{
  "manageEntity": {
    "action": "Save",
    "entityId": "389780928",
    "entityType": "Track",
    "nonce": "0x4ba0b67b8f078fa0c82c69c7efc22983adb1a1e6b1e76f8045a0734fce54648b",
    "signature": "0xaf08e3509b323d4513cac392c8a4f5986bf800b137067092448f512120893763002082513cc7076c8621596ebec36e2e2bd430af44525765353dd9dd09307b9b1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}