New Wallet Offers Solution to Mitigate Bitcoin's Quantum Vulnerability Without Network Upgrade

The developers of a newly launched wallet claim to have devised a method to counter the risks associated with quantum computing by utilizing a smart contract layer that operates in conjunction with the Bitcoin network, eliminating the need for any modifications to the network itself. On Tuesday, Postquant Labs announced the introduction of Quip Network's post-quantum bitcoin wallet, which operates on the Arch Network. This system enables developers to create smart contracts 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 a tested cryptographic technique that does not rely on elliptic curve mathematics, thereby rendering it resistant to quantum computer attacks. By employing a 'Layer 2' network, which is a separate network built on top of Bitcoin to process transactions and settle them on the main chain, developers can introduce new features without altering Bitcoin's core layer. 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 occurs amidst an ongoing debate within the Bitcoin community regarding the best approach to addressing quantum risk. Prominent developer Jameson Lopp, along with five others, recently proposed BIP-361, which would phase out quantum-vulnerable addresses over a fixed five-year timeline and freeze coins that fail to migrate. This proposal has been met with resistance from the community. Paul Sztorc's contentious eCash hard fork proposal involves copying the Bitcoin chain and introducing seven sidechains, including a quantum-resistant one, partially funded by reassigning Satoshi-pattern coins on the new ledger to investors. Quip's approach argues that neither of these proposals is necessary, as their setup requires no soft fork, consensus change, or community vote. A key point of contention among the three approaches is the sufficiency of Layer 2 protection. Lopp argues that Quip's approach is insufficient because Bitcoin mainnet public keys are still vulnerable to quantum attacks the moment a user broadcasts a transaction. However, Postquant Labs CTO Dr. Richard Carback notes that their approach narrows the window for a quantum attack to as little as two blocks, roughly 20 minutes. The wallet app is set to launch next week, and a third-party audit is currently underway. While Quip's quantum-resistant accounts already exist on Ethereum and Solana, the Bitcoin deployment is new, and Arch Network is still in its early stages of development.