Bitcoin exchange MtGox is unavailable due to DDOS attack. Bitcoin value plunged by 20% on btc-e as a result. This is a crazy volatile horse trading market. My sense is that arbitrage opportunities are not only limited by liquidity but also by daily transaction limits.

How to really make money with Bitcoin

Bitcoin is the new speculation hotness. Never mind that it costs more in energy to create a bitcoin than the coin is actually worth.

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