{
  "manageEntity": {
    "action": "Save",
    "entityId": "403447059",
    "entityType": "Track",
    "nonce": "1787830068892869439",
    "signature": "0xf62b5724e403b92e4d30b7da500b6a6ce172ff9f3951efa57271fb876816ee1040bf66f0185bef1a4e67095fefbf905ee1eb8b5619f5777459a48adfa8a5b6e31b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}