Bitcoin Unveils Two New Quantum Defense Strategies Without Full Upgrade

(AsiaGameHub) –   Developers are creating contingency plans for a potential threat that is likely still years in the future. One approach aims to secure high-value transactions immediately, while another seeks to provide wallet owners a way to verify ownership should conventional digital signatures become vulnerable.

Good to Know

• According to a StarkWare proposal, Bitcoin transactions can be secured against quantum computers now without altering the core protocol, although the technique is costly.
• Lightning Labs CTO Olaoluwa Osuntokun has demonstrated a functional prototype that allows a user to prove wallet ownership from a seed phrase without disclosing the seed itself.
• Google announced in March that next-generation quantum systems could potentially break elliptic curve cryptography using significantly fewer resources than previously thought.

Currently, there is no inexpensive or swift solution available. Instead, Bitcoin has two preliminary contingency strategies that address the same quantum risk from different angles. StarkWare’s approach focuses on securing transactions, whereas Lightning Labs targets wallet recovery.

Fix No.1

StarkWare’s Avihu Levy introduced a concept called Quantum Safe Bitcoin (QSB). This method bypasses the standard elliptic curve signature process, opting instead for a hash-based computational puzzle. Essentially, the sender repeatedly guesses an input until the output resembles a valid signature. Levy contends that a powerful quantum computer would not have the same mathematical advantage against this method as it would against elliptic curve cryptography.

While promising, the compromise is significant. A single transaction could require between $75 and $150 in GPU computing power, with some estimates nearing $200 based on the configuration. Furthermore, QSB is not easily scalable, creates non-standard transactions, and is incompatible with the Lightning Network. Consequently, this design is better suited for large Bitcoin transfers rather than everyday payments.

Fix No.2

The second strategy takes a distinctly different path. Olaoluwa Osuntokun developed a prototype enabling a user to demonstrate that a wallet was generated from a specific seed phrase without ever revealing the phrase. This verifies ownership by establishing the wallet’s origin, sidestepping the conventional signature method that a future quantum computer could compromise.

The prototype’s performance is already respectable. Demonstrations indicated that generating a proof takes approximately 50 seconds on a standard laptop, verification requires under two seconds, and the proof file is about 1.7 megabytes. Although there is no deployment schedule yet, the concept has advanced beyond theoretical discussion.

Google’s recent findings have intensified the focus on this issue. In March, its researchers suggested that future quantum computers might need a much smaller number of physical qubits to break cryptographic systems like those used in Bitcoin. This does not indicate an imminent threat, but it does add a sense of urgency to preparedness efforts.

A more complex aspect of the debate involves existing vulnerabilities. Older P2PK wallets, where public keys are visible on the blockchain, are often cited as a weak link in quantum risk assessments. This is a primary reason the community remains divided on solutions like protocol upgrades, coin freezing, or emergency measures. Neither QSB nor the Lightning Labs prototype resolves this fundamental dispute. They simply provide Bitcoin with additional time and flexibility while a comprehensive, long-term protocol solution remains under development.