{
  "manageEntity": {
    "action": "Save",
    "entityId": "1959642706",
    "entityType": "Track",
    "nonce": "0x6dac7cb29499c9b9091266071c82639b4618f7020967c284acc107ee9c6fa881",
    "signature": "0x3a4913bbc8dc95641d642e661faadf5bbdd4f56edcc4f117c8d3fc3f72b67b4973c4dfb6034b3b6da0b3a09ab91bdb851101e5dfc1e1b9a16e1f3a943e1e0f511b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}