{
  "manageEntity": {
    "action": "Save",
    "entityId": "851031334",
    "entityType": "Track",
    "nonce": "0x9290e565d30b4e24ac34d083c6a94b796e86a0aafa5aac2308dbc587bc2fcb54",
    "signature": "0x473ab80537142a9c5311095c5775aab56d46aa82f0878dc705a8c60db7fdac574222f35cefdf436732d4824b74576bc1f89c94ab3f218af1c46caffc1f555b8e1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}