Since April, Bitcoin and Ether ETFs Soar With $1.1B Surge

Bitcoin and Ethereum spot ETFs in the United States drew a combined $1.1 billion in net inflows for the week ending August 8, the strongest weekly total since April. The figure arrived against a backdrop of unusually thin trading volume, making the sustained buyer commitment across the week more striking than the headline number alone suggests.

Several Bitcoin funds have held positive daily inflows every session since a Coldcard hardware wallet exploit was made public, a streak that points to custody reallocation, not momentum trading, as the dominant force.

Key Takeaways

• Bitcoin and Ethereum spot ETFs drew a combined $1.1 billion in net inflows for the week ending August 8
• The last comparable inflow week before this occurred in April, driven by rate-cut expectations
• Approximately $111 million in Bitcoin was affected by the Coldcard hardware wallet exploit
• Bitcoin traded near $65,000 through the week, holding a range rather than trending sharply

Bloomberg Intelligence analyst Eric Balchunas tied the run directly to the Coldcard breach, making the observation to The Block, where the data recorded the daily inflow streak. Approximately $111 million in Bitcoin was affected by the exploit, as Fathom reported when it emerged, a large enough loss to force a visible reassessment of self-custody risk across a meaningful slice of the holder base.

How A Hardware Wallet Exploit Becomes An ETF Catalyst

A spot ETF, in plain terms, is an exchange-traded fund that holds the underlying asset directly rather than a futures contract.

When an investor buys a share, the issuer purchases actual Bitcoin or Ether and stores it with a regulated custodian, typically an entity like Coinbase Custody operating under strict security and insurance frameworks. The investor never touches private keys.

A hardware wallet works on the opposite principle.

It stores a user’s private keys offline on a physical device, giving the owner direct, unmediated control over their coins. Coldcard, made by Canadian firm Coinkite, is one of the most trusted devices in this category, popular among security-conscious self-custody advocates.

When the Coldcard exploit became public, it forced a reassessment of that risk calculus.

For holders weighing custodial risk, the breach made regulated ETF custody look comparatively safer for at least a portion of their holdings.

That logic, repeated across enough accounts, generates measurable ETF inflow. Since April, when the last comparable inflow week occurred, the macro case for ETFs has softened, making this security-driven rotation all the more notable as a distinct mechanism.

Since April, Custody Risk Has Replaced Rate Bets As The Inflow Driver

The dynamic Balchunas identified follows a recognisable pattern.

After every major self-custody failure, a share of affected or spooked holders redirects capital toward intermediated products. The pattern appeared after exchange collapses too, though in reverse: exchange failures have historically pushed users toward self-custody, while self-custody failures push them back toward regulated wrappers.

The Coldcard event represents the latter.

Also Read: Bitcoin and Ether Soar Past Struggling XRP in 5-Week Surge

Since April, flows across June and July had been modest or flat. What makes this week’s Bitcoin (BTC) ETF inflows unusual is the combination of scale and context.

Inflows of this size arriving during a low-volume summer week suggest the buying is not momentum-driven speculation. Volume tends to amplify price momentum.

The absence of elevated volume alongside strong inflows implies deliberate, directional positioning rather than traders chasing a short-term move.

Bitcoin traded near $65,000 through the week, holding a range rather than trending sharply in either direction. Ethereum (ETH) tracked a similar pattern. Neither asset produced the price acceleration that normally accompanies a billion-dollar weekly inflow reading.

That further supports the interpretation that the buying was custody-reallocation rather than fresh speculative entry.

Since April, this is the first week where that reallocation logic has shown up at scale in the data.

The April Comparison And What Comes Next

The last time the two-asset ETF complex matched or exceeded this week’s pace was April, when inflows were driven by a different set of macro conditions. Rate-cut expectations had become more concrete in the spring, and institutional allocators were adding exposure ahead of anticipated dollar weakness.

Since April, that appetite faded through May and June as the Federal Reserve held rates steady and summer liquidity dried up.

Since April, the custody infrastructure argument, long present in analyst notes but rarely the dominant flow driver, has gained measurable weight. Balchunas’s point about daily inflows holding since the Coldcard breach suggests the catalyst has a tail.

As long as uncertainty around hardware wallet security persists and no new resolution to the Coldcard case emerges, the custody argument for ETFs remains live.

The more durable question is whether the security-driven inflow thesis can outlast the news cycle. Previous security events that generated short-term ETF interest faded within two to three weeks once attention moved on.

Since April set the prior high-water mark under entirely different conditions, a second consecutive strong week at this scale would signal something more structural: a lasting shift in how a subset of Bitcoin holders thinks about custody risk.

The physical reality is that regulated custodians hold finite capacity, operate under defined insurance ceilings, and charge for the service. If this rotation continues, the cost and capacity constraints of institutional custody become the next bottleneck worth watching, and the capital spending decisions of custodians, not their public assurances, will be the most reliable signal of whether the infrastructure can absorb it.

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