zkSync (ZKsync) and Zero-knowledge proofs (ZKPs)

zkSync and zero-knowledge proofs (ZKPs) together represent one of the most critical scaling and privacy breakthroughs in blockchain infrastructure.

ZKPs are cryptographic methods that allow verification of correctness without revealing underlying data, while zkSync is one of the leading layer-2 networks operationalizing this technology at production scale on Ethereum. 

In 2025, they stand out for transforming zero-knowledge cryptography from theoretical promise into high-throughput, economically viable blockchain infrastructure.

Origin and Background

zkSync, developed by Matter Labs, launched initially as a payment-focused zk-rollup and evolved into zkSync Era, a full smart-contract layer-2 supporting Solidity-compatible applications. By bundling thousands of transactions into single cryptographic proofs submitted to Ethereum, zkSync demonstrates how ZKPs enable both scalability and security while preserving decentralization.

Zero-knowledge proofs were introduced in academic cryptography in the 1980s and later applied in blockchain through zk-SNARKs, most notably by privacy-focused networks such as Zcash. Over time, more scalable variants like zk-STARKs and recursive proofs enabled real-world transaction batching and fast verification.

Key Highlights

• Atlas upgrade pushed ZK rollup performance to new levels: zkSync deployed its Atlas upgrade in late 2025, re-architecting its ZK Stack to exceed 15,000 transactions per second with near-zero fees and faster finality, setting new performance benchmarks for Ethereum layer-2 networks.
• ZK rollups became the dominant layer-2 scaling model on Ethereum: In 2025, ZK-based rollups processed the majority of layer-2 transaction volume, confirming zero-knowledge proofs as Ethereum’s primary scalability path rather than an experimental alternative.
• Enterprise-grade infrastructure launches: In late 2025, matter labs began promoting ZKsync Managed Services, enabling enterprises to deploy production-grade ZK Stack chains without operational overhead, a significant step toward institutional adoption.
• Retirement of ZKsync Lite announced: ZKsync publicly announced in December 2025 that it will sunset support for its first Ethereum rollup (ZKsync Lite) in 2026, marking a clear shift in focus to more advanced ZK Stack and Era architectures.
• Technology shifts from theory to infrastructure: In 2025, zero-knowledge proofs moved from cryptographic research into critical blockchain infrastructure, powering scalability, privacy and compliance systems across major networks.
• ZK rollups dominate layer-2 activity: Across Ethereum and related ecosystems, ZK-based rollups processed the majority of layer-2 transactions in 2025, highlighting the real-world adoption of ZKP tech at scale.
• Cost and performance gains accelerate adoption: ZK rollup networks achieved performance leaps (some implementations reported up to 43,000 TPS in experimental setups), with transaction costs dropping sharply, making them competitive with or better than traditional blockchain layers for high-throughput applications.

Impact on the Industry (2025)

In 2025, ZKPs became foundational to Ethereum’s modular scaling strategy, while zkSync emerged as one of the clearest demonstrations of ZK technology in live production. 

Together, they reshaped expectations for blockchain performance, privacy, and composability, influencing how new protocols design execution, data availability, and settlement layers.

Looking Ahead (2026 and Beyond)

Going forward, zkSync and ZKPs are positioned at the center of modular blockchains, real-world asset tokenization, privacy-preserving compliance, and AI-verifiable computation. 

As proof systems become faster and cheaper, ZK technology is expected to expand beyond crypto into identity, finance, and enterprise verification systems, making zkSync not just a scaling solution, but a gateway to broader cryptographic adoption across digital infrastructure.