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Institutional crypto custody combines control of transaction authority with client records, approval procedures, asset segregation, and the ability to return assets or access to them. A wallet does not hold coins like a physical safe: it manages the cryptographic means used to authorize transactions and tracks ledger addresses or accounts. To understand a custody arrangement, look separately at what the ledger shows, how the custodian attributes assets to each client, who can authorize a transfer, and what the law and custody agreement say about ownership and return.
What happens when an institution moves a client’s crypto?
A transfer typically passes through several linked checks. The precise systems and sequence vary by institution and service arrangement, but the operating logic is broadly the same:
- Instruction: A client or authorized employee requests a transfer, trade, or withdrawal.
- Entitlement and policy checks: The institution checks that the requester is entitled to act, that the requested amount is available in the client’s position, and that the destination and transaction comply with applicable controls.
- Approval: Required people or an approved signing system authorize the transaction under the institution’s policy.
- Signing and broadcast: The signing arrangement authorizes a blockchain transaction, which is then sent to the relevant network.
- Monitoring and recordkeeping: The institution tracks the transaction’s status and updates client position records and operational books to reflect the movement.
The ledger records the network transaction; the custodian’s records connect that activity to a client’s position. Those records, authorization controls, safe-transfer procedures, and arrangements for returning assets or access are all part of custody—not optional administrative details.
What does a wallet hold, and where are the keys?
A wallet is software, hardware, or a combination of systems that manages the means of authorizing transactions and tracks ledger addresses or accounts. The crypto-assets themselves are represented on a distributed ledger; the wallet’s signing authority is what permits a transaction from an address. “Where the keys are held” is therefore not always a question about one complete key sitting in one location. Depending on the design, signing authority may be controlled through one key, multiple keys, or components used together.
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For an institutional arrangement, ask who controls the signing authority and its components, who may initiate and approve a transaction, how policy checks are enforced, and how access is restored if a signer or component becomes unavailable. A wallet label or a provider’s description does not answer those governance and recovery questions by itself.
How do omnibus and segregated wallets differ?
These terms can describe different layers of an arrangement. An omnibus wallet pools on-chain holdings for multiple clients, while the custodian maintains internal records attributing a position to each client. A client-specific wallet or account can make attribution more direct at the ledger level. Neither structure, by itself, settles every question about legal ownership or what happens if a provider becomes insolvent.
| Layer | What it describes | What to verify |
|---|---|---|
| On-chain wallet or address structure | Whether holdings appear in client-specific addresses/accounts or are pooled in an omnibus wallet. | How client assets are separated from the provider’s own holdings, and whether clients share omnibus wallets. |
| Client accounting | The provider’s internal position records assigning holdings and movements to individual clients. | How records are maintained, reconciled, and used to process transfers and returns. |
| Legal ownership and insolvency treatment | The rights clients have under the governing law and custody agreement, including if the provider fails. | Whether legal and operational segregation is effective under the applicable law, and how assets are treated in insolvency. |
In the European Union, MiCA Article 75 requires providers to segregate clients’ crypto-assets from their own holdings and to ensure legal and operational segregation in the clients’ interest according to applicable law. It also requires a custody agreement, a register of client positions, and procedures for returning crypto-assets or the means of access. The implementing rules call for disclosures about wallet separation and, when clients share omnibus wallets, how those clients’ assets are segregated. A statement showing a client balance is not by itself proof of legal segregation; the contract and governing law matter. FINMA has also highlighted the added legal complexity of cross-border custody if a provider becomes insolvent.
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How do MPC and multisignature work in custody?
Both can distribute transaction authority, but they do so through different cryptographic approaches. The relevant question is not which acronym a provider uses; it is how its design and operating policy control an actual transaction.
Multisignature
A multisignature arrangement requires multiple keys or signatures according to the rules of the relevant blockchain. The institution should establish who controls each required signer, how approvals are separated, and what happens when a signer is unavailable. Supported assets and networks matter because multisignature behavior depends on the relevant blockchain’s capabilities.
Multi-party computation (MPC)
MPC is a family of techniques in which participants jointly produce a signature without relying on one participant to authorize alone. Implementations differ, so the term does not specify who controls signing components, how approval policy works, or how recovery is handled.
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For either approach, evaluate the actual approval policy, component custody, policy checks, recovery design, auditability, supported assets, and operational dependencies. EU implementing rules require relevant applicants to describe key approval and safeguarding arrangements, including for multisignature wallets. A 2025 SEC-hosted discussion draft describes backup-key distribution as one design consideration for addressing signer unavailability, incapacity, or key loss; it is a discussion draft, not an adopted SEC standard or binding requirement. No single signing design is established as universally safer, faster, or more compliant.
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How does custody affect settlement and liquidity?
Settlement is the completion of a trade or transfer through movement of the relevant assets and corresponding records. If a client’s position changes while holdings remain in an omnibus on-chain wallet, the provider may update internal records without moving assets on-chain. An external transfer or withdrawal, by contrast, requires a blockchain transaction. Practices vary, so an internal record change should not be assumed to describe every exchange or custodial trade.
Custody affects how ready an institution is to act, what integrations it needs, and how much it depends on providers or intermediaries:
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| Operating model | Potential benefit | Questions and trade-offs |
|---|---|---|
| Institution-operated self-custody | Direct control and the ability to integrate directly with ledger activity. | Can the institution provide the staffing, technical controls, recovery, monitoring, and post-trade systems the model requires? |
| Exchange-based wallet | Convenient connection to trading and liquidity. | What counterparty exposure, pooling, withdrawal controls, and asset-use terms apply? |
| Third-party custodian | Specialized custody infrastructure and operational processes, potentially including on- and off-ramps. | What are the legal relationship, segregation, signing authority, recovery plan, sub-custodian chain, fees, and settlement process? Outsourcing can add risk-management dependencies and latency to on-chain settlement. |
| Wallet-as-a-service or platform wallet | Integration across trading or other digital-asset activity. | Does the integration justify its cost and complexity, and who controls signing and operational policy? |
These are qualitative trade-offs, not measured performance rankings. An institution may combine models for different liquidity and security needs, subject to its obligations. Settlement time and finality cannot be reduced to one number for all crypto-assets: they depend on the ledger, transaction conditions, custody workflow, and any intermediary or contractual process. For a particular asset and provider, verify the applicable confirmation policy and service commitments rather than assuming a universal threshold.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which regulatory requirements apply?
Custody rules and supervisory positions depend on jurisdiction, institution type, and date. The following are distinct examples, not a single global standard.
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On July 14, 2025, the Federal Reserve, FDIC, and OCC issued a joint statement on risk-management considerations for bank crypto-asset safekeeping. The agencies said it discusses existing risk-management principles and “does not create any new supervisory expectations.” It should not be described as a new custody rule.
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In a May 7, 2025 release, the OCC said Interpretive Letter 1184 confirmed that national banks and federal savings associations may buy and sell assets held in custody at a customer’s direction and may outsource bank-permissible crypto custody and execution, subject to appropriate third-party risk management. It also said custody—including through a sub-custodian—must be conducted safely and soundly and in compliance with applicable law. This authority should not be generalized to every U.S. institution or state.
European Union: MiCA
MiCA Article 75 addresses custody agreements, client-position registers, procedures for returning assets or means of access, segregation of client and provider holdings, and legal and operational segregation in the client’s interest according to applicable law. It also addresses liability for loss attributable to the provider. The implementing regulation specifies disclosures on wallet separation, client segregation in shared omnibus arrangements, key approval and safeguarding, custody policy, operational and ICT risks, third-party delegation and oversight, and return procedures.
Switzerland: FINMA guidance
In its January 12, 2026 announcement for Guidance 01/2026, FINMA pointed to ledger technology, the need for expertise and robust infrastructure, cross-border custody and insolvency complexity, and provider oversight. It said responsibility remains with authorized financial institutions when they use providers. The announcement is not a substitute for the full guidance or applicable Swiss law.
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How should an institution evaluate a custody arrangement?
Compare the arrangement against the institution’s legal duties, intended activity, and operational needs—not just the wallet type or signing technology. A practical review should cover:
- Jurisdiction and legal status: Which laws and regulatory obligations apply to the institution, provider, assets, and custody relationship?
- Segregation and records: How are client holdings separated from provider holdings, what is pooled on-chain, and how are client positions reconciled?
- Signing authority: Who can initiate and approve transfers, how are approvals separated, and how are policy controls applied?
- Recovery and resilience: What happens if a key component, signer, system, or service becomes unavailable?
- Transfers and liquidity: What withdrawal controls, operational steps, and settlement processes apply to the institution’s intended use?
- Outsourcing: Are sub-custodians or other service providers involved, and how are their roles and risks overseen?
- Assets and integration: Which assets and ledger networks are supported, and what trading, monitoring, investment-management, or post-trade systems must connect?
- Costs and failure rights: What fees apply, and what rights and procedures govern access to or return of assets if the provider fails?
The right arrangement depends on the institution’s strategic, operational, and regulatory requirements. Cryptographic controls cannot replace clear client records and legal protections; legal segregation cannot replace secure signing, approval, monitoring, and recovery procedures.
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