This is fake beeswax.
Stirring lines and red blood streaks are clearly visible, but naturally occurring flow lines are not like this. Your certificate is probably a big one. Nowadays, many imitations have private websites. Scan the QR code and try to identify it carefully. Tongzhu, is it you? It’s not that Di Da’s certificate is fake. If he copies a certificate and makes something similar, it’s hard to tell whether it’s the one in the picture!