{
  "manageEntity": {
    "action": "Save",
    "entityId": "659661537",
    "entityType": "Track",
    "nonce": "0x2abfbe86349600dbb16acab968c7fe423f23dbe6d6f7eb895522e5ff61c4340e",
    "signature": "0x2426e8806595b00e5b9cdec607a58de941eb5d83ccab1e308ee0c1d757fc69a14b150ab323203775d07e2e4b4202366d263bf64786bd9d31b59b8b9074775d221c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}