{
  "manageEntity": {
    "action": "Save",
    "entityId": "443133713",
    "entityType": "Track",
    "nonce": "0x9b91010bc84fced9fa59b580bba7d9fce3cb7f2cd8cc525e670f964f3df80f1d",
    "signature": "0x25575f91118d5df54816963d488f62e978744901450685afa021960cf31a266c20daf8aa2771065d57568486c72c18a5456ded41aff9602cc5a6c7f35a96d82f1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}