Bitcoin 1 minute
Bitcoin is a kind of network virtual currency. Bitcoin network generates new bitcoin through "mining". In essence, the so-called "mining" is to use computers to solve a complex mathematical problem to ensure the consistency of bitcoin network distributed accounting system. Assuming that the mining computing power is 100 mhash / s and the total computing power is 4000 ghash / s per day, 3600 bitcoins can be g out every 24 hours
China's computing power has accounted for more than 75% of the world, that is to say, 75% of bitcoin in the world is made in China. How long does it take to dig a bitcoin
bitcoin used to be very good at "digging", which can be done by ordinary computer CPU, and it can automatically "solve problems" by downloading software. But with the rise of currency price, more and more people want to "solve the problem", and the difficulty of mining is also increasing. Now, the amount of computation needed to dig a bitcoin is beyond the reach of ordinary people. Ordinary computers can't afford it
instry insiders said that in 2014, 100 bitcoins were generated from 500000 yuan of electricity charge per day, and the cost of electricity charge alone was 5000 yuan per coin. But now, the same cost has more than doubled, and the electricity cost of each bitcoin is as high as 10000 yuan
in the generation mechanism of bitcoin, mining reward is decreasing. At the beginning of the birth of bitcoin, the miners could get 50 bitcoins for each page of the ledger, and then 25 bitcoins for each page of the ledger, decreasing in turn. It's like digging gold. At first, it's more and less. The time point at which each new reward is reced by half is called half bitcoin proction
assuming that the mining computing power is 100 mhash / s, the total computing power is 4000 ghash / s per day in 2014, and 3600 bitcoins are g out every 24 hours
now, we can understand the difficulty of bitcoin digging in this way, which is equivalent to 100 million dice throwing numbers less than 100 million and 50 million. Whoever throws them first will get the bookkeeping right. At this point, 1050 million is a hash value. The process of throwing dice is called hash collision. The unit of mining power is the number of hash collisions per second
at present, the computing power of bitcoin in the whole network has reached 2.36 billion hash collisions per second, which is equivalent to the number of water droplets in more than 200000 50 meter long standard swimming pools. But even with such a large amount of computing power, it will take about 10 minutes to hit a hash value that meets the requirements
in 2012, bitcoin's output was halved for the first time, and in July 2016, bitcoin's output was halved for the second time. At present, 12.5 bitcoins are awarded for recording one page of account book. The next halving will take place around 2020, and the total number of bitcoins will not increase by 2040, with a total of 21 million
Related videos: how long does it take to dig a bitcoin
playing this game is essentially the same as gambling, and it's easy to be manipulated. It's better not to play.
a block is a record in the block chain, which contains and confirms the transactions to be processed. On average, a new block containing transactions is added to the block chain by mining every 10 minutes
Puyin, Laite coin, doggy coin and Ruibo coin all have their own blocks, and the transaction information will be recorded on the blockchain.
As we approach the end of the year, when we plan to sprint for the goal of the end of the year, earn more bonus and prepare to release ourselves in the Spring Festival, don't forget that the fraudsters also have such a plan. At this time, the tide of shopping on double 12 and new year's day comes one after another, and people working outside are also busy booking tickets and air tickets for the Spring Festival, which provides opportunities for fraudsters. Here, liewang, the first online fraud information reporting platform linked by the police and the people in China, makes an inventory of the new trends of online fraud in 2017. Can you see through all these scams
trend 1: mobile payment has become the mainstream, beware of two-dimensional code trap
mobile payment has greatly facilitated people's life and made people travel easily. However, there are many criminals who use the way of scanning two-dimensional code to carry out fraud, which is impossible to prevent. For example, on bike sharing, a fake QR code is used to cover the regular QR code, and the avatar is set as the official icon of bike sharing to cheat users to pay or recharge; Next to the store's two-dimensional code, there are words full of temptation, such as "scan code to grab red packets", "scan code discount", etc., to lure users to scan the code, and then obtain user information or directly guide users to transfer money. There are even criminals who the illegal parking notice posted on the car by traffic police. The fake ticket is attached with a payment QR code to lure the car owner to scan the code to pay a "fine"
trend 2: fake businesses want to refund. Users should be careful of being" loaned online "
generally, people think that their bank card balance is small, even if they encounter swindlers, it doesn't matter. However, according to the report cases received by liewang platform, In the common refund fraud in 2017, fraudsters use mobile phones to receive SMS verification code to lure victims into Internet micro loan business, and finally transfer the loan to the swindler's account. This kind of fraud often involves a high amount of money and brings serious property losses to users
trend 3: mobile phones also contain extortion virus, and the payment method is more" people-friendly "
mobile phone extortion software has become a common tool for criminals to seek benefits e to its low proction cost and fast cash flow. At present, there are different forms of blackmail software in the mobile application market. Different from the blackmail software in the computer, bitcoin is needed to pay for it. The payment form in the mobile blackmail software is more "people-friendly"
a batch of blackmail software captured in 2017 attached wechat two-dimensional code information to the blackmail interface, and prompted the winner to directly scan the two-dimensional code for payment by wechat, which will automatically unlock after successful payment, and the user will automatically enter the transfer interface after scanning the code. However, through technical analysis, this kind of blackmail software does not have any code related to wechat transfer. The so-called "scan payment, automatically unlock" is actually a fraud, even if the user transfers, it will not automatically unlock
trend 4: fake customer service requests to provide payment code and swipe only by numbers
because code scanning payment is simple and convenient, in 2016, many fraudsters took a screenshot of the two-dimensional code to swipe. But in 2017, as payment companies added anti fraud tips or confidentiality settings in the process of payment QR code screenshots, swindlers immediately thought of countermeasures and swindled the numbers under the payment code, forming a new instrial chain
criminals often disguise themselves as merchants customer service, requiring users to provide figures such as Alipay, WeChat and other payment bar codes, and then, on the grounds of digital failure, require users to refresh the numbers and send them several times to achieve the purpose of stealing. p>
trend 5: download the specified software, but the account password is shared by cloud disk
users' privacy information can be stolen without using phishing websites and Trojan horse software. This year, swindlers have come up with new tricks: as long as the victims' trust is obtained, they can download cloud disk, synchronization software and other procts, log in to the account designated by the swindler to upload files and synchronize, and then they can easily get information. What's more, if the user synchronizes the SMS verification code at any time, the swindler can easily steal the funds in the bank card
fraudsters often disguise themselves as e-commerce, suppliers and other customer services, requiring users to download some cloud disk synchronization software, and then provide the specified account password for users to log in. At this time, if the user logs in and synchronizes the personal account, password and other information on the software according to the swindler's instructions, the funds on the account will be transferred quietly
trend 6: new phishing websites on mobile terminals are more covert and easy to be recruited
as security manufacturers increase their efforts to crack down on phishing websites, phishing website makers also strengthen their covert means, spread links by using proct sharing functions such as short URL, cloud disk service, browser and social tools, and finally jump through the URL, Guide users to phishing sites to launch online fraud
trend 7: indemnity should be paid in intimate way. Be careful with this kind of fraud SMS
as early as 2013, 360 company discovered a high-risk fraud binding the victim's online banking account. In recent years, with the use of mobile payment becoming more and more popular, In 2017, there was a similar kind of fraud, which used a payment platform to bind accounts and swipe victims' accounts
in May 2017, Mr. Di received a flight delay text message sent in the name of the airline, with flight information and customer service phone number attached in the text message, and said that Mr. Di could get 300 yuan of delay compensation. Fake customer service in the phone to guide Mr. Di refund operation, and provide the enterprise account, but also ask Mr. Di to open intimate payment function. However, after Mr. Di opened, he found that he had two dections, and realized that Mr. Di was cheated and immediately called the police
trend 8: investment in the circle of friends? Do not gambler psychology
in everyone's wechat group or circle of friends, there are often many activities or proct recommendations under the banner of discount. Not long ago, Mr. Wang saw a WeChat official account named "double half price win" in WeChat group chat. Mr. Wang then identified the official account as having an enterprise certification and believed that the platform had high credibility. p>
Mr. Wang invested a small amount in the early stage, and found that there was a certain income every day, so he subsequently invested in batches, but graally began to lose money“ He wants to invest more in order to earn back the capital. As a result, when contacting customer service again, he found that the other party had blackmailed him. Only then did he realize that he had been cheated and that the money he had invested had gone to nothing
trend 9: identity impersonation has a new pattern, be careful that "friends" are high imitations
in the past, online fraud of identity impersonation often occurred on QQ, wechat and other social platforms, but this year, swindlers shifted their focus to microblog. The swindler specially studies the social habits of the victims, such as the relationship between microblog staff and chat content, and then changes their avatars and nicknames to create high imitation numbers. Because most of the fake users are abroad, it is difficult for their microblog friends to distinguish the true from the false in time
trend 10: the combination of various means makes it impossible to prevent the" ghost "fraud.
in March 2017, 360 assisted the Shenzhen police in successfully cracking down the" midnight ghost "Telecom fraud Gang, which the police identified as an illegal trade instry chain relying on personal information, It is a high-tech, high intelligence, cross platform, remote-control new type of telecom network fraud crime that combines mobile cloud service, operator's deputy number service and Internet financial service. And this kind of stealing brush mainly uses different services of various platform service providers. A single service does not have the security risk of stealing brush, but it is combined to form stealing brush. In order to make it difficult for the victims to detect, the criminals choose to commit crimes late at night. The whole process does not need to have any contact with the victims, and the victims do not need to reply to any SMS, so prevention is very difficult
from the above ten cases, the current situation of network fraud is still not optimistic. The anti fraud experts of liewang platform hereby remind the netizens that the new year is approaching, the fraudsters are highly active, and all kinds of fraud means emerge in endlessly. At this time, we need to improve the anti fraud awareness, so that the fraudsters have no chance to take advantage of it
net hunting platform is jointly launched by Beijing Public Security Bureau and 360. It is an innovative platform to crack down on Internet fraud through Internet platform and Internet technology. Up to now, liewang platform has established contact with public security organs in more than 300 regions of the country, helped to detect more than 100 major Internet fraud cases, involving 170 million yuan, and knocked down more than 10 large-scale fraud gangs with strict organization and clear division of labor. Internet users can report malicious programs, malicious web addresses, fraulent phone calls, etc. to 360 Internet security center through the platform. Every piece of information reported by Internet users will be included in the big data of liewang platform, providing effective clues for the police to solve cases