Quantum Computing Poses Severe Security Risks to Cryptocurrency Wallets
Europol issued a warning on October 7, 2026, highlighting that future quantum computers could compromise the security of cryptocurrency wallets. The main vulnerability lies in the cryptographic keys used to secure wallets and authorize transactions. If a public key is exposed, a powerful quantum computer could potentially calculate the corresponding private key, allowing unauthorized access to the funds.
This security threat is particularly significant for Bitcoin (BTC), where older addresses expose public keys. Currently, more than 4.3 million BTC, valued at over $360 billion, are stored in these vulnerable older addresses, which includes about 1.1 million BTC linked to the creator Satoshi Nakamoto. Although modern addresses offer better security, public keys can still become temporarily visible during the confirmation window of a transaction. On the day of the warning, Bitcoin fell 2.62% to trade at 83,320 USD.
Beyond immediate key vulnerability, there is also a risk of attackers harvesting encrypted data today to decrypt it later once quantum technology matures. To prevent rushed security upgrades in the future, developers and wallet providers are being urged to transition early to post-quantum cryptographic standards.
Key points
- Cryptographic keys used to secure wallets and approve transactions face the highest risk from quantum attacks.
- Over 4.3 million Bitcoin, worth more than $360 billion, are stored in older addresses that expose public keys.
- Modern addresses are safer, but public keys can still be exposed while transactions await confirmation.
- There is a risk of attackers harvesting encrypted data now to decrypt it later when quantum computers are available.
- Developers and wallet providers are urged to begin an early transition to post-quantum security measures.
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How we writeDisclaimerQuestions and answers
How does quantum computing threaten cryptocurrency wallets?
Quantum computers could use an exposed public key to calculate the private key, allowing attackers to access funds and approve unauthorized transactions.
Are all Bitcoin addresses vulnerable to quantum attacks?
Older Bitcoin addresses that expose public keys are highly vulnerable, holding over 4.3 million BTC. Modern addresses are safer but still briefly expose keys during transaction confirmation.
What is the harvest now decrypt later threat in crypto?
This occurs when attackers collect and store encrypted data today, intending to decrypt it years later when powerful quantum computers become available.