not need to seek approval from millions of participants worldwide to update its cryptographic infrastructure. Typically, a decision from the board of directors or key investors suffices.

In comparison, a public decentralized blockchain will transition to post-quantum standards more slowly and unpredictably. Deutsche Digital Assets emphasized that this is not an argument against Bitcoin, but rather highlights a governance issue within the system.

A 2024 academic paper titled "Downtime Required for Bitcoin Quantum-Safety," published on arXiv, supports this reasoning. The authors note that achieving 90% consensus among miners on specific upgrade parameters is necessary before any upgrade can begin.

Historically, significant changes to the network have faced strong opposition. A notable example is the SegWit upgrade in 2017, where deep community divisions resulted in multiple versions through hard forks, including Bitcoin Cash and Bitcoin Gold.

Additionally, Charles Hoskinson, the founder of Cardano, has acknowledged that Bitcoin might lose its leading position due to the quantum threat.