{
  "manageEntity": {
    "action": "Save",
    "entityId": "384892",
    "entityType": "Track",
    "nonce": "0x4f9d26ace26e0402b6e7c8ae50c387830fe88fee7d57abbba81eeea3c212b4b3",
    "signature": "0xcd7138aed57be1dd3dc77adba6fbfa61013c819cd52cdde5f8f2253b28911cf0757c310e7b867df72bee35ea8ce6978771c58b59c1c69146557883e33248afdc1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}