{
  "manageEntity": {
    "action": "Save",
    "entityId": "1368641500",
    "entityType": "Track",
    "nonce": "0x6dc9281e3eb243e71bfd0cc029d3d57c1d64a35905e240f91b5445e52617e16c",
    "signature": "0xe0ddc957c0ca599f0b96e839f72635d9dbebd1864560a21cb2f5e936de9977c9143e8177bd4e0ca73378f52e4f8c2ec9399b1a4a84dc51430d76586ba89628171b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}