BitGo CEO Mike Belshe has outlined three critical quantum computing challenges facing Bitcoin. According to his analysis, two of these challenges already have feasible solutions available, but the third remains a significant hurdle and could affect asset mobility. His comments underline growing industry concern as quantum technology continues to mature.
Those concerns gained fresh momentum after Google researchers reported a major error-correction milestone on the company's Willow quantum chip. The technique, called magic state cultivation, reportedly reduced relevant error rates by a factor of 40 and achieved a record 99.99% accuracy. Magic states are a specialized resource in quantum computation that can consume about 95% of a quantum computer's capacity, so improving their reliability could ease a key bottleneck in building larger fault-tolerant machines.
Despite the breakthrough, the immediate threat to Bitcoin's cryptographic security remains unchanged. A Google white paper previously estimated that breaking Bitcoin's security would require between 1,200 and 1,450 logical qubits, not just raw physical qubits. Google's Willow chip has 105 physical qubits. IBM has reported 70 logical qubits, with a roadmap targeting 200 logical qubits by 2029 and 2,000 by 2033. QuEra has executed algorithms using up to 96 logical qubits. These figures show a substantial gap between current capabilities and an attack-capable quantum machine.
The longer-term risk is still taken seriously. An estimated 6.26 million BTC sits in quantum-vulnerable addresses. Casa co-founder and chief security officer Jameson Lopp said a machine powerful enough to decode a Bitcoin public key could be at least another decade away. Polymarket currently assigns a 1% chance to that possibility by year-end and 11% by the end of 2027. Bitcoin's price remains in the $64,000 to $65,000 range, a battleground for buyers and sellers, while traders weigh these long-dated security questions against the market's immediate technical signals.
