TLDR

  • CoinShares indicates that a practical quantum threat to Bitcoin is likely over a decade away.
  • Approximately 8% of Bitcoin resides in older addresses, but less than 0.1% faces a realistic risk.
  • Disrupting Bitcoin’s cryptography would necessitate quantum machines far exceeding current capabilities.
  • Bitcoin possesses the ability to implement quantum-resistant upgrades should the threat become more tangible.
  • CoinShares cautions that premature protocol modifications could undermine network stability.

Concerns regarding quantum computers compromising Bitcoin’s security have recently re-emerged within the crypto market. However, digital asset manager CoinShares asserts that this risk remains theoretical and not imminent. In a new research note, the firm stated that Bitcoin has ample time and flexibility to react before quantum computing evolves into a practical threat.

The report characterizes quantum risk as a long-term technical challenge rather than an immediate danger to Bitcoin holders or the network.

Quantum Computing Identified as a Future Challenge

CoinShares clarified that Bitcoin employs elliptic-curve cryptography to safeguard private keys and transactions. Theoretically, advanced quantum computers could utilize algorithms like Shor’s algorithm to deduce private keys from public ones.

Nevertheless, the firm noted that the necessary quantum machines do not yet exist. According to the report, to break Bitcoin’s cryptography within a short timeframe would demand millions of stable, error-corrected qubits. Current quantum computers operate with only a fraction of this capacity.

“Breaking secp256k1 within a practical amount of time needs far more logical qubits than exist today,” CoinShares stated, adding that such technology is probably more than ten years away.

Only a Minor Portion of Bitcoin Is Vulnerable

The report also examined the extent of Bitcoin that could realistically be targeted. CoinShares estimated that roughly 1.6 million BTC, or about 8% of the total supply, is held in older Pay-to-Public-Key addresses where public keys are already visible.

Even within this segment, the firm indicated that the actual risk is considerably smaller. Only about 10,200 BTC is sufficiently concentrated to cause market disruption if stolen. This amounts to less than 0.1% of Bitcoin’s total supply.

Most of the remaining coins are distributed across more than 32,000 distinct unspent outputs. CoinShares suggested that this dispersion would render large-scale attacks slow and impractical, even with advanced quantum systems.

Bitcoin Hashing and Network Security Remain Robust

CoinShares also analyzed Bitcoin’s SHA-256 hashing function, which forms the basis of mining and transaction validation. While quantum computers could accelerate brute-force searches, the report concluded that this advantage would not be sufficient to compromise Bitcoin under realistic assumptions.

The firm asserted that mining security would endure even with steady improvements in quantum hardware. It further noted that fears of a sudden network collapse due to quantum attacks are often exaggerated in public discourse.

The report emphasized that Bitcoin’s design permits gradual adaptation without requiring urgent disruption.

Upgrade Path Available Without Hasty Changes

CoinShares mentioned that Bitcoin has a history of upgrading its cryptography. If quantum risks become more definite, the network could transition to quantum-resistant signature schemes through future software updates.

The firm also pointed out that holders of older addresses can already mitigate exposure by transferring funds to newer address formats. These formats conceal public keys until the coins are spent.

CoinShares advised against rushing protocol changes prematurely. It warned that untested cryptographic systems or forced upgrades could introduce new vulnerabilities and diminish decentralization.