Bitcoin hash collision team
When you heard that many people who bought bitcoin got rich overnight, Japan also legislated to accept bitcoin, and then the major businesses supported bitcoin payment... You also have grass in your heart. Although I don't know what this coin is, it seems to make a lot of money. Do you want to buy it for two yuan
With a wave of his hand, Mr. Nakamoto, you guys need not worry. In order to make money... Oh no, in order to save the economic crisis, I have already considered this small matter carefully. In order to ensure the authenticity and quantity of each coin, each of us has a small notebook. On this magical notebook, you can see the birth of each coin, and everyone is a witness. At the same time, for the sake of safety, our notebook also has a very cool function, which is to have an invisible lock. You can only see it, but you can't change it. This kind of bitcoin has authenticity and authorityat the same time, you can rest assured that bitcoin will not be used in vain. I have found many "bricks" of mainstream economics, analyzed bitcoin and predicted that it will become the mainstream currency in the future. Now you can dig (Jian) currency without spending a cent, and you can wait for the currency to appreciate. Isn't it super good
this boasting, we listen to the bious, some people go to dig (Jian) money, some keep watching. At this time, Nakamoto took action. In 2014, he secretly united with American e-commerce giants such as eBay, airbnb and Uber, which began to accept bitcoin payment. Since then, the bitcoin market has really begun. Many people know that there is money coming in vain, and they also begin to join the ranks of coin digging. However, the number of people is still small, and there are not many coins g up
until 2017, when the blackmail virus incident occurred and the whole world suffered from large-scale network virus attacks, the poisoning unit had only two choices, either waiting for the computer to GG and the data disappeared, or paying about RMB 2069 bitcoin to unlock
this made bitcoin instantly become global famous. At the same time, all units had no choice but to buy coins. At this time, the brothers who had been digging for (Jian) coins for five or six years had a collective climax. There were so many coins. You want to buy them, right. In this way, the value of pure virtual bitcoin without real value soared to $2151 / piece
since then, as you have heard, XXX has accumulated more than n bitcoins, which have soared ten thousand times and become rich overnight
up to now, the creator of bitcoin, Nakamoto Tsung, has become a fan of identity, but bitcoin is still not accepted by most countries, including China. At present, bitcoin's high trading volume is also an illusion. Most of them are bad speculators. Through high-frequency trading, they create an illusion to attract investors' attention. This practice is equivalent to Taobao's swiping orders
for you who want to invest, you still need to clarify some things
1. Bitcoin is not restricted by law, and of course it is not protected. Once your trading platform is attacked by hackers, your currency will be lost, there will be no place to find it, and there will be no place to reason Many people go to the rooftop)
2. The fluctuation is very great. You only see a ten thousand fold increase, but not a half drop overnight
3, bitcoin has no issuer. In today's financial world, the currency of no issuer is worthless, and the bubble economy may collapse at any time. p>
the last word of advice: don't touch bitcoin as a rookie, or the old bird will speculate and run when they earn money, otherwise they will be sad
1 - data layer: data block, chain structure and time stamp
2 - network layer: P2P network, propagation mechanism, verification mechanism
3 - consensus layer: pow, POS, dpos
4 - incentive layer: issuance mechanism, distribution mechanism
5 - contract layer: script code, algorithm mechanism, smart contract
6-application layer: encapsulates various application scenarios
in the future, jinwowo group will focus on promoting the legal circulation and commercial application of big data with blockchain technology.
Hash algorithm maps any length of binary value to a fixed length of smaller binary value, which is called hash value. Hash value is a unique and compact numerical representation of a piece of data. If you hash a piece of plaintext and change only one letter of the paragraph, subsequent hashes will proce different values. It is computationally impossible to find two different inputs with the same hash value
message authentication code (MAC) hash function is usually used with digital signature to sign data, while message detection code (MDC) hash function is used for data integrity
the basic information of bitcoin network is as follows:
all digital currencies that need to be mined have hash values, such as Laite coin, Ruitai coin, doggy coin, Weimeng coin, Diandian coin, Yuanbao coin, etc< br />
is called ABIS port
BTS and MS
is called um port, that is, air interface
there are actually two interfaces between BSC and MSC, because there is also a TC mole, and the two interfaces are ater port and a port respectively.
in fact, the generation of virtual currency also needs professional development team to develop, and cannot be developed and generated by itself. The development technology of virtual currency is mature, and there is no technical difficulty, but the positioning of virtual currency is the biggest problem, and the generation of virtual currency needs a lot of hardware equipment to mine
it is not a general equivalent, but an expression of value relevance, or a symbol, or a kind of personalized currency. On the other hand, it can also be called information currency. What they have in common is that they are all symbols of uncertain value and relative value. In this case, the traditional meaning of money has been broken. Money in the original sense is only a special case of a new and broader currency. Money can be regarded not only as a general equivalent, but also as a group of symbols of relative value
because the network wide computing power required by this kind of token is not high, the probability of hash collision of the computing power of personal computer can find out the answer in a short time, so as to obtain block rewards. However, this kind of token generally has little value or high risk, so it is not of great significance< br />
extended data:
mining risk:
1. Electricity charge problem:
if the graphics card "mining" needs to be fully loaded for a long time, the power consumption will be quite high, and the electricity charge will be higher and higher. Many professional mines at home and abroad are operated in areas with extremely low electricity charges, such as hydropower stations, while more users can only mine at home or in ordinary mines, so the electricity charges are not cheap. Even in a certain residential area in Yunnan, there was a case of crazy mining, which led to a large area trip of the residential area, and the transformer was burned
2. Hardware expenditure:
mining is actually a competition of performance and equipment. Some mining machines are composed of more such graphics card arrays. With dozens or even hundreds of graphics cards, the cost of hardware and other costs is very high, and there is a considerable expenditure in mining
in addition to the display card burning machines, some ASIC (application specific integrated circuit) professional mining machines are also on the battlefield. ASIC is specially designed for hash operation, and the computing power is also quite strong. Moreover, because their power consumption is far lower than that of the display card, they are easier to form scale, and the electricity cost is also lower. It is very difficult to compete with these mining machines, This kind of machine costs more
3. Currency security:
the withdrawal of bitcoin requires hundreds of keys, and most people will record this long string of numbers on the computer, but the frequent problems such as hard disk damage will make the key permanently lost, which also leads to the loss of bitcoin
4. System risk:
system risk is very common in bitcoin, and the most common one is bifurcation. Bifurcation will lead to a drop in currency price and a sharp drop in mining income
however, many cases show that the forking will benefit the miners, and the forked competitive currency also needs the miners' computing power to complete the minting and trading process. In order to win more miners, the competitive currency will provide more block rewards and handling charges to attract miners. Risk makes miners.
Step 3: find the original installation file of cad2007 and find the simplified Chinese version of AutoCAD2007 in the directory; Bin\ acadFeui\ Program Files\ Root\ Support\ Dfst.dll is deleted manually
finally, restart the computer and re install cad2007. The installation process prompts you "error 1308. Source file not found:...
this method is very good, I hope it can help you!
the steps are as follows
start 360, there is an "advanced" option at the top of the page, and then find the advanced toolset, open the file shredder
Add virus files: Windows & # 92; system32\ fsutk.dll
windows\ system32\ Liprip.dll
and then select "prevent the smashed file from being generated again"
and restart to enter the safe mode, delete windows & # 92; Iprip.exe file
and then run 360 to clean up the malicious plug-ins. After restarting this time, you can start normally
first of all, through continuous practical operation and written learning, I have mastered the professional maintenance knowledge more comprehensively, enhanced the safety awareness, improved the fire fighting ability, on-site equipment operation ability, etc; Support the company's principles and policies, consciously abide by the rules and regulations, concentrate on learning technology, and strive to do their own work better. Secondly, in my work, I have gained a lot of valuable experience and improved my ability in operation and maintenance by anticipating unexpected accidents in the operation of the power station in the past year
I. work summary
1. During the operation of the team, we should actively undertake the obligations and responsibilities of the operators, and have been committed to building an excellent team, and pay attention to coordinating the relationship between the team members, so as to facilitate the development of normal work
2. Since I worked as a hydropower operator on ty, I have worked hard to study and analyze the relevant statements such as the accounts and analysis records of the power station, so as to improve my personal professional skills; In terms of work style, he can abide by the rules and discipline, unite colleagues, be realistic and optimistic, and always maintain a rigorous and serious attitude and meticulous work style. In life, we should carry forward the fine traditions of plain living, diligence, frugality and being ready to help others. We should always be honest and honest, work diligently and live a simple and hardworking life. We should always keep in mind our responsibilities and obligations and be strict with ourselves
3. In the inspection, we strengthen the inspection of equipment, focus on the inspection of important equipment, such as lightning arrester, respirator, bus, clamp, etc., thoroughly check and record the potential safety hazards on the equipment
4. Strengthen the anti Habitual Violation work, effectively control the occurrence of habitual violation< In this year's work, with the joint efforts of our class, we have achieved certain results, and the safety awareness of the staff in each station has been further improved, but some shortcomings have also been exposed:
1. There are some problems in equipment management and foundation, so we need to further strengthen equipment inspection
2. All kinds of records, new operation tickets and work tickets need to be further standardized and improved
3. Due to technical reasons, some defects can not be dealt with in time, which affects the work to a certain extent
4. In practical work, we need to strengthen our efforts to grasp the weak links in safety proction, so as to lay the foundation for future work
work plan in 2011
the general idea of our team's work safety in the past 11 years is to adhere to the basic policy of "safety first, prevention first", further implement responsibilities, do a good job in inspection, and actively explore the establishment of a long-term mechanism for work safety
the overall goal of safety proction is: to fully complete the safety proction indicators issued by our station, resolutely curb the occurrence of major accidents, control the development of minor accidents, maintain the stable development of safety proction situation, and promote the work of the team to a new level
finally, I will continue to study hard, work hard and do my ty well in the future work, so as to better complete the future work.