IPO / Crowdfunding – 50% of all coins will be used to gather and secure value in gold for each Guarant Coin ever mined
(note that all IPO coins will be sold to backers)
Block reward – 100 GTC
Block Time – 180 seconds – 3 minutes
Amount of coins – 20.736.000
Block reward halves – every 103.680 blocks – 1/2 year
Difficulty retargets – every block (Multipool protection)
Umm, you have some math problems I think. First, the block reward halving is every 103680 blocks. But... um... at three minutes per block that would mean it would actually take 216 days to hit that mark, which is more like 2/3 of a year. That's only a small error, however, compared to the absolutely stupid mistake made with the block rewards. At a reward of 100 GTC per block, you're looking at 10,368,000 GTC in 216 days, at which point the reward gets cut in half. That would be fine, except I believe the IPO already took half of the coins, right? So really, in 216 days, the GTC are all gone. Oops. Either you need to adjust the block reward to 50, or you need to double the coin supply, or perhaps the IPO wasn't 50% of all coins, in which case you need to clarify the number of IPO coins.
Your website looks pretty professional, so I'd like to give you the benefit of the doubt, but then if you could scam people out of 50 BTC in a few days before things get figured out, you'd make a lot more than that site would cost to create. Better come back with some details really fast, or I'm lumping this into the scam bucket with a lot of other coins! Seriously: cryptocurrencies are fundamentally based on math. How can you hope to create a successful cryptocurrency if you fail so badly at basic math!?
Also, we need a block explorer, pronto -- that would at least let us see the premine/IPO amount.