Key Takeaways
COTI is a privacy-focused layer 2 network on Ethereum that enables confidential transactions and private computation in smart contracts using a technology called Garbled Circuits.
The network is transitioning from its original DAG-based Trustchain architecture (V1) to a privacy-centric Ethereum L2 (V2), with the V1 network scheduled to be fully sunset by the end of Q3 2026.
Core privacy features include 256-bit encrypted ERC-20 tokens, private NFTs, and a MetaMask Snap that allows users to interact with COTI's privacy layer from a familiar wallet interface. A planned ZK rollup called COTI Nightfall targets enterprise-grade privacy with regulatory compliance.
The COTI ecosystem includes the PriveX privacy-focused decentralized exchange, which processed approximately $8 billion in trading volume in a recent month, and oracle integrations with Band Protocol for ADA and USDT price feeds in private DeFi applications.
What Is COTI?
COTI is a privacy-focused blockchain network that operates as an Ethereum layer-2 scaling solution. Its core technology, known as Garbled Circuits, enables confidential transactions and private computation within smart contracts, allowing applications to process sensitive data without exposing it on the public blockchain.
The project was originally launched as a directed acyclic graph-based network called Trustchain, designed primarily for payments and merchant solutions. In 2024, COTI underwent a strategic pivot to become a privacy infrastructure provider on Ethereum, launching its V2 mainnet with the Garbled Circuits privacy engine at its center. The original V1 Trustchain is scheduled to be fully sunset by the end of Q3 2026, consolidating the entire ecosystem on the new Ethereum L2 architecture.
How Does COTI Work?
COTI achieves programmable privacy through Garbled Circuits, a form of secure multi-party computation derived from cryptographic research originally proposed by Andrew Yao. In simple terms, Garbled Circuits allow two or more parties to jointly compute a function over their private inputs without revealing those inputs to each other. On COTI, this means that smart contracts can execute logic using encrypted data, such as private token balances or hidden transaction amounts, while the results are settled and verified on Ethereum.
For developers, COTI provides a privacy stack that includes the 256-bit encrypted ERC-20 token standard, which keeps token balances and transfer amounts confidential, and support for private NFTs where ownership and metadata can remain hidden.ย
The MetaMask Snap Privacy Suite, updated in May 2026, allows users to interact with these privacy features directly from the MetaMask wallet, reducing the friction of adopting privacy-first applications.
The network's Helium protocol upgrade, deployed in January 2026, added native support for 128-bit and 256-bit computation, enabling more complex private financial logic and high-precision calculations within encrypted smart contracts.ย
This is particularly relevant for decentralized finance applications that require hidden collateral ratios, sealed-bid auctions, or confidential trading parameters.
The COTI Token (COTI)
COTI is the native utility token of the network with a maximum supply of 4.91 billion tokens, of which approximately 2.25 billion were in circulation as of May 2026. The token is used to pay for transaction fees on the network, to participate in staking, and as a governance token for protocol decisions.ย
With the transition to V2, the token's utility has shifted from its original payments-oriented role to supporting the privacy infrastructure and L2 ecosystem. Holders of COTI on major exchanges or as ERC-20 tokens on Ethereum are not required to take any action for the V1 sunset, though users with native COTI on legacy wallets such as VIPER should migrate before the Q3 2026 deadline.
Ecosystem and Adoption
The COTI ecosystem includes several applications and integrations that demonstrate the practical use of its privacy technology. PriveX, a privacy-focused decentralized exchange built on COTI, processed approximately $8 billion in trading volume in a recent month and ranked among the top perpetual DEX platforms by volume globally.ย
In April 2026, COTI integrated Band Protocol oracles to provide ADA and USDT price feeds for privacy-focused DeFi applications, expanding the available financial primitives that can operate within encrypted environments.
On the enterprise side, COTI has explored central bank digital currency applications and is targeting the intersection of privacy and tokenized real-world assets as a core growth area for 2026. The planned COTI Nightfall ZK rollup aims to combine zero-knowledge proofs with COTI's existing privacy technology to create a compliance-ready privacy solution for institutions, while the broader multichain Privacy-on-Demand vision seeks to extend Garbled Circuits functionality to other blockchain networks beyond Ethereum.
COTI v2 Roadmap
Looking ahead, COTI's roadmap centers on completing the V1 sunset by the end of Q3 2026, after which the network will be fully consolidated on V2. The COTI Nightfall ZK rollup is expected to launch during 2026, providing an enterprise-grade privacy layer with regulatory compliance and auditability features that distinguish it from fully anonymous protocols. The multichain Privacy-on-Demand initiative aims to make COTI's privacy infrastructure available as a pluggable service for decentralized applications on other chains, similar to how oracle networks provide data feeds.
FAQ
What is COTI used for?
COTI provides privacy infrastructure for blockchain applications. Its main use cases include confidential DeFi transactions, private token transfers using 256-bit encrypted ERC-20 tokens, private NFTs where ownership and metadata remain hidden, and enterprise applications such as private real-world asset tokenization. The PriveX DEX also demonstrates use of COTI's privacy layer for decentralized trading.
How does COTI differ from other privacy coins?
Unlike privacy coins such as Monero or Zcash that focus on anonymous payments at the protocol level, COTI operates as a privacy layer on Ethereum that developers can integrate into their existing applications. Rather than being a standalone cryptocurrency for private transactions, COTI provides tools that any smart contract can use to selectively add privacy features, while still settling on Ethereum and remaining within a regulated compliance framework where required.
What are Garbled Circuits?
Garbled Circuits are a cryptographic technique that allows multiple parties to compute a function together without revealing their individual inputs to each other. First proposed by computer scientist Andrew Yao in the 1980s, the technique has been adapted by COTI to enable privacy-preserving smart contracts on Ethereum, where computations can be performed on encrypted data such as private balances or hidden transaction parameters, with the results verified on-chain.
Do I need to migrate my COTI tokens?
If your COTI tokens are held on a major centralized exchange or as ERC-20 tokens on Ethereum, you typically do not need to take any action for the V1 sunset. Users holding native COTI or gCOTI on legacy wallets such as VIPER or Ledger should follow official COTI migration guidance before the V1 sunset deadline at the end of Q3 2026 to avoid any potential issues. Always verify migration instructions through official COTI channels.
What is COTI Nightfall?
COTI Nightfall is a planned zero-knowledge rollup on Ethereum designed for enterprise use. It combines zero-knowledge proofs with COTI's Garbled Circuits technology to offer a privacy solution that aims to be both confidential and regulatory-compliant. This distinguishes it from purely anonymous protocols, as it is intended to support features such as selective disclosure and audit trails for institutional users.
Closing Thoughts
COTI's evolution from a payments-focused DAG network to a privacy infrastructure layer on Ethereum reflects a broader trend in the blockchain industry toward specialized, interoperable infrastructure.ย
The Garbled Circuits approach to programmable privacy offers a different trade-off from zero-knowledge proofs, targeting use cases where selective confidentiality is needed within otherwise transparent smart contract environments.ย
The success of the V2 transition, the pace of developer adoption, and the delivery of planned products such as COTI Nightfall will likely determine whether COTI's privacy model gains meaningful traction in an increasingly competitive landscape of Ethereum-based privacy solutions.
Further Reading
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