Ethereum Attestation Service
![License](https://img.shields.io/github/license/ethereum-attestation-service/eas-contracts?style=flat-square)
Introduction
The Ethereum Attestation Service is a free and open protocol for on-chain attestations on EVM compatible blockchains. It is a generalized service that allows anyone to register a schema for their particular use case, and then make attestations following their schema.
Schemas can be registered using the SchemaRegistry.sol
contract, and attestations are made using the EAS.sol
contract.
In addition, we provide a resolver contract for advanced use cases, such as on-chain verification of attestation data, and also attaching payments to attestations (which makes a new suite of powerful web3 applications possible).
We also provide an SDK for developers.
On-chain attestations will enable a powerful new range of web3 applications, including:
- Identity
- Trust Scores
- Goodness Scores
- Credit Scores
- Clout
- Land Registries
- Social Networks
- Portable Trust Layers
- Retroactive Public Goods Funding
- KYC Services
- Uncollateralized Lending / Borrowing
- Voting
- Oracles (who can be atomically paid for making attestations inside the protocol)
- Likes/Dislikes
- Content Filtering
- And many more!
Deployments
Please note that you can also import and use the addresses directly in your code using the @ethereum-attestation-service/eas-contracts/deployments
deployment artifacts corresponding to your desired network.
Mainnets
Ethereum
Version 0.26:
Optimism
Version 1.0.1:
Version 1.2.0:
Base
Version 1.0.1:
Version 1.2.0:
Arbitrum One
Version 0.26:
Arbitrum Nova
Version 1.3.0:
- EAS:
- SchemaRegistry:
- EIP712Proxy:
- Indexer:
Polygon
Version 1.3.0:
- EAS:
- SchemaRegistry:
- EIP712Proxy:
- Indexer:
Scroll
Version 1.3.0:
- EAS:
- SchemaRegistry:
- EIP712Proxy:
- Indexer:
zkSync
Version 1.3.0:
- EAS:
- SchemaRegistry:
- EIP712Proxy:
- Indexer:
Celo
Version 1.3.0:
- EAS:
- SchemaRegistry:
- EIP712Proxy:
- Indexer:
Blast
Version 1.3.0:
Linea
Version 1.2.0:
Testnets
Sepolia
Version 0.26:
Version 1.2.0:
Optimism Sepolia
Version 1.0.2:
Version 1.3.0:
Optimism Goerli
Version 1.0.1:
Version 1.2.0:
Base Sepolia
Version 1.2.0:
Version 1.3.0:
Base Goerli
Version 1.0.1:
Version 1.2.0:
Arbitrum Goerli
Version 1.1.0:
Polygon Amoy
Version 1.3.0:
- EAS:
- SchemaRegistry:
- EIP712Proxy:
- Indexer:
Scroll Sepolia
Version 1.3.0:
- EAS:
- SchemaRegistry:
- EIP712Proxy:
- Indexer:
Linea Goerli
Version 1.2.0:
Installation
pnpm add @ethereum-attestation-service/eas-contracts
Testing
Testing the protocol is possible via multiple approaches:
Unit Tests
You can run the full test suite via:
pnpm test
Test Coverage
Latest Test Coverage Report (2023-10-31)
- 100% Statements 350/350
- 100% Branches 172/172
- 100% Functions 120/120
- 100% Lines 491/491
----------------------------------|----------|----------|----------|----------|----------------|
File | % Stmts | % Branch | % Funcs | % Lines |Uncovered Lines |
----------------------------------|----------|----------|----------|----------|----------------|
contracts/ | 100 | 100 | 100 | 100 | |
Common.sol | 100 | 100 | 100 | 100 | |
EAS.sol | 100 | 100 | 100 | 100 | |
IEAS.sol | 100 | 100 | 100 | 100 | |
ISchemaRegistry.sol | 100 | 100 | 100 | 100 | |
Indexer.sol | 100 | 100 | 100 | 100 | |
SchemaRegistry.sol | 100 | 100 | 100 | 100 | |
Semver.sol | 100 | 100 | 100 | 100 | |
contracts/eip1271/ | 100 | 100 | 100 | 100 | |
EIP1271Verifier.sol | 100 | 100 | 100 | 100 | |
contracts/eip712/proxy/ | 100 | 100 | 100 | 100 | |
EIP712Proxy.sol | 100 | 100 | 100 | 100 | |
contracts/eip712/proxy/examples/ | 100 | 100 | 100 | 100 | |
PermissionedEIP712Proxy.sol | 100 | 100 | 100 | 100 | |
contracts/resolver/ | 100 | 100 | 100 | 100 | |
ISchemaResolver.sol | 100 | 100 | 100 | 100 | |
SchemaResolver.sol | 100 | 100 | 100 | 100 | |
contracts/resolver/examples/ | 100 | 100 | 100 | 100 | |
AttestationResolver.sol | 100 | 100 | 100 | 100 | |
AttesterResolver.sol | 100 | 100 | 100 | 100 | |
DataResolver.sol | 100 | 100 | 100 | 100 | |
ExpirationTimeResolver.sol | 100 | 100 | 100 | 100 | |
PayingResolver.sol | 100 | 100 | 100 | 100 | |
RecipientResolver.sol | 100 | 100 | 100 | 100 | |
RevocationResolver.sol | 100 | 100 | 100 | 100 | |
TokenResolver.sol | 100 | 100 | 100 | 100 | |
ValueResolver.sol | 100 | 100 | 100 | 100 | |
----------------------------------|----------|----------|----------|----------|----------------|
All files | 100 | 100 | 100 | 100 | |
----------------------------------|----------|----------|----------|----------|----------------|
Instructions
In order to audit the test coverage of the full test suite, run:
pnpm test:coverage
Profiling
You can profile the gas costs of all of the user-focused flows via:
pnpm test:profile
License
EAS is open source and distributed under the MIT License (see LICENSE
).