Yes bitcoin is a common currency that accepted by so many countries world wide and aside of being a digital currency it can be used also as an investment and might become more profitable once the market price is increasing.
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To my observation and research Bitcoin is partially private because not everyone has access to it even here in the blockchain or crypto community many of us don't have bitcoin. According to the research I carry out it says that bitcoin is an unregulated digital private currency created by Satoshi Nakamoto in 2009. Though it's acceptable by some countries why many keep avoiding it to secure their economy and citizens.