# Verax Attestations

Holonym issues a Verax attestation for every SBT it sends. The following is an example of how to query and validate Holonym attestations.

### Install

```bash
npm i @verax-attestation-registry/verax-sdk
```

### Code

In this example, we check the attestation for the address `0xdcA2e9AE8423D7B0F94D7F9FC09E698a45F3c851`.

It's important to filter for Holonym's schema ID and attester account and to validate the attestation payload. Here, we are making sure the user has a uniqueness KYC SBT.

See [here](https://github.com/holonym-foundation/holonym-api/blob/main/src/constants/misc.js#L6) for the circuit IDs, action ID, and issuers.

```javascript
const { VeraxSdk } = require('@verax-attestation-registry/verax-sdk');

// Initialize Verax
const address = '0xdcA2e9AE8423D7B0F94D7F9FC09E698a45F3c851';
const veraxSdk = new VeraxSdk(
  VeraxSdk.DEFAULT_LINEA_MAINNET, 
  address
);

// Query attestation registry
const attestations = await veraxSdk.attestation.findBy(
  undefined,
  undefined,
  {
    // Holonym's schemaId
    schemaId: "0x1c14fd320660a59a50eb1f795116193a59c26f2463c0705b79d8cb97aa9f419b",
    // Holonym's attester account
    attester: "0xB1f50c6C34C72346b1229e5C80587D0D659556Fd",
    // Our address of interest
    subject: "0xdcA2e9AE8423D7B0F94D7F9FC09E698a45F3c851"
  }
);

const { circuitId, publicValues, revoked } = attestations[0].decodedPayload[0];

const actionId = publicValues[2].toString();
const issuer = publicValues[4];

// Make sure circuitId matches KYC circuit ID
if (circuitId != "0x729d660e1c02e4e419745e617d643f897a538673ccf1051e093bbfa58b0a120b") {
    throw new Error("Invalid circuit ID");
}

// Validate action ID
if (actionId != "123456789") {
    throw new Error("Invalid action ID");
}

// Make sure issuer is the KYC Holonym issuer
if (issuer != BigInt("0x03fae82f38bf01d9799d57fdda64fad4ac44e4c2c2f16c5bf8e1873d0a3e1993")) {
    throw new Error("Invalid issuer")
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.holonym.id/for-developers/verax-attestations.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.