Google Multi-Party Compute uses a policy engine running inside Google Cloud Confidential Space to check transactions against spending caps, destination restrictions, and multi-person authorization rules before signing.

From the articleGoogle Builds Crypto Custody Security Platform for BanksAlso in Google Previews Key-Splitting Crypto Custody Tool For Banks, Google to launch secure multi-party computing service for crypto wallets - SiliconANGLE, Google to preview a new crypto security system as private-key hacks mount, Google previews crypto custody security system for banks ahead of 2027 launch, Google Pitches Banks on Splitting Crypto Keys Across Clouds With New Custody Service - Unchained