{
  "manageEntity": {
    "action": "Save",
    "entityId": "670550",
    "entityType": "Track",
    "nonce": "0x5db5f9d6dd8b7b3a7dcd0abff49d388fe684679aac8ce741827ce671c4ec9110",
    "signature": "0x85bc05bc892b3b5d453b20f184cbf7982bfb58c0ccce2a80ea64462f34d6fd8a313a2d0418d5896da07aecfb799e0d41cc27cd65e26f2d86e2953ab3d7b5de7f1c",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}