{
  "manageEntity": {
    "action": "Save",
    "entityId": "1893610874",
    "entityType": "Track",
    "nonce": "0xf8d424d6344dbf028f2629dfb3fba7923a11f026a7d838f636783cae1257b227",
    "signature": "0xd9ec08fac71acac34491361813f1c732f40cae4d6ffc9fdda60474a115d9787f47973d51f886e0bb589e4618df6f3a717fdd3acef9ae4d4b726636c19b9d04921c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}