A digital-asset fund expanding into – or structured to accept capital from – the United States faces a custody question that cannot be answered by picking a nominee director and a Cayman shell. Custody arrangements for funds in the United States sit at the intersection of federal securities law, state money-transmission licensing, and the practical realities of banking and safeguarding digital assets across multiple classes. Getting this wrong does not merely invite a regulatory comment letter; it can block institutional capital, trigger state enforcement, and – in a worst case – invalidate the fund's legal capacity to hold assets on behalf of its investors.
The short answer is this: a fund manager advising or managing assets for US persons, or holding digital assets that constitute securities, must map its custody obligations against the federal Investment Advisers Act regime, the Securities and Exchange Commission (SEC) qualified-custodian rules, and – where the fund holds or moves value that state regulators characterise as money transmission – the applicable state money-transmitter licensing (MTL) regime. No single federal custody regime covers all digital-asset types; the analysis turns on how the underlying token is classified.
This page sets out the regulated basis for custody, the practical steps for structuring a compliant arrangement, the cross-border interaction with tax and banking, and the decision points that matter most for fund managers approaching the US market.
What Custody Means for a Digital-Asset Fund in US Law
Custody obligations for a fund manager in the United States are not uniform – they depend on whether the fund's assets are characterised as securities, commodities, or neither. Under the SEC's investment adviser custody rules, an adviser with custody of client funds or securities must use a qualified custodian (a bank, broker-dealer, futures commission merchant, or foreign financial institution meeting the applicable standard). For digital assets that the SEC treats as securities, this requirement applies directly. For assets the Commodity Futures Trading Commission (CFTC) regulates as commodities, a parallel but distinct set of segregation and custodial obligations applies. For assets that fall outside both categories, the analysis drops to state law.
State money-transmission law adds a second layer. Where a fund – or its manager – holds digital assets on behalf of investors in a way that a state regulator characterises as money transmission, a state MTL is required. The New York Department of Financial Services (NYDFS) BitLicense is the most demanding of these regimes: it requires, among other things, specific cybersecurity standards, capital maintenance, and custodial controls for virtual currency held on behalf of customers. Other states operate under money-services-business frameworks that may or may not expressly cover digital assets, with the scope of coverage varying significantly.
In our practice, we see fund managers – particularly those structuring vehicles offshore for US tax efficiency – routinely underestimate the state-level custody exposure. A Cayman-domiciled fund with a Delaware-registered manager and New York-based investors may face NYDFS scrutiny even if the manager itself is not a BitLicense holder. The entity map and the investor map must both be drawn before custody arrangements are finalised.
The Federal Custody Regime for Digital-Asset Funds
Under the SEC's investment-adviser custody rules, any investment adviser registered or required to register with the SEC that has custody of client assets must maintain those assets with a qualified custodian, deliver account statements to clients, and – in most cases – obtain a surprise examination by an independent public accountant. The critical word is "custody," which the rules define broadly to include direct possession, legal ownership, and the authority to obtain possession of client assets without client consent. A fund manager holding private keys, or holding assets through a sub-custodian that has not been independently vetted, may be treated as having custody even if no formal custodial agreement is in place.
The SEC has acknowledged that the current qualified-custodian definition creates friction for digital assets, because most state-chartered trust companies and national banks that would otherwise qualify as custodians are only beginning to build digital-asset infrastructure. The SEC's proposed rule amendments to the custody regime – and the ongoing enforcement posture under the existing rules – mean the standard is actively evolving. Fund managers structuring custody today must plan for a more stringent post-rulemaking environment, not only the present state of the rules.
The FinCEN layer also applies at the federal level. A fund manager that transmits value – including digital assets – on behalf of customers may be a money-services business (MSB) under the Bank Secrecy Act, triggering AML programme, suspicious activity reporting, and record-keeping obligations regardless of whether a state MTL is also required. The Travel Rule (the obligation to pass originator and beneficiary data with a transfer above the applicable threshold) applies to covered MSBs under FinCEN guidance. Compliance with the Travel Rule requires either a technology integration with a compliant VASP counterparty or an alternative data-passing mechanism that satisfies the rule's requirements.
For a scoped assessment of your fund's federal custody exposure, contact OBOLUS at info@oboluslaw.com. The process above describes the standard analytical path. Your facts – the entity structure, the investor base, the asset types, the banking arrangements – change the analysis in ways that are material to the outcome. Map your options.
State MTL and the NYDFS BitLicense: What Fund Managers Need to Know
State money-transmission licensing is the most operationally complex element of a US custody structure for a digital-asset fund. Forty-nine states and the District of Columbia require money-transmitters to obtain a state licence; the scope and the definition of "money transmission" as applied to digital assets differs materially across jurisdictions. The NYDFS BitLicense is the most prescriptive: it applies to any person engaged in virtual currency business activity involving New York or New York residents, regardless of where the business is physically located.
A fund manager that is a BitLicense holder – or that is required to be – must meet capital adequacy standards, maintain a cybersecurity programme that satisfies NYDFS Part 500, hold virtual currency belonging to New York residents in a manner that protects against loss, and submit to periodic examinations. The capital and reserve requirements are calibrated to the volume and type of virtual currency held, and they are not trivial for a fund with institutional-scale AUM.
Outside New York, the licensing landscape is fragmented. States such as Wyoming have created specific digital-asset banking charters that can function as a qualified custodian for certain purposes; others have exemptions for investment vehicles or for managers acting under SEC oversight. A multi-state analysis is essential before a fund manager accepts capital from US retail or institutional investors across different states. We regularly advise fund managers on the multi-state licensing stack and on the sequencing of applications to minimise the period during which the fund is exposed to unlicensed-activity risk.
One practical point worth emphasising: state regulators increasingly coordinate through the Conference of State Bank Supervisors (CSBS) and, for money-services businesses, the Multistate MSB Licensing Agreement Program. An application filed in one state can trigger licence-qualification inquiries in others. The sequencing of filings, and the completeness of the initial application, affects the timeline for the entire multi-state process.
How Is Custody Actually Structured for a Compliant Fund?
A compliant custody structure for a US-connected digital-asset fund typically involves three functional layers: the qualified custodian (holding registered securities or assets in custody as defined under the investment-adviser rules), the prime broker or execution venue (managing trading and settlement), and the sub-custodian or cold-storage provider (managing private-key infrastructure for assets that do not yet sit in a regulated custodian's system). The legal relationships between these layers – the custody agreement, the sub-custody agreement, and the prime brokerage agreement – must be structured to avoid inadvertent custody by the manager and to ensure clear legal ownership rights in an insolvency.
Self-custody by the fund manager is rarely advisable in a US context. It almost certainly triggers the investment-adviser custody rules, requires a surprise examination, and creates a direct enforcement risk if the manager is not otherwise a qualified custodian. The preferred structure routes assets through a third-party custodian that is either a state-chartered trust company with digital-asset capabilities, a nationally chartered bank with OCC approval to provide digital-asset custody services, or a foreign financial institution meeting the applicable SEC standard.
The choice of custodian also has banking implications. US-regulated custodians generally maintain their own banking relationships; a fund that routes assets through an offshore sub-custodian may find that domestic bank accounts for the fund entity are difficult to establish. We have seen this pattern repeatedly: a fund manager structures the custody layer carefully under SEC rules, then discovers that the banking layer – the correspondent bank for fund subscriptions and redemptions – will not onboard without a regulated domestic custodian reference. The custody decision and the banking decision must be made in parallel, not sequentially.
Cross-Border Interaction: Tax, Banking, and the Fund Domicile Question
A fund accepting US investors faces the US tax regime regardless of its domicile. A foreign (non-US) fund that is a passive foreign investment company (PFIC) for US federal tax purposes imposes punishing tax treatment on US individual investors unless it qualifies as a qualified electing fund (QEF) or the fund manager makes a mark-to-market election. These elections require the fund to produce US tax information in a specific format, which in turn requires the custodian to generate cost-basis and fair-market-value data on digital assets – a capability that not all custodians offer.
The Foreign Account Tax Compliance Act (FATCA) applies to foreign financial institutions – including many offshore fund structures – that have US-person investors. A foreign fund that fails to comply with FATCA reporting requirements faces withholding on US-source payments. For a digital-asset fund with US investors, FATCA compliance is not optional; it is a condition of maintaining access to US-sourced income and, indirectly, of maintaining the banking relationships through which redemptions are paid.
On the banking side, US correspondent banks remain cautious about digital-asset fund clients. The trend, however, is toward greater acceptance from banks that have built digital-asset compliance programmes, particularly where the fund's custodian is a regulated US entity and the fund manager has a strong AML and KYC programme. A fund manager entering the US market with an offshore domicile and a non-US custodian will typically face longer onboarding timelines and more intrusive due diligence than one with a domestic custodian and a Delaware-registered manager entity.
If a prior application stalled or a banking relationship did not proceed, a structural review can identify the reason and the path forward. Contact OBOLUS at info@oboluslaw.com. We regularly advise on both the custody and the banking layer simultaneously, because a solution that fixes one without addressing the other rarely holds. Map your options.
Decision Matrix: Which Custody Structure for Which Fund Profile?
Fund managers approach the US custody question from several different starting points, and the right structure depends on the profile of the vehicle, the investor base, and the asset mix.
Profile A – An offshore fund (Cayman or BVI) with US institutional investors (qualified purchasers). The fund manager is typically a registered investment adviser with the SEC or a relying adviser under a registered adviser's umbrella. Custody flows through a US-regulated trust company or a foreign financial institution meeting the SEC standard. The NYDFS BitLicense may apply if New York investors are included. The tax structure focuses on the PFIC/QEF election and FATCA reporting. Timeline for the custody arrangement to be fully in place depends on custodian onboarding, typically measured in weeks to months.
Profile B – A domestic Delaware LP or LLC with US accredited investors. The fund manager registers as an investment adviser (state or federal depending on AUM). The custody layer is built around a qualified custodian with a full-service digital-asset infrastructure. State MTL analysis covers the states in which investors reside. Banking onboarding proceeds in parallel with the custodian relationship. This profile tends to have the most straightforward custody path but the most complex multi-state licensing exposure.
Profile C – A foreign fund with no US investors but US-listed digital assets or US-based trading activity. The CFTC and FinCEN layers apply even without SEC registration. Segregation requirements for CFTC-regulated assets must be mapped; Travel Rule obligations apply to US-dollar-denominated transfers. The absence of US investors does not eliminate the US regulatory footprint where the assets or the activity have a US nexus.
In each profile, the custody structure is not an afterthought. It determines the fund's regulatory classification, its tax reporting obligations, its ability to bank, and its attractiveness to institutional investors who conduct their own custody due diligence.
A Recent Matter: Custody Restructuring for a Cross-Border Fund
Earlier this year, a multi-strategy digital-asset fund domiciled in a common-law offshore jurisdiction engaged us after a US institutional investor flagged that the fund's custody arrangement – a self-custody model with keys held by the manager – did not satisfy the investor's internal due diligence requirements under the applicable investment-adviser custody rules. We mapped the fund's asset classes against the SEC qualified-custodian standard, identified a US-regulated trust company with digital-asset infrastructure that could serve as primary custodian, and restructured the custody agreement to segregate assets by class and to eliminate the manager's ability to obtain possession of assets without investor consent. The fund was re-presented to the investor within a defined timeline; the institutional subscription closed in the subsequent quarter. The custody restructuring also resolved a pending concern from the fund's audit firm, which had flagged the prior arrangement as creating a qualification risk on the annual audit.
Self-Assessment: Are You Ready for US Custody Compliance?
Before committing to a custody structure for a US-connected digital-asset fund, consider the following questions honestly.
First: have you determined how each asset class in the fund is characterised under federal law – as a security, a commodity, or neither? The answer drives the entire custody obligation map.
Second: have you identified every state in which the fund will have investors, and assessed whether the fund manager's activity in those states constitutes money transmission as defined under local law? A single New York investor can bring NYDFS scrutiny without any other New York nexus.
Third: does your proposed custodian meet the SEC's qualified-custodian standard for the specific assets you intend to hold? A custodian that is qualified for bitcoin may not be qualified for tokenised securities or for staking positions in proof-of-stake protocols.
Fourth: have you aligned the custody arrangement with your banking strategy? The custodian relationship, the fund's bank account, and the investor subscription and redemption process must all be coherent. A gap in any of these – an offshore custodian with no US correspondent, or a fund account at a bank that will not accept digital-asset-related credits – will block the fund's ability to operate.
Fifth: have you planned for the FATCA and US tax reporting requirements that will flow from any US investor, regardless of domicile? The custodian must generate the data; the fund administrator must file the reports; and the fund's operating agreement must give the manager the authority to make the necessary elections.
A common assumption among fund managers structuring for the first time is that any offshore vehicle works equally well for a digital-asset fund with US exposure. It does not. The domicile of the fund affects its US tax classification, the availability of exemptions from SEC registration, and the ease with which a US-regulated custodian will agree to hold fund assets. Getting the domicile right at the outset prevents the kind of costly restructuring that often accompanies a failed institutional due-diligence process.
Related at OBOLUS
- Funds and Investment Vehicles for Digital-Asset Businesses – the full practice overview for crypto fund structuring, domicile and compliance
- Custody Arrangements for Early-Stage Founders – custody options and practical steps for funds at the pre-institutional stage
- Staking and Rewards Taxation in Malta – tax treatment of staking income for funds and managers in a MiCA-aligned EU jurisdiction
FAQ
Where should a crypto fund be domiciled?
Domicile selection turns on the investor base, the asset mix, and the tax profile of the expected LP population. A fund targeting US institutional investors often uses a Cayman or Delaware structure, but the choice affects the fund's US tax classification (including PFIC status), SEC registration requirements, and access to US-regulated custodians. The wrong domicile generates tax leakage and may restrict which investors the fund can legally accept. There is no single correct answer; the decision requires a fact-specific analysis of the fund's target economics and investor profile.
Does a digital-asset fund manager need a licence?
In most cases, yes – though the type of licence depends on the fund's strategy, AUM, and investor base. A manager advising a fund that holds digital assets characterised as securities by the SEC must register as an investment adviser at the federal or state level, unless a specific exemption applies. A manager whose activities constitute money transmission under state law must also hold state MTL licences in the relevant states. The CFTC layer applies separately where the fund trades commodity-characterised assets or derivatives. The licensing stack is rarely a single licence.
How is custody arranged for a crypto fund?
A compliant custody arrangement for a US-connected crypto fund routes assets through a qualified custodian that meets the SEC's investment-adviser custody rules – typically a state-chartered trust company, a nationally chartered bank with OCC approval for digital-asset custody, or a qualifying foreign financial institution. The manager should not hold private keys or maintain direct possession of fund assets. The custody agreement must segregate assets by investor, prevent the manager from obtaining assets without client consent, and support the audit requirements that flow from the custody rules. State MTL requirements may layer on top depending on the states in which the fund operates.
OBOLUS is an independent digital-asset law boutique acting only for businesses. We advise exchanges, custodians, token issuers and funds on licensing across 70+ jurisdictions, on disputes and on-chain asset recovery across 25+ forums, and on the tax, banking and compliance that sit around them. We match domicile to investor base, asset mix and redemption profile – and our disputes team coordinates freezing relief and on-chain tracing across leading common-law forums when fund assets are at risk. Digital assets are the whole of our practice. To discuss your situation, contact info@oboluslaw.com.
By Lydia Brennan, Tax & Structuring Analyst – specialising in cross-border fund structuring, US tax obligations for digital-asset vehicles, and the interaction of custody arrangements with FATCA and state licensing regimes.
This publication is general information about the law and does not constitute legal advice. It is not a substitute for advice tailored to your circumstances. OBOLUS accepts no liability for action taken or not taken on the basis of this material. For advice on your situation, contact info@oboluslaw.com.