Quantum computing’s accelerating breakthroughs are forcing the crypto sector to confront a long-anticipated question.
How long before quantum machines can break Bitcoin security?
Blockchain analytics firm Chainalysis, in a report published on Nov. 19, estimates that sufficiently powerful quantum systems capable of cracking Bitcoin’s elliptic curve cryptography could emerge within 10 to 15 years, placing the industry on a firm countdown toward quantum readiness.
The warning follows rapid progress in the field, including Google’s recent demonstration of quantum processors operating thousands of times faster than classical supercomputers.
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While these systems cannot yet threaten blockchain networks, analysts argue that the pace of improvement is narrowing the gap faster than many expected.
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Why quantum matters for Bitcoin and Ethereum
Bitcoin (BTC) and Ethereum (ETH) rely on widely used cryptographic standards, ECDSA for signatures and SHA-256 or Keccak-256 for hashing, that remain secure against classical attacks.
However, Shor’s algorithm could, in theory, derive private keys from exposed public keys. That risk is especially relevant for early Bitcoin addresses, including Pay-to-Public-Key wallets, which hold an estimated hundreds of billions of dollars’ worth of BTC.
Security researchers continue to stress that a quantum attack on Bitcoin would require millions of stable qubits, far beyond today’s error-prone machines. Still, the “harvest now, break later” model remains a concern: Malicious actors can store public-key data today and decrypt it in the future once quantum machines mature.
Building the quantum-resistant roadmap
The roadmap toward protection is already emerging. Governments and research labs are standardizing post-quantum cryptography, with lattice-based schemes such as CRYSTALS-Kyber and Dilithium offering quantum-resistant alternatives.
Blockchain developers are exploring hybrid cryptography, new address types and gradual migration frameworks to ensure backwards-compatible upgrades.