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㈠ What framework is used to develop blockchain Substrate

Blockchain development is very complicated. It involves complex technologies (including advanced cryptography and distributed network communications) that you must master in order to provide a secure platform for applications to run and users to trust. There are also thorny issues to resolve around scale, governance, interoperability and scalability. This complexity creates a high barrier for developers to overcome. With this in mind, the first question to answer is: What do you want to build?

Substrate is not perfectly suitable for every use case, application or project. However, if you want to build a blockchain, Substrate may be a perfect choice.

Substrate is a software development kit (SDK) designed to provide you with the basic components of all blockchains, allowing you to focus on crafting the logic that makes your chain unique and innovative. Unlike other distributed ledger platforms, Substrate is.

Most blockchain platforms have very tightly coupled, unanimous subsystems that are difficult to decouple. There are also risks on a chain based on a fork of another blockchain, where these very obvious couplings can fundamentally break the blockchain system itself.

Substrate is a fully modular blockchain framework that lets you compose a well-defined Chains of decoupled components.

With Substrate, you can deploy a blockchain designed and built for your specifications, but also able to evolve with your changing needs.

All Substrate architecture and tools are provided under an open source license. The core components of the Substrate framework use open protocols such as libp2p and jsonRPC, while empowering you to decide how much you want to customize the blockchain architecture. Substrate also has a large, active, and helpful community of developers contributing to the ecosystem. Contributions from the community enhance the capabilities available, allowing you to incorporate them into your own blockchain as it evolves.

Most blockchain platforms offer limited capabilities to interact with other blockchain networks. All Substrate-based blockchains can interoperate with other blockchains through Cross-Consensus Messaging (XCM). Substrate can be used to create a chain as a standalone network (single chain), or tightly coupled with a relay chain to share its security, as a quasi-chain.

Substrate is built to be scalable, composable, and adaptable. State transition logic--Substrate runtime--is an independent WebAssembly object. Nodes can be given the ability to completely change the runtime itself under certain conditions, inducing runtime upgrades network-wide. Therefore, "forkless" upgrades are possible because in most cases nodes do not need to take any action to use this new runtime. Over time, the network's runtime protocols can evolve seamlessly, perhaps radically, with the needs of its users.

㈡ What is the concept of blockchain

Concept: Blockchain is a new application model of computer technology such as distributed data storage, point-to-point transmission, consensus mechanism, and encryption algorithm.

The essence of the blockchain is a distributed public ledger. Anyone can verify this ledger, but no single user can control it. Participants in a blockchain system jointly maintain a ledger: it can only be modified according to strict rules and consensus.

The development of blockchain has gone through three stages:

1. Incubation period: 2009-2012, the economic form was dominated by Bitcoin and its industrial ecology.

2. Embryonic period: The period is from 2012 to 2015. Blockchain entered the public eye with Bitcoin, new wallet payment and remittance companies appeared, and the blockchain economy spread to the financial field. The underlying technology of blockchain continues to innovate. Blockchain technology is divorced from the Bitcoin system.

3. Development period: In 2016, industry applications began to be explored, and a large number of blockchain startups emerged. The popularity of ICO in 2017 brought unprecedented attention to blockchain.

(2) Extended reading of sdk golden encyclopedia in blockchain:

Three characteristics of three blockchains:

1. The core idea of ​​the blockchain is decentralization: in the blockchain system, the rights and obligations between any nodes are equal, and all nodes have the ability to vote with computing power, thus ensuring the The recognized result is the result recognized by more than half of the nodes. Even if it suffers a severe hacker attack, as long as the number of nodes controlled by the hacker does not exceed half of the total number of global nodes, the system will still be able to operate normally and the data will not be tampered with.

2. The biggest disruption of blockchain lies in the establishment of credit: in theory, blockchain technology can make WeChat Pay and Alipay no longer valuable. The Economist made a vivid metaphor for blockchain: simply put, it is “a machine that creates trust.” Blockchain allows people to collaborate without trusting each other and without a neutral central authority. Combating counterfeit currency and financial fraud will no longer be needed in the future.

3. The collective maintenance of blockchain can reduce costs: In a centralized network system, the maintenance and operation of the system rely on the operation, maintenance and operation of platforms such as data centers, and costs cannot be omitted. The nodes of the blockchain can be participated by anyone, and every nodeWhile participating in the recording, it also verifies the correctness of the recording results of other nodes, which improves maintenance efficiency and reduces costs.

In one sentence, blockchain touches money, trust and power, which are the fundamental foundations on which human beings rely for survival.

㈢What is blockchain

What is blockchain? What changes will it bring to your future life?

Blockchain is a new application model of computer technologies such as distributed data storage, point-to-point transmission, consensus mechanism, and encryption algorithm.

Blockchain is an important concept of Bitcoin. It is essentially a decentralized database. At the same time, as the underlying technology of Bitcoin, it is a series of cryptographic methods related to each other. Each data block generated contains a batch of Bitcoin network transaction information, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block.

In fact, the original English version of the Bitcoin white paper does not appear in the word blockchain, but uses chain of blocks. In the earliest Chinese translation of the Bitcoin white paper, chain of blocks was translated into blockchain. This is the earliest time when the Chinese word "blockchain" appeared.

The Cyberspace Administration of China issued the "Blockchain Information Service Management Regulations" on January 10, 2019, which will come into effect on February 15, 2019.

In a narrow sense, blockchain is a chain data structure that combines data blocks in a sequential manner in chronological order, and is cryptographically guaranteed to be non-tamperable and non-transformable. Fake distributed ledger.

So in conclusion, this is undoubtedly a new technology that changes life. In the future, the production activities of the entire society will be carried out with blockchain as the underlying logic. Many things We all have it at our fingertips, and with the integration of artificial intelligence and big data, we can easily handle things that may seem cumbersome now, such as some securities market transactions and intelligent matching of financial management activities.

To put it simply, blockchain is a network computing center that integrates people, property, machines, and goods, and packages them into a whole; putting it on an infrastructure to run.

㈣ What does usdk coin mean?

This article aims to explore what usdk coin means. First of all, this article introduces the concept of usdk currency, which is a new type of cryptocurrency, a digital currency based on blockchain technology, and has the characteristics of autonomy and decentralization. Secondly, this article introduces the development history of usdk currency, as well as its characteristics and principles. Finally, this article summarizes the advantages of usdk currency, as well as the structural encounters and challenges it brings to users.

1. The concept of usdk currency

2. The development history of usdk currency

3. Characteristics and principles of usdk currency

4. Advantages of usdk currency

5. Opportunities and challenges that usdk currency brings to users
< br />This article studies what the usdk currency means, introduces its concept, development history, characteristics and principles, as well as the opportunities and challenges it brings to users. To sum up, usdk currency is a new type of cryptocurrency with the characteristics of autonomy and decentralization. It provides users with more investment opportunities and challenges.

What does usdk coin mean?

With the development of financial technology, a new type of cryptocurrency usdk coin has also emerged. usdk coin is a digital currency based on blockchain technology, which is autonomous and decentralized. It is a new type of investment product that provides users with more investment opportunities and challenges.

1. The concept of usdk currency

usdk currency is a digital currency based on blockchain technology. It is a decentralized cryptocurrency whose issuance is not Under the control of any central agency and not regulated by any country. It is autonomous and can trade freely on the Internet without geographical restrictions.

2. The development history of usdk currency

The development of usdk currency began in 2009, when Satoshi Nakamoto invented Bitcoin. Bitcoin is a blockchain-based The issuance of digital currency based on chain technology is not controlled by any central agency or regulated by any country, and it is autonomous and decentralized. Subsequently, usdk coin also emerged. It is a new type of cryptocurrency and a digital currency based on blockchain technology, which has the characteristics of autonomy and decentralization.

3. Characteristics and principles of usdk currency

usdk currency has the characteristics of autonomy and decentralization. Its issuance is not controlled by any central organization and is not subject to any The country's sedan auction system allows free transactions on the Internet without geographical restrictions. In addition, usdk coins are also secure. All transactions are encrypted, so there is no risk of information leakage.

4. Advantages of usdk currency

usdk currency has the characteristics of autonomy and decentralization. Its issuance is not controlled by any central organization or controlled by any country. Control, free transactions can be conducted on the Internet without geographical restrictions. In addition, it also has the advantage of cost saving because it does not require the support of any central agency, so it can save a lot of costs.

5. Opportunities and challenges that usdk currency brings to users

The emergence of usdk currency provides users with more investment opportunities and challenges. Users can earn profits by investing in usdk coins,However, due to its large price fluctuations, users also need to do risk control to prevent investment losses.

This article studies what usdk coin means, introduces its concept, development history, characteristics and principles, as well as the opportunities and challenges it brings to users. To sum up, usdk currency is a new type of cryptocurrency with the characteristics of autonomy and decentralization. It provides users with more investment opportunities and challenges.

㈤ What does usdk coin mean?

1. USDK is a digital currency based on blockchain and trust license issued by oklink. usdk can be issued or sold with 1 US dollar, and then the assets held by Prime Trust are guaranteed on a 1:1 basis. The birth of usdk is not accidental, it was born in response to the needs of market development. Compared with USDT, it will be more stable.
2. USDK is exchanged with USD at a ratio of 1:1. Coupled with the supervision and management of the US government, stable currencies implement 100% reserves. For example, each USDK is exactly the same as the one in a specific account of Prime Trust. Corresponding to USD 1, every month the audit company will provide audit reports on funds on schedule to ensure the openness and transparency of fund transactions. Once regulatory authorities discover that there are problems with USDK transactions, the regulatory agencies can take law enforcement measures. Means to freeze trading accounts to ensure the safety of funds of other trading users. Therefore, usdk is more stable and secure than usdt. Only with the characteristics of "regulatory, auditable, open and transparent" can the credibility and value stability of this type of digital currency be maximized.
1. It is impossible to buy most cryptocurrencies with US dollars. Bitcoin, Bitcoin Cash, Ethereum, and Litecoin can be purchased with USD using Coinbase. Once you buy Bitcoin with Coinbase, you can transfer your Bitcoin to exchanges like Binance or Changelly to buy other cryptocurrencies, including USDK.
2. usdk coin is a stable currency based on blockchain and trust license launched by a subsidiary of Hong Kong main board listed company Qianjin Holdings Group. It is an ERC-20 digital asset jointly launched by OKLink and PrimeTrust. It is on the Ethereum blockchain It operates on the Internet, is issued and redeemed at US$1, and is guaranteed on a 1:1 basis by assets held by PrimeTrust. It is a real virtual digital currency.
3. Features of USDK currency:
(1) 100% reserve: At any time, the exchange of USDK currency and USD can be guaranteed at 1:1.
(2) Special fund custody: Each USDK coin corresponds to 1 US dollar in the Prime Trust special account.
(3) Regular account audit: The audit company provides regular fund audit reports every month to ensure fund transparency.
(4) Development based on blockchain: USDK coinIt is developed based on blockchain technology such as Ethereum and is visible and credible.
(5) Safe, reliable and trustworthy: The USDK coin smart contract has been audited by Certik and SlowMist, a well-known audit company in the industry.
(6) Strong user base: Relying on a strong user base to bring higher liquidity to stablecoins.

What does usdk coin mean?

USDK is a digital currency based on blockchain and trust license issued by oklink.
According to the standards of the launch platform oklink, usdk coins can be issued and redeemed at 1 US dollar, and are guaranteed on a 1:1 basis with assets held by PrimeTrust. Among them, all the usdk currency buyers and sellers are similar to Taobao, using Alipay. The transaction of usdk currency is called over-the-counter transaction. It is a personal Alipay and WeChat payment. The exchange does not handle any RMB in the process.
The birth of usdk is not accidental. It was born in response to the needs of market development. Compared with usdt, it will be more stable. The usdk currency can be frozen through law enforcement, which greatly improves the stability and transaction security of the digital currency.

㈦ What are the basic knowledge of blockchain

1. FISCO BCOS uses accounts to identify and distinguish each independent user. In a blockchain system that uses a public-private key system, each account corresponds to a pair of public and private keys. Among them, the address string obtained by calculating the public key through a secure one-way algorithm such as hashing is used as the account name of the account, that is, the account address. The private key known only to the user corresponds to the password in the traditional authentication model. Such accounts with private keys are also often called external accounts or accounts.

2. The smart contract deployed on the chain in FISCO BCOS also corresponds to an account in the underlying storage. We call this type of account a contract account. The difference between it and an external account is that the address of the contract account is when it is deployed. Determined, calculated based on the deployer's account address and the information in his account, and the contract account does not have a private key.

3. The SDK needs to hold the external account private key and use the external account private key to sign the transaction. In the blockchain system, every call to the contract writing interface is a transaction, and each transaction needs to be signed with the account's private key.

4. Permission control requires the address of an external account. The FISCO BCOS permission control model determines whether there is permission to write data based on the external account address of the transaction sender.

5. The contract account address uniquely identifies the contract on the blockchain. After each contract is deployed, the underlying node will generate a contract address for it. When calling the contract interface, the contract address needs to be provided.

What does blockchain mean?

Blockchain is a new application model of computer technology such as distributed data storage, point-to-point transmission, consensus mechanism, and encryption algorithm. blockchain,It is an important concept of Bitcoin.

It is essentially a decentralized database. As the underlying technology of Bitcoin, it is a series of data blocks generated using cryptographic methods. Each data block contains a batch of The information of Bitcoin network transactions is used to verify the validity of its information (anti-counterfeiting) and generate the next block.

Blockchain is closely related to people’s production and life in public management, energy, hotel management, transportation and other fields, but the centralized nature of these fields also brings some problems , can be transformed using blockchain.

The decentralized fully distributed DNS service can realize domain name query and resolution through point-to-point data transmission services between each other in the network, and can be used for the operating systems and firmware of some important infrastructures. If it has not been tampered with, the status and initialization of the software can be monitored to detect bad tampering and ensure that the data transmitted by the system using IoT technology has not been tampered with.