{
  "manageEntity": {
    "action": "Save",
    "entityId": "651444589",
    "entityType": "Track",
    "nonce": "0x599cbde45bf0bb6bdb3e3408819ea9ad10e3bb168fef3d7b7861e821c707f45f",
    "signature": "0x5f1a8e70c0c1d713a890e233674411aeadf05ae665ce7de52fa0a6d477fe3bdf02db36d4001b4ab2c90367f114c40fb57641be4eb79d748b2bb5be96205029961c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}