{
  "manageEntity": {
    "action": "Save",
    "entityId": "855905654",
    "entityType": "Track",
    "nonce": "0x57c8a9d61d3ca4b4f825368908ea508204d50108cc995c86a950406d7565b855",
    "signature": "0x27ce3df536a88cbeab840d8a21aee2ea47e48a20890483e52e4494a488fd90951e5504fd84e473424d2de68f56e7028aafdffce07fb89de71db23d2dcc4dad261b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}