Black Coin mining
the feature of sha256 algorithm used in bitcoin is that it's easy to verify the known answers correctly, but it's very troublesome to get the answers, and you need to try them one by one. The miner who got the answer first was recognized by everyone as having snatched the right to keep accounts, and the reward was given to him. Let's continue to grab the bookkeeping right of the next question
simply speaking, the significance of these calculations only lies in ensuring the stability and security of the whole system, and has no more significance. It is not comprehensive to regard bitcoin as a by-proct of computing. The generation and issuance of bitcoin, all the transactions and circulation in the bitcoin chain, and the stability of the bitcoin system are all the purposes of computing. Of course, in addition to maintaining the system, it does not proce other value and procts. This is also a black spot where bitcoin is accused of not being environmentally friendly and wasting resources
in general, bitcoin, as a milestone blockchain digital currency, comes from the huge value of a large amount of computing power investment and user trust. There is no doubt about that.
BCC mining and bitcoin mining are the same, the only difference is the dynamic mining strategy
when BCC was just born, it continued the mining difficulty of BTC. The miners lost money for mining out of belief. At the beginning of bitcoin's birth, they even proced a block within 12 hours. In order to ensure the stable development of BCC network, BCC adopted the strategy of dynamic adjustment of mining difficulty, which can ensure that the block speed of BCC can well adapt to the decline of computing power
BTC is a difficulty adjustment for every 2016 blocks, while BCC adds a rule of "if the MTP interval of the past six blocks is greater than 12 hours, the next difficulty will be reced by 20%". At present, the mining difficulty of BCC has been reced a lot, which is about 13% of that of BTC. BCC's current block speed is close to an average of 10 minutes out of a block
mining principle of BCC:
the previous life of BCC was bitcoin. Before the bifurcation, the data stored in the blockchain and the running software were compatible with all bitcoin nodes. After the moment of bifurcation, it began to execute new code and package large blocks, thus forming a hard bifurcation on the chain. At present, BCC is still a futures, which will be officially split into a new currency on August 1
security problems faced by bitcoin:
the first security threat of users comes from the user activated hard fork or uahf - all BTC holders who control their private key get an equal number of BCCs at the time of fork
that's the problem: there are many domestic trading platforms designed for bitcoin, but it should be noted that many investors use third-party transactions or unsupported software wallets, but the investors themselves do not control their private keys, so it is the third-party trading platform that finally receives the new currency. Some platforms will inform customers, while others will not
many investors have transferred their assets to the supported bitcoin wallet a few hours before the hard fork, while investors without independent wallets have to wait
there are many opportunities for phishing attacks or other malicious attacks, especially considering that most successful malicious attacks against bitcoin are focused on controlling private key or hacker exchange, rather than directly attacking currency. About the security of bitcoin, you can also add your own wechat seciot to communicate
BCC is very similar to BTC in technology, adding greater blocking and transaction replay protection, and the latter is in a new form of signature. Bitcoin cash transactions use a new sight_ Fork ID, which prevents bitcoin cash transactions from being replayed on bitcoin blocks
the new hash signature also brings additional benefits, such as the input value signature improves the security of hardware wallet and eliminates the second hash problem. In short, it is theoretically safer than BTC, and its purpose is to start and use faster and more convenient
However, BCC does face a major threat, that is, most attacks, that is, the security risk of a single entity acquiring more than 51% of the network processing power. At the same time, the common enemy shared by the two blockchains is interrupt attack. Most attackers use network interrupt to split the network to improve the probability of successat the same time, partition network and network delay attack are threats. According to the latest research paper, for the so-called distributed network, it is easier than assumed, and 20% of bitcoin nodes are hosted in less than 100 IP prefixes
the most important thing is that the ITGC client has built-in one click mining! One click mining! One click mining! Important things are to be repeated for 3 times. For Xiao, in fact, mining is not so difficult, as long as there is a computer, a mobile phone can, today teach you a key mining
first of all, we need to download ITGC's wallet client. We can search eppool, Download professional mining tools, and now support PC's win, Linux, MacOS's CPU and graphics card mining, as well as Android mobile phone mining! The second step is to download the official wallet client. After downloading and installing, we start ITGC wallet. Step three, start mining Mining command] enter go and enter to start your mining journey. It's so simple! It's amazing!
Mining bitcoin is also called mining. Starting from the essence of bitcoin, the essence of bitcoin is actually a special solution generated by a bunch of complex algorithms. A special solution is one of the infinite (in fact, bitcoin is finite) solutions that can be obtained from the equations. Every particular solution can solve the equation and is unique
in the metaphor of RMB, bitcoin is the serial number of RMB. If you know the serial number of a note, you have the note. The process of mining is to constantly seek the special solution of this equation system through a huge amount of calculation. This equation system is designed to have only 21 million special solutions, so the upper limit of bitcoin is 21 million
bitcoin: also known as "bitcoin", is a kind of network virtual currency. Internet users can use bitcoin to buy some virtual goods, such as clothes, hats, equipment, etc. in online games. Internet users can also use bitcoin to buy real goods
extended data:
shortcomings
first, the 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
Second, the transaction confirmation time is long. 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 Thirdly, 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 Fourthly, 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 worthlessin the very early days, when the computing power of bitcoin was very low, the computer could also carry out a lot of calculations according to the algorithm to "mine" bitcoin
when users "mine" bitcoin, they need to search for 64 bit numbers by computer, and then compete with other gold miners by repeatedly solving puzzles to provide the required numbers for the bitcoin network. If the user's computer successfully creates a group of numbers, they will get the bitcoin awarded by the block. However, e to the rising value of bitcoin, the number of users of bitcoin mining is very large. There are millions of professional mining machines mining at the same time, and the output of bitcoin is very limited every 10 minutes. As a result, tens of millions of people scramble for a block. Therefore, if you use personal computers to mine alone, you may not be able to grab a block in a whole year, People came up with a method of group mining, so the mining pool was born. There are a lot of users who play after mining
I hope you will adopt it.
Before we learned a simple price situation of enamel steel plate, this time, Xiaobian will take you to have a more in-depth understanding of the proction process of enamel steel plate. We mentioned that enamel steel plate is a kind of composite material, so the proction process is relatively more complex, but its material performance is good, and its appearance is also good-looking, which can be used in many different places. Then come to understand the proction process of this enamel steel plate
I. conditions of enamel steel plate
1. The carbon content is 0.08 ~ 0.12%
2. The surface structure is uniform
3. It is suitable for stretch forming, not easy to crack and wrinkle
4. It is suitable for welding, easy to clean
5. It is not easy to deform and bend ring firing. At present, the commonly used plates and models in China are Baosteel btc1, Maanshan spcc-1dc01, etc
Second, the glaze should have a wide range of firing temperature and resistance to firing, and the coefficient of thermal expansion is appropriate, After firing, it is not easy to proce cracks and deformation5. It has certain explosion-proof performance
the grinding additive and function of glaze formula
1, clay 2, quartz 3, electrolyte (nitrous borax)
the function of clay:
1 as the suspending agent of glaze, plays a suspending role
2, Clay can affect the physical structure and expansion coefficient of enamel ring sintering. Clay can change the covering power, whiteness and luster of enamel. Electrolyte: nitrite: antirust effect. Generally, 0.2-0.5% borax is used as melting aid. The standard thickness of steel plate enamel is 80-120um, The primary glaze is 120 ~ 150um
surface glaze: the surface glaze is divided into base glaze and titanium glaze
the base glaze is mainly used for color matching, the base glaze needs to have good luster and porcelain surface, glue resistance, and it is not easy to proce glue film after Decal
the white glaze needs to have good hiding power and luster, Acid resistance
the thickness of surface glaze is generally 150 ~ 200um
test index and method of glaze slurry:
1 particle size (coarse and fine) 2 specific gravity (solution weight) 3 retention (adhesion)
glaze slurry particle size test
take 50ml glaze slurry and wash it with 200 mesh screen water, After the resial porcelain powder is dried, the following results can be obtained:
standard particle size: down lead: 6-8g surface glaze: 3-5g colored glaze: 2-4G
specific gravity:
take 100ml glaze slurry into a Pycnometer (set bottle weight 50g), The total weight minus the bottle weight can be obtained as follows:
specific gravity requirements: pot cover: down lead 169-170g / 100ml surface glaze: 172-174g / 100ml colored glaze: 172-174g / 100ml
pot body: down lead 166-167g / 100ml surface glaze: 167-169g / 100ml colored glaze: 167-169g / 100ml
adhesion test:
take the plate thickness of 1mm, length and width of 100cm × 10cm stainless steel sheet (set weight as 50g) is placed in the glaze slurry after mixing, and the glaze slurry does not continue to drop until it is lifted vertically (not fast or slow). After weighing and recing the weight of stainless steel sheet, the adhesion amount is
pot cover: downward: 12g / 10 × 10cm white glaze: 14g / 10 × 10cm color glaze: 14g / 10 × 10cm
pot body downward: 7g / 10 × 10cm white glaze: 9g / 10 × 10cm color glaze: 9g / 10 × 10cm
aging of glaze slurry:
the glaze slurry needs to be aged for 36-48 hours before use, which is very important. It can improve the working properties and operating performance of glaze slurry, but if the aging time is prolonged, it will be harmful to the properties of glaze slurry, The surface glaze is generally added (potassium carbonate + magnesium sulfate). Before use, take a small amount of glaze slurry and adjust the thickness. Add the thickness adjusted glaze slurry into the glaze slurry to be adjusted, so as to avoid small bubbles and affect the performance of glaze slurry
In order to improve the unevenness of enameling powder, it is better to adopt natural dripping operation, so as to achieve uniform thickness, rationalization of action, standardization of operation, and save physical strength, so as to rece the defect rate, improve proct quality, rece the amount of glaze slurry, and save cost, Generally follow the principle that the proportion of large procts is slightly lower, the proportion of small procts is slightly higher, and the cover is slightly higher than the pot body2 gesture should be consistent as far as possible, the bottom should be swung 4-5 times, and the two sides should be swung about 2 times, and the force should be subject to the swing of the penlum.
3 when soaking the pot body, it should be 360 degrees to the edge of the pot, not to the bottom, so as to avoid the horizontal bar or too thick bottom, The manufacturing process of enamel steel plate is relatively complex, so we pay attention to the accuracy of hand gestures in the process of firing and enamelling. The accuracy of hand gestures can save the beauty of the finished proct and the amount of raw materials. In addition, in the manufacturing process of enamel steel plate will encounter some more difficult to solve problems, these problems depend on everyone's experience in the actual operation to improve his practice
nowadays, warrants in the market are all by-procts derived from related separated convertible bonds. In fact, warrants are equity warrants, which can increase the share capital of listed companies and are distributed by listed companies to relevant securities holders; In addition, there is another issuance method. This issuance method generally refers to the issuance of relevant warrants of the listed company by a third party other than the listed company. This warrant can not increase the equity nature of the listed company. Generally speaking, this issuance method is that the relevant innovative securities companies can issue relevant covered warrants as issuers (this issuance method is very common in foreign countries), However, the Securities Regulatory Commission does not allow the issuance of such warrants. However, in the near future, the emergence of such warrants in the securities market will be a major trend. Generally speaking, these warrants are not distributed, and investors are required to buy them from the relevant issuers. These warrants can be traded in the market. In addition, the issuers should provide a trading quotation as a market maker, Because this kind of warrant involves many related problems, there are no related warrant varieties in China's relevant warrant market, but the relatively new issuance conditions are only limited to the emergence of listed companies issuing their own related warrants
in the past, covered warrants were issued by major shareholders of relevant listed companies as issuers to tradable shareholders as consideration for share reform e to share reform.