After Bitcoins hit the market successfully, new crypto currencies were developed with few different unique and interesting characteristics relative to BTC. Some emerged in order to emulate BTC's success while others tried to perceive the limitations in BTC and prove competitively stronger. One of them is AltCoins (ALT). ALT adds random block reward mechanism. BTC could not completely be accepted as a legal currency since it is decentralized. Some potential points were left out in opposition to the challenge of its mission as a decentralized currency. However, today the BTC has transformed from a decentralized to a much more centralized one as its computational power is been controlled and managed by large data centers. Read full Article: http://buybitcoinsguide.wordpress.com/2014/04/15/what-is-bitcoins-how-to-buy-bitcoins/