Re: MtGox closes shop!
The blockchain records every single transaction - of present and past - and the ownership of every single bitcoin in circulation. The people who are constantly verifying the blockchain, ensuring that all the information is correct and updating it each time a transaction is made, are called 'miners'. One way to think of miners is: they those who confirm transactions. Their job is to ensure that the transaction is secure and processed properly and safely. In return for their services, miners are paid fees by the vendors/merchants of each transaction and are also given physical, minted bitcoins.
Taken from Bitcoin explained in laymans terms - NDTVProfit.com The physical, minted part is digital of course. There were a couple companies that would make a physical bitcoin but who knows where you could actually use it.
Or you can read https://litecoin.info/Comparison_bet...ogress_version for the alternative coins (Scrypt-based) which is what most GPU miners are doing including myself.
Bitcoin is practically impossible to mine with graphics cards anymore. You need ASICs (Application Specific Integrated Circuits) which are specialized chips programmed to ONLY decrypt SHA256-based coins. Nowadays, ASICs are extremely overpriced and you need at least 1 TH for ~$1000 to see a profit; depending on your electricity per KW/h.
Scrypt-based coins (Litecoin, Dogecoin, etc.) were written in a different algorithm, and there has not been any ASIC-like devices released yet. Gridseed is close, because it uses 1/5 the electricity as a normal GPU; but I am not sold on them yet and you essentially purchase 100x the same unit and wire them up together. Scaleable, but not overtly powerful.
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