More than 80% of Bitcoin ETF assets are held in Coinbase custody, putting $74 billion at risk.

Is Coinbase too big to fail? It has to be now ETFs rely on it daily

For two years, Wall Street has been convincing investors of a clear vision for Bitcoin: a regulated exchange-traded fund, processed and settled through the same institutional framework that manages equities and bonds, free from the chaotic history that plagued earlier phases of crypto.

This approach has proven remarkably effective, attracting tens of billions of dollars into an asset class structure that felt familiar to both advisors and compliance teams.

However, the industry rarely discusses the extent to which this entire system is funneled through a single entity.

Morgan Stanley introduced the Morgan Stanley Bitcoin Trust (NYSE Arca: MSBT) on April 8, becoming the first US bank-affiliated asset manager to provide a cryptocurrency ETP. The fund launched with approximately $34 million in trading volume on its first day, featuring a 14-basis-point fee that undercuts BlackRock’s leading iShares Bitcoin Trust by 11 basis points, with Coinbase and BNY serving as its custody providers.

The competitive aspect is clear, but the structural implications are even more telling: yet another prominent institution integrating into the same custody framework that already supports the vast majority of the US bitcoin ETF market.

As of April 8, the US bitcoin ETF sector tracked by Bitbo held $91.71 billion in total assets under management (AUM). Funds that designate Coinbase as custodian or primary custodian represent about $77.10 billion of that total, or 84.1 percent of the entire market.

This upper-limit figure includes the largest and most liquid entities in the sector: BlackRock’s IBIT at $55.70 billion, Grayscale’s ETFs at $14.67 billion, Bitwise’s BITB at $2.67 billion, ARK’s ARKB at $2.59 billion, along with several smaller funds such as BRRR, EZBC, BTCO, and BTCW.

A more stringent methodology that excludes funds with multiple custodians or undisclosed allocation splits still results in approximately $74.06 billion, or 80.8 percent. In any case, the concentration is remarkable.

The caveats warrant careful consideration, as the distinction between a significant choke point and an outright monopoly separates a serious structural issue from a misleading headline.
BlackRock’s IBIT prospectus identifies Coinbase as its Bitcoin custodian but also mentions Anchorage as an additional custodian, indicating that there are no current plans to transfer assets there. ARK 21Shares’ ARKB filings list Coinbase alongside BitGo and Anchorage. CoinShares Valkyrie’s BRRR names Coinbase, BitGo, and Komainu but does not disclose the allocation among them. Fidelity self-custodies through its own digital asset subsidiary, while VanEck utilizes Gemini.

The market does have its exceptions, which are noteworthy, but the overall weight of the complex still heavily favors one provider.

How the path of least resistance became the only path

Numerous issuers, each with access to advanced legal and operational teams, continue to gravitate toward the same vendor for a growing set of structural reasons.

Coinbase is a regulated qualified custodian under New York trust regulations, providing a compliance profile that meets the requirements of the most cautious institutional gatekeepers. It already possessed the operational infrastructure that ETF issuers required when the SEC approved spot bitcoin ETFs in January 2024, making it the most straightforward choice during a tight launch timeline when several issuers were competing to enter the market within days of each other.

This first-mover advantage in ETF custody then became self-reinforcing: once the largest issuers opted for Coinbase, the authorized participants, market makers, legal advisors, and boards assessing subsequent launches became comfortable repeating the same model rather than introducing a new variable into an innovative product structure.

Coinbase’s conditional approval from the Office of the Comptroller of the Currency for a national trust charter, announced on April 2, will solidify its position in the market.

A finalized charter would enable the firm to function as a federally regulated digital asset custodian under a single OCC supervisor, replacing the fragmented state licenses that currently govern its operations.

Greg Tusar, Vice President of Institutional Product at Coinbase, mentioned that the company already custodies over 80% of the world’s crypto ETFs. The OCC approval, if finalized, would establish Coinbase as the default crypto back-office infrastructure for institutions that require federal-grade regulatory assurance before allocating capital, further widening the gap between it and any competitors still working on state-by-state licenses.

Whether this concentration indicates genuine market choice or reflects a limited-capacity market where alternatives were too scarce, too new, or too politically complex during the crucial ETF launch period is a question the industry has yet to address candidly.

A few issuers have started to disclose backup custodians, suggesting at least some recognition of the issue, even if those disclosures have not yet led to a significant redistribution of actual BTC holdings.

$77 billion of correlated vulnerability in Coinbase

ETF structures are designed to ensure that fund assets are separated from the sponsor’s balance sheet, and custody agreements impose fiduciary responsibilities and segregation requirements.

Morgan Stanley’s own filing outlines segregation protocols and insurance coverage for custodied assets. These protections are crucial and ensure that concentration risk in this market appears very different from the commingling disasters that characterized the crypto collapses we are all too familiar with.

The risk here is subtler and, in some respects, more challenging to address, as it runs through the operational layer.

If the leading custodian experiences a technology failure, a settlement bottleneck, or a regulatory shock, the repercussions can extend across multiple ETF issuers simultaneously, impacting creation and redemption processes for funds that collectively hold the vast majority of the market’s assets. ETF disclosure documents consistently emphasize the significance of the custodian to fund operations and the potential consequences if a custodian resigns or can no longer fulfill its role.

A single enforcement action or licensing dispute at Coinbase could easily escalate into a market-wide incident due to the shared dependency among so many funds. The impact of any disruption scales with the assets Coinbase manages, which now exceed $74 billion even under the most conservative estimates.

There is also a confidence aspect to consider. The institutional credibility narrative that the ETF industry has constructed around Bitcoin relies on these products functioning as seamlessly and predictably as any other listed fund. A custody disruption at the firm that supports more than four-fifths of the market would challenge that promise in ways that could take years to mend, regardless of whether investor assets were ultimately restored.

Fidelity’s choice to self-custody, VanEck’s use of Gemini, and BlackRock’s acknowledgment of Anchorage as an available alternative all indicate that the means for diversification are present.

However, will the industry take advantage of them before a crisis compels action?

The post Over 80% of Bitcoin ETF assets hit Coinbase custody choke point with $74B at risk appeared first on CryptoSlate.