{
  "manageEntity": {
    "action": "Save",
    "entityId": "564757",
    "entityType": "Track",
    "nonce": "0x042e3e8c62b142be03bb50d5a93daf598a14f570ce0a89f258631d3d663117f7",
    "signature": "0x83000b886929c35b259e1d9d723f25c28ff88ea2f5e843263a8b0b604552231c673eee8fcee9518a0e03a55807fdbf470940b78858c25f0cae4e894b00111a1a1b",
    "signer": "0xA9012b628a5Bed1406f97647fc6Be02eC3BF75b1",
    "userId": "141875639"
  }
}