{
  "manageEntity": {
    "action": "Save",
    "entityId": "1412450744",
    "entityType": "Track",
    "nonce": "0xfc24f59c8c78a90a1ce273277f0c8350537b4d5ae4cb7baace1594ee6bdc2e5c",
    "signature": "0x81378e192ee9015d191a24ba4d198f2f43ecad445fdb36982fef70a7bf450df7542be29db72d3b3dee6a690db2cff989c3ddb37f1261cf077ac13f4782a13d9f1b",
    "signer": "0x6f20258D1188c4f08d27788Ecc9ce87B6af3913e",
    "userId": "469120908"
  }
}