{
  "manageEntity": {
    "action": "Save",
    "entityId": "334647966",
    "entityType": "Track",
    "nonce": "0xa2122bcc2a51d84a985731837c8aa5c3619d48755d0d70d609451c0e1f920e97",
    "signature": "0xb295a55905b6de4b9a9b8c6a2be861cb131b2d84997f9f97799b3ad57a0ce1a6449b29b2d385009d3c97d15dc5f029801ab5d8324cfcf687612aa149a35872011c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}