zk-SNARK and zk-STARK are two leading zero-knowledge proof technologies shaping the future of blockchain privacy and scalability. While zk-SNARKs are compact and widely adopted, they require a trusted setup and are vulnerable to quantum attacks. zk-STARKs, on the other hand, are transparent, scalable, and quantum-resistant, but come with larger proof sizes. This article explores their differences and which is more future-proof.