When a Bitcoin hardware wallet fails, the consequences are not abstract. Private keys are at risk, funds can be lost, and the foundational promise of self-custody — that you alone control your bitcoin — collapses in the most concrete way imaginable. The recent failure associated with Coldcard, one of the most widely trusted hardware signing devices in the Bitcoin ecosystem, has reignited a debate that goes far deeper than one product's shortcomings: the dangerous ambiguity between truly open-source software and the increasingly common "source-available" licensing model that mimics openness while quietly withdrawing its most important guarantees.
This distinction is not academic. As analyst and writer Juan Galt argued in Bitcoin Magazine, the entire edifice of Free and Open Source Software — commonly abbreviated as FOSS — rests on four essential freedoms articulated by the Free Software Foundation. These are: the freedom to run the software for any purpose, to study and modify its source code, to redistribute copies, and to distribute modified versions. The Open Source Initiative operationalizes these principles through its ten criteria for what qualifies as genuinely open source. Together, these frameworks are not bureaucratic checklists — they are the structural conditions that make community-driven security review possible.
The Coldcard situation exposes precisely what happens when those conditions are not fully met. Source-available licenses — the most prevalent example being MIT combined with a Commons Clause addendum — allow users to read and even modify code, but they withhold the commercial rights that define true openness. On the surface, this looks like transparency. In practice, it is something meaningfully different. When commercial use is restricted, the population of developers and security researchers who can engage deeply with that codebase shrinks substantially. Professional auditors, competing hardware vendors, and independent developers who might otherwise stress-test the code in adversarial real-world conditions are effectively locked out. The result is a reviewer pool that is smaller, less motivated, and less economically incentivized to find problems.
This matters enormously in the context of Bitcoin hardware wallets. The security model of a device like Coldcard depends not just on the quality of its internal engineering team, but on the adversarial scrutiny of the broader technical community. Bitcoin's own protocol has survived and hardened over more than fifteen years precisely because its code is genuinely open — anyone can examine it, fork it, compete with it, and improve it. When a hardware wallet vendor deploys source-available licensing instead of true FOSS licensing, they are implicitly asking users to trust the vendor's internal processes rather than the distributed immune system of a global developer community. That is a fundamentally different security proposition, and not a stronger one.
The incentive dynamics are also worth interrogating carefully. A vendor that operates under source-available licensing retains competitive moats — competitors cannot legally ship a product built on their code. That commercial protection is understandable from a business perspective. But it comes with a cost that is borne entirely by the end user: the security review burden shifts back to the vendor itself. A company auditing its own product faces structural conflicts of interest that no amount of good faith can fully resolve. When external reviewers are legally constrained from participating in ways that might generate commercial value, the feedback loop that makes open-source security robust simply does not operate at full strength.
It is worth being precise about what the Coldcard episode does and does not prove. A single hardware failure does not indict every design decision a company has ever made, and Coldcard's engineering team has a credible track record in the Bitcoin space. The lesson here is systemic rather than personal. The failure illustrates a vulnerability that is baked into the source-available model regardless of which vendor employs it: restricted licensing creates structural gaps in review coverage, and those gaps become attack surfaces — whether exploited by external adversaries or simply by the entropy of complex software systems running in high-stakes environments.
The broader Bitcoin community should take this as a prompt to sharpen its standards. Hardware and software that secures real economic value — and bitcoin wallets increasingly secure substantial real economic value for individuals who have opted out of custodial institutions — must be held to the same licensing standards as the protocol they serve. Accepting source-available code as a proxy for open-source code is a category error, and the Coldcard failure makes the consequences of that error tangible. Advocates, reviewers, and users alike should ask hard questions about the licenses governing the tools they depend on, and they should apply the FSF's four freedoms and the OSI's ten criteria as minimum requirements, not aspirational targets.
The deeper principle at stake is one Bitcoin's culture has always understood instinctively: trust is earned through verifiability, not through reputation. A closed or commercially restricted codebase asks users to trust a vendor. A genuinely open codebase asks users to trust mathematics, transparency, and the collective scrutiny of a global community. For a monetary system built explicitly on the premise that you should not have to trust anyone, the choice between those two models should not be a difficult one.
Written by the editorial team — independent journalism powered by Bitcoin News.