Google quantum threat to BTC by 2029 + MicroCloud $400M upgrade + Circle Arc
Key Questions
What quantum computing threat does Bitcoin face?
Under 500k qubits could break 6.7M BTC (32%) in 9 minutes via hybrid ECDSA/post-quantum attacks, per Google/Caltech/MicroCloud.
What is MicroCloud's role in quantum resistance?
MicroCloud plans $400M investment in Bitcoin post-quantum upgrades, developing hybrid ECDSA and soft forks for quantum-era security.
How is Circle addressing quantum threats?
Circle's Arc L1 blockchain has a quantum-resistant roadmap for wallets/validators in 2026. Initiatives like Armstrong Council/BIP-360/$150M protect COIN custody/ETFs/Base.
<500k qubits break 6.7M BTC/1.7M vulnerable (P2PK/Satoshi 1M; Grayscale social consensus/burn/slow/nothing/Mow sig bloat); Google/Caltech/MicroCloud hybrid ECDSA/post-quantum; Circle Arc L1 quantum-resistant '26; Armstrong Council/BIP-360/$150M/Saylor protects COIN custody/ETFs/Base; COIN ~$170 (bull FV $383).
Sources (2)
Updated Apr 8, 2026