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Uses about 0.5% of the total in the world electricity production, which is approximately 15 of the included nuclear reactors. [Source] 2. Useless

- Few legal merchants accept bitcoin. - We do not scale: the network reaches approximately 5 operations per second. - Transactions take enough time in order to sign up for blockchain; only after all this midges are not able to be drawn. - Many faster and most cheapest ways to transfer electronic funds in the international market are used. - Bad cost: the price is very unstable, and not the fact that bitcoin will be suitable for solving problems during the crisis. - Basic use today: speculation. Minor use: crime. 3. Insecure 

- Bitcoin-birzhi keep private keys to the bitcoins of their own customers. Several large bitcoins exchanges lost their deposits of partners, upon completion of hacking. [Source] - wallets that are stored on personal computers is difficult to provide. With the help of zero exploits, wallets should be on "air" (autonomous) computers. It is necessary to consider the risks of the malfunction of hardware, hacking, extortion [source], death. - In such circumstances, it is necessary to trust the services of a conditional deposit and/or companies that are claimed to the safe storage of bitcoins. 4. Includes crime 

- Bitcoin is a currency in a darknet, then to purchase drugs, fake money, forged claims for identification, children's porn, stolen numbers of credit cards, exploits of zero day etc.- Bitcoin and similar cryptocurrencies are used in extortion schemes called "extortion programs", where computer networks of companies, hospitals, city governments and individuals are disengaged by hackers. - There are numerous illegal “mixing services” and “wallets for safety reasons for coinjoin” in order to help bitcoin to wash: you send bitcoins and indicate the return address; bitcoins from other participants will come to a specific address. [Source] at that hour as exchanges of the us cryptocurrencies, they must continue to identify data on visitors, you can buy cash in dark websites with bitcoins. [Source] - tether, a centralized cryptocurrency tied to the dollar is often used for shopping or the implementation of cryptocurrencies. It is controlled by bitfinex, the largest cryptocurrencies. He said that the player has 1 dollar cash for all prey, vip-pussy.com, but then admitted that this is not so. In the new year, bitfinex raised the price of bitcoins, buying bitcoin with a binding. [Source] - schemes of action with the cost, which showed themselves illegal when admission to shares, are legal with the help of bitcoins. vip-pussy.com 5. The susceptible to centralization 

- The miners eventually establish the principles and will resist changes in laws, they are not in their interest, for example, replacing evidence of projects for proof. - Shakhtar cartel can form. After the cartel reaches most of the prey, it will change the gameplay from their favor or search for rent in some way. Such a cartel, in addition to this, is capable of an attack with a double disintegum to everyone more to create the last greater surprise before destroying the network.