Here’s how COTI’s dual privacy engine works and what it matters:

With the announcement of COTI Nightfall, COTI became the first protocol to offer a dual-mainnet privacy stack: high-performance Garbled Circuits (GC) and enterprise-grade ZK Roll-Up technology. All unified by a single token and ecosystem.

This isn’t about choosing sides. It’s about giving every builder, enterprise, and institution the right privacy primitive for the right use case to meet their needs, as well as to meet the global demand for privacy, scalability and compliance.

This post breaks down what each technology does, where each excels, and how they complement each other to power the next generation of private enterprise and applications in the COTI.

Why Two Privacy Protocols?

Privacy should be purpose-built, programmable, and not a one size fits all approach. Different applications, use cases and organizations have different requirements and needs when it comes to privacy, compliance, and scalability.

For example, a regulated fund tokenizing billions in real-world assets on Ethereum, needs compliance workflows, KYC-gating, and auditability. However, a high-frequency DEX protecting traders from front-running needs highly-scalable private trading with raw speed, low latency and low costs.

At COTI, we’re becoming the All-in-One privacy protocol, designed to offer the optimal privacy path and blockchain destination for enterprises and builders,

Garbled Circuits (GC): Fast, Light, Scalable

Garbled Circuits are a cryptographic protocol for secure multi-party computation (MPC). The concept has existed since the 1980s, but COTI is the first to bring a full GC implementation to a live blockchain.

GC enables smart contracts to operate on encrypted inputs without exposing the underlying data. Multiple parties can execute logic together, each keeping their inputs private, while the contract enforces correctness. The result is never revealed to anyone who shouldn’t see it.

Performance profile:

  • Up to 3,000x faster computation than FHE alternatives

  • 250x lighter in computational demand

  • Fully EVM-compatible via COTI’s gcEVM

  • Native 128-bit and 256-bit arithmetic (enabled by the Helium upgrade)

  • Runs on any device, including mobile, with no specialized hardware required

What runs on COTI GC today:

  • Private DeFi: Confidential trading, private arbitrage execution (live on Bancor’s Arb Fast Lane), and sealed-bid auctions.

  • Healthcare Supply Chains: Over 10-million+ private on-chain transactions powering VaccineLedger’s cold chain monitoring in Bangladesh

  • Private Hardware Wallets: United Network’s card-based wallet with COTI’s privacy layer for confidential transactions

  • Private Tokens and Encrypted Messaging: Accessible through the COTI MetaMask Snap and community-built tools like CipherTrade

  • AI and Identity: Programmable privacy for the next generation of decentralized applications

GC is optimized for speed and versatility. No matter the complexity of the use case, COTI private multi-party computation can support it. Built for builders and applications that need fast, low-cost confidential computation at scale.

COTI Nightfall ZK: Enterprise-Grade Flows

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 (Nightfall_4) that delivers near-instant finality and improved performance. EY continues to actively support the protocol’s evolution.

COTI Nightfall brings this proven ZK infrastructure into the COTI ecosystem as a dedicated Ethereum-based ZK Roll-up, purpose-built for regulated environments and institutional workflows.

Key capabilities:

  • Private transfers across multiple token standards: ERC-20, ERC-721, ERC-1155, and ERC-3525

  • Efficient ZK Roll-ups with near-instant finality

  • Decentralized permissioning and KYC-gating for regulated environments

  • Digital identity protocols

  • Confidential smart contracts with end-to-end encryption

  • Selective disclosure and multichain composability

Nightfall is built for the use cases where compliance is the starting point, not an afterthought. Tokenized real-world assets, regulated payments, institutional DeFi, and enterprise asset classes that require built-in KYC/AML workflows and auditability at every layer.

Side by Side: COTI GC + Nightfall ZK

Understanding where each technology fits is straightforward.

How They Work Together

The dual-privacy stack isn’t two separate products competing for attention. It’s a unified architecture where each technology handles the use cases it’s best suited for. Properly equipping COTI to onboard the millions of enterprises, organizations and builders across the Globe who want to access the benefits of blockchain and global liquidity, but need privacy to do it.

The speed, low cost, and multi-party computation capabilities make GC the natural fit for high-performance privacy demands and the programmability needed for builders. For regulated enterprises and institutions with strict compliance needs, built-in KYC/AML gating, identity protocols, and selective disclosure for regulators, COTI Nightfall ZK will be the right choice.

The point is simple: enterprises, builders, and institutions no longer need to compromise. The right privacy primitive is always available.

The All-in-One Privacy Protocol

With Nightfall joining the ecosystem, COTI is evolving from a single-chain privacy solution into a multi-chain privacy protocol with three distinct paths:

  • COTI GC on our native network for fast, scalable confidential computation

  • COTI Nightfall ZK for enterprise-grade compliance and institutional workflows

  • Privacy-on-Demand bringing Garbled Circuits to leading L1 and L2 chains, starting with Ethereum

Privacy-on-Demand alone opens 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. Every enterprise, every builder, every use case now has a privacy path on COTI that fits.

One Token. Unified Utility.

The COTI token will be native to COTI Nightfall ZK mainnet, just as it is for our COTI GC network. This expands the horizon of demand and utility for the token, with protocol fees, staking, gas, and governance now flowing 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’s Next

COTI Nightfall is scheduled to launch on testnet in the near future, with mainnet deployment planned for later in 2026. Meanwhile, the GC-powered mainnet continues to grow, having just hit over 110-million+ on-chain transactions and wallets continuing to grow month-over-month.

With Garbled Circuits and ZK now under one roof, COTI is positioned as the all-in-one privacy protocol and a privacy leader of Web3.

Purpose-fit privacy for every enterprise, institution, and builder. This is just the beginning.

Stay COTI. 🚀

About COTI

COTI is the programmable privacy layer for Web3. Built for enterprises, builders, and agents. Powered by high-performance Garbled Circuits and enterprise-grade COTI Nightfall (ZK), COTI enables encrypted computation on any public blockchain. Fast, low-cost, and compliant privacy across DeFi, AI, and beyond.

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

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