Divided Opinion: Adam Back Advocates for Gradual Quantum-Resistant Upgrades in Bitcoin

The threat of quantum computing has sparked a heated discussion among Bitcoin's prominent developers, with vastly differing opinions on the best course of action. Adam Back, CEO of Blockstream, addressed attendees at Paris Blockchain Week, emphasizing the importance of developing optional quantum-resistant upgrades for Bitcoin. This approach, he argues, allows for a controlled and safer transition, rather than waiting for a crisis to occur. Back highlighted his company's experiments with quantum-resistant transaction signatures on the Liquid network, a sister network to Bitcoin, and noted that the 2021 Taproot upgrade provides a flexible framework for integrating new signature methods without disrupting the current network. His comments follow a proposal by Jameson Lopp to phase out quantum-vulnerable addresses within a fixed five-year timeline, which would result in the freezing of approximately 5.6 million inactive coins, including those attributed to Bitcoin's creator, Satoshi Nakamoto. Back's stance serves as an implicit alternative to Lopp's proposal, emphasizing the ability of Bitcoin's developer community to respond promptly to a sudden quantum breakthrough. The disagreement between Back and Lopp represents the core of the quantum debate, with Back betting on the community's ability to coordinate quickly and Lopp advocating for a scheduled freeze to avoid a disorderly migration.