{
  "manageEntity": {
    "action": "Save",
    "entityId": "352535",
    "entityType": "Track",
    "nonce": "0x6f57e1d7434fd61558456fc77ce5f83604d4bec21024a499eb8d64dcde309ccb",
    "signature": "0x9dc202395e05f2b7e0df22a6ae4b9d77b04693558a6088ae74a3f0c5005a8fa015c94e8107ef9c5c1a2ccf824243f96f2840e41c73603ad95a1abaaacc6ea9e51b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}