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

The looming threat of quantum computing has sparked intense debate among Bitcoin's prominent developers, with vastly differing opinions on the best course of action. Blockstream CEO Adam Back emphasized the importance of proactive preparation, urging developers to start building optional quantum-resistant upgrades immediately. This approach, he believes, is safer than waiting for a crisis to emerge. Back highlighted his company's experiments with quantum-resistant transaction signatures on the Liquid network, a sister chain to Bitcoin, and noted that the 2021 Taproot upgrade was designed to accommodate new signature methods without disrupting current users. His comments come on the heels of a proposal by Jameson Lopp, which suggests phasing out quantum-vulnerable addresses over a fixed five-year timeline and freezing non-compliant coins. This proposal has significant implications, as it could affect approximately 1 million bitcoin attributed to Satoshi Nakamoto and an estimated 5.6 million inactive coins. Back's stance serves as an implicit alternative to Lopp's proposal, emphasizing the ability of Bitcoin's developer community to respond swiftly to a sudden quantum breakthrough. The core disagreement between the two positions centers on whether Bitcoin's governance can handle an emergency without pre-scheduled freezes. While Back believes that developers can coordinate quickly in the face of an accelerated threat, Lopp argues that a scheduled freeze is necessary to avoid a disorderly migration under pressure. Recent research by Google and Caltech researchers suggests that functional quantum computers capable of breaking Bitcoin's cryptography may arrive sooner than expected, bringing the debate to the forefront.