Google introduced a multi-party computation custody platform designed to help banks and financial institutions secure cryptocurrencies and tokenized assets without storing a complete private key in one place. The company unveiled the product, Google Multi-Party Compute (MPC), at its Digital Assets Symposium in New York on Wednesday, Oct. 28.
The service is in private preview, with commercial availability targeted for early 2027.
Key Shares Split Across Separate Environments
Under the model Google described, cryptographic key shares are distributed across separate environments rather than held in a single location. A bank could keep one share on its own hardware, another in Google Cloud, and another with a different provider.
No single participant holds the complete private key. Before a transaction is signed, it can also be checked against institutional policies, including:
- Spending limits
- Approved destinations
- Multi-person authorization requirements
Banks Already Testing the Infrastructure
Google said several major financial institutions are already testing the system, which it is developing as private-key theft has cost the crypto industry billions.
Alphabet, Google's parent company, has itself begun using the technology to secure digital assets on Solana and Ethereum. Google has not disclosed which assets it holds or identified the institutions participating in the testing.
That makes the project more than a theoretical exercise: Google's parent is already a user of the crypto security infrastructure Google wants to sell to financial institutions.
Private-Key Theft Shapes the Timing
The security problem the platform addresses is substantial. Private-key compromises accounted for 43.8% of cryptocurrency stolen in 2024, the largest single category, according to Chainalysis. Total crypto theft reached about $2.2 billion that year.
MPC reduces that single-point-of-failure risk because enough separate key shares must cooperate to authorize a transaction. Compromising one system should not be sufficient to reconstruct the key or move the assets. For banks considering bitcoin, tokenized securities and other blockchain assets, that addresses a security problem traditional custody systems were not originally built to handle.
Post-Quantum Security on the Roadmap
Google's position as a major quantum-computing developer has drawn additional attention to the launch, but the current MPC product is not a post-quantum solution. Its immediate focus is protecting institutions against compromised credentials and unauthorized transactions. Google has said, however, that the architecture could eventually accommodate post-quantum cryptography.
That distinction matters: the immediate story is not that Google has solved crypto's quantum problem, but that one of the world's largest technology companies now treats institutional digital-asset security as a commercial market worth building for. As banks move further onchain, the infrastructure protecting their keys is becoming valuable infrastructure itself.
