The race to protect Bitcoin from the “quantum apocalypse” might actually be more dangerous than the threat itself. While tech giants and exchange executives call for an immediate shift toward Post-Quantum (PQ) cryptography, Bitcoin advocate and Jan3 founder Samson Mow is waving a massive red flag. He warns that a panicked transition could compromise the network’s current stability, effectively trading a future hypothetical risk for a very real present-day disaster.
The debate ignited following comments from Coinbase CEO Brian Armstrong and CSO Philip Martin, who urged the industry to prioritize quantum readiness. Mow’s counter-argument is simple: rushing a fix for a problem that doesn’t yet exist is the fastest way to break what’s already working.
The Hidden Risks of Post-Quantum Cryptography
Mow’s primary concern is that PQ signatures are not a “drop-in” replacement for current cryptographic standards. These new security measures are significantly bulkier. According to Mow, transitioning too early could introduce massive compatibility issues and weaken Bitcoin against standard cyberattacks. He famously summarized the irony of the situation on X, stating that we could “make Bitcoin safe against quantum computers just to get pwned by normal computers.”
Beyond basic security vulnerabilities, there is the issue of network efficiency. Today’s Bitcoin transactions are lean, but post-quantum signatures could be 10 to 125 times larger than current ones. Implementing them now would drastically reduce the number of transactions the network can process, potentially slowing the blockchain to a crawl and making fees skyrocket before a quantum computer is even built.
Why This Could Trigger “Blocksize Wars 2.0”
The most alarming part of Mow’s warning is the potential for renewed civil war within the Bitcoin community. Because PQ signatures require so much more data, their implementation would inevitably reignite the debate over Bitcoin’s block size—a conflict that nearly tore the community apart between 2015 and 2017.
Increasing the block size to accommodate these massive signatures isn’t just a technical change; it’s a philosophical one. Larger blocks can lead to centralization, as only those with high-end hardware can afford to run a full node. Mow fears that a rushed quantum fix would force the community back into these “Blocksize Wars,” risking the decentralization that makes Bitcoin valuable in the first place.
While Mow acknowledges that research into quantum resistance is vital, he emphasizes that we likely have 10 to 20 years before functional quantum computers pose a legitimate threat. For now, the consensus remains: preparation is smart, but panic is a vulnerability. The goal is to evolve Bitcoin without destroying the very efficiency and security that define it today.
