{
  "manageEntity": {
    "action": "Save",
    "entityId": "2147384401",
    "entityType": "Track",
    "nonce": "1787779383136513316",
    "signature": "0x2383991589f68da6fa5da5ce8b8a59c0a56ffc0f7cf38b7d669cc9152ad5b0091471b95031e8b70b8bf843747dd07fea92ae868f0b3a8348abae0c7eb57f96e91c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}