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Bitcoin \'Q-Day\' preparations accelerate as quantum threat solutions split into three tracks

The bitcoin industry and researchers are stepping up work to prepare for a potential future security threat from quantum computers, even though so-called Q-Day remains hypothetical. Efforts are moving on three tracks: quantum-resistant transactions that keep existing rules, upgrades to the bitcoin protocol to adopt new signatures, and stronger custody systems at exchanges and custodians. Each approach has limits, and the key issue is the gap between quantum computing progress and defensive readiness.