{
  "manageEntity": {
    "action": "Save",
    "entityId": "573563",
    "entityType": "Track",
    "nonce": "0x6146f18309bd29b37433814dee67855985a2b169a22b61591a0175acbe2e4ff8",
    "signature": "0x6088bcb9495b47ead59d6e12f01068b30d7a185861a321ab842ae508319a5d795d3fc3e42dcdba496c35c113076478f3f24b8c137e1709f7b070d7f32b944df41b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}