Google unveiled Multi-Party Compute, a crypto custody system built on split-key architecture, at its first digital assets symposium in New York today. The product applies multi-party computation to signing keys, distributing them across separate systems rather than storing them in a single location. Several financial institutions are already testing it in private preview. Alphabet has begun using the system to secure its own operations.
The move marks Google’s entry into institutional-grade custody infrastructure, a space dominated by specialist firms like Fireblocks, Coinbase Prime, and BitGo. Multi-party computation isn’t new, it’s been the foundation of MPC wallets for years, but Google’s scale and cloud footprint give it distribution that pure-play custody providers can’t match. Banks and asset managers already run workloads on Google Cloud; now they can custody digital assets inside the same environment.
Split Keys, Distributed Trust
The architecture splits a signing key so that no single system holds the complete private key. Each party in the computation holds a fragment, and the signature is reconstructed only during the signing process. If one fragment is compromised, the key remains secure. It’s the same approach used by Fireblocks’ MPC engine and Coinbase’s WaaS platform, but delivered as a Google Cloud service rather than a standalone custody product.
Google plans commercial availability in early 2027. Pricing hasn’t been disclosed, though enterprise custody typically involves both per-transaction fees and minimum monthly commitments. Financial institutions in the private preview cohort can test the system against their existing custody workflows before the broader rollout.
Alphabet Eats Its Own Dog Food
Alphabet’s decision to use Multi-Party Compute for its own assets is a material data point. The company isn’t just building a product for third parties, it’s staking its own exposure on the architecture. That matters in a market where custody failures have wiped out billions. FTX, Celsius, BlockFi, and Mt. Gox all went down because keys were mismanaged or outright stolen. A custody system with Google’s reputation behind it could pull institutional capital that’s been sitting on the sidelines since those collapses.
The timing aligns with the broader institutional onboarding wave. Spot Bitcoin ETFs launched earlier this year, pulling in tens of billions in assets under management. Asset managers are now looking at Ethereum, Solana, and tokenized securities, all of which demand custody infrastructure that can meet bank-grade compliance and security standards. Google’s entry signals that cloud providers see crypto custody as a core enterprise service, not a niche offering for crypto-native firms. If it works, AWS and Azure won’t be far behind.
