GoldCoin (GLD) is the Gold Standard of Digital Currency - With large vibrant support, trading communities, real world appeal and an extremely devoted development team, GoldCoin is the Gold Standard of Digital Currency. Block time + difficulty changes depending on the height of the block chain along with demarcated block rewards. The GoldCoin team have implemented Golden River - a method to adjust the block time each block to counteract large swings in hashing power pointed at the network - this method is smoother than than the Kimoto Gravity well meaning block times are more closely regulated.