Project Eleven, a start-up focused on shielding Bitcoin from advances in quantum computing, has raised $6 million in seed financing. The round was co-led by venture firms Variant Fund and Quantonation, with participation from Castle Island Ventures, Nebular and Formation. Chief Executive Officer Alex Pruden said the money will be used to develop “quantum-proof” wallet infrastructure and other security tools. Among the first products is Yellowpages, an off-chain registry that lets holders generate post-quantum key pairs and create verifiable proofs linking them to existing Bitcoin addresses, giving users a fallback if elliptic-curve cryptography is ever broken. The company is also offering the “Q-Day Prize,” a bounty of one bitcoin for the first team that can crack an elliptic-curve key with a quantum computer, underscoring what Pruden called an imminent threat that could emerge within the next decade. Backers argue that proactive measures are needed because a full protocol upgrade for Bitcoin would require broad consensus and could take years to implement.