{
  "manageEntity": {
    "action": "Save",
    "entityId": "527719109",
    "entityType": "Track",
    "nonce": "0x881e67bdb9f8f748b45338416f2dc403b8add98411ce7e611afefd6c194c7acb",
    "signature": "0x1920bce4a8c56d57d3652334667b9f6b6fc28675ec623f5d5dc2977cacbc5fc410f8775db7088ab142a9ef2690a9510534e1a5a9d95bb3e2126e69592743e10f1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}