Defects of bitcoin

4. Bitcoin (bitcoin: bitcoin) was originally a kind of network virtual currency, similar to Tencent's q-coin, but it has been able to buy real-life goods. It is characterized by decentralization, anonymity, and can only be used in the digital world. It does not belong to any country or financial institution, and is not subject to geographical restrictions. It can be exchanged anywhere in the world. Therefore, it is used as a money laundering tool by some criminals. In 2013, the U.S. government recognized the legal status of bitcoin, making the price of bitcoin soar. In China, on November 19, 2013, a bitcoin was equivalent to 6989 yuan

in 2009, Nakamoto designed a kind of digital currency, namely bitcoin. The booming bitcoin market has gone up and down, and the identity of its founder "Nakamoto" has always been a mystery. Rumors about "the father of bitcoin" involve from the US National Security Agency to financial experts, and also give bitcoin a mysterious aura

on January 7, 2014, Taobao announced that it would ban the sale of Internet virtual currencies such as bitcoin and lightcoin from January 14. On February 26, 2014, Democratic Senator Joe Manchin of West Virginia issued an open letter to a number of regulatory authorities of the federal government of the United States, hoping that relevant institutions would pay attention to the status quo of bitcoin encouraging illegal activities and disrupting the financial order, and demanded that actions be taken as soon as possible to completely ban the electronic currency. On January 11, 2017), the Shanghai headquarters of the people's Bank of China and the Shanghai Municipal Finance Office carried out on-site inspection of bitcoin China, focusing on whether the enterprise carried out credit, payment, exchange and other related businesses without permission or license; Implementation of anti money laundering system; Fund security risks, etc. On January 12, 2017, the business management department of the people's Bank of China also entered the trading platforms such as "fire coin net" and "currency bank" in Beijing
on May 12, 2017, a global outbreak of bitcoin virus madly attacked public and commercial systems! More than 40 hospitals across the UK have been widely hacked, leaving the NHS in chaos. The campus networks of many colleges and universities in China were also occupied. Nearly 74 countries in the world have been seriously attacked
currency characteristics

Decentralization: bitcoin is the first distributed virtual currency, and the whole network is composed of users without a central bank. Decentralization is the guarantee of bitcoin's security and freedom
Global Circulation: bitcoin can be managed on any computer connected to the Internet. No matter where you are, anyone can dig, buy, sell or collect bitcoin
exclusive ownership: the private key is required to manipulate bitcoin, which can be stored in any storage medium in isolation. No one can get it except the user himself
low transaction cost: bitcoin can be remitted free of charge, but a transaction fee of about 1 bitfen will be charged for each transaction to ensure faster transaction execution
no hidden cost: as a means of payment from a to B, bitcoin has no cumbersome quota and proceres. If you know the other party's bitcoin address, you can pay
cross platform mining: users can explore the computing power of different hardware on many platforms
advantages
complete decentralization, without issuing institutions, it is impossible to manipulate the number of issues. Its distribution and circulation are realized through open-source P2P algorithm. Anonymity, tax exemption and supervision free. Robustness. Bitcoin is completely dependent on P2P network and has no distribution center, so it cannot be shut down externally. Bitcoin price may fluctuate and collapse, and many governments may declare it illegal, but bitcoin and its huge P2P network will not disappear

cross border. Cross border remittance will go through layers of exchange control agencies, and the transaction records will be recorded by many parties. But if you trade with bitcoin, enter the digital address directly, click the mouse and wait for the P2P network to confirm the transaction, a lot of money will pass. It does not go through any regulatory agencies and will not leave any cross-border transaction records. It's hard for a cat to survive. Because bitcoin algorithm is completely open source, anyone can download the source code, modify some parameters, recompile, and create a new P2P currency. But these counterfeit currencies are fragile and vulnerable to 51% attacks. Any indivial or organization, as long as it controls 51% of the computing power of a P2P currency network, can manipulate transactions and currency value at will, which will be a devastating blow to P2P currency. Many Shanzhai coins die in this link. The bitcoin network is robust enough. If you want to control 51% of the computing power of the bitcoin network, the number of CPUs / GPUs required will be astronomical
disadvantages
vulnerability of trading platform. The bitcoin network is robust, but the bitcoin trading platform is fragile. Trading platform is usually a website, which will be attacked by hackers or shut down by competent authorities. Transaction confirmation takes a long time. When bitcoin wallet is first installed, it will consume a lot of time to download historical transaction data blocks. While bitcoin transaction, in order to confirm the accuracy of data, it will take some time to interact with P2P network, and the transaction will be completed only after the whole network is confirmed

the price fluctuates greatly. Due to the intervention of a large number of speculators, the price of bitcoin for cash fluctuates like a roller coaster. Making bitcoin more suitable for speculation rather than anonymous trading. The public did not understand the principle, and the traditional financial practitioners resisted. Active netizens understand the principle of P2P network and know that bitcoin has no legal person to manipulate and control. But the public doesn't understand, and many people can't even tell the difference between bitcoin and q-coin“ "No issuer" is the advantage of bitcoin, but in the view of traditional financial practitioners, "no issuer" currency is worthless.

5. There are several problems in the development process of bitcoin:
1. Supervision. Decentralization is the biggest advantage and the biggest disadvantage of bitcoin; Because it is easy to be used for illegal trade
2. The problem of trading platform. At present, the domestic bitcoin trading is closed, but the foreign bitcoin trading market is hot and there are many platforms, so it is difficult for users to distinguish the legitimacy of the trading platform
3. As for the transaction risk, the bitcoin development team is only responsible for the development, maintenance and improvement of the bitcoin system, but it is unable to guarantee the normal progress of the transaction
4. As for the identity of the trader, generally speaking, the trading platform authenticates the user's real name, but the coin pack thinks that there are still some loopholes in this kind of authentication
5. Legitimacy. Because different countries have different views on bitcoin, they have different views on bitcoin.

6. 1. MacOS version requirements: click from the top menu of the screen- About local system report... Open the system report app, find the "software" column in the left column and select it. View the system version column on the right:
system version: MacOS
10.12.1
(16b2657)
if your system version is less than 10.12.1, Please check the update and install it through app
store (or download the combined update installation image from Apple support website for manual installation). If you have installed 10.12.1 but the version number is less than 16b26xx, it means that the 10.12.1 you installed is not the latest version. You need to download the combined update installation image from Apple support website for manual installation
MacOS
10.12.1
update content: https://support.apple.com/zh-cn/ht206174
MacOS
10.12.1
combined update download: https://support.apple.com/kb/dl1897? viewlocale=zh_ cn&locale=zh_ Cn
2. To enable the native touch
bar function, you need to use your apple
ID to download Xcode from the app
store (about 15g of disk free space, if you are the developer of MacOS or IOS, Congratulations, you can continue). After installation, open Xcode and select
window show
touch
bar from the menu of Xcode at the top of the screen, You will find that the touch
bar is already displayed on the screen. At this time, you just need to keep Xcode on (which can be minimized). You can experience and use touch
bar as much as you want. Just like the entity touch
bar, you can open the system preferences app, customize your touch
bar display mode in the "keyboard" item, and also customize the buttons on the control bar. You can even choose display custom multi touch
bar from the menu of apps that support custom touch
bar to customize the application control bar. Yes, you now have the full function of touch
bar. The only difference is that touch
bar is directly displayed on the screen. Of course, you have to use the touch pad or mouse instead of touch and click. Finally, you need to find a suitable location for the touch
bar window on the screen
3. Another scenario: if I am an ordinary user and do not want to download Xcode, or the available disk space is not so large, can I not experience touch
bar
of course not. If you can't turn on this function directly, there will always be a big God who can transplant the function to make it run independently. Download a file called
touch é
app
note: the system should refer to point 1, otherwise it will not work. On the other hand, although the two look similar, Xcode turns on calling the native functions of the system,
touch é
it is the version transplanted by Dashen, and its reliability may be slightly poor. You can check the update from time to time to see if there is any repair or improvement (you can also turn on the automatic update function)
finally, of course, there is still a gap between the experience and the entity touch
bar, such as the lack of the function of word selection and association when inputting Chinese. Emoj can only choose the most commonly used one. If you want to have a perfect experience, you are recommended to use a touch
bar device.

7. Brief introction: Zhengzhou Zhongyi Mining Machinery Co., Ltd. (formerly state-owned Henan mining machinery factory) is a high-tech enterprise which is engaged in the development, development, proction and sales of urban construction waste treatment equipment. Its headquarters is located in Zhengzhou City, Henan Province, with a plant area of 15000 square meters. In 2010, the sales exceeded 100 million yuan, of which 10 million yuan was exported. Since its establishment, the company adheres to the scientific management method of modern enterprises, keeps improving, keeps innovating, and develops rapidly. It has become a new star in China's mining machinery instry. On September 8, 2006, it successfully developed and proced the first set of domestic mobile and construction waste treatment equipment, which has been successfully applied in Kunming City, Yunnan Province, There are construction waste treatment demonstration sites in more than 10 provinces in China. Zhongyi mining machinery has become the leading demonstration enterprise of mining machinery instry in Central Plains in response to the requirements of national environmental protection, which has been inspected by provincial and municipal leaders
legal representative: Liu Yongqiang
time of establishment: October 18, 2010
registered capital: RMB 5.18 million
Instrial and commercial registration number: 410183000011904
enterprise type: limited liability company (invested or controlled by natural person)
address: sanlizhuang, xingmi Road, Xingyang City

8. The "defects" of bitcoin as an alternative currency
the concept of bitcoin has a strong inspiration for the existing currency issuance and circulation system, but bitcoin itself can not replace legal currency, not only because of the government's permission, but also because of its own internal restrictions
transaction processing capacity limit. Each block size is limited to 1m, and each transaction is about 250 bytes, so each block can hold up to 4000 transactions. Since the average generation time of each recognized block is 10 minutes, it means that only 7 transactions can be processed per second
with the popularity of blockchain transactions, many transactions have to wait in line to be written into bitcoin blockchain. In turn, the limitation of transaction processing capacity will affect the application scope and scenarios of bitcoin as a digital currency
the underlying cryptographic algorithm may be broken. The hash function selected by bitcoin has collision resistance (if two values cannot be found, X and y, X is not equal to y, and H (x) = H (y), it is said that the hash function h has collision resistance), but there is no hash function in the world with real anti-collision characteristics, but the probability of being broken is very low. The problem is that once it is broken, it means that the security of the whole bitcoin will be fundamentally threatened. By then, bitcoin may be worthless. In fact, this worry alone will affect people's confidence in bitcoin
in addition, the total amount, segmentation and blockchain reward structure of bitcoin will become restrictive conditions at a certain stage of bitcoin development. To solve these problems, we need to release a new basic version. In the distributed architecture, we can not ensure that all nodes update the latest protocol, and the release of the new version will bring the problem of bifurcation
of course, through the introction of strict verification mechanism, the underlying protocol can be updated by tolerating soft forks for a period of time, which will not have a fundamental impact on the value of special currency, but it is not competent to replace legal currency
at present, compared with the positioning of special currency, the consensus reached in the instry is "digital gold" or "quasi digital currency", rather than digital currency. Through the regulation and supervision of the third-party intermediary platform, effective transactions can be concentrated in the field, which can become a new type of investable asset. And its "quasi digital currency" feature is more of the digital evolution of legal money to provide ideas and technical implications, how to talk about substitution
finally, there has been controversy about the anonymity of bitcoin and the risk of money laundering. Indeed, it is one of the core concepts of the bitcoin system not to require everyone to join with their real identities, but bitcoin transactions can not be truly anonymous, and different transactions made by a user with different identities can be eventually traced; The transactions made by third-party service organizations such as bitcoin wallet and exchange are subject to the anti money laundering management of regulatory agencies. In fact, they are all real name transactions.