Zero-Knowledge Proof (ZKP) technology has transitioned from theoretical mathematics to a foundational blockchain infrastructure in 2026, solving critical privacy and scalability limitations. While zk-SNARKs offer compact proofs but require a trusted setup, zk-STARKs provide quantum resistance without setup parameters. Major institutions like Visa and BlackRock are deploying ZK solutions for private transactions and compliance, even as developers navigate regulatory scrutiny following the 2022 OFAC sanctions on Tornado Cash.
Zero-knowledge proof fundamentals
- ▪Zero-Knowledge Proofs (ZKPs) are cryptographic protocols that allow one party to verify the truth of a statement without revealing any underlying data.
- ▪The concept of Zero-Knowledge Proofs was first introduced in 1985 by Shafi Goldwasser, Silvio Micali, and Charles Rackoff.
- ▪Every zero-knowledge proof system must satisfy three fundamental properties: completeness, soundness, and zero-knowledge.
zk-SNARKs versus zk-STARKs
- ▪zk-SNARKs require a trusted setup phase to generate initial parameters securely, which introduces a single point of failure if compromised.
- ▪zk-SNARKs offer small proof sizes of approximately 200 to 300 bytes and fast, constant verification times regardless of computation complexity.
- ▪zk-STARKs, invented by Dr. Eli Ben-Sasson, eliminate the trusted setup requirement and are quantum-resistant, but produce larger proof sizes of around 45KB.
ZK rollup scalability solutions
- ▪According to 2025 benchmarks, zkSync Era processes approximately 2,000 transactions per second, while Starknet handles 1,500 transactions per second.
- ▪The major ZK rollups use different architectures, with zkSync Era and Polygon zkEVM targeting Ethereum compatibility, while Starknet uses the Cairo language.
- ▪ZK rollups bundle transactions off-chain and provide mathematical proof of validity before posting them to the main chain, achieving up to 90% data compression.
Privacy-preserving blockchain applications
- ▪Visa conducted a May 2024 pilot of ZK-based auto-payments on Ethereum, which reduced transaction verification costs by 87%.
- ▪Alexey Pertsev, a developer for Tornado Cash, was convicted of money laundering facilitation by a Dutch court in May 2024.
- ▪In August 2022, the U.S. Treasury's Office of Foreign Assets Control sanctioned Tornado Cash, an Ethereum-based mixer utilizing ZK proofs.
- ▪BlackRock's BUIDL Fund used ZK verification to perform investor accreditation checks for $240 million in tokenized US treasuries on Ethereum.
Midnight data-protection blockchain
- ▪Midnight utilizes a dedicated smart-contract language called Compact, which is purpose-built for native privacy and selective disclosure features.
- ▪Midnight is a Layer 1 data-protection blockchain within the Cardano ecosystem designed for building privacy-preserving applications.
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