blockstack publickey inside authresponsetoken

authresponsetoken.js

{
  header: {
    alg: "ES256K"
    typ: "JWT"
  },
  payload: {
    core_token: null,
    email: null,
    exp: 1544801401,
    hubUrl: "https://hub.blockstack.org",
    iat: 1542209402,
    iss: "did:btc-addr:18i5dXhP2rPCQFGjhQentVwpYSgDZNQ8Gr",
    jti: "708ebb81-0c80-4949-908c-4de670706290",
    profile: null,
    public_keys: [
      "03c283cdcebeb0d30c9e693e88cd61ba5b6290e8d84fb557dfecbca06a3f3fb2c2"
    ],
    version: "1.2.0",
    signature: "J6E5oLNyJsOctjq4rNax0b-wgqDiXj4fGODOCqQ98YDdN-CXwwcYxPMuw3M4pmqkuGV6CcllMGlF1pwrupQC6Q",
  }
}