Among the numerous websites providing Bitcoin exchange services, the positive reputation of CEX.IO makes it worth the trust of the users all over the world. With the customer base of over 1,000,000, the platform can be recognized as the one that can be relied on. Starting your Bitcoin trading on a platform with substantial history, you will benefit from a deep understanding of the market and customers’ needs.

Unfortunately despite having a dedicated US part of the site (link to http://www.etoro.com/usa) , eToro doesn’t seem to accept US clients at this time. Here’s a part of the Q&A section that deals with this question: ‘’As part of our ongoing optimization process currently underway in the US, we have temporarily suspended our service. Therefore, at this time we will not be accepting new clients or funds from existing US customers. While you’re here, you are welcome to continue experiencing eToro  through our practice mode, which will stay available and free to all.’’’

An example of a nothing at stake attack is an attacker buying lots of "old stake" from users inexpensively (inexpensive to users who no longer have stake in the currency). This can be made convenient by offering small payments to users for uploading their wallet.dat. Eventually after accumulating enough "old stake", the user can begin creating blocks and destroying as many or more coin days than the network was at that time. This block generation can be repeated until it catches up to and beats the current main-chain very cheaply.
Trading requires daily technical analysis and a sound understanding of trading platforms. I wouldn't recommend this unless you're experienced with eToro or an MT4 platform. That said, there are benefits to bitcoin trading. It gives you the option to quickly scale in and out of positions, and take profits at a desired price. When you trade bitcoin, you can take advantage of daily fluctuations in price. The CFD brokers used for trading are regulated, and your funds are arguably more secure than at an exchange like Coinbase. You will be charged spread (fee) on each trade, but you can execute a buy or sell order quicker. The biggest benefit to trading bitcoin is the limit - it's far easier to open a $100,000 position at a CFD broker than go through stringent checks and buy an equivalent amount on Coinbase.
At the time when this guide was written, January 2014, the price of one bitcoin stood at $913, down slightly after reaching an all-time high of over $1,200 earlier in December. The new cryptocurrency came a long way from trading below $4 just two years ago. Major online and offline retailers are starting to add the new currency as a payment method. But what exactly is bitcoin?
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