{
  "manageEntity": {
    "action": "Save",
    "entityId": "1504521985",
    "entityType": "Track",
    "nonce": "0xa201ba434504bee12b7043aee7b98a1d6335d0d67ac4d7b1c612c675d6e3aa47",
    "signature": "0x9f9696a313f4a671a86a186206e7177ac292e7cbfa5f77a554be8b79254b450b2bb5d1e7671227af37f174192c50ed496875ca8433698679da8d53e08461f1f01b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}