Bitcoin is a cryptocurrency, a form of electronic cash. It was designed to be a decentralized digital currency without a central bankor single administrator, where bitcoins could be sent from user to user on the peer-to-peer bitcoin network without the need for intermediaries.[7] As of August 2018, bitcoin is generally used as a medium of speculation and is seldom used in other types of transactions.[9] Transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a blockchain. Bitcoin was invented by an unknown person or group of people using the name Satoshi Nakamoto[10] and released as open-source software in 2009.[11] Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies,[12] products, and services. Research produced by the University of Cambridge estimates that in 2017, there were 2.9 to 5.8 million unique users using a cryptocurrency wallet, most of them using bitcoin.[13] Bitcoin has been criticized for its use in illegal transactions, its high electricity consumption, price volatility, thefts from exchanges, and the possibility that bitcoin is an economic bubble.[14] Bitcoin has also been used as an investment, although several regulatory agencies have issued investor alerts about bitcoin.

Market sentiment (also investor attention) is the general prevailing attitude of investors as to anticipated price development in a market.[1] This attitude is the accumulation of a variety of fundamental and technical factors, including price history, economic reports, seasonal factors, and national and world events. If investors expect upward price movement in the stock market, the sentiment is said to be bullish. On the contrary, if the market sentiment is bearish, most investors expect downward price movement. Market sentiment is usually considered as a contrarianindicator: what most people expect is a good thing to bet against. Market sentiment is used because it is believed to be a good predictor of market moves, especially when it is more extreme.[2] Very bearish sentiment is usually followed by the market going up more than normal, and vice versa.[3] Market sentiment is monitored with a variety of technical and statistical methods such as the number of advancing versus declining stocks and new highs versus new lows comparisons. A large share of overall movement of an individual stock has been attributed to market sentiment.[4] The stock market's demonstration of the situation is often described as all boats float or sink with the tide, in the popular Wall Street phrase "the trend is your friend". In the last decade, investors are also known to measure market sentiment through the use of news analytics, which include sentiment analysis on textual stories about companies and sectors.

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