{
  "manageEntity": {
    "action": "Save",
    "entityId": "1240781532",
    "entityType": "Track",
    "nonce": "0x2a1877145a7b732a3611447fee05fe101885bbf700a0aa3adb182751636a1a00",
    "signature": "0xc64bc52d229070bb217d0a5690a307ab4d74061c1bbbfb3a02306e2c5d43377910703e96a0407b09b9ea8edb7a0ff6651cf9d56069d66e997c02ea19c1a753a81c",
    "signer": "0xF7F56DF4D8a2Ae2BF9Ca645DC684f84c37BbDaFe",
    "userId": "116272245"
  }
}