{
  "manageEntity": {
    "action": "Save",
    "entityId": "1541139189",
    "entityType": "Track",
    "nonce": "0x3640bb96df670c5d368886b4fa7b5af35d232c5481338df682c77a5ace212fa5",
    "signature": "0xdde8e646b00c321032702cdc704897648eb2875a84c16bbfcf0e0183e7ff632212d444859e18760ca9a979a16095b1e0d918dcae0cb64e4190fd98348b8dcc4b1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}