{
  "manageEntity": {
    "action": "Save",
    "entityId": "1057815",
    "entityType": "Track",
    "nonce": "0xc7446885c1f3939066ca9e715c9cd8b70ac5fd93403da36a39f67ecb4eb32aa4",
    "signature": "0x305274ff16118394f4087768ac96d655262ddb2bcc6bede764234368a8c1c76b03772c25aadc5c9e71cefe369b8faa6d50e35a477cda8be092b3278aad9275c51c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}