Ethereum Attestation Service
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.
Ethereum
v0.26
- EAS:
- Contract: 0xA1207F3BBa224E2c9c3c6D5aF63D0eb1582Ce587
- Deployment and ABI: EAS.json
- SchemaRegistry:
- Contract: 0xA7b39296258348C78294F95B872b282326A97BDF
- Deployment and ABI: SchemaRegistry.json
Arbitrum One
v0.26
- EAS:
- Contract: 0xbD75f629A22Dc1ceD33dDA0b68c546A1c035c458
- Deployment and ABI: EAS.json
- SchemaRegistry:
- Contract: 0xA310da9c5B885E7fb3fbA9D66E9Ba6Df512b78eB
- Deployment and ABI: SchemaRegistry.json
Sepolia
v0.26
- EAS:
- Contract: 0xC2679fBD37d54388Ce493F1DB75320D236e1815e
- Deployment and ABI: EAS.json
- SchemaRegistry:
- Contract: 0x0a7E2Ff54e76B8E6659aedc9103FB21c038050D0
- Deployment and ABI: SchemaRegistry.json
Optimism
v1.0.1
- EAS:
- Contract: 0x4200000000000000000000000000000000000021
- Deployment and ABI: EAS.json
- SchemaRegistry:
- Contract: 0x4200000000000000000000000000000000000020
- Deployment and ABI: SchemaRegistry.json
Optimism Goerli
v1.0.1
- EAS:
- Contract: 0x4200000000000000000000000000000000000021
- Deployment and ABI: EAS.json
- SchemaRegistry:
- Contract: 0x4200000000000000000000000000000000000020
- Deployment and ABI: SchemaRegistry.json
Base Goerli
v0.27
- EAS:
- Contract: 0xAcfE09Fd03f7812F022FBf636700AdEA18Fd2A7A
- Deployment and ABI: EAS.json
- SchemaRegistry:
- Contract: 0x720c2bA66D19A725143FBf5fDC5b4ADA2742682E
- Deployment and ABI: SchemaRegistry.json
Installation
pnpm add @ethereum-attestation-service/eas-contractsTesting
Testing the protocol is possible via multiple approaches:
Unit Tests
You can run the full test suite via:
pnpm testTest Coverage
Latest Test Coverage Report (2023-08-08)
- 100% Statements 290/290
- 100% Branches 142/142
- 100% Functions 105/105
- 100% Lines 419/419
----------------------------------|----------|----------|----------|----------|----------------|
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 | |
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:coverageProfiling
You can profile the gas costs of all of the user-focused flows via:
pnpm test:profileDeploying
The contracts have built-in support for deployments on different chains and mainnet forks. You can deploy the project by:
pnpm deployThereβs also a special deployment mode which deploys the protocol to a mainnet fork, with additional goodies. It can be run via:
pnpm deploy:forkThe framework was inspired and adopted from Bancor V3.
License
EAS is open source and distributed under the MIT License (see LICENSE).