A Bitcoin transaction that prices $75 to $150 in GPU compute isn’t constructed for each day use, however it might nonetheless matter.
StarkWare chief product officer Avihu Levy has put ahead a scheme referred to as Quantum Secure Bitcoin, or QSB, that he says might make new BTC transfers immune to quantum assaults with out altering the Bitcoin protocol.
The proposal is designed to work even towards a big quantum laptop working Shor’s algorithm.
A Workaround Inside Bitcoin’s Present Guidelines
Levy’s plan stays inside the crypto’s present legacy script limits and doesn’t require a delicate fork. As a substitute of counting on elliptic curve math, QSB swaps in a hash-to-signature puzzle.
In easy phrases, the sender should discover an enter whose hash output occurs to seem like a sound ECDSA signature, a course of that is determined by brute-force work slightly than the sort of math quantum computer systems are anticipated to interrupt.
Supply: Github
That makes the scheme uncommon. It doesn’t attempt to rebuild Bitcoin from the bottom up. It tries to bolt on a slender protect utilizing guidelines that exist already.
The researchers describe it as a short lived reply whereas the larger query of its long-term quantum protection stays unsettled.
Reward, Pushback And A Slim Use Case
StarkWare CEO Eli Ben-Sasson referred to as the work “enormous” and stated it basically makes Bitcoin quantum-safe at the moment. However not everybody agrees with that framing.
Bitcoin ESG specialist Daniel Batten stated the declare goes too far as a result of the paper doesn’t deal with uncovered public keys or dormant wallets.
Supply: Github
He pointed to an estimated 1.7 million BTC sitting in early P2PK addresses that might be susceptible if a quantum laptop turns into highly effective sufficient to crack them.
The brand new scheme additionally comes with a pointy restrict on who may use it. In line with the proposal, it’s extra advanced than an ordinary BTC transaction and solely is smart for giant transfers. The reported compute value makes it a poor match for routine funds.
THIS IS HUGE. Bitcoin is Quantum-Secure TODAY.
Even when a quantum laptop appeared, one which breaks the traditional Bitcion signatures, it reveals a sensible method to create secure Bitcoin transactions. WITH NO CHANGE TO BITCOIN PROTOCOL!!! https://t.co/ireGc3ai7W
— Eli Ben-Sasson | Starknet.io (@EliBenSasson) April 9, 2026
A Short-term Repair, Not The Last Reply
The controversy round quantum threat has already cut up the Bitcoin group. Some argue for leaving Bitcoin unchanged to protect its unique design.
Others need susceptible cash frozen or burned. A separate group needs the protocol upgraded to help quantum-safe signatures.
Picture: Submit Quantum
Levy’s proposal lands in the midst of that battle, giving customers a last-resort possibility whereas skipping the necessity for network-wide consensus.
The researchers nonetheless say protocol-level modifications are the higher long-term path. Additionally they acknowledged that the QSB method is non-standard, doesn’t scale to all customers, and doesn’t cowl use instances such because the Lightning Community.
The timing of the paper issues too. Google revealed analysis in March that added contemporary stress to the controversy, and Lightning Labs chief expertise officer Olaoluwa Osuntokun adopted with a quantum fallback prototype on Wednesday.
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