TL;DR
COTI is launching COTI Nightfall, an enterprise-grade Zero-Knowledge (ZK) Roll-up for privacy.
It will operate as a dual-mainnet stack alongside COTI’s existing Garbled Circuits (GC) mainnet.
GC is for speed and low cost, while Nightfall ZK is for regulated, institutional use cases, with built-in KYC/AML features.
The Nightfall ZK technology was originally built by Ernst & Young (EY).
Both chains are powered by the COTI token for unified utility.
The testnet is coming soon, and the mainnet is planned for later in 2026.
More networks. More utility. More demand.
Meet COTI Nightfall
Today, COTI announces the launch of COTI Nightfall — an Ethereum Zero-Knowledge (ZK) Roll-up joining the COTI ecosystem. This milestone is a bold step forward in our mission to become the all-in-one privacy protocol, delivering purpose-fit privacy solutions for enterprises, institutions, and builders.
Here is everything you need to know 👇
EY & The Origins of Nightfall
Nightfall is an open-source zero-knowledge privacy protocol originally built by Ernst & Young (EY) in 2019 and released to the public domain. It has evolved through significant upgrades — including a 2025 transition to a full ZK Roll-up architecture that delivers near-instant finality and improved performance.
EY is one of the Big Four professional services firms (alongside Deloitte, PwC, and KPMG). Operating as a global network under Ernst & Young Global Limited, EY serves enterprise clients across nearly every major industry — with services spanning assurance, consulting, tax, strategy, and transactions in more than 150 countries.
What is Nightfall?
Nightfall enables confidential transactions on Ethereum and Ethereum-compatible networks while preserving the transparency, immutability, and security that enterprises require.
Its latest iteration, Nightfall 4, leverages ZK technology to support private transfers across multiple token standards, including 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 and compliance environments.
The protocol has come a long way since 2019. With six years of iteration and improvements, it’s now coming to COTI.
A Dual-Mainnet Privacy Stack
COTI Nightfall is a purpose-built ZK solution for enterprises launching alongside COTI’s existing high-performance Garbled Circuits (GC) mainnet. We’re not replacing anything, we’re adding serious firepower to our privacy ecosystem.
The result: a dual-mainnet privacy stack. GC for fast, low-cost, scalable applications. Nightfall ZK for enterprise-grade compliance and institutional workflows. Two proven technologies, one ecosystem.
The right privacy primitive for the right use case.
COTI GC Mainnet
The fastest, lightest, and most cost-effective privacy chain in Web3
Up to 3,000x faster and 250x lighter than alternatives
Built for DeFi, payments, identity, AI, and builder-led applications
COTI Nightfall ZK
Enterprise-grade, compliance-ready privacy for institutional workflows
Built-in KYC/AML gating and decentralized permissioning
Built for tokenized RWAs, private DeFi, regulated payments, and institutional asset classes
Together, these offer every enterprise, builder, and user a fully customizable privacy solution.
One Token. Two Blockchains.
The COTI token will be native to both the existing GC-mainnet and the COTI Nightfall ZK mainnet. Both chains are powered by a single COTI token, ensuring unified utility across fees, staking, governance, and privacy services, without supply dilution.
The token will be bridged 1:1 across chains. The maximum supply cap remains fixed, and no new tokens will be minted.
What does change is utility. Protocol fees, staking, gas, and governance now flow across two networks instead of one. Whether a builder chooses COTI GC or COTI Nightfall ZK, value flows back to the same ecosystem and the same token.
More networks. More utility. More demand.
What COTI Nightfall Enables
COTI Nightfall opens up a new class of enterprise use cases and partnerships that demand compliance-ready privacy infrastructure:
Confidential smart contracts with end-to-end encryption
Selective disclosure for regulatory compliance
Multichain composability across Ethereum-compatible networks
Private transfers of ERC-20, ERC-721, ERC-1155, and ERC-3525 token standards
Decentralized permissioning and KYC-gating for regulated environments
The timing matters. Demand for compliant privacy infrastructure is accelerating across tokenized real-world assets (RWAs), private DeFi, and regulated payments. COTI intends to capture that demand by being the all-in-one privacy protocol.
The All-in-One Privacy Protocol
COTI is evolving from a single-chain privacy solution into something much bigger — a multi-chain privacy protocol with three distinct paths:
COTI GC: Our native network for fast, scalable confidential computation for enterprises, builders, agents and users.
Privacy-on-Demand: Deploying Garbled Circuits powered-privacy to leading L1 and L2 chains, starting with Ethereum.
COTI Nightfall ZK: For enterprises who need institutional-grade compliance and institutional workflows, and
For every enterprise, every builder, every use case, there’s now a privacy path on COTI that fits. With Privacy-on-Demand we will open the door for thousands of apps and dApps on other chains to leverage COTI’s GC for private computation and transactions, all powered by the COTI token.
COTI remains fully committed to scaling enterprises, projects and builders on our GC-powered mainnet. COTI Nightfall expands the mission, and we’re committed to making COTI the full-suite privacy solution.
What the Leaders Are Saying
“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
What’s Next
COTI Nightfall is scheduled to launch on testnet in the near future, with mainnet deployment planned for later in 2026.
This major milestone and launch supports COTI’s 2026 strategic vision to take privacy mainstream. With Garbled Circuits and ZK now under one roof, multichain Privacy-on-Demand coming soon, COTI is now the all-in-one privacy protocol for Web3.
Purpose-built privacy for every enterprise, institution, and builder. Multiple chains. All powered by the COTI token. Privacy for every use case.
Stay COTI.
About COTI:
COTI is the programmable privacy layer for Web3. Powered by high-performance Garbled Circuits (GC), COTI enables encrypted computation on public blockchains — delivering fast, low-cost, and compliant privacy for DeFi, payments, identity, governance, and AI applications.
For COTI updates and to join the conversation, be sure to check out our channels:
Website: https://coti.io/
X: https://twitter.com/COTInetwork
YouTube: https://www.youtube.com/channel/UCl-2YzhaPnouvBtotKuM4DA
Telegram: https://t.me/COTInetwork
Discord: https://discord.gg/9tq6CP6XrT
GitHub: https://github.com/coti-io