Coinbase’s dominant role in safeguarding U.S. spot crypto ETF reserves is drawing renewed scrutiny after the company said it custodies assets for 10 of 11 spot bitcoin ETFs and 8 of 9 spot ether ETFs. The disclosure came just ahead of the launch of spot ether ETFs on Wall Street, reigniting a broader debate over whether the rapid institutionalization of digital assets is creating a new form of concentration risk.
As spot ether ETFs began trading, early market data showed roughly $300 million in volume during the first hour. Against that backdrop, Coinbase highlighted its position as the primary custody provider for most U.S. spot BTC and ETH ETF issuers. The company framed its role as evidence of trust in its infrastructure, pointing to a 12-year track record of managing digital assets at institutional scale and to the development of what it described as a leading custody platform.
A custody concentration issue comes into focus
The central concern is not whether Coinbase is a credible custodian in isolation, but whether so much of the U.S. crypto ETF market should rely on a single provider. That question was raised publicly by Gabor Gurbacs, founder of Pointsville and former strategy advisor at VanEck, who argued that boards and risk committees at fund issuers should reconsider whether this level of exposure to one entity is prudent.
Gurbacs said he was not attacking Coinbase’s security practices or operational capabilities. Instead, he focused on what market participants often call counterparty or single-entity risk. If one firm sits at the center of reserve storage for nearly the entire U.S. spot bitcoin and ether ETF ecosystem, any operational disruption, legal complication, security incident, or service outage could have consequences far beyond one product or issuer.
That framing resonated with many observers, especially those who have long argued that crypto’s promise of resilience can be undermined when infrastructure becomes too centralized. Several reactions on social media echoed the view that Wall Street, even when adopting crypto products, still tends to consolidate core functions into a small number of familiar institutions and service providers.
Why the criticism is broader than Coinbase
The debate matters because ETF custody is not just a back-office technicality. Custodians play a foundational role in the structure of exchange-traded products by holding the underlying assets, supporting operational integrity, and helping assure investors that reserves are properly secured. In traditional finance, concentration in custody or clearing can become a systemic concern when too much market exposure is routed through too few firms. The same logic now appears to be surfacing in digital asset ETFs.
Gurbacs explicitly noted that his concern should not be interpreted as anti-Coinbase. He said he had previously referred major clients to the company and appreciated the work it had done for the industry. His objection, in essence, was that even a well-regarded and capable firm should not become the sole or near-sole counterparty for an entire segment of the market.
This distinction is important. The issue is not necessarily a lack of confidence in one custodian’s current controls. Rather, it is a question of market design: should issuers, regulators, and institutional investors accept a structure in which most ETF reserve assets are concentrated in one place simply because that arrangement is efficient, familiar, or convenient?
The exception highlights the concentration
One of the few notable exceptions mentioned in the discussion is Fidelity, which does not rely on Coinbase for the custody of its bitcoin or ether ETF assets and instead operates its own institutional-grade custody service. That alternative model underscores the fact that Coinbase’s dominance is not inevitable, even if it is currently the preferred solution for most issuers.
The presence of at least one large self-custody-capable institution suggests that diversification is possible, though not necessarily easy. Building and maintaining institutional-grade custody infrastructure requires capital, expertise, regulatory readiness, and operational depth. For many ETF sponsors, partnering with an established provider may be the simplest path to market. But convenience does not eliminate risk, especially when repeated across nearly the entire sector.
A broader lesson for the crypto ETF era
The controversy arrives at a pivotal moment for crypto markets. Spot bitcoin ETFs opened the door for broader mainstream investment access, and spot ether ETFs represent another step in integrating digital assets into traditional capital markets. Yet as the sector matures, old questions about decentralization, dependency, and systemic fragility are reappearing in institutional form.
In crypto-native circles, concentration risk has long been discussed in relation to exchanges, stablecoins, infrastructure providers, and validators. The ETF market now adds custodians to that list. If the same firm is trusted by almost every major issuer, then the success of the products may also create an invisible point of failure. That does not mean such a failure is likely, but it does mean the consequences could be amplified if one ever occurred.
For issuers and their boards, the discussion may lead to a reassessment of how custody risk should be measured. Questions could include whether multiple custodians should be used more widely, whether reserve storage should be geographically or operationally diversified, and whether concentration thresholds should become part of internal risk frameworks. For regulators and market observers, the issue may help define the next phase of oversight as crypto ETFs become more established.
Ultimately, Coinbase’s commanding position in U.S. spot ETF custody can be read in two ways. On one hand, it reflects the company’s success in building trusted institutional infrastructure at a time when few competitors were equally prepared. On the other, it highlights how quickly a market built on distributed technology can converge around a single gatekeeper. As spot BTC and ETH ETFs continue to grow, that tension between trust, efficiency, and diversification is likely to remain at the center of the conversation.