Illustrator, is likely bitcoin, there is a fixed maximum amount that can be mined, and the difficulty for mine it (in resource needed) increase/decrease based on the speed that this gold is mined.
You can find all those information in the Gold Tab, inside the game.  The resource needed for mine gold adjust every hour.

Also the amount of real gold to back it ever increase.  Those both condition should assure a goldentown gold value in the trend stable/raising


Thanks for the technical question

I remember who want to join the promo to read the first post of the thread and follow the listed procedure