New Wallet Offers Protection Against Bitcoin's Quantum Risk Without Requiring a Network Update

The developers of a newly launched wallet claim to have devised a method for mitigating the risks associated with quantum computing by utilizing a smart contract layer that operates in tandem with the Bitcoin network, eliminating the need for any alterations to the network itself. On Tuesday, Postquant Labs unveiled Quip Network's post-quantum Bitcoin wallet, which operates on the Arch Network. This system enables developers to create smart contracts that are directly anchored to Bitcoin, rather than relying on a separate chain or wrapped tokens. The Quip wallet incorporates a post-quantum signature scheme known as WOTS+, which is based on the Winternitz One-Time Signature technique. This cryptographic method has been extensively tested and does not rely on elliptic curve mathematics, making it resistant to quantum computer attacks. By leveraging a 'Layer 2' network, which is a separate network built on top of Bitcoin for processing transactions and settling them on the main chain, developers can introduce new features without modifying the base layer of Bitcoin. According to Postquant Labs CEO Colton Dillion, 'The Bitcoin community has delayed addressing the quantum problem for years, despite it being discussed by Satoshi himself. While developers estimate that a protocol upgrade could take 5 to 10 years, our approach provides similar protection immediately.' The launch of Quip's wallet occurs amidst an ongoing debate within the Bitcoin community regarding the best approach to address quantum risk. Recently, prominent developer Jameson Lopp, along with five others, proposed BIP-361, which aims to phase out quantum-vulnerable addresses within a fixed five-year timeline and freeze coins that fail to migrate. This includes the approximately 1.1 million Bitcoin attributed to the pseudonymous creator Satoshi Nakamoto. Paul Sztorc's controversial eCash hard fork proposal involves creating a copy of the Bitcoin chain, accompanied by seven sidechains, including one that is quantum-resistant. This proposal has been partially funded by reassigning Satoshi-pattern coins on the new ledger to investors. Both proposals have faced pushback from the community, with Quip's approach arguing that neither is necessary. Their setup does not require a soft fork, consensus change, or community vote. A key point of contention among the three approaches is the degree of protection offered by Layer 2 solutions like Quip's. Lopp argues that such protection is insufficient because Bitcoin mainnet public keys are still vulnerable to leakage when a user broadcasts a transaction, providing a potential target for future quantum attacks. However, there are some caveats to consider. The wallet app is scheduled to launch the following week, and a third-party audit is currently underway but not yet complete. While Quip's quantum-resistant accounts are already available on Ethereum and Solana, the Bitcoin deployment is new, and the Arch Network is still in its early stages. Postquant Labs CTO Dr. Richard Carback, who has collaborated with eCash inventor Dr. David Chaum, now an advisor to the project, claims that their approach reduces the window of vulnerability to a quantum attack to as little as two blocks, approximately 20 minutes. The outcome of this debate will partly depend on the pace at which quantum computers become a reality. Historically, Bitcoin holders most concerned about quantum risk have been the same group most resistant to using wrapped or smart-contract-anchored products.