Can Quantum Computing Really Break Bitcoin? Understanding Q-Day, Which Wallets Are Most at Risk, and Why the Community Hasn't Upgraded Yet



[Plain Language Guide] The most daunting quantum threat to Bitcoin may not be "hackers suddenly breaking into the network," but rather someone quietly forging signatures one day and legitimately moving coins from old addresses and abandoned wallets.

Q-Day isn't a sci-fi term—it's a governance stress test: Should unmigrated old coins be frozen? Should new addresses be forced upon users? The very feature that decentralization prides itself on may become the slowest link when it comes to quantum-resistant upgrades.

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