# Google's MPC Custody System Splits Signing Control Across Providers By Simon Yoon Canonical URL: https://www.tokenpost.com/news/technology/42633 Published: 2026-10-28T13:46:19.000Z Updated: 2026-10-28T13:46:19.000Z Section: Technology > Alphabet uses the service for digital assets on Ethereum and Solana. Institutions can set approval thresholds such as two of three or five of seven shares. The planned service would give banks and other financial institutions a way to secure crypto and tokenized assets. Alphabet already uses the service to protect its digital assets on Ethereum and Solana. Google also plans to demonstrate the product at New York’s first Digital Asset Symposium. Google’s [custody service]() uses multi-party computation, which divides control of transaction signing among separate systems. Private-key shares are stored across Google Cloud, an institution’s own hardware and other cloud providers. This setup distributes signing authority instead of keeping the full key in one place. Before signing a transfer, the system checks it against conditions such as transaction limits, destination addresses and approval requirements across multiple departments. Institutions can choose signing thresholds such as two-of-three or five-of-seven, requiring the specified number of shares to approve a transaction. Those controls let organizations set how transfers are reviewed before they are signed. At commercial launch, the service is planned to support ECDSA and Ed25519 signatures. A later upgrade to post-quantum cryptography is possible, but no timing for that change has been announced. Pricing has not been announced, and the early 2027 target does not include a specific release date. The planned service would compete with custody providers Fireblocks, Fordefi and BitGo. Its commercial launch would move the product beyond the private-preview stage; it is not yet commercially available. ## Links in this article - [custody service](https://www.tokenpost.com/news/technology/42606)