{
  "manageEntity": {
    "action": "Save",
    "entityId": "1750577938",
    "entityType": "Track",
    "nonce": "0xf78c442ebe5f6cbbdc7411dc5990bb4908212ed73e5ff77ff3f21e9418b46333",
    "signature": "0x21ace8d49b44b2c66943c60144d83a296401e8884b94ecf41bfd48463e1858312074c6ed02cdc6dd67c5ed6e108ca2079c2a5171519190adda7e045ae974916b1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}