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Austin, United States, March 26th, 2026, ChainwireCOTI, the programmable privacy layer for Web3, today announces the launch of COTI Nightfall, an Ethereum ZK Rollup, within its expanding enterprise privacy ecosystem.
Nightfall, an open-source zero-knowledge privacy layer originally built by Ernst & Young (EY) in 2019 and released to the public domain, has evolved through significant upgrades —including its 2025 transition to a full Zero-Knowledge (ZK) roll-up architecture for near-instant finality and improved performance.
COTI Nightfall is due to launch on testnet in the coming weeks, with mainnet deployment planned for later in 2026. This deployment marks a key milestone in COTI’s mission to deliver purpose-fit privacy solutions for enterprises, institutions, and builders across any blockchain.
Nightfall enables confidential transactions on Ethereum and Ethereum-compatible networks while maintaining transparency, immutability, and security. Its latest iteration (Nightfall_4) leverages ZK technology to support private transfers of multiple token standards (ERC-20, ERC-721, ERC-1155, ERC-3525), bundled into efficient ZK roll-ups. It also features decentralized permissioning and KYC-gating capabilities designed for regulated environments.
COTI Nightfall is a purpose-built ZK solution launching alongside COTI’s existing high-performance Garbled Circuits (GC) mainnet. This will create a dual-mainnet privacy stack: GC for fast, low-cost, scalable applications and COTI Nightfall ZK for enterprise-grade compliance and institutional workflows. All powered by a single COTI token, ensuring unified utility across fees, staking, governance, and privacy services without supply dilution.
COTI Nightfall will allow enterprises and developers to explore confidential smart contracts, end-to-end encryption, selective disclosure, and multichain composability. This aligns with growing demand for compliant privacy infrastructure in tokenized real-world assets (RWAs), private DeFi, and regulated payments.
“With the launch of COTI Nightfall, we’re advancing the evolution of privacy infrastructure by launching proven ZK technology alongside our industry-leading Garbled Circuits. This dual-mainnet approach delivers the ultimate in programmable privacy, empowering enterprises and builders worldwide to embed true confidentiality into any use case.” – Shahaf Bar-Geffen, CEO of COTI.
“We are really pleased to be working with COTI. Adding the Ethereum Mainnet to the set of networks where Nightfall is available is a huge positive step, and COTI already understands the importance of building infrastructure for privacy for enterprise users.” – Clare Adelgren, EY Global Interim Blockchain Leader.
COTI’s deployment of Nightfall supports its 2026 strategic vision to take privacy mainstream, delivering multichain Privacy-on-Demand. With Nightfall joining the COTI ecosystem, COTI will work alongside leading partners to on-board enterprises into a trusted, open-source ZK solution with broader access to the Ethereum and crypto ecosystem.
About COTI
COTI is the programmable privacy layer for Web3. Powered by high-performance Garbled Circuits, COTI brings fast, low-cost, flexible, and compliant privacy to any blockchain. With privacy that’s programmable by design, COTI enables the next generation of DeFi, payments, identity, governance, and AI. Users can learn more at coti.io.
About Nightfall
Nightfall is a public domain-based privacy protocol that helps enable private transactions on Ethereum-compatible blockchains while preserving transparency, data immutability, and security. The technology uses Zero-Knowledge Proof rollups to bundle private transactions efficiently while maintaining near-instant finality without challenge periods.
About EY
EY is building a better working world by creating new value for clients, people, society and the planet, while building trust in capital markets.
Enabled by data, AI and advanced technology, EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow.
EY teams work across a full spectrum of services in assurance, consulting, tax, strategy and transactions. Fueled by sector insights, a globally connected, multi-disciplinary network and diverse ecosystem partners, EY teams can provide services in more than 150 countries and territories.
All in to shape the future with confidence.
EY refers to the global organization, and may refer to one or more, of the member firms of Ernst & Young Global Limited, each of which is a separate legal entity. Ernst & Young Global Limited, a UK company limited by guarantee, does not provide services to clients. Information about how EY collects and uses personal data and a description of the rights individuals have under data protection legislation are available via ey.com/privacy. EY member firms do not practice law where prohibited by local laws. For more information about our organization, users can visit ey.com.