Zeros

Google Cloud has introduced a preview-stage MPC key management service for institutional Bitcoin custody, with general availability planned for early 2027 .  By design , the lone private key that once sat at the heart of the security setup— that long-standing single point of failure —is gone; instead , key shares are distributed across hardware-backed environments, and no party, custodian or counterparty alike, ever holds or reconstructs a complete key. Several details follow. Distributed key shares move across Google Cloud, on-premises hardware, other clouds, or compact devices , and signing takes place via a multi-party protocol in which the master key is never assembled— a parliament of shards , so to speak, producing a signature without any member seeing the whole. The system is built on the DKLS23 protocol, supported by threshold signatures in configurations such as 2-of-3 or 5-of-7: attacks below the threshold fail , and the system holds as lo...