Coinbase holds custody for nearly all US spot crypto ETFs, creating single point of failure

Coinbase controls the vault for 9 of 11 spot Bitcoin ETFs and 8 of 9 Ethereum ETFs in the US market. That's roughly 80-84% of all Bitcoin ETF assets, or about $74 billion out of $91.7 billion in total AUM. Bitwise flagged this concentration as a defining feature of today's ETF landscape, and the numbers don't lie.

When the SEC approved spot Bitcoin ETFs in January 2024, issuers needed a custodian with regulatory relationships, insurance, and proven cold storage infrastructure. Coinbase had all three. Over 12 years of holding institutional crypto assets meant the exchange was the obvious choice. BlackRock's IBIT, the largest spot Bitcoin ETF, routes deposits through Coinbase Prime. So does nearly every other major issuer.

Why diversification doesn't actually work here

Not everyone uses only Coinbase. Fidelity built its own crypto infrastructure starting in 2018, so FBTC uses Fidelity Digital Assets as custodian. VanEck's HODL split custody between Gemini and Coinbase. BlackRock added Anchorage Digital to the mix alongside Coinbase. Yet the vast majority of ETF assets still flow through a single provider.

This creates a hidden risk. If Coinbase experienced a major operational failure, it wouldn't affect just one ETF. Nine Bitcoin ETFs would go down simultaneously. Buying multiple Bitcoin ETFs from different issuers sounds like diversification until you realize they're all held by the same custodian. The competitive landscape for crypto custody is expanding slowly. Anchorage Digital now holds a federal bank charter. Fidelity Digital Assets has backing from one of the world's largest financial services firms. But winning ETF custody mandates requires years of regulatory work and trust that most competitors haven't built yet.

Bitcoin ETF inflows have cooled in recent weeks, and the custody concentration hasn't become a market issue. For now.

This article is informational only and does not constitute financial or investment advice. Custody concentration involves risks that investors should understand before allocating capital to any single ETF.