Here we provide a little bit of documentation about the asset HZXGG that is implemented on the Horizon platform (as asset ID 9135223305704161249).
HZXGG represents GeistGeld, an ancient coin merged-mined alongside BiTCoin, as implemented on the Horizon platform.
The currency consists of I'm not sure how many coins, even though it was originally inspired by BiTCoin. Unfortunately we were technically unable to create it as a currency on Horizon so had to create it as an asset. The issuing account created 100,000,000 so that if up to that many of the coins get transfered to the Horizon platform the platform is ready to handle them all. However, any that remain in the issuing account are taken as not having been issued on the Horizon platform.
Any GeistGeld that have been issued to the Horizon platform are transfered out of the issuing account, so that the amount by which the issuing account is short of 100,000,000 is the number of XGG (GeistGeld) that has actually been issued onto the Horizon platform.
Some potentially useful tables and plots are online at http://galaxies.mygamesonline.org/digitalisassets.html