Project Eleven Launches Bitcoin Wallet Ownership Proof Solution for Post-Q-Day Era

security firm Project Eleven has introduced a post-quantum proof technology designed to help users prove ownership of their Bitcoin wallets after quantum computers become capable of deriving private keys and generating valid signatures. Project Eleven CEO Alex Pruden stated that the technology utilizes the wallet's key derivation path, enabling users to prove control without disclosing the parent key, thus distinguishing legitimate owners from attackers. The solution was developed in collaboration with Jim Posen, a primary maintainer of the open-source Binius zero-knowledge proof system, and is based on the "signature lifting" technique proposed by Alon Sattath and Robert Wyborski. Project Eleven noted that the prototype has not yet been audited and requires blockchain protocol support before it can be deployed. It is primarily aimed at users who miss the window to migrate to quantum-resistant addresses in the future.