Quickstart: Publish Attestation

Submit a verifiable attestation to EAS.

1. Install

npm install @oma3/omatrust ethers @ethereum-attestation-service/eas-sdk

2. Fund Your Wallet

The signing wallet needs native gas tokens on the target chain to pay transaction fees.

• On OMAChain Testnet, fund the signer with OMA using the OMAChain Testnet faucet
• To avoid gas fees, use submitDelegatedAttestation instead (see Delegated Attestation API)

3. Submit an Attestation

import { submitAttestation } from "@oma3/omatrust/reputation";

const result = await submitAttestation({
  signer,                                                                           // ethers v6 Signer
  chainId: 66238,                                                                   // OMAChain Testnet
  easContractAddress: "0x8835AF90f1537777F52E482C8630cE4e947eCa32",
  schemaUid: "0x7ab3911527e5e47eaab9f5a2c571060026532dde8cb4398185553053963b2a47",  // User Review schema
  schema: "string subject, string version, uint256 ratingValue, string reviewBody, string[] screenshotUrls, string[] proofs",
  data: {
    subject: "did:web:example.com",
    version: "1.0.1",
    ratingValue: 5,
    reviewBody: "Verified service behavior",
    screenshotUrls: [],
    proofs: []
  },
  revocable: false,
});

console.log(result.uid);     // attestation UID
console.log(result.txHash);  // transaction hash

4. Confirm It Onchain

import { getAttestation } from "@oma3/omatrust/reputation";

const attestation = await getAttestation({
  uid: result.uid,
  provider,
  easContractAddress: "0x8835AF90f1537777F52E482C8630cE4e947eCa32",
  schema: "string subject, string version, uint256 ratingValue, string reviewBody, string[] screenshotUrls, string[] proofs",
});

console.log(attestation.data.subject);  // "did:web:example.com"

What's Next

• Verify reputation — Read and verify attestations
• Delegated Attestation API — Gas-subsidized attestations
• Reputation SDK Reference — Full function signatures and error codes
• Issuer Workflow — Become an attestation issuer