Coinbase has published technical recommendations urging the Bitcoin community to begin preparing for quantum-resistant upgrades well before cryptographic threats materialize. The exchange emphasizes that migration requires a multi-year timeline and must address block space constraints, node verification capabilities, institutional custody requirements, and wallet compatibility alongside new signature algorithms. The proposal suggests introducing output structures supporting quantum-resistant signatures and exploring hybrid authorization paths that allow funds to use both traditional ECDSA/Schnorr and post-quantum signatures simultaneously for a smooth transition. Coinbase also highlights the need for governance and technical solutions to address unmigrated funds, lost private keys, and exposed public keys that cannot be secured through standard migration processes.