--- description: This guide explain in detail everything about ZK-STARK (Zero-Knowledge Scalable Transparent ARgument of Knowledge) title: ZK-STARK - UPay Blog --- [Skip to content](#content) # ZK-STARK A ZK-STARK (Zero-Knowledge Scalable Transparent ARgument of Knowledge) is a cryptographic proof system that allows one party to prove possession of secret information or the correctness of a computation to another party — without revealing the secret and without requiring a trusted setup ceremony. Developed by Eli Ben-Sasson and StarkWare Industries, STARKs achieve transparency (no trusted setup), quantum resistance (relying only on [hash functions](https://blog.upay.com/crypto-terminology/hash-function/)), and scalability (proof verification time is poly-logarithmic in computation size). While zk-SNARKs produce smaller proofs, zk-STARKs offer stronger cryptographic assumptions and are the foundation of StarkWare’s Ethereum scaling technology (StarkEx and StarkNet).  Origin & History | **Date** | **Event** | | --- | --- | | **1985** | Foundational zero-knowledge proof theory (Goldwasser, Micali & Rackoff) | | **2012** | zk-SNARKs formalised; require trusted setup — a limitation | | **2018** | Ben-Sasson et al. publish “Scalable, transparent, and post-quantum secure computational integrity” — introduces STARKs | | **2018** | StarkWare Industries founded by Ben-Sasson, Bentov, Horesh, Riabzev | | **2020** | StarkEx (StarkWare’s scalability engine) launches with dYdX and DeversiFi | | **2021** | StarkNet (decentralised L2) testnet launches on Ethereum | | **2022** | StarkNet mainnet alpha; Cairo programming language for STARK-provable programs | | **2023** | StarkNet processes millions of transactions monthly; STRK token announced | | **2024** | StarkWare releases recursive STARK research enabling proof composition | “STARKs are SNARKs’ bigger, [post-quantum](https://blog.upay.com/crypto-terminology/post-quantum-cryptography/)-safe cousin, they sacrifice proof size for transparency and security.” — Eli Ben-Sasson, StarkWare co-founder  How It Works  ZK-STARK vs ZK-SNARK COMPARISON ────────────────────────────────────────────────────────────────── SNARK              STARK ───────────────────────────────────────────────────────────── Trusted Setup:    Required (toxic waste)   NONE (transparent) Proof Size:       \~200 bytes               \~50–200 KB Verify Time:      Milliseconds             Milliseconds Quantum Safe:     No (elliptic curve)      Yes (hash functions only) Prover Time:      Fast                     Slower (larger constants) Used in:          Zcash, zkSync, Groth16   StarkNet, StarkEx ────────────────────────────────────────────────────────────────── STARK PROOF GENERATION: Computation → Algebraic Intermediate Representation (AIR) → Polynomial commitment (FRI protocol) → STARK proof (can be verified by anyone) → Ethereum L1 verifier checks proof in \~200k-500k gas | **Property** | **zk-SNARK** | **zk-STARK** | | --- | --- | --- | | **Setup** | Trusted ceremony | None (transparent) | | **Assumption** | Elliptic curves | Hash functions only | | **Quantum resistance** | No | Yes | | **Proof size** | \~200 bytes | \~50–200 KB | | **Verification gas (ETH)** | \~200K-300K gas | \~200K-500K gas | | **Scalability** | High | Very high |  In Simple Terms 1. **No trusted setup** – STARKs don’t require a secret ceremony to generate parameters. There is no “toxic waste” that must be destroyed; anyone can verify the randomness was fair. 2. **Quantum-safe** – STARKs rely only on collision-resistant hash functions, which quantum computers cannot break (unlike the elliptic curve math SNARKs use). 3. **Larger proofs, same security** – A STARK proof is much larger than a SNARK proof (50 KB vs. 200 bytes) but carries stronger security assumptions. 4. **Scales with computation** – STARK verification time grows poly-logarithmically with computation size — a 1 million-step computation’s proof isn’t 1 million times harder to verify. 5. **Cairo language** – StarkWare created Cairo, a language for writing STARK-provable programs, enabling complex smart contract logic to be proven on L2 and settled on Ethereum.  Real-World Examples | **Scenario** | **Implementation** | **Outcome** | | --- | --- | --- | | **dYdX v3 on StarkEx** | Perpetual futures settlement via STARK proofs | 1,000 TPS at Ethereum security; <$1 fees | | **Immutable X NFT minting** | StarkEx ZK-Rollup for gaming NFTs | 9,000 NFT mints/second; zero gas for users | | **StarkNet DeFi** | JediSwap, Ekubo DEX deploy on StarkNet | Full smart contract DeFi at 100× Ethereum speed | | **Cairo contracts** | Developer writes Cairo contract for on-chain game | Every move proven correct on-chain; no cheating possible | | **Recursive STARKs** | StarkWare proves proofs of proofs | Compress billions of transactions into one Ethereum TX |  Advantages | **Advantage** | **Detail** | | --- | --- | | **No trusted setup** | Eliminates “ceremony” security risk entirely | | **Quantum resistant** | Only crypto system provably safe against quantum computing | | **Transparent randomness** | All proof parameters publicly verifiable | | **Extreme scalability** | Recursive proofs can aggregate unbounded computation | | **Battle-tested math** | Relies on well-understood hash functions, not novel assumptions |  Disadvantages & Risks | **Risk** | **Detail** | | --- | --- | | **Proof size** | 50–200 KB proofs are expensive to post to Ethereum (calldata costs) | | **Verification gas cost** | \~200K-500K gas to verify a STARK vs \~200K-300K for a SNARK | | **Cairo learning curve** | Cairo language is different from Solidity; developer ecosystem smaller | | **Prover compute cost** | STARK generation requires significant compute resources | | **EVM compatibility** | Native StarkNet is not EVM-equivalent; Kakarot (EVM on Cairo) works around this | **Risk Management Tips:** - Monitor StarkNet’s decentralisation roadmap — prover centralisation is a current risk - For [EVM](https://blog.upay.com/crypto-terminology/evm-ethereum-virtual-machine/) developers, explore Kakarot (EVM on Cairo) for easier migration to StarkNet - Use L2Beat to track StarkNet’s security and upgrade key risks  FAQ **Q: What does “transparent” mean in ZK-STARK?** A: No secret parameters were generated. Anyone can independently verify that the proof system setup is fair — unlike SNARKs where a trusted ceremony’s integrity must be assumed. **Q: Why are STARK proofs larger than SNARK proofs?** A: SNARKs use elliptic curve pairing (compact but less safe assumptions); STARKs use [Merkle trees](https://blog.upay.com/crypto-terminology/merkle-tree/) and FRI polynomial commitments (inherently larger but more secure). **Q: Is StarkNet EVM-compatible?** A: Natively, StarkNet uses Cairo (not EVM). Kakarot is an EVM implementation written in Cairo, enabling Solidity contracts to run on StarkNet indirectly. **Q: Can STARKs scale to billions of transactions?** A: Recursive STARKs (proving proofs of proofs) theoretically scale to arbitrary computation. StarkWare’s Stwo prover targets proving millions of transactions per second. **Q: Who invented ZK-STARKs?** A: Eli Ben-Sasson (Technion professor and StarkWare co-founder) along with Iddo Bentov, Lior Horesh, and Michael Riabzev published the original STARK paper in 2018. Sources - Ben-Sasson et al., “Scalable, transparent, and post-quantum secure computational integrity” (2018) — IACR ePrint - StarkWare documentation — starkware.co - StarkNet documentation — docs.starknet.io - Vitalik Buterin, “STARKs, Part 1” — vitalik.ca  **UPay Tip:** STARKs’ quantum resistance makes them the longest-term safe choice for cryptographic proof systems as quantum computing advances. 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