{
  "manageEntity": {
    "action": "Save",
    "entityId": "954473",
    "entityType": "Track",
    "nonce": "0xbd8a67807f691a7a4ddb922bd1e5cf35cd1ad352c92a59145f6945f0670712fd",
    "signature": "0x90173d70c94cf6de736705307ee8a7e7f9c8ecccede3044d15f175dfef5c59cf24c2927f6696f4ece3b89cd4bc92c7430f7ca0a101d74f513d6c11d72d20d3331c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}