Virtual currency smart contract
1、 Different definitions:
1. virtual currency:
virtual currency refers to non real currency
digital currency:digital currency is an alternative currency in the form of electronic currency. Both digital gold coin and cryptocurrency belong to digiccy
3. Cryptocurrency:
cryptocurrency is a kind of transaction medium that uses cryptography principles to ensure transaction security and control the creation of transaction units
4. Token (token):
a kind of article whose shape and size are similar to currency, but the scope of use is limited and has no currency effect, and its token is the homonym of token in English
Second, the characteristics are different:1; It can also be said that virtual currency is personalized currency. In another way, it can also be called information currency
2. Digital currency:
is an unregulated and digital currency, which is usually issued and managed by developers and accepted and used by members of specific virtual communities
Cryptocurrency:cryptocurrency is based on the decentralized consensus mechanism, which is opposite to the banking and financial system relying on the centralized regulatory system
4. Token (token):
usually needs to be exchanged for money, used in shops, playgrounds, mass transportation and other places, as a voucher to use services and exchange goods
extended data
at present, digital currency is more like an investment proct, because it lacks a strong guarantee agency to maintain its price stability, and its role as a value measure has not yet appeared, so it can not be used as a means of payment. As an investment proct, digital currency cannot develop without trading platform, operating company and investment company
digital currency is a double-edged sword. On the one hand, the blockchain technology it relies on has been decentralized and can be used in other fields except digital currency, which is one of the reasons why bitcoin is popular; On the other hand, if digital currency is widely used by the public as a kind of currency, it will have a huge impact on the effectiveness of monetary policy, financial infrastructure, financial market and financial stability
The top ten virtual currency trading platforms are: bitcoin China, Ethereum, Monroe, dascoin, reborn, etc.
Bitcoin China (BTCC), the first and largest bitcoin trading platform in China, is operated by Shanghai satuxi Network Co., Ltd., which was established on June 9, 2011. The team members are mainly from China, Silicon Valley and Europebitcoin China provides a reliable trading platform for users to buy and sell bitcoin through RMB
users can also save bitcoin safely in the platform
bitcoin China has achieved the best balance between high security and user convenience
4. Monro (code name XmR) is an open source cryptocurrency founded in April 2014, which focuses on privacy, decentralization and scalability. Unlike many cryptocurrencies derived from bitcoin, monero is based on cryptonote protocol and has significant algorithm differences in blockchain fuzziness
Dash, formerly known as dark coin, is a technical improvement on the basis of bitcoin. It has good anonymity and decentralization. It is the first digital currency with the purpose of protecting privacy. You can feel that it is liked by the black market when you listen to its name The main characteristics of Dashi coin are as follows:1
2. Instant payment function, timely arrival and low handling charge
BTC, usdt, ETH, BCH, LTC mean respectively:
1, BTC
bitcoin. The concept was first proposed by Nakamoto in 2009. According to Nakamoto's idea, the open source software is designed and released, and the P2P network is built on it. Bitcoin is a kind of P2P digital currency. Point to point transmission means a decentralized payment system
2, usdt
TEDA currency is a virtual currency that links cryptocurrency with legal currency US dollar, and is a virtual currency kept in foreign exchange reserve account and supported by legal currency
EthEthereum is an open source public blockchain platform with intelligent contract function, which provides decentralized Ethereum virtual machine to process point-to-point contract through its special cryptocurrency ether
4. BCH
bitcoin cash is a new version of bitcoin with different configurations launched by a small number of bitcoin developers
at 20:20 on August 1, 2017, bitcoin cash starts mining, and each bitcoin investor's account will have the same amount of bitcoin cash (BCH)
5, LTC
litecoin, abbreviated as LTC, currency symbol: & # 321;; It is a kind of network currency based on "peer-to-peer" technology. It is also an open source software project under MIT / X11 license. It can help users make instant payments to anyone in the world
source of reference: network bitcoin
source of reference: network TEDA coin
source of reference: network Ethereum
source of reference: network bitcoin cash
source of reference: network letcoin
source of reference: Network
They are:
bitcoin
the concept of bitcoin was first proposed by Nakamoto in 2009. According to Nakamoto's ideas, the open source software was designed and released, and the P2P network was built on it. Bitcoin is a kind of P2P digital currency. Point to point transmission means a decentralized payment system
bitcoin cash
bitcoin cash is a new version of bitcoin with different configurations launched by a small number of bitcoin developers
extended data:
virtual currency refers to non real currency. Well known virtual currency, such as network company's network currency, Tencent company's Q currency, Q point, Shanda company's voucher, Sina's Micro currency (used for micro games, Sina reading, etc.), chivalrous Yuanbao (used for chivalrous road game), silver pattern (used for bixue Qingtian game)
the popular digital currencies in 2013 are bitcoin, Leyte coin, infinite coin, quark coin, zeta coin, BBQ coin, pennies (Internet), invisible gold bar, red coin and prime currency. At present, hundreds of digital currencies are issued all over the world. Popular in the circle & quot; The legend of "bitcoin, Wright silver, infinite copper, pennies aluminum"
virtual currency can be used for shopping transactions in certain situations, such as in some places abroad; At this time, it counts as a token and plays the role of currency
but token, such as the shopping card voucher printed by the company itself, can be used for the internal consumption of the company. To some extent, it is equivalent to token; However, it is not a virtual currency
that is to say, virtual currency may be token; But token is not necessarily a virtual currency.
(1) blockchain
since 2013, virtual currency has graally attracted people's attention, and even set off a wave of upsurge of virtual currency. However, many people do not know that the real value is the background technology of virtual currency - blockchain. Virtual currency is only one of the most original applications of blockchain technology, and its rise has brought about a lot of problems, There is also an inevitable reason, that is, blockchain technology endows them with the core characteristics of fairness, impartiality and openness. The practical application of virtual currency is very few, and there is no real value support. Even some virtual currencies recognized by many countries are occasionally traded, not to mention applied. Most of them are just doing price speculation, leading to the price of virtual currency fluctuating, Extremely unstable, because of its price instability, it can not become a real currency. It is precisely because blockchain has the technology gene of fairness, impartiality and openness that almost all banks and financial institutions around the world are studying and using blockchain technology, including UBS, Citigroup, the Federal Reserve, the Bank of England, the Central Bank of China and so on. Why is blockchain so popular? Because it fundamentally enhances the banking instry, supply chain, property management and other trading networks, It is considered to be the core technology with the most potential to trigger the fifth round of disruptive revolution after steam engine, power information and Internet technology 2) (2) smart contract
these advanced applications of blockchain are called "smart contract". Smart contract is the core application that can really bring revolutionary progress. You will find that smart contract is becoming the mainstream of the market, and we will soon enter the era of smart contract
(3) quantum technology
in such a developed world of Internet, how to ensure your information privacy, how to ensure the security of your online banking password, chat records, virtual currency and everything that needs a password, all these are e to the public key and private key encryption algorithm widely used in the current Internet. If this algorithm is decrypted by the current computer, It's almost impossible to complete the task, and it often takes tens of thousands of years or even longer to decrypt. However, within 5-10 years, quantum computers will appear. When quantum computers are used to decrypt, these passwords will only take a few seconds to be decrypted. Our bank funds, social information, and virtual currency will not be safe. Therefore, we can't use quantum computers to decrypt, At present, the research against quantum decryption has become a global hot spot, including the pqcrypto and safecrypto research program supported by the European Union, the crest crypto math research program of Japan, and so on. Major enterprises have also expressed their views, such as Intel's quantum chip, Google's quantum encryption, and quantum communication technologies actively encouraged by governments, So quantum technology is the best future technology. It is not only a spear, but also a shield. It can subvert our current security system and bring us super efficient computing solutions.
will not be replaced. Another important reason is that as long as one pixel of 3D code is damaged, or the color presents chromatic aberration, it may be unable to read. But now there are many electronic procts, chromaticity is not the same, there will be color difference, so it is difficult to identify. However, the QR code will not have such a situation, sometimes even some damaged information can be read completely, which does not affect the use of . So compared with the two-dimensional code, its practicability is not very strong
Although the idea of collecting patent fees from Chinese people could not be realized, Teng Hongyuan did not attach importance to the invention at the beginning, so Chinese inventors improved the QR code, which also promoted the spread of QR code in China. Three dimensional code is really good, but because both businesses and users are used to two-dimensional code, it is almost impossible for three-dimensional code to replace two-dimensional code in a short time< after all, although 3D code is better than 2D code, 3D code also needs to be swept. So even if 3D code can replace 2D code, it is estimated that it will be many years later. After all, it takes a long time for users to get used to itbut there is no problem, so it can not be determined
few investors and poor liquidity; Lack of supervision and serious manipulation.