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  • Stuck on Zero Knowledge Proof? Interview Question!

    John Butler

    Member

    Updated: Mar 20, 2025
    Views: 2.2K

    Hey folks, ran into this blockchain interview question and wanted to get your take: What's the actual difference between zk-SNARKs and zk-STARKs?

    I know both are zero-knowledge proofs, but like… how do they really stack up in practice? For example, I’ve heard Zcash uses SNARKs, and STARKs are hyped in projects like StarkWare.

    But why pick one over the other? Is it about scalability, trust assumptions, or something else? Also, could someone give real-world examples where each shines (or flops)? Trying to wrap my head around the trade-offs beyond the jargon. Thanks!

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  • Lawrence Rogers

    Member • 1mo

    That’s a great question! Here’s how I’d break it down:

    Key differences:

    Scalability: zk-STARKs handle large computations better, while zk-SNARKs work well for smaller proof sizes. Security: zk-STARKs use hash functions, which makes them quantum-resistant. zk-SNARKs rely on elliptic curve cryptography and need a trusted setup. Transparency: zk-STARKs don’t require a trusted setup, so they remove centralization risks. zk-SNARKs need an initial ceremony, which some see as a drawback. Efficiency: zk-SNARKs generate smaller proofs, so they work well for on-chain verification. zk-STARKs produce larger proofs but scale better for complex applications. Real-world use cases:

    zk-SNARKs: Zcash uses them for private transactions. Polygon zkEVM leverages them for Layer 2 scalability. zk-STARKs: StarkNet and Immutable X use them for scalable and secure rollups. If an interviewer asks this, I’d focus on trade-offs. zk-SNARKs shine in efficiency, while zk-STARKs offer better scalability and security. Bringing up real-world examples always makes the answer stronger!

  • Sheza Henry

    Member • 2w

    Hey, great question! So, zk-SNARKs and zk-STARKs both let you prove something’s true without spilling secrets. But here’s the kicker: SNARKs need a "trusted setup" (imagine a secret handshake that, if leaked, breaks security). That’s why Zcash uses them—it’s efficient for private transactions, but that setup phase makes some folks nervous.

    STARKs, though? No trust needed. They’re like, “We’re good on our own, thanks.” Projects like StarkWare love this for scaling Ethereum (think rollups), and they’re quantum-resistant (future-proofing!). But there’s a catch: STARK proofs are bulkier and slower to generate.

    Why pick one? If you’re building something small and fast (like a privacy coin), SNARKs win. If you need ironclad trustlessness and don’t mind heavier proofs (big DeFi protocols, long-term systems), STARKs shine.

    Real talk: SNARKs are battle-tested, but STARKs feel like the “next gen.” I’ve seen teams waste months over-engineering for STARKs when SNARKs would’ve worked. Always ask: Does my project really need the extra security, or am I just chasing hype?

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