The following is a summary of the information that you will find on this page.
- Theoretically, quantum computers could break the elliptic-curve encryption of Bitcoin. However, there is no such machine yet.
- Google researchers say cracking Bitcoin’s encryption may require fewer than 500,000 qubits — below the “millions” often cited.
- BIP-360, BIP-361 and BIP-365 propose that Bitcoin transactions are quantum-resistant and that legacy signatures be phased out.
- Ethereum aims to achieve quantum resistance through Strawmap in 2030. Ripple is working on a plan that will make the XRP Ledger ‘quantum-proof’ by 2028.
- Risk is real “harvest now, decrypt later” — adversaries collecting encrypted data now to crack it when quantum computers mature.
Although quantum computers theoretically have the ability to break Bitcoin’s cryptography using elliptic curves, no machines capable of this exist yet. Crypto investors must know the facts about the threat of quantum computing, how defenses are being developed, and what timeline is important.
Quantum threat to Bitcoin: What does it mean?
Bitcoin’s digital signature is based on the elliptic curvature algorithm. A user’s private key creates a digital signatory that is then verified by the Bitcoin network with the public key. The reason this works is that no classic computer could reverse-engineer a private key from a public key with any timeframe reasonable.
Quantum computers alter this equation. A sufficiently powerful quantum computer running Shor’s algorithm could derive a private key from a public key in minutes — potentially allowing an attacker to forge transactions and steal funds.
By April 2026 there will be no quantum computers that are capable of this. However, the timeframe is shrinking.
Quantum computers: How close to the Bitcoin breaking?
Google has published an article. whitepaper in early 2026 showing that breaking Bitcoin’s elliptic-curve cryptography may require fewer than 500,000 physical qubits — well below the “millions” Statistic commonly used. Google researchers believe that a powerful enough machine can crack Bitcoin’s cryptography core in less than nine minutes.
Giancarlo lelli, using readily available quantum hardware in April of 2026, broke the 15-bit key to an elliptic curvature, and claimed 1 BTC as a reward from Project Eleven. Bitcoin uses 256-bit keys, so the gap remains enormous — but the achievement represents a 512-fold improvement over September 2025.
In April 2026, Nobel-winning physicist Serge Haroche predicted that Bitcoin would be a target for quantum computing. Six cryptographers from Coinbase concluded that the machine was a quantum computer. “will eventually be built” Migration must start now.
Can quantum computers attack Bitcoin mining?
No — at least not practically. April 2026 research shows attacking SHA-256 mining would require approximately 10²³ qubits and 10²⁴ watts — approaching the power output of a star. Real vulnerability lies in the transaction signing process (ECDSA), and not in mining (SHA-256).
What are the steps being taken to protect Bitcoins?
BIP-360: quantum-resistant transactions
BIP-360 offers Pay-to-Merkle-Root, a transaction using ML-DSA Signatures approved by NIST. BTQ Technologies demonstrated BIP-360 working transactions on the testnet.
BIP-361: legacy signature sunset
BIP-361, authored by Jameson Lopp et al., defines a gradual migration from legacy signatures.
- Phase A (3 Years) Blocking new money to addresses that are vulnerable.
- Phase B (5-year plan) The signatures of ECDSA or Schnorr are invalidated.
Adam Back, Hashcash’s inventor, advocates for quantum-resistant features to be optional now. Other people push migration deadlines that are mandatory.
Google Taproot Warning
Google’s researchers discovered that the Taproot upgrade for Bitcoin in March 2026 may be more vulnerable to quantum attacks than anticipated by making public keys available. Although not dangerous today, it makes BIP 360 migration more urgent.
What are the other blockchains doing to prepare?
Ethereum: Vitalik Buterin “Strawmap” The target date (February 2026) is quantum resistance in consensus, accounts and ZK proofs. Glamsterdam and Hegotá forks are confirmed for 2026. Find out more about Ethereum’s quantum resistance plans.
XRP Ledger: Ripple has a four-phase strategy that aims to achieve quantum resistance in 2028. Ripple and Project Eleven have partnered to test validators for ML-DSA. Ripple’s four-phase plan targets quantum resistance by 2028. Learn more about Ripple’s quantum-resistant XRP Ledger roadmap.
Hedera (HBAR): Hash-based encryption is already in use. The migration plans align with NIST’s post-quantum encryption (PQC).
NIST post-quantum standards
NIST published three PQC standards by August 2024. They were MLKEM for encryption, MLDSA for signatures and SLHDSA for hash-based backup. In March 2025, it added HQC to its backup standards. Google is committed to a full migration of PQC by 2029.
What can crypto-investors do right now?
- Don’t panic — no quantum computer can break Bitcoin today. The threat window is 5–10 years.
- Address reuse is not recommended — unexposed public keys are safe from quantum attacks.
- Watch BIP-360 & BIP-361 — mandatory migration may require action from all Bitcoin holders.
- Diversify your custody — hardware wallets will need firmware updates for post-quantum signatures.
- NIST Standards — blockchains adopting PQC standards first gain a trust advantage.
The ‘harvest now, decrypt later’ risk
It is possible that state-level opponents are already collecting blockchain data encrypted to be decrypted later using quantum computers. Any public key exposed is potentially a target for the future. BIP-360/BIP-361’s urgency is to protect historic data from machines of the future.
FAQ
Can quantum computers hack Bitcoin right now?
No. In 2026, the most powerful quantum computer will have approximately 1,500 qubits. To break 256-bit ECDSA, you would need 500,000 qubits or more. There is no such machine.
When will quantum computer be able break Bitcoin?
The consensus among Google and Coinbase advisors is 5–10 years. The machine is “at least two major engineering leaps away,” Migration itself can take years. Therefore, preparation should begin now.
Bitcoin Mining: Is it vulnerable to Quantum Attacks?
Practically not. A SHA-256 attack would require approximately 10²³ qubits and star-level energy output — well beyond any foreseeable technology.
What is BIP-360
The soft fork is a proposal to implement quantum-resistant Pay to Merkle Root transactions (P2MR) using NIST-approved Post-Quantum Signatures.
What is the BIP-361 standard?
The sunsetting of the legacy signatures will be phased out. After the third year, new funds will not be allowed to reach vulnerable addresses. The ECDSA signature and Schnorr signatures will be invalidated after year 5.
Ethereum is it quantum safe?
But not yet. Buterin’s “Strawmap” The target for quantum resistance is approximately 2030. This will be achieved by combining four layers – consensus, accounts and data accessibility, as well as ZK proofs.
Is XRP quantum-safe?
Ripple’s plan is divided into four phases, with a target date of 2028. AlphaNet is already running MLDSA signatures.
Do I need to move my Bitcoins?
Reusing addresses exposes your public key. Moving to a fresh address hides it — good practice regardless of the quantum threat.
What is ‘harvest now, decrypt later’?
The adversary gathers data encrypted today in order to decrypt it with future quantum computer. Once quantum computers are powerful enough, every exposed public key will be a target.
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Source: crypto.news
