Coinbase has published a blog post urging Bitcoin developers to start preparing the network for the threat posed by quantum computers, arguing that waiting until the danger becomes acute would leave too little time to act. The exchange warns that updating Bitcoin's consensus rules and migrating the wider ecosystem to quantum-resistant cryptography could take several years once the process begins.
"We believe it is important to begin preparations long before the announcement of a cryptographically relevant quantum computer," Coinbase wrote. The company argues that the scale of Bitcoin's infrastructure, from wallets to exchanges to custodians, means any migration to new cryptographic standards needs lead time that cannot be compressed once a quantum threat becomes concrete.
For European users of the network, who rely on Bitcoin's security guarantees as much as holders anywhere else, the warning is a reminder that the cryptographic foundations of the asset are not static and may require coordinated upgrades across wallets, exchanges and custodians operating in the region.
New signature schemes and a gradual transition
Coinbase is advocating the introduction of new signature schemes designed to resist attacks from quantum computers, while favouring flexible solutions that would allow additional cryptographic methods to be added or swapped in later as the technology evolves. During a transition period, the company says, wallets could support both the current signature scheme and new quantum-safe alternatives simultaneously, allowing users to migrate without a disruptive cutover.
As a possible technical basis for this work, Coinbase points to BIP 360, a Bitcoin Improvement Proposal that could underpin the shift toward post-quantum signatures. "That's why it's important that we start this work now," the company said, framing the proposal as a starting point for discussion rather than a finished solution.
The question of dormant coins
Coinbase's post also raises the more contentious issue of early-era Bitcoin holdings, the coins mined or received in the network's first years that have sat untouched in wallets using older cryptographic formats. The company includes these holdings among the cases that will need discussion as part of any quantum transition, but insists that the debate over how to handle lost or inactive coins must not be allowed to delay the technical preparation itself.
Coinbase frames the overall effort as a matter of preserving trust in the asset over the long term, saying the goal is "that Bitcoin will remain the most trustworthy cryptocurrency even in a world after the advent of quantum computers."
A physicist's view
Quantum physicist Markus Pflitsch, speaking with BTC-ECHO, said the industry should not wait for the so-called Q-Day, the hypothetical moment a cryptographically relevant quantum computer becomes operational. Pflitsch said the necessary technologies to prepare Bitcoin already exist and that the transition itself will require time, echoing Coinbase's call to begin the work well in advance rather than in response to an emergency.
