{
  "manageEntity": {
    "action": "Save",
    "entityId": "598470885",
    "entityType": "Track",
    "nonce": "0x6c198ff6b06d697b2b54154a6651cfc68d89485ec82df9767db2822dca61cec3",
    "signature": "0x7a7a381f4164c8230d09b62422579464ca5a3c0f132efaf1603f233b52a773aa0edd905da34dd9110af7f6395d032910bced3a5f17c258cb0dafd92176858cfb1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}