{
  "manageEntity": {
    "action": "Save",
    "entityId": "1489912050",
    "entityType": "Track",
    "nonce": "1792376359313659424",
    "signature": "0x6999f727f1347d654b6cdf525bdcd30061dfc43b39158a5505d0262f7c21b9e37774cdb72951ffa011de3943a15cf66e3c183d30b815e2802bfb825c79de3efa1c",
    "signer": "0x9B241b1a6A99d662AE67D328e091Fc94faF23fdc",
    "userId": "881446128"
  }
}