{
  "manageEntity": {
    "action": "Save",
    "entityId": "1425663818",
    "entityType": "Track",
    "nonce": "0x8075f57756c84989b9c730bb3e2db47d770ea4389706b06cec2378a1a6466710",
    "signature": "0x578e5193e11243a4a53df8d74df64e768b7267555379653b5f10fc9febc751f433c2877bdee26a6b0887315f2cf9ef7c0705f4180ac60d7d734f3e89d82a2a421c",
    "signer": "0xF7F56DF4D8a2Ae2BF9Ca645DC684f84c37BbDaFe",
    "userId": "116272245"
  }
}