Institutional Cryptocurrency Banking: Custody, Compliance, and the Right Stack

The collapse of FTX in November 2022, the insolvency of Celsius and Voyager in the same year, and the earlier exchange hacks that destroyed billions in customer assets have made one point impossible to ignore: holding cryptocurrency on a consumer exchange is not banking. It is unsecured lending to a largely unregulated company.

For individuals or institutions holding cryptocurrency at a level where it constitutes a meaningful portion of wealth — typically above £100,000 in digital assets — a deliberate, institutional-grade approach to custody, trading, and banking is not optional. This guide addresses what that looks like in practice.

The Institutional Crypto Stack

A complete institutional cryptocurrency arrangement comprises four layers:

1. Custody: where your cryptocurrency is actually stored. Custody is the management of private keys — the cryptographic credentials that control access to digital assets. If the custodian fails or is hacked and your assets are on a hot wallet (connected to the internet), they can be stolen with no recourse.

2. Trading: access to liquidity when you want to buy or sell cryptocurrency. Custody and trading are often provided by the same entity but need not be.

3. Banking: converting between cryptocurrency and fiat currency (GBP, USD, EUR). This requires a banking relationship that accepts cryptocurrency business.

4. Accounting and tax: tracking the cost basis of all acquisitions and disposals for tax reporting. The complexity of this grows non-linearly with the number of transactions.

Regulated Custodians

Institutional-grade cryptocurrency custody uses "cold storage" — private keys stored on hardware that is physically disconnected from the internet and typically held in secure vaults. The following are the main regulated custodians accessible to UK and European HNW clients:

Coinbase Custody / Coinbase Prime: the institutional arm of Coinbase. Regulated in multiple jurisdictions including the UK (FCA registered). Segregated cold storage. Coinbase Prime provides an institutional trading platform alongside custody. Appropriate for clients needing both custody and exchange access in one relationship.

BitGo: one of the oldest institutional custodians. Multi-signature security model. Regulated in several US states and in Germany. Provides insurance on custodied assets.

Fireblocks: primarily a custody infrastructure provider used by financial institutions to build crypto services. Less accessible to individual HNW clients but important in the institutional ecosystem.

Fidelity Digital Assets: the institutional crypto arm of Fidelity, the US asset management giant. Bitcoin and Ethereum custody. Primarily serves institutional investors.

Anchorage Digital: US federal bank charter (OCC); the only federally chartered digital asset bank in the US. Services institutional investors and businesses.

ETC Group / HANetf products: for clients who want regulated exposure to cryptocurrency without direct custody, exchange-traded products (ETPs) on the London Stock Exchange provide Bitcoin and Ethereum exposure through a regulated securities structure. The underlying assets are custodied by regulated custodians.

The UK Bank Attitude Towards Cryptocurrency

UK high-street banks have historically been restrictive about cryptocurrency transactions. The commercial logic is compliance risk: cryptocurrency transactions are associated with money laundering in regulatory guidance, and banks face scrutiny for facilitating them.

The practical restrictions imposed by various UK banks at various times have included:

• Blocking outbound transfers to known cryptocurrency exchange accounts
• Imposing limits on transfers to cryptocurrency businesses
• Sending alerts when customers buy cryptocurrency
• Closing accounts of customers identified as high-volume cryptocurrency traders

This is changing. Following FCA guidance in 2023 encouraging banks to take a proportionate, risk-based approach (rather than blanket blocking), and the growth of regulated crypto activity, major UK banks have generally become more permissive. The trend is towards allowing transactions to FCA-registered exchanges (Coinbase, Gemini, Kraken) while applying additional scrutiny to unregistered entities.

The current position as of 2026 varies by bank. HSBC, Barclays, and NatWest are the most accommodating of routine exchanges with regulated entities. Monzo and Starling have been variable. Revolut (itself a crypto product provider) is naturally accommodating.

The AMINA (formerly SEBA) and Sygnum Option

For HNW clients who want integrated crypto and fiat banking in a single regulated institution, two Swiss banks offer this proposition:

AMINA Bank (Switzerland; formerly SEBA Bank, rebranded in 2024): a FINMA-regulated bank that provides conventional banking services alongside crypto custody, trading, and institutional services. Clients can hold CHF, EUR, USD, and GBP alongside BTC, ETH, and other cryptocurrencies in a single relationship. It issues a Mastercard debit card linked to both crypto and fiat balances. Based in Zug (Switzerland's "Crypto Valley").

Sygnum Bank (Switzerland): also FINMA-regulated; similar proposition to AMINA. Provides tokenisation services, crypto custody, regulated exchange, and conventional banking. Initially focused on institutional clients; has expanded to qualifying HNW private clients.

Both banks are accessible to UK non-residents meeting their onboarding requirements (minimum assets typically CHF 500,000 or equivalent; extensive KYC/AML documentation). For UK residents, Swiss accounts are CRS-reported to HMRC — no tax concealment is available.

For clients who are genuinely internationally mobile or non-UK resident, AMINA or Sygnum provides the most comprehensive crypto-fiat integration available in a regulated banking framework.

The Regulatory Environment

United Kingdom: the FCA requires registration (not full authorisation, at present) for businesses carrying on certain crypto asset activities. The FCA registered list is the key filter — using registered firms materially reduces regulatory and counterparty risk. The UK government announced in 2024 a more comprehensive regulatory framework for crypto assets; the detailed rules are being implemented. HMRC treats cryptocurrency as a capital asset for tax purposes — not currency.

European Union: MiCA (Markets in Crypto-Assets Regulation) took effect from December 2024. It provides a comprehensive pan-EU licensing framework for crypto asset service providers, covering exchanges, custodians, and stablecoin issuers. UK-based clients using EU-regulated providers benefit from this framework.

United States: the most complex regulatory environment — SEC, CFTC, and FinCEN all have overlapping jurisdiction. Relevant for UK clients using US custodians.

Tax Record-Keeping Requirements

HMRC treats cryptocurrency disposals as capital gains tax (CGT) events. Each time you sell, exchange, or use cryptocurrency to buy goods or services, you have a disposal for CGT purposes. UK CGT rules apply to:

• Selling crypto for fiat
• Exchanging one cryptocurrency for another
• Using crypto to pay for goods or services
• Gifting crypto (other than to a spouse or civil partner)
• Airdrops and forks may also trigger income or CGT events

The applicable accounting method in the UK is the pooled cost method (Section 104 pool) with a same-day rule and a 30-day rule preventing "bed and breakfasting" (selling and immediately repurchasing).

For active traders or those holding diverse portfolios, calculating the correct cost base for each disposal is complex and error-prone if done manually. Specialist cryptocurrency tax software is strongly recommended:

• Koinly: connects to most major exchanges and wallets via API; calculates UK CGT; exports to HMRC formats
• CryptoTaxCalculator: similar functionality; supports Section 104 pool calculation
• Cointracker: widely used; good exchange connectivity
• TaxScouts: UK-focused accountancy service that handles crypto tax

These tools import transaction data from exchanges and wallets, calculate gains and losses automatically, and produce reports suitable for self-assessment tax returns. They cost £50–£200 per year for typical users and are significantly cheaper than the accountancy time that manual calculation requires.

Institutional Insurance

Standard bank deposit insurance does not cover cryptocurrency holdings. Specialist institutional insurance for crypto assets is available from Lloyd's of London syndicates and specialist insurers. Major custodians carry their own insurance (BitGo, Coinbase Custody); ask for details of coverage limits and exclusions before entrusting assets.

For clients holding significant crypto assets, understanding the insurance position — who covers what, against which risks (hack, theft, insolvency, but typically not market loss) — is part of the diligence process.

The information in this guide is for educational purposes only and reflects conditions as of mid-2026. Cryptocurrency regulations, banking policies, and tax treatment change rapidly. This does not constitute financial, tax, or investment advice. Cryptocurrency values can fall as well as rise, potentially to zero. Seek professional advice tailored to your specific circumstances.

How Global Investments Can Help

Global Investments works with HNW clients managing diverse asset portfolios, including those with significant digital asset holdings. We can advise on the intersection of crypto assets with conventional financial planning — how digital asset holdings interact with estate planning, overseas property acquisition, residency-by-investment programmes, and tax structuring. We also assist with introductions to regulated custodians and specialists in crypto tax compliance.