That is one founder's opinion, not a known threat. Yishi Wang, founder of hardware wallet maker OneKey, posted on Friday: "I suspect IBIT is already on North Korea's shortlist," 99Bitcoins reported. His reasoning is concentration. BlackRock's iShares Bitcoin Trust holds about 815,000 BTC, roughly $63.7 billion at Monday's price, with a single custodian, and Wang estimated a theft the size of Binance's would equal about 9.5% of the fund, or around $4 a share. He also noted that BlackRock does not separately insure the coins. No authority has named IBIT or its custodian as a target, and Wang sells self-custody devices, so the warning comes from someone with a product in the debate. The question lands in the same week the FBI blamed North Korea's TraderTraitor unit for the $6.3 billion Binance theft, and with spot bitcoin funds coming off a $643 million day of redemptions. For holders weighing the choice, it is the old trade between owning shares that a custodian protects and holding coins yourself with your own keys.