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About
Zama is an open source cryptography protocol that brings Fully Homomorphic Encryption (FHE) to blockchain, solving one of its most fundamental limitations: public transparency of all onchain data. The Zama Confidential Blockchain Protocol acts as a confidentiality layer that can be deployed on top of any existing L1 or L2, enabling smart contracts to process encrypted data without ever exposing it — even to validators. At its core, Zama uses FHE coprocessors to offload heavy cryptographic computation from the base chain, keeping gas fees manageable while enabling horizontal scalability and maintaining public verifiability. The protocol currently supports 20 transactions per second per chain — enough to handle all of Ethereum's current load — with a roadmap to 1,000+ TPS and eventual 10,000+ TPS via dedicated FHE ASICs developed in partnership with hardware manufacturers. For developers, Zama requires no new language: smart contracts are written in standard Solidity using special `euint` encrypted data types that mark which contract state should remain private. Programmable compliance rules can be baked directly into contracts, specifying exactly who can decrypt what and under which conditions. Key use cases include confidential DeFi (private token swaps, lending, yield farming), encrypted stablecoin payments, sealed-bid auctions free from front-running, confidential token launches and airdrops, and compliant Real World Asset (RWA) tokenization for institutional adoption. Zama also offers enterprise-grade support, training, and dedicated resources for businesses building on the protocol.
Key Features
- FHE-Powered Confidential Smart Contracts: Keeps onchain data encrypted at all times — including during computation — so validators can verify state without ever seeing plaintext values.
- Chain-Agnostic Protocol: Deploys as a confidentiality layer on top of any existing L1 or L2 blockchain without requiring changes to the underlying chain.
- Solidity-Native Developer Experience: Developers use standard Solidity with `euint` encrypted data types, compatible with existing Solidity toolchains — no new language to learn.
- Programmable Compliance: Define granular decryption rules directly in smart contract logic, enabling compliant confidentiality for regulated industries like DeFi and RWA.
- Scalable FHE Coprocessors: Offloads FHE computation from the base chain via coprocessors, reducing gas costs while enabling horizontal scalability toward 1,000+ TPS.
Use Cases
- Confidential DeFi protocols enabling private token swaps, encrypted lending positions, and yield farming without exposing user balances or trade sizes.
- Sealed-bid onchain auctions where bids remain encrypted until resolution, eliminating front-running and ensuring fair price discovery.
- Compliant Real World Asset (RWA) tokenization allowing institutional-grade confidentiality while still satisfying regulatory requirements via programmable decryption rules.
- Private stablecoin payment systems where transaction amounts and counterparties are encrypted on-chain but verifiable by authorized parties.
- Confidential governance and token vesting schemes where voting weights and allocation schedules remain private until execution.
Pros
- Fully Open Source: Core cryptographic libraries and protocol are open source, enabling community audits, contributions, and transparent security validation.
- No New Languages Required: Solidity developers can adopt FHE with minimal friction by simply using encrypted data types in their existing smart contract workflows.
- Broad Blockchain Compatibility: Works with any L1 or L2, making it broadly applicable across the blockchain ecosystem without vendor lock-in.
- Practical Performance: Already capable of matching Ethereum's current throughput with a clear hardware roadmap to 10,000+ TPS via FHE ASICs.
Cons
- FHE Computational Overhead: Despite coprocessor offloading, FHE remains more computationally intensive than plaintext processing, which may affect latency-sensitive applications.
- Emerging Ecosystem: The tooling, developer community, and integration ecosystem are still maturing compared to mainstream smart contract development frameworks.
- Blockchain-Specific Scope: Zama's FHE solution is primarily focused on blockchain use cases and may not be the right fit for off-chain privacy-preserving computation needs.
Frequently Asked Questions
What is Fully Homomorphic Encryption (FHE)?
FHE is a form of encryption that allows computations to be performed directly on encrypted data without ever decrypting it. The result, when decrypted, is identical to what you would get by performing the same operation on plaintext — enabling true end-to-end data confidentiality.
How does Zama integrate with existing blockchains?
Zama operates as a confidentiality layer (coprocessor) that sits on top of any existing L1 or L2 blockchain. It offloads FHE computation from the base chain while maintaining public verifiability, so the underlying chain does not need to be modified.
Is Zama open source?
Yes. Zama is an open source cryptography company. Its FHE libraries, protocol code, and developer tooling are publicly available on GitHub, allowing anyone to audit, contribute to, or build on the protocol.
What blockchain use cases does Zama enable?
Zama enables confidential DeFi (private swaps, lending, yield farming), encrypted stablecoin payments, sealed-bid auctions, confidential token launches and governance, onchain self-custodial banking, and compliant Real World Asset tokenization.
How do developers build applications with Zama?
Developers write standard Solidity smart contracts using Zama's `euint` encrypted integer data types and TFHE library functions to mark data as private and define operations on encrypted values. The contracts are compiled and deployed using familiar Solidity toolchains, with no new programming language required.
