Microsoft Majorana 2 Chip Heightens Quantum Threat to Bitcoin Cryptography

On June 4 2026 the story intensified as Microsoft unveiled its Majorana 2 topological chip, claiming 1,000× qubit reliability and coherence times of 20 seconds to one minute. The announcement builds directly on the morning’s joint release with Atom Computing and EeroQ that showed parity-state stability extended from 10 ms to 20 s and error-correction sustained across 90 measurement rounds. Microsoft now projects a cryptographically relevant quantum computer by 2029, prompting Glassnode to flag roughly 6 million BTC ($469 billion) as potentially exposed and underscoring the urgency for post-quantum upgrades across major blockchains.