The recent Coldcard wallet security incident has sparked fresh discussion about whether holding Bitcoin through a spot ETF may be safer than managing private keys yourself.
Bloomberg Intelligence senior ETF analyst Eric Balchunas argued that, for investors who only want Bitcoin price exposure, a U.S. spot Bitcoin ETF eliminates one of the biggest risks: self-custody.
His comments came after Galaxy Research estimated that three suspected attack waves drained 1,367 $BTC (around $89 million) from 4,585 wallets affected by the Coldcard vulnerability.
"Yes, an ETF fixes this," Balchunas wrote, while acknowledging that many Bitcoin supporters still criticize ETFs as "paper Bitcoin."
However, there is no evidence yet that the incident has caused investors to move money into Bitcoin ETFs. U.S. markets were closed when the comments were made, so ETF flow data is not yet available.
What Happened?
According to Block's Bitcoin engineering team, the issue was caused by a firmware bug that weakened the randomness used during seed generation on certain Coldcard devices.
Coinkite confirmed that affected devices include:
Mk2 and Mk3 running firmware versions 4.0.1–4.1.9
Some seeds created on Mk4, Mk5, and Q devices before patched firmware releases
Although updated firmware fixes the vulnerability, it does not repair old wallet seeds. Users who generated seeds on vulnerable firmware should create a new wallet and transfer their Bitcoin immediately.
Galaxy Research estimates the attacks unfolded in three separate waves, with total losses reaching approximately $88.6 million, though this remains an on-chain estimate rather than a final confirmed figure.
Why ETFs Entered the Conversation
Unlike hardware wallets, spot Bitcoin ETFs remove the need to:
Store recovery phrases
Update firmware
Manage private keys
Move funds between wallets
Instead, these responsibilities are handled by regulated custodians.
For example, BlackRock's iShares Bitcoin Trust (IBIT) uses Coinbase Custody and may also use Anchorage Digital Bank to safeguard Bitcoin through institutional-grade cold storage and strict security controls.
This makes ETFs attractive for long-term investors, retirement accounts, and financial advisors who want Bitcoin exposure without the complexity of self-custody.
But ETFs Aren't Risk-Free
While ETFs eliminate seed phrase risk, they introduce different risks.
Investors own ETF shares, not actual Bitcoin, meaning they cannot withdraw coins to a personal wallet or use them for on-chain transactions.
ETF providers also disclose potential risks such as cyberattacks, operational failures, and custodian-related issues. In short, ETFs transfer custody risk to professional institutions—they do not eliminate it entirely.
No Proof of ETF Demand Yet
The Coldcard exploit has renewed the debate between self-custody and institutional custody, but there is no confirmed evidence that it has increased demand for Bitcoin ETFs.
Future ETF inflow data may provide more insight, but any changes could also be influenced by Bitcoin's price, broader market conditions, and investor sentiment.
Bottom Line
The Coldcard incident is a reminder that self-custody comes with real responsibilities. For some investors, managing private keys remains worth the independence. For others, a regulated spot Bitcoin ETF offers a simpler way to gain Bitcoin exposure while leaving custody to professional institutions.