Percentage of risk in bitcoin investment may not be easily determine since bitcoin's price is not stable, when we say not stable it means the price itself varies from different factors like, the maximum level of investors, some issues that bitcoin are facing, etc.

Therefore, risk in bitcoin and risk in trading are almost the same. You will never know what are the risk that you are going to encounter in bitcoin or trading unless you experience it.

We must be realistic that the risk of keep bitcoin is very large, even can make us stress because the price is very volatile.

Certainly very large if the bitcoin investment, this is because until now no country officially using bitcoin.

Bitcoin value is driven by the community support.It has no government or central authority to ensure its value.Its price increases and decreases in proportion to variation in demand for bitcoin.So,its a risky investment.But bitcoin has given huge returns to its investors in the past.

In finance, risk can be measured according to the different factors that can affect an investment. There are two classification of these risk factors which are the Internal Risks and External Risks.

1) Internal Risk Factor- For Bitcoins, internal risks would be the rate of Bitcoin from time to time. It my by raising for some time but eventually, Bitcoin being a cryptocurrency, will also depreciate in time. It is innate to all currencies, that may include Bitcoin cryptocurrency, that it will appreciate and depreciate from time to time. And we can never know when.

2) External Risk Factor- Bitcoins' external factor includes the political and legal stand of a specific country. Some other countries do not recognize Bitcoin and even discourage people into it. And with that, other countries may also ban Bitcoin.

If you buy bitcoins and put them on cold storage in the calculation that in the long run they will bring good profits, then the risk will be minimal. In this case, the risk is only that it is possible for some reason to lose the personal key to the wallet or it will become available to other persons. It must be feared and take the necessary precautions

It depends on what venture are you going to enter.  If you are just buying and holding Bitcoin for a long term, with the current trend of Bitcoin, the risk is somehow unknown since bitcoin price keep on fluctuating wildly but most believe that when the market is saturated, our bitcoin investment today will have a lot more value in the future.

There are a lot of Ventures in bitcoin investment, most of people choose trading or mining. Both of them has high risk. Trading need skill and a lot of knowledge, even mining is only profitable for those who only with specialized and high powered machinery. We must do the right, by right method in the right time to minimize the risk.

If trade bitcoins on the stock exchange then there is no risk. The price fluctuates constantly and therefore traders can earn bitcoins every day. Even if some surgery, you will lose money they can quickly recover. Just like any other business, trade experts should be engaged.