Could quantum computers become one of the biggest challenges to blockchain security in the future ? It’s a question worth taking seriously, even if large-scale, fault-tolerant quantum computers are not yet capable of breaking today’s blockchain cryptography at scale. Most blockchains rely on cryptographic systems that could face different levels of risk as quantum computing advances. Digital signatures, wallet security, and the ability to verify ownership are particularly important areas to consider. This is where @StarkWareLtd and @Starknet stand out in the conversation. Starknet uses STARK proofs, which rely on hash functions and other cryptographic assumptions rather than the elliptic-curve discrete logarithm problem used by many conventional blockchain signature schemes. This gives STARK-based proving an important advantage when considering potential quantum threats. However, there is an important distinction between having quantum-resistant proof technology and having an entirely quantum-resistant blockchain. Wallet signatures, account authentication, and other cryptographic components must also be evaluated and upgraded where necessary. Protecting one layer does not automatically secure the entire system. That is why preparing early matters. Quantum security should not be treated as a problem to solve only when the threat becomes immediate. The real question is whether blockchain infrastructure can evolve before quantum computing becomes a practical threat. Starknet's use of STARK proofs is a meaningful part of that conversation, but the long-term goal must be comprehensive security across the entire ecosystem. The future of blockchain security will depend not only on scaling transactions today, but also on building systems that can withstand the cryptographic challenges of tomorrow.