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---
title: "did-jwt"
index: 3
category: "reference"
type: "content"
---

## Algorithms supported

- `ES256K` the [secp256k1 ECDSA curve](https://en.bitcoin.it/wiki/Secp256k1)
- `ES256K-R` the [secp256k1 ECDSA curve](https://en.bitcoin.it/wiki/Secp256k1) with recovery parameter

## DID PublicKey Types

The `PublicKey` section of a DID document contains one or more Public Keys. We support the following types:

Name | Encoding | Algorithm's
---- | -------- | -----------
`Secp256k1SignatureVerificationKey2018` | `publicKeyHex` | `ES256K`, `ES256K-R`
`Secp256k1VerificationKey2018` | `publicKeyHex` | `ES256K`, `ES256K-R`
`Secp256k1VerificationKey2018` | `ethereumAddress` | `ES256K-R`

## Claims

Name | Description | Required
---- | ----------- | --------
[`iss`](https://tools.ietf.org/html/rfc7519#section-4.1.1) | The [DID](https://w3c-ccg.github.io/did-spec/) of the signing identity| yes
[`sub`](https://tools.ietf.org/html/rfc7519#section-4.1.2) | The [DID](https://w3c-ccg.github.io/did-spec/) of the subject of the JWT| no
[`aud`](https://tools.ietf.org/html/rfc7519#section-4.1.3) | The [DID](https://w3c-ccg.github.io/did-spec/) or URL of the audience of the JWT. Our libraries or app will not accept any JWT that has someone else as the audience| no
[`iat`](https://tools.ietf.org/html/rfc7519#section-4.1.6) | The time of issuance | yes
[`exp`](https://tools.ietf.org/html/rfc7519#section-4.1.4) | Expiration time of JWT | no

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