Catenaa, Saturday, March 14, 2026- A new report from Ark Invest and Unchained says quantum computing could pose a future threat to bitcoin’s cryptographic security, but researchers say the risk remains years or even decades away.
The analysis finds that roughly 35% of bitcoin’s circulating supply could become vulnerable under worst-case scenarios if powerful quantum computers eventually break current cryptographic protections used by the network.
Bitcoin relies on two main cryptographic systems to secure the blockchain. The SHA-256 hashing algorithm secures blocks and mining operations, while Elliptic Curve Digital Signature Algorithm verifies wallet ownership and transaction authorization.
Researchers say quantum computers could eventually break the signature algorithm by reversing public keys to reveal private keys. That would allow attackers to gain control of funds stored in exposed wallet addresses.
The report says current quantum technology remains far from that capability. Today’s machines operate in the so-called Noisy Intermediate-Scale Quantum era with roughly 100 logical qubits. Experts estimate thousands of error-corrected qubits would be needed to run powerful cryptographic attacks such as Shor’s Algorithm.
Because of those limitations, researchers dismissed fears of a sudden “Q-Day” event where bitcoin security collapses overnight.
Instead, the report projects a gradual development path in which quantum breakthroughs would first affect widely used internet encryption systems before reaching cryptocurrency networks.
Researchers estimate that if quantum computers eventually reach the required scale, up to 6.9 million bitcoin could become exposed through vulnerable address formats.
About 1.7 million coins sit in early pay-to-public-key addresses that reveal public keys directly on the blockchain. Many of those coins date back to bitcoin’s earliest years and are believed to be permanently lost.
Another portion of the supply becomes temporarily exposed when older address types are reused during transactions.
The report notes that dormant coins are particularly vulnerable because they may remain unmoved during any migration period to stronger cryptography.
Despite the risks, researchers say bitcoin’s open developer ecosystem gives the network time to adapt. Software updates known as Bitcoin Improvement Proposals can introduce new cryptographic standards that resist quantum attacks.
Some developers are already exploring future upgrades designed to hide public keys until coins are spent or replace existing signature systems entirely.
Migration to post-quantum cryptography would likely occur through a gradual transition in which wallets adopt new address types while older coins are moved to upgraded formats.
The researchers say such a process could take years but would likely occur well before quantum computers reach the scale required to threaten bitcoin.
Governments and technology firms are also preparing for a quantum era. The National Institute of Standards and Technology has spent years developing new cryptographic algorithms designed to resist quantum attacks.
Those standards could eventually form the basis of upgraded security systems for financial networks, internet infrastructure and blockchain platforms.
Industry leaders increasingly view the quantum issue as a long-term engineering challenge rather than an immediate crisis.
As quantum research accelerates worldwide, analysts say the pace of technological breakthroughs will determine how quickly bitcoin developers must adapt.
For now, researchers conclude the threat remains theoretical, giving the cryptocurrency ecosystem time to plan defensive upgrades before quantum computers become powerful enough to challenge modern cryptography.
