During the minting process, users are required to enter "**birthmark**" phrases. \
There are two objectives of the birthmark:
* **Seed in determining fish generation**\
The birthmark **plays a role in how a fish model is generated**. In other words, it is impossible to generate two fishes that look exactly the same.
* **Memory storage in fish eyes**\
Birthmark phrases will be carved into the eyes of the fish (permanently) when a fish is minted.
