In the aftermath of the $6.3 billion hack of Binance, industry leaders are scrutinizing the next potential targets for state-sponsored cyberattacks. Yishi Wang, founder and CEO of the Hong Kong-based hardware wallet company OneKey, has identified BlackRock’s iShares Bitcoin Trust (IBIT) as a prime candidate for the next major breach. Wang argues that the sheer scale of the fund, which holds approximately 815,000 BTC valued at nearly $63 billion, makes it an attractive objective for North Korean threat actors seeking high-value assets.

BTC / USD
Source: CoinGecko. Prices are indicative.

Single Custodian Risk

A central concern raised by Wang is the structural dependency of IBIT on Coinbase as its exclusive custodian. This arrangement creates what he describes as an extraordinary concentration of risk in a single entity. Wang noted that regardless of Coinbase's financial resources, a critical failure in its security infrastructure could jeopardize the entire fund. He emphasized that the larger these asset pools become, the more appealing they are to attackers, and that a compromise at any critical node could have consequences extending far beyond a single institution.

Limitations of Insurance and Freezing

Wang highlighted a crucial difference between Bitcoin and stablecoins: unlike stablecoins, stolen BTC cannot be blocked or frozen by centralized issuers. This reality was contrasted with the immediate response to the Binance hack, where Circle and Tether collectively froze over $2.3 billion in swiped stablecoins to mitigate losses. For IBIT, such a mechanism is unavailable. Furthermore, while Coinbase has disclosed $320 million in criminal insurance coverage, Wang pointed out that this coverage is shared across all customers. Custody agreements reportedly limit liabilities to $100 million per cold storage address, meaning that in the event of a major attack, IBIT holders would likely bear the brunt of the financial loss.

Potential Financial Impact

If IBIT were to suffer an attack similar to the one that struck Binance, the financial implications would be severe. Wang estimated that such an incident could wipe out 9.5% of the fund’s assets. At current valuations, this would result in losses that could be socialized at approximately $4 per share. This scenario underscores the vulnerability of ETF holders who rely on third-party custody for their digital asset exposure, despite the convenience such products offer to institutions and individuals.

What to Watch Next

As the crypto industry continues to recover from the Binance breach, attention will likely shift toward the security postures of major ETF providers and their custodians. Investors and regulators may scrutinize the concentration risks associated with single-custodian models. Wang concluded his warning by urging vigilance, stating that there are no silver bullets in security and that a clean track record does not guarantee future safety, a sentiment he encapsulated with the term "bunker mode."