{
  "manageEntity": {
    "action": "Save",
    "entityId": "622612591",
    "entityType": "Track",
    "nonce": "0x821eb51e951cfa2f5c5d78d8fdc236bbb5658fd185490e95230215ce47b5d104",
    "signature": "0x38a4bb2c0f52abaaa2b1c96373535ce0f33ead83240a98142a8d1d8c04b492d55c2a8c1947426f80aa92adaf92d4c3dc0cef036489f6a7e7e42b42f0ad540e251c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}