{
  "manageEntity": {
    "action": "Save",
    "entityId": "663779740",
    "entityType": "Track",
    "nonce": "0xa79a8110e120a426f76fb79ea69b04b3619101b0b5e41a8004c324266d1360ef",
    "signature": "0xcdc1578d57a300cbd78dbe095d28bba82f4ce3e658150f445235300a52b2a16371d5c8c5c336f711c287f53d8082f7b07a03602fbd15f8eea94fba90806035441b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}