{
  "manageEntity": {
    "action": "Save",
    "entityId": "618127143",
    "entityType": "Track",
    "nonce": "0x446850ec7a5a63d12f0dc73dd6ef72683c1e0682c83ffe935dc02951e9beb638",
    "signature": "0x19ee2a3f75dc6ae006ea47e95e837689b6c3ae4fd110fc496b8792de6b2c92d423c356dc07810b0a68e5131e3550c99f1b5cef73ecb65933ffd06d6236ef1cc41c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}