Bitcoin ETF Inflows Hit $850M in the Week After the Coldcard Hack

Short answer: On August 10, 2026, data showed that U.S. spot bitcoin ETFs took in more than $850 million the previous week, their strongest weekly inflows since April, right after the Coldcard hardware wallet hack drained an estimated $114–130 million in bitcoin. Analysts read the flows as some investors choosing regulated custody over self-custody, even though bitcoin's price barely moved.

What happened

A spot bitcoin exchange-traded fund (ETF) is a listed fund that holds bitcoin directly and lets investors buy shares through a regular brokerage account. In the week of August 3–7, 2026, U.S. spot bitcoin ETFs recorded more than $850 million in net inflows, as reported on Monday, August 10. BlackRock's iShares Bitcoin Trust (IBIT) captured most of the money, with funds from Fidelity, Morgan Stanley and others also taking part.

The flows followed the Coldcard incident. Coldcard is a popular bitcoin-only hardware wallet made by Coinkite. A firmware flaw allowed attackers to predict secret key material and drain affected wallets remotely, without physical access to the devices. Researchers cited by CoinDesk counted roughly 1,816 BTC (about $114 million) moved out of more than 5,200 addresses since July 30, and later estimates put total losses at about $130 million.

Bitcoin ETF inflows before and after the Coldcard hack

The flat price matters. Inflows of this size did not lift bitcoin above the $65,000 resistance that capped it all week, which suggests part of the demand was a shift in how investors hold bitcoin rather than a wave of new buyers.

ETF vs self-custody: what the Coldcard hack changed

Eric Balchunas, senior ETF analyst at Bloomberg Intelligence, said the Coldcard hack could make spot bitcoin ETFs more appealing to some investors. Robert Mitchnick, BlackRock's global head of digital assets, stressed that the incident was not a breach of Bitcoin itself but a failure in how individual keys were secured, and that ETF buyers want a simple, trusted vehicle without the security burden.

Both approaches carry real but different risks:

• Self-custody gives you direct ownership and the ability to send coins anywhere at any time. The flip side is that device flaws, lost seeds and phishing are your losses to absorb, with no one to reverse them.
• ETFs remove key management entirely, but you own fund shares, not bitcoin. You cannot withdraw coins, you pay a management fee, you trade only during market hours, and you depend on the issuer and its custodian. Balchunas noted that a custodian breach would likely bring immediate regulatory and law enforcement attention.
• Exchanges sit in between: convenient, but the platform holds your coins until you withdraw.

Since their approval by the U.S. Securities and Exchange Commission (SEC) in January 2024, spot bitcoin ETFs have become one of the most successful ETF launches ever and hold about $80 billion in assets, according to Bitcoin Magazine.

What it means for you

The lesson of the Coldcard hack is not that self-custody is broken, but that one device and one seed are a single point of failure. If you keep bitcoin yourself:

• Check whether your device and firmware are affected, and rely only on the manufacturer's official channels. Scammers impersonate wallet makers after every incident.
• If a seed may have been created with flawed firmware, moving funds to a newly generated seed is what protects them; a firmware update alone does not.
• Consider spreading large holdings across more than one wallet type, or a multisig setup, so a single vendor flaw cannot drain everything. Our crypto wallet security guide covers the basics.
• When moving coins to a new wallet, send a small test transaction first and double-check the address.

Key takeaways

• U.S. spot bitcoin ETFs drew more than $850 million in the week of August 3–7, 2026, the most since April.
• The inflows followed the Coldcard hack, with about 1,816 BTC (roughly $114 million) tracked as stolen and estimates up to about $130 million.
• BlackRock's IBIT took most of the money; bitcoin stayed near $64,000.
• ETFs trade key-management risk for issuer and custodian risk; self-custody keeps direct control but requires careful key hygiene.

If you are weighing where to hold coins, our comparison of an instant exchanger and a centralized exchange explains who holds your funds at each step.

Sources: Bitcoin Magazine, PYMNTS, CoinDesk