Bitcoin infrastructure company Blockstream has identified Falcon-1024 as the optimal lattice-based digital signature scheme for preparing Bitcoin against future quantum computer attacks. The recommendation comes from a Q3 business update released on November 5, which referenced an August report comparing three post-quantum signature candidates: Dilithium, Falcon, and Hawk. Researchers concluded that Falcon-1024 offers the best balance between data size, verification speed, and security foundation maturity. However, the team highlighted remaining challenges including finalizing the Falcon standard, obtaining verified implementations, and managing memory constraints on hardware wallets. Blockstream noted that hash-based signatures remain a more conservative short-term option, with potential hybrid approaches combining both methods once Falcon technology matures.