Olaoluwa Osuntokun of Lightning Labs has developed a system that allows users to recover funds in the event of a defensive upgrade against quantum computers.
Olaoluwa “Roasbeef” Osuntokun, CTO of Lightning Labs, has unveiled the first working prototype of a tool designed to safeguard Bitcoin wallets in the event of an emergency upgrade activation against quantum computers. The announcement came on April 8, 2026, through a post to the Bitcoin developers mailing list.
The problem the prototype aims to solve is a specific one: one of the main quantum defense proposals for Bitcoin, known as BIP-360 and incorporated into the improvement proposals repository in February as a draft, includes the possibility of disabling the current digital signature system at the network level – the so-called “emergency brake”. This drastic measure would prevent a quantum computer from forging signatures and draining funds, but would simultaneously leave all wallets locked – particularly the Taproot wallets introduced in 2021 – that rely solely on that mechanism to authorize transactions. Funds would effectively be untouchable even by their legitimate owners.
Osuntokun’s prototype works as an alternative exit route: instead of proving ownership through a digital signature – the mechanism a quantum attack could compromise – the system allows the user to mathematically prove they created the wallet using the original secret seed, without having to reveal it. This way, using the tool to recover a wallet does not put other wallets derived from the same seed at risk. In essence, it replaces the concept of “I can sign this transaction” with “I can prove this wallet belongs to me”.
Tests on the prototype show concrete results: running on a high-end consumer MacBook, proof generation took approximately 55 seconds, while verification completed in under two seconds. The resulting proof file weighs around 1.7 MB, comparable to a high-resolution image. Osuntokun noted that the system was developed as a side project and has not yet been optimized.
At present, there is no formal proposal to integrate the tool into the Bitcoin blockchain, nor any deployment timeline. Developers remain divided on the actual urgency of the quantum threat: academic researchers point out that many of the so-called “breakthroughs” in quantum computing are based on simplified test conditions, and that a large-scale attack on Bitcoin would face difficult physical limitations to overcome – as recently highlighted in an academic study.
Osuntokun’s prototype nonetheless fills a theoretical gap that had long persisted in Bitcoin’s quantum threat contingency plan, offering a concrete solution to the ongoing debate on quantum computing and fund security.
