RE: How Quantum Computing Threatens Bitcoin16 Jun 2025 14:55
As of 2025, the most advanced quantum computers have around 100–1,000 qubits.
Breaking Bitcoin’s ECDSA within a practical timeframe is estimated to require anywhere from 6,000 to 317 million physical qubits, with more conservative estimates for practical attacks starting at around 13 million qubits.
Google’s recent research suggests that the number of qubits needed to break 2048-bit RSA encryption has dropped from 20 million to under 1 million, thanks to algorithmic improvements. While Bitcoin uses ECC (not RSA), this shows the pace of progress may be faster than previously thought