{
  "manageEntity": {
    "action": "Save",
    "entityId": "137649",
    "entityType": "Track",
    "nonce": "0x08e87a7aa452dfe91b38c8c724cdfd812dc80b6e9314f21dbe092191fad257de",
    "signature": "0x0af41c8a04dd8a4e0ba6590356be0879bede42fc865d301071d96b5dc99b91526b28cf63133fc3f1447a9690d2ec80899cdc565b6781685acca6363a9d2e50ac1c",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}