Google Cloud has detailed a preview service for institutional Bitcoin custody that lets financial institutions jointly authorize and sign cryptocurrency transactions without giving any one party control of the full private key.

Bitcoin custody service remains in preview

Google Cloud updated documentation for its Multi-party Compute, or MPC, service on October 26, 2026. The product remains in preview and is provided as is, with potentially limited support.

Release notes for the service date back to August 2026. On October 1, Google expanded its Bitcoin security rules to evaluate transaction amounts, identify destination address types and detect change outputs.

How multi-party signing works

Multi-party computation allows participants to collaborate on signing without concentrating control of the full private key in one party.

In an earlier reference architecture for blockchain signing, Google Cloud described how holders of distributed key shares could collaborate on a transaction using Confidential Space. That architecture is separate background and does not establish the features or availability of the new preview service.

The documentation update preceded Google Cloud’s MPC Symposium, scheduled for October 28 in New York. The event description promised a revealing of Google’s MPC product and research projects.

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