{
  "manageEntity": {
    "action": "Save",
    "entityId": "397812347",
    "entityType": "Track",
    "nonce": "0x742e1c94e98f01d17688beae5faa1c8c704143ba97a524b262c232a57cdeb5fb",
    "signature": "0x6e6c5ac351e926ab6e157ccbfdd1f5b44aad450c01b66d7aef8bf8c85a7814462afd9af4b25c07241bd4ea294ade88be4281b15a7e00e6f494bf2a9f469e3ec11c",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}