{
  "manageEntity": {
    "action": "Save",
    "entityId": "188978089",
    "entityType": "Track",
    "nonce": "0x19ef602a9f7ba1853473c4d8986e93aaaa87ae49a317c17d5193ff920c403f2e",
    "signature": "0xb814b7e0638afd8fe7588f1d4e5e4547bf4ab37bf4e922f9c1352370efad59e20a97cd31ec56d6039402f12712f4009fe3c1534c8a18896401680f9cf640adb41b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}