{
  "manageEntity": {
    "action": "Save",
    "entityId": "309716172",
    "entityType": "Track",
    "nonce": "0xd579d407e75999d5f185cdca5ffdf7a70a870a305024f1483a6c6a06c35c614d",
    "signature": "0x635563c8a146abb4077bd3df391c68d2dd4961963a4d1fd21febb59c302413c546c05092a54023743e30670ed29e59e796a3bc38153989ba2a1063dc1e4e7b571b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}