The non-profit Presidio Bitcoin has published a report detailing the increasing threat that quantum computing poses to the Bitcoin network.
This report examines the current state of quantum computing, the potential risk it poses to Bitcoin’s value, existing ways to lessen that risk, and how the Bitcoin community could work together to update its software and protect it.
Why Upgrades Are Harder In A Decentralized System
Presidio Bitcoin starts with a basic idea: Bitcoin is essentially software, and this is both what makes it strong and what makes it vulnerable. Because it’s created using code, Bitcoin can be easily transferred, confirmed, and stored.
It also faces digital security risks due to its dependence on encryption. A major concern, debated since the beginning of Bitcoin, is the potential development of powerful quantum computers capable of breaking that encryption—often called CRQCs.
A powerful quantum computer, if built, could potentially crack the encryption that secures Bitcoin by allowing someone to figure out the private keys associated with public keys. The main risk, according to reports, would be the theft of Bitcoin from accounts where the public keys are known.
The report finds that Bitcoin has a wide range of tools to address potential issues, and implementing them is technically possible right now. However, fixing problems with Bitcoin is more complex than it would be for systems controlled by a central authority.
It’s simpler to coordinate changes in systems where a central authority exists. However, with Bitcoin, making updates requires agreement and implementation across a much wider range of parties – including developers, users, wallet providers, custodians, and those who maintain the network – which is a more challenging process.
Changing to new security methods too soon, or without careful planning, could introduce new weaknesses. Presidio also points out that these advanced security systems aren’t perfect – they involve real-world compromises and challenges for everyone involved, not just technical hurdles.
6.5 Million Bitcoin Could Be At Risk
The main issue is Shor’s algorithm. According to Presidio, if a quantum computer becomes powerful enough, it could use this algorithm to figure out the private keys associated with public keys, potentially compromising security.
The report offers a clear calculation of the potential impact: if a powerful quantum computer capable of breaking encryption existed now, around 6.5 million Bitcoin – about one-third of all Bitcoin in circulation – would be at risk of being stolen.
Over two-thirds of the potential security risk – around 4.5 million Bitcoin – stems from people using the same Bitcoin addresses multiple times. The report indicates this repeated use is largely due to a few major Bitcoin storage companies choosing this simpler method.

Although this situation does create some risk, Presidio notes it can be easily lessened without altering the current system. The solution is simple: switch to new addresses.
The remaining risk comes from a different source. Presidio estimates that 1.72 million Bitcoin is locked in older-style transactions (pay-to-pubkey), and most of it is likely unrecoverable.
Currently, addresses that haven’t been used and only show a public key hash on the blockchain are considered safe, even if the private key were to be compromised.
The Uncertain Clock For CRQCs
One of the report’s main points is the unpredictable timeframe for when powerful quantum computers will arrive. Presidio highlights that experts estimate there’s about a 50% chance these machines – capable of breaking current encryption – will appear between 2030 and 2035.
Presidio proposes a clear plan for the future of the Bitcoin network. This plan focuses on gradually updating the network’s security using post-quantum signature schemes through a soft fork – a less drastic change than a hard fork.
The crucial part of preparing for quantum-resistant cryptography is timing, and Presidio believes the Bitcoin network will successfully implement these new security measures long before quantum computers pose a real threat.
The report mentions Chaincode expects activation to happen around months six or seven, assuming it isn’t completed sooner. Once activated, the migration process would begin.
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2026-04-15 08:29