Custody Concentration Risk Emerges as Major Hurdle for Bitcoin Spot ETFs, Experts Warn

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Custody Concentration Risk Emerges as Major Hurdle for Bitcoin Spot ETFs, Experts Warn

Miami — The rapid growth of Bitcoin spot exchange-traded funds has opened the door for mainstream investors to gain exposure to cryptocurrency without directly holding digital assets. But according to industry experts speaking at the Consensus 2025 conference in Miami, unresolved structural issues — particularly around custody concentration — could limit broader adoption and introduce systemic risks.

Advisor Hesitation Remains a Barrier

Christopher Russell, Head of Strategy and Analytics at Calamos Investments, told attendees that despite the hype surrounding Bitcoin spot ETFs, their share of the total advisory market remains negligible. With the U.S. advisory industry managing approximately $146 trillion in assets, the current allocation to Bitcoin ETFs is still minimal.

Russell explained that financial advisors are reluctant to recommend significant allocations to Bitcoin due to its notorious price volatility. The burden of explaining sudden double-digit percentage drops to clients, he said, creates a communication challenge that many advisors prefer to avoid entirely. This hesitation suggests that while ETFs have simplified access, they have not solved the fundamental trust and volatility issues that keep institutional capital on the sidelines.

Custody Concentration: A Growing Systemic Risk

A more technical but equally pressing concern was raised by Jean-Marie Mognetti, co-founder and CEO of CoinShares. Mognetti warned that the vast majority of Bitcoin spot ETFs rely on a single custodian — Coinbase — to hold their underlying Bitcoin reserves. This concentration creates a single point of failure that, if compromised, could trigger a cascading crisis across the entire ETF ecosystem.

“The custody structure is fragile,” Mognetti said during a panel discussion. “We are seeing a huge concentration risk emerge because nearly every issuer chose the same custodian. That is not a diversified system.”

His comments echo earlier warnings from regulatory observers who have questioned whether the ETF structure adequately addresses the unique operational risks of digital assets. Unlike traditional ETFs, where multiple custodians and clearinghouses provide redundancy, the Bitcoin ETF market has coalesced around a single provider.

Why This Matters for Investors

For retail and institutional investors alike, the custody concentration issue introduces a layer of counterparty risk that is often overlooked in ETF marketing materials. If Coinbase were to experience a security breach, insolvency, or regulatory shutdown, the underlying Bitcoin held for multiple ETFs could be frozen or lost simultaneously. This risk is compounded by the fact that many investors choose ETFs specifically to avoid the security responsibilities of self-custody.

The situation mirrors earlier concerns in the crypto lending space, where concentration of assets with a few platforms led to cascading failures during the 2022 market downturn. While Coinbase is a publicly traded company with stronger compliance infrastructure than many of its predecessors, the single-custodian model remains a vulnerability that the industry has yet to address.

Industry Responses and Potential Solutions

Some ETF issuers have begun exploring multi-custodian arrangements, but progress has been slow. The operational complexity of splitting Bitcoin reserves across multiple custodians, each with different security protocols and insurance coverage, has deterred rapid adoption. Meanwhile, regulators including the Securities and Exchange Commission have not mandated diversification of custody, leaving the decision to individual fund managers.

Mognetti suggested that the industry may need to develop standardized multi-custodian frameworks, similar to those used in traditional finance for asset-backed securities. Until then, he warned, the concentration risk will remain a hidden liability for ETF investors.

Conclusion

Bitcoin spot ETFs have undoubtedly lowered the barrier to entry for cryptocurrency investing, but the industry is still grappling with structural challenges that could undermine their long-term stability. Advisor reluctance driven by volatility and the concentration of custody with a single provider are two issues that require urgent attention. For investors, understanding these risks is essential before committing capital to what remains a maturing but still fragile market.

FAQs

Q1: Why is custody concentration a risk for Bitcoin spot ETFs?
Most Bitcoin spot ETFs rely on Coinbase as their sole custodian. If Coinbase experiences a security breach, insolvency, or regulatory action, the Bitcoin reserves for multiple ETFs could be compromised simultaneously, creating a systemic risk.

Q2: Are financial advisors recommending Bitcoin ETFs to clients?
Generally, no. According to Calamos Investments’ Christopher Russell, advisors are hesitant due to Bitcoin’s extreme price volatility and the difficulty of explaining sharp losses to clients. The total allocation to Bitcoin ETFs remains tiny relative to the $146 trillion advisory market.

Q3: What solutions are being considered for the custody problem?
Some issuers are exploring multi-custodian arrangements to diversify risk, but progress is slow due to operational complexity. Industry leaders like CoinShares have called for standardized multi-custodian frameworks similar to those used in traditional finance.

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