Google is entering the institutional crypto custody market with a new security service that allows banks to hold and transfer digital assets without keeping their entire private key in one place. Alphabet, Google's parent company, is already using the technology to secure some of its digital assets on Ethereum and Solana, according to the company.

Google has not disclosed the assets involved, their value, or the names of the banks participating in the preview. Google is positioning it as an option for financial institutions that want to run their own digital asset custody operations without relying on a single provider to control their signing keys.

Google Moves Into Institutional Crypto Custody

For banks handling large amounts of cryptocurrency or tokenized securities, a compromised private key can become a serious financial and operational problem. Google wants to reduce that risk by splitting signing authority across multiple independent systems.

Rather than having a single machine hold the complete private key, the system distributes key shares among different participants. This approach could help banks establish their own custody infrastructure while keeping control over how transactions are approved.

EtherWorld previously covered ZKsync and BitGo's work on bringing bank deposits onchain, where institutional custody, transaction privacy, and blockchain settlement are combined within existing banking frameworks. The growing institutional focus on security is also visible in S&P Global's agreement to acquire OpenZeppelin, which would bring blockchain security expertise into an established financial risk and data business.

How Google's MPC Security System Works

Multi-Party Computation allows several independent parties to jointly authorize a cryptographic operation without revealing their individual secret information to one another. In Google's system, a bank could store one signing key share on its own hardware, another within Google Cloud, and a third with a separate cloud provider.

When a transaction is initiated, the required participants work together to produce a valid signature. Google's documentation describes configurable signing thresholds, meaning institutions can determine how many participants must cooperate before a transfer is authorized.

For example, a two-of-three setup would require two participants to complete the signing process. A five-of-seven setup would require five. The service also includes a policy engine running within Google's Confidential Space infrastructure.

Before signing begins, the engine checks transactions against rules established by the institution. These may include limits on transfer amounts, restrictions on destination wallets, or approval requirements involving multiple departments.

Google's public documentation lists ECDSA signing for Bitcoin, Ethereum, and EVM-compatible networks. Ed25519 support associated with Solana is marked as coming soon, although Google says Alphabet already uses the technology to secure assets on Solana.

The company also plans to accommodate post-quantum cryptography in the future, but has not provided a deployment timeline. MPC is not a complete solution to crypto theft.

Attackers may still target authorized users, exploit weak approval rules, or compromise enough signing participants to meet the required threshold. Banks will need to maintain independent security controls, regardless of which custody technology they adopt.

BREAKING: Alphabet is securing its own digital assets on Solana.

Google unveils Google Multi-Party Compute today, an institutional custody system now in private preview with major financial institutions. Commercial launch early 2027. https://t.co/Wt1Vb71RKU

— Solana (@solana) October 28, 2026

Why Banks Need Better Crypto Custody

Google's announcement comes as banks are testing blockchain systems for payments, tokenized deposits, and financial asset settlement. The challenge is no longer limited to whether a bank can issue a token.

Institutions must also determine who controls those assets, how transfers are authorized, and what happens when their signing infrastructure fails. In March, EtherWorld reported that more than 50 global banks were backing SWIFT's move toward Ethereum-based payment infrastructure.

A separate initiative involving 17 banks and SWIFT's blockchain payment network examined how tokenized deposits could support international transfers while preserving existing compliance processes. Banks are also moving beyond theoretical demonstrations.

In September, Lloyds, NatWest, and Barclays completed live tokenized deposit transactions through the UK's Great British Tokenised Deposit initiative. Meanwhile, Canada's six largest banks began exploring tokenized Canadian dollar deposits for regulated and programmable interbank payments.

That question also applies to stablecoin payments. EtherWorld's coverage of Lloyds and Visa testing USDC settlement showed how digital currencies can be used for cross-border financial obligations.

In What Enterprises Need to Know About Stablecoins, we examined why businesses need clear treasury policies, custody arrangements, and transaction approval processes before using stablecoins. Google's MPC service could provide one component of that infrastructure.

Google Targets 2027 as Custody Competition Grows

Google plans to make its MPC service commercially available in early 2027, placing it in competition with established digital asset security providers such as Fireblocks, Fordefi, and BitGo. These companies already offer institutional products for wallet security, transaction signing, and asset management.

Google brings its cloud infrastructure, enterprise security products, and relationships with major financial institutions to the market. Google has not disclosed pricing, identified its participating banking customers, or published independent performance comparisons with competing custody systems.

For banks, the decision will involve more than comparing security features. They must also evaluate vendor dependence, operational resilience, regulatory requirements, and the cost of integrating new infrastructure.

EtherWorld covered how five US banks began testing private blockchain settlement using ZKsync infrastructure, while institutional interest in Ethereum has expanded into tokenized assets, stablecoins, and settlement systems. These developments are creating demand for secure ways to hold and transfer blockchain-based assets.

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• Lloyds, NatWest & Barclays Execute First Tokenized Deposits
• Canada's Big Six Banks Explore Tokenized Deposits

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