Research from Google's Quantum AI team suggests that quantum computers could compromise the elliptic-curve cryptography used by Bitcoin, with fewer than 500,000 qubits needed by 2029. This poses a significant risk to cryptocurrencies, particularly Bitcoin and Ethereum, with potential vulnerabilities that could expose up to $100 billion in decentralized finance (DeFi) assets. As the threat becomes more tangible, tokens and protocols designed to resist quantum attacks have seen price increases of nearly 50%. The urgency for the crypto sector to adopt post-quantum cryptography is critical, as the timeline for mitigation is shorter than the implementation cycles of existing financial infrastructures. Despite these challenges, experts believe that quantum computing will not spell the end for cryptocurrencies but will necessitate a redesign of their security frameworks. The adaptability of blockchain technology, through protocol upgrades and cryptographic migrations, positions it favorably against traditional financial systems, turning the quantum threat into a development opportunity.