{
  "manageEntity": {
    "action": "Save",
    "entityId": "449928615",
    "entityType": "Track",
    "nonce": "0x5d958a63be7375491f2e49a0abe2bc6870d4820962ccfe60eae4a1d3d3c5b5ec",
    "signature": "0x0afe69153c72da94b880ca5173ddb5fd75f9c2fefb94112c962b3207a452c6eb27720550a2a2728d76472d01504b54d18080731c23ac4c5a2b9fcd5e400720e41b",
    "signer": "0x92a5082636c97Db0Ae888484D85e4c8494A3B791",
    "userId": "895527427"
  }
}