Title: Quantum Computing and Bitcoin: Is There a Real Threat?
The debate about quantum computing threatening Bitcoin security has resurfaced with Google’s release of its quantum computer, Willow. Despite its advancements, Bitcoin users have little to worry about for now.
Key Points:
Bitcoin’s security relies on hash functions (mining) and elliptic curve signatures (transactions). Quantum algorithms like Grover’s and Shor’s could theoretically affect both.
However, Willow operates with only 105 physical qubits, far below the millions needed to pose a real threat.
Hash functions remain relatively secure, as Grover’s algorithm merely accelerates computation. Signature-based vulnerabilities arise only with reused addresses exposing public keys.
What Can Be Done?
1. Quantum-resistant cryptography (e.g., Lamport signatures) can be introduced via soft forks.
2. Users can stay safe by:
Frequently changing receiving addresses.
Avoiding address reuse.
Using secure SegWit addresses.
While quantum computing may impact Bitcoin and other systems like Ethereum in the future, no immediate danger exists. Developers and users alike must remain vigilant and adopt best practices to stay ahead.
