ETF Custody Raises Concerns About Concentrated Risk in Crypto Market

When markets are closed and Bitcoin is moving, the custody agreement decides who can act.

A spot Bitcoin ETF fixed an awkward problem for finance. Bitcoin used to arrive as software, keys, and operational responsibility. The ETF repackaged it as a ticker that sits next to every other ticker.

That convenience came with a structural trade. Most ETF buyers get exposure while someone else holds authority. Gannett Trust frames that as a deliberate choice between convenience and control, rooted in something Bitcoin makes explicit.

Ownership sits in keys and authorization, not in a statement that says you have economic exposure. Traditional markets blur those layers. Bitcoin doesn’t, which is why the paperwork can look familiar while authority sits elsewhere.

That separation used to feel philosophical. It turned operational once Bitcoin moved from trading into treasuries and long-horizon portfolios, where the risks include governance, key-person dependency, operational breakdowns, and continuity planning. So when something breaks, who holds authority?

The ETF creates exposure, while custody creates power

When you buy a spot Bitcoin ETF, you buy shares in a trust, and the trust holds Bitcoin through a custodian.

With stocks and bonds, the operational layer feels abstract because the legal and technical systems evolved together. With Bitcoin, the technical system is the ownership system, with keys authorizing movement and authorization creating control.

SEC filings spell the structure out. One spot Bitcoin trust prospectus states “each Share represents a fractional undivided beneficial interest in the net assets of the Trust,” while “the assets of the Trust consist primarily of bitcoin held by the Bitcoin Custodian on behalf of the Trust.” That sentence carries the whole trap. Shareholders own shares, the trust owns bitcoin, and the custodian holds it.

A newer SEC filing for another bitcoin trust uses the same basic architecture, again describing bitcoin held by the custodian on behalf of the trust and shares as beneficial interests in the trust’s net assets. The wording varies by issuer, but the structure stays consistent.

That’s where power concentrates. “On behalf of the trust” is a custody relationship, and custody concentrates operational authority. It also concentrates points of failure, because access control, signing policy, operational resilience, business continuity, and legal process sit inside that relationship. Retail shareholders can’t redeem shares for bitcoin the way a native holder can move bitcoin at will.

Bitcoin’s balance-sheet era turns keys into governance

Gannett Trust’s report helps explain why this is a hot issue right now. Bitcoin is moving from speculative positioning toward strategic ownership, with durability, control, and administrative rigor joining liquidity as core considerations.

In that framing, due diligence changes shape. Instead of focusing on execution alone, the questions move toward governance. Who has authority, how’s it exercised, and how does it persist over time? The report calls out the risk categories that grow in importance when assets move from trading accounts onto balance sheets: governance failures, unclear decision rights, operational breakdowns, and continuity planning.

That list will feel familiar to anyone with tradfi experience. Bitcoin adds a twist because the authority layer is technical. If an organization loses the ability to authorize movement, it loses control in a literal sense.

ETFs look like a way around that. For many investors, the ETF outsources the custody problem into a regulated wrapper. The custody contract becomes the governance contract. The sponsor, trustee, custodian, prime execution agent, and authorized participants become part of the control surface even though the buyer thinks they purchased a simple Bitcoin position.

Gannett Trust describes the trade as a choice between convenience and control. Derivative exposure offers simplicity and operational familiarity. Native ownership offers control and sovereignty, and it requires purpose-built governance and administration.

As Bitcoin becomes embedded within long-term structures, the enduring question becomes who holds authority, how it’s exercised, and how it endures over time.

That’s a custody question disguised as a portfolio question.

The scale tells you where the default is headed

The structural argument wouldn’t matter much if ETFs stayed small. With over $54 billion sitting in spot Bitcoin ETFs as of Feb. 25, it’s become core market plumbing. There’s about 1.47 million BTC in spot Bitcoin ETFs and another 3.27 million BTC sitting on exchanges.

Those numbers do two things at once. They show a new holder class becoming large enough to shape liquidity and market microstructure, and they show paper rails becoming the dominant on-ramp. When millions of coins sit inside institutional wrappers, new entrants first see Bitcoin as an instrument rather than an asset in a wallet.

That matters because learning shapes behavior. A buyer who learns Bitcoin through ETFs learns it as a market-hours asset, a brokerage asset, a compliance asset, and a statement asset. A buyer who learns Bitcoin through native custody learns it as a bearer asset with continuous settlement. Both groups can be long Bitcoin, but they occupy different power geometries.

The ETF share class can grow while the number of people who control keys stays flat. Over time, it starts to resemble a class system: exposure holders and owners.

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Gannett’s report treats the divide as structural rather than semantic, rooted in Bitcoin’s design. Once you accept that, the next question becomes practical. What can go wrong inside the intermediary stack, and what happens to the buyer in each case?

The plumbing risk: concentration and the trading window

Start with custody concentration. The spot Bitcoin ETF market quickly converged on a pattern: a handful of major products, a handful of custodial arrangements, and one crypto-native custodian showing up again and again. Coinbase was the custodian in eight of the 11 spot Bitcoin ETF listings at launch.

Concentration can bring efficiencies through standard processes, scale economics, consistent controls, and simpler interfaces for asset managers. It also creates a single cluster where operational resilience and governance become system-level concerns.

Then there’s the trading window. Spot bitcoin ETF investors are bound by market hours for trading, while bitcoin trades continuously across venues and jurisdictions. If Bitcoin gaps on a Saturday, the ETF position can’t follow until the bell. The people who can move the underlying asset sit inside the custody stack, and everyone else sits in the share market waiting for it to reopen.

That difference forces an uncomfortable but clarifying question. Which market do you actually own exposure to if you own ETFs, the continuous Bitcoin market, or the listed share market that references Bitcoin?

When something breaks, authority looks different depending on the lane

A useful way to think about the two lanes is to focus on authority paths, meaning the routes through which decisions and actions occur when conditions change fast.

In native ownership, the authority path runs through the keys. Who can sign, under what conditions, with what approvals, who can rotate keys, where backups are kept, and how continuity works across life events and organizational transitions. Those details are the governance layer.

In the ETF lane, the authority path runs through institutional roles: sponsor, trustee, custodian, authorized participants, listing venue, and broker. The investor’s decisions are mostly financial: buy, sell, size, rebalance. They gain simplicity, and they accept that authority lives in a stack of contracts and counterparties.

People assume ETF convenience is a user interface upgrade. In reality, it’s a reallocation of operational agency. It can feel like a neat feature, and it can become a fragility layer once ETF holdings grow large enough that custody and operational practices become system-relevant.

A spot Bitcoin trade can tolerate some messiness. A balance-sheet asset needs durable governance. The ETF buyer delegates governance to institutions. The native holder builds it into key policy and procedures. Neither lane is inherently better. The risk lies in misunderstanding the lane you chose.

The new Bitcoin class system: exposure holders and owners

Spot Bitcoin ETFs succeeded because they made Bitcoin legible to the largest capital pools in the world. They turned keys into a fee line item and custody into a service relationship, offering a version of Bitcoin that fits inside the ordinary wealth stack.

The resulting divide is one of the most consequential structural features of Bitcoin’s institutional era. Exposure and ownership separate cleanly, and allocators face a choice between convenience and control. Bitcoin is one of the few assets where ownership is a technical reality, which forces the authority question into the open.

The scale makes the direction clear. Around $54 billion worth of BTC sits in ETFs, showing a market that prefers paper rails even when the underlying asset was built around bearer control. The market can live with that, and the buyer can live with that. The failure mode comes from calling it ownership when it’s delegated authority.

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