According to @AltcoinGordon, the cryptocurrency market faces an imminent and severe threat from quantum computing, which could render current blockchain encryption obsolete. Researchers cited in the analysis warn that 4 million Bitcoin (BTC), or roughly 25% of the usable supply, are vulnerable to theft once quantum computers become powerful enough. This risk is so significant that BlackRock has officially listed quantum computing as a critical risk factor in its Bitcoin ETF filing, stating it could "undermine the viability" of cryptographic algorithms. The threat is compounded by "Harvest Now, Decrypt Later" attacks, where nation-states are already collecting encrypted blockchain data to break in the future, a warning echoed by Jay Gambetta of IBM Quantum. While solutions like migrating to post-quantum cryptography exist, they could require extensive downtime for major networks like Bitcoin, potentially lasting 75 days or more and causing massive market disruption. This existential risk coincides with a dilution of crypto's original cypherpunk ideals, as major players like Coinbase increasingly align with state power structures, moving away from the movement's foundational goal of creating a decentralized counterweight to traditional systems.