Like what many of said here. Kind of self explanatory...almost "instantly" coins are mined. When the mining slows down significantly, those early miners have a massive advantage.

Goldcoin is a great example...plenty of small to mid range alts out there that are massively instamined.


http://i61.tinypic.com/t65y8i.png

There are 30,000,000 goldcoins in existence currently. The coin started in may of last year...and this shows that 9 million coins, almost 1/3 of all coins currently, were mined within 30 hours.

Source http://cryptometer.org/goldcoin_96_hour_charts.html

take a look at bitbar, too, while you are at it. Why would anyone by in knowing this info? They wouldn't, which is why we need to spread info about instamines.

Use the cryptometer source to look up older coins...unfortunately the dev has not done too many new coins. There are a ton of instamine coins on there.

Coins worthy of looking at for suspect instamines. Primecoin, Peercoin, Litecoin, and most recently, Vertcoin.

The longer the coin survives and rises, the less of a problem an instamine is. Litecoin was definitely instamined, but that only comprises around 1.5% of the total litecoins out there. Not to mention the number of rise and falls litecoin has experienced since its inception...you can't know for certain, but unless the instaminers where holding out for an aburdly high market cap, you can be pretty sure that the 1.5% instamine has already change hands numerous times. Usually those holders will be selling all the way up. The most danger is in the beginning, when they control the highest percentage of the currency.