Google is preparing to sell banks a way to hold and move crypto assets without staking the whole vault on a single key. The company showed off Google Multi-Party Compute (MPC) on Wednesday at its first digital assets symposium in New York, positioning the service for commercial release in early 2027. It is in private preview now, and several design partners and large financial institutions are already testing it, Google told CoinDesk. The company declined to name those institutions or disclose pricing.

The product sits on top of an idea that has circulated in crypto for years: split a private key into fragments, scatter them across separate machines and clouds, and require several pieces to agree before a transaction is signed. What…