Which of the following blockchains is Turing complete
zilliqa project's token name is ZIL, which has been circulated and traded on 23 exchanges. Mainstream exchanges such as fire coin and coin an support it, so it is very convenient to participate. ZIL's maximum supply is 21 billion, of which 12.6 billion will be released directly through contracts, and the other 8.4 billion will be released in the form of mining awards within 10 years
the main network of zilliqa will be launched at the end of 2018 or the beginning of 2019, and the mining reward is rich, especially in the early stage. The electric power cost of zilliqa mining is only 1 / 9 of that of Ethereum, so it is more feasible with less energy consumption. In addition, mining can be carried out through GPU graphics card miner, and can simultaneously double dig ZIL and eth, bringing higher benefits for miners
pay attention to "zilliqacn" to learn more about the progress of the project.
1. Lianzhuang data block structure based on blocks
2. Network wide shared ledger
3. Asymmetric encryption
4. Source code open source
blockchain 2.0 era technical basis:
1. Smart contract; It is an application in the blockchain system. It is a business logic that can run automatically by coding. It usually has its own token and special development language
2. DAPP: it includes the user's applications, including but not limited to various cryptocurrencies, such as Ethereum wallet
3. Virtual machine: used to execute the compiled code of smart contract. Virtual machine is Turing complete
with the application and deepening of blockchain technology, the era of blockchain 3.0 has come. The mode of blockchain cooperation can be seen from behind the operation of all walks of life. Therefore, blockchain will change the way of human life widely and profoundly, so the whole life service will enter the era of blockchain. In the process of Internet development, blockchain + physical instry, blockchain e-commerce and blockchain community operation can be applied to blockchain technology
of course, 3.0 came into being with the development of modern cryptography. Today's applied cryptography is the result of cryptography 20 years ago. Therefore, in order to apply blockchain technology to more participation scenarios, especially in Internet economy and other aspects, more verification is needed to verify whether the existing encryption technology can meet the demand, and more in-depth integration of cryptographic frontier technology and continuous innovation are needed.
2017 is the first year of blockchain outbreak, and 2018 will be the first year of blockchain landing
what changes has blockchain brought to the world from 1.0 to 3.0
the development of blockchain can be divided into three stages: point-to-point transaction, smart contract and pan blockchain application Ecology (token economy)
blockchain 1.0 era: the era of digital currency return rate is the king, Digital currency trading is the most important form for people to participate in the blockchain. At this stage, few people really pay attention to the application value of digital currency, let alone the practical value of blockchain technology behind it. People's focus is on the rate of return of digital currency, which is equivalent to buying stocks on another disk. However, this "stock" is more active, and the rate of return is amazing. Of course, it is also full of sorrow
blockchain 2.0 era: smart contract provides infrastructure support for upper layer application development
"smart contract" era, which is the real programmable blockchain, usually represented by "Ethereum", supports Turing's complete scripting language at this stage, It provides the necessary infrastructure for developers to develop any application on the basis of their set "operating system", and realizes the application landing of virtual world. The biggest contribution of blockchain 2.0 is to completely subvert the traditional concepts of currency and payment through smart contracts. In the era of blockchain 2.0, blockchain has formed a trust foundation based on the characteristics of traceability and non tampering, which provides a trusted execution environment for smart contracts and makes it possible for contracts to be automated and intelligent. The biggest difference between the smart contract and the traditional contract is that it is not restricted by the law of the real society. For the contract subject to automatically execute the agreement after triggering the contract terms, However, the arbitration platform no longer judges the execution result in the smart contract, but undertakes the responsibility of execution
blockchain 3.0: the subversion of business lies in the transformation of proction relations
we are now at the junction of 2.0 era and 3.0 era, which can be regarded as an ideal vision for the future virtual digital currency economy, In blockchain 3.0, people can really realize the asset on the chain, build a variety of applications in a large underlying framework, build a platform with no trust cost, super trading ability and extremely low risk, which can be used to realize the increasingly automated distribution of physical resources and human assets around the world, and promote large-scale cooperation in science, health, ecation and other fields
blockchain 2.0 constructs digital identity, smart contract and other infrastructure. On this basis, it hides the complexity of underlying technology, and application developers can focus more on application logic and business logic. That is to say, we have entered the era of blockchain 3.0, which is marked by the emergence of token. Token is the value transmission carrier on the blockchain network, which can also be understood as token or token
the greatest effect of token on human society lies in its transformation of proction relations. Joint stock companies will be replaced, and every actual participant will become the owner of proction capital. This new type of proction relations inspires every participant to contribute his proctivity continuously, which is a great liberation of proctivity. If this kind of business activity is mapped into the inflation of real society, as long as the former outperforms the latter, every token holder will gain over time
it's too early to talk about blockchain 3.0. Although blockchain has gone out of the conceptual stage, the current situation of blockchain technology development is that the underlying technology is not mature enough and the application scenarios are limited. On the one hand, consensus algorithm and other core technologies of blockchain still have room for optimization and improvement; On the other hand, the processing efficiency of blockchain is difficult to meet the requirements of some high-frequency application environments in reality. Moreover, the current mainstream blockchain technology platforms are all originated from abroad. Domestic blockchain technology service providers should patiently start from the bottom development, achieve independent and controllable technology, and strive to lead the development of global blockchain technology, which still needs a certain period of time
the final goal of the competition is to really concentrate on the research of technology and the development of practical application enterprises! According to my observation, among the various applications based on Ethereum, SEC social e-commerce chain has a great chance of landing, which is likely to become a killer application. In the official account of SECblock, weekly weekly reports show that the team is working hard. p>
the people's Bank of China launched the trade finance blockchain platform: widely connecting the information of tax, customs, foreign exchange and other departments, effectively helping SMEs to increase their financing credit
State Grid supply chain financial data sharing platform based on data side chain: provide conditional and reliable sharing service of supply chain financial data under privacy protection, help small and medium-sized suppliers to revitalize accounts receivable, rece financing cost and increase financial income of financial institutions
there are also Guangzhou public law chain, blockchain e-invoice Express Edition, trade finance blockchain platform, blockchain deposit, blockchain traceability and so on. Cipher finance mimacaijing focuses on blockchain information.
(1) distributed ledger, that is, transaction bookkeeping is completed by multiple nodes distributed in different places, and each node records complete accounts, so they can participate in monitoring the legitimacy of transactions, At the same time, they can testify together
different from traditional distributed storage, the uniqueness of distributed storage of blockchain is mainly reflected in two aspects: one is that each node of blockchain stores complete data according to block chain structure, while traditional distributed storage generally stores data in multiple copies according to certain rules. Second, the storage of each node in the blockchain is independent and has the same status, which relies on the consensus mechanism to ensure the consistency of storage, while the traditional distributed storage generally synchronizes data from the central node to other backup nodes[ 8]
no single node can record the account data separately, so as to avoid the possibility that a single bookkeeper is controlled or bribed to record false accounts. In theory, unless all the nodes are destroyed, the accounts will not be lost, so as to ensure the security of the account data
(2) asymmetric encryption and authorization technology, the transaction information stored on the blockchain is public, but the account identity information is highly encrypted, which can only be accessed under the authorization of the data owner, thus ensuring the data security and personal privacy
(3) consensus mechanism is how to reach a consensus among all accounting nodes to determine the validity of a record, which is not only a means of identification, but also a means of preventing tampering. Blockchain proposes four different consensus mechanisms, which are suitable for different application scenarios and achieve a balance between efficiency and security
the consensus mechanism of blockchain has the characteristics of "the minority is subordinate to the majority" and "everyone is equal", in which "the minority is subordinate to the majority" does not completely refer to the number of nodes, but also can be the computing power, the number of shares or other characteristics that can be compared by computers“ "Everyone is equal" means that when the nodes meet the conditions, all nodes have the right to put forward the consensus results first, and then directly recognized by other nodes, and finally may become the final consensus results. Taking bitcoin as an example, the workload proof is adopted. Only when more than 51% of the accounting nodes in the whole network are controlled can a nonexistent record be forged. When there are enough nodes in the blockchain, this is basically impossible, thus eliminating the possibility of fraud.
(4) smart contract, which is based on these trusted and tamperable data, can automatically execute some pre-defined rules and terms. Take insurance as an example. If everyone's information (including medical information and risk occurrence information) is true and reliable, it is easy to carry out automatic claim settlement in some standardized insurance procts
the size of the sensor is 1 / 5.5 inch CCD, which is too small
60g hard disk, is it necessary to make it so large
as a new hard disk recording camera, the technology is not very mature, and there are still many problems, such as the problem of shockproof, the problem of hard disk virus...
although the price is still very attractive, I still think it is more reliable to buy a DV camera in one or two years
the domestic price of sr80 ranges from 6800 to 7200, without invoice
personally, I think sr60 is more cost-effective. 30g hard disk is enough. Sr60 is only about 5700 in China
well, let's see what you can do with this machine. For ordinary household use, 30g of storage space is enough. The recording format is MPEG2. It can record 440 minutes in HQ mode, 650 minutes in SP mode and 1250 minutes in LP mode. Isn't that enough? If you are traveling or scientific research for a long time, I suggest you buy 60g, so that the recording time will be doubled, you can shoot for a long time, and you don't have to import it to the computer frequently
image quality largely depends on the camera lens. Whether it is sr80 or sr60, 1 / 5.5-inch single-chip CCD is very common, and it is not the best t * lens in Zeiss lens. The imaging quality is only average, not as good as the Sony ads boast
Sr1 can support 1080i HD model, 1 / 3 "crystal clear vid CMOS sensor, Carl & Chen 8226; Zeiss vario sonnar t * lens, these are incomparable to SR series
although this Sr1 is sold at around 12000 in China, it's a bit high, but you should be aware of the development trend of the camera field. The era of high-definition has come. CCTV will open three sets of high-definition channels to report the 2008 Beijing Olympic Games
you can't buy a DV in one or two years. In the long run, I suggest you buy Sr1
since you are studying abroad and usually use the camera only for entertainment, there is no need to buy Sr1. Sr60 / 80 is enough
it's OK for camera enthusiast users to choose Sr1
the disadvantages of sr80 are also obvious. No matter how large the hard disk space is, it is limited. When the storage is nearly full, you must find a way to import the material to the computer, and the DV tape can be stored for a long time; In addition, aibvane also said that the hard disk has a certain life span. Once there is a problem with the hard disk, it is difficult to repair it; In addition, the minimum illumination is much higher than the nominal 7 lux, and the shooting effect is not good in dim light or at night
it also has the outstanding advantages of electronic anti shake function; In addition, hard disk storage saves money on DV tape
I checked the official specification sheet of Sony's machine. It is used normally and the operating temperature is 0 ° C to + 40 ° C. Storage temperature: - 20 ° C to + 60 ° C
it is recommended that you use the machine outdoors in bad weather as little as possible, or make a heat preservation cover for the machine to wrap it up, which can protect the machine from the cold to a certain extent.