Quantum computing poses a serious threat to Bitcoin's current security model. Research indicates that ECDSA signatures—the cryptographic backbone protecting most Bitcoin transactions—could be vulnerable to quantum attacks. This exposes roughly 6.51 million BTC (representing 32.7% of total supply) held in reused addresses and legacy outputs, making migration to post-quantum cryptographic standards urgent. Industry analysts recommend completing the transition to quantum-resistant protocols by 2035 to safeguard long-term network integrity. The timeline is tight, but feasible—Bitcoin developers and the broader crypto community need to prioritize post-quantum crypto adoption now rather than wait for quantum threats to materialize.