区块链开放源码是什么,区块链开放源码有什么用

区块链开放源码是指由开发者开发的区块链软件，它可以被任何人免费访问和使用。它包括所有的源代码，以及用于编译和安装软件的所有文件。区块链开放源码是一种开放源码许可证，它允许任何人在遵守许可证的情况下自由使用、复制和修改源代码。

首先，我们来讨论去中心化。去中心化是区块链技术的核心理念，它涉及将控制权从中心化的机构转移到网络中的参与者。通过使用去中心化的技术，可以实现更高的安全性、可靠性和可信性。去中心化有助于改善系统的可扩展性，减少费用，消除信任问题，提高数据的完整性和安全性。

其次，我们来讨论开放源码。开放源码是一种软件许可证，允许任何人在遵守许可证的前提下自由使用、复制和修改源代码。使用开放源码可以确保软件的可靠性和可信度，因为任何人都可以检查源代码，并确保其正确性。另外，开放源码还可以帮助开发者更快地实现新功能，因为他们可以借鉴他人的代码，并在此基础上进行改进。

最后，我们来讨论安全性。区块链开放源码的安全性是极其重要的，因为它们可以用来存储和处理敏感的数据。因此，开发者必须确保软件的安全性，以确保网络中的数据不会被篡改或泄露。为此，开发者需要利用加密算法、分布式架构和其他安全技术来保护网络中的数据。此外，开发者还需要定期对软件进行安全审计，以确保其安全性。

总之，区块链开放源码是一种开放源码许可证，它允许任何人在遵守许可证的情况下自由使用、复制和修改源代码。它的最大优势在于可以提高系统的可扩展性、安全性和可信性，从而有助于改善网络中的数据完整性和安全性。

A. What exactly is Bitcoin?

Bitcoin is a currency based on decentralization, using peer-to-peer network and consensus initiative, open source code, to differentiate Blockchain, as a virtual cryptocurrency with underlying technology, was proposed by Satoshi Nakamoto in 2008 and was born in 2009. Bitcoin does not have a centralized issuer, it is generated by the calculation of network nodes, can be bought and sold on any computer connected to the Internet, and has extremely strong scarcity.

Starting from the essence of Bitcoin, the essence of Bitcoin is actually a bunch of special solutions generated by complex algorithms. A special solution refers to a set of limited solutions that can be obtained by a system of equations. And every special solution can solve the equation and is unique. Using the analogy of banknotes, Bitcoin is the serial number of the banknote. Once you know the serial number on a certain banknote, you own the banknote. The mining process is to continuously seek special solutions to this system of equations through a huge amount of calculations. This system of equations is designed to have only 21 million special solutions, so the upper limit of Bitcoin is 21 million.

To mine Bitcoin, you can download a dedicated Bitcoin calculation tool, then register on various cooperative websites, fill in the registered username and password into the calculation program, and then click the calculation to officially start. After completing the Bitcoin client installation, you can directly obtain a Bitcoin address. When others pay, you only need to post the address to others, and you can pay through the same client. After installing the Bitcoin client, it will be assigned a private key and a public key. You need to back up your wallet data containing your private key to ensure that your property is not lost. If unfortunately the hard drive is completely formatted, one's Bitcoins will be completely lost.

Currency Characteristics
Decentralization: Bitcoin is the first distributed virtual currency. The entire network is composed of users and there is no central bank. Decentralization is the guarantee of Bitcoin’s security and freedom.

Worldwide circulation: Bitcoin can be managed on any computer connected to the Internet. Anyone can mine, buy, sell or receive Bitcoin regardless of location.

Exclusive ownership: Manipulating Bitcoin requires a private key, which can be isolated and stored on any storage medium. No one can obtain it except the user himself.

Low transaction fees: It is free to remit Bitcoin, but there will ultimately be a transaction fee of approximately 1 bit cent per transaction to ensure faster transaction execution.

No hidden costs: As a means of payment from A to B, Bitcoin has no cumbersome limits and procedures. You can make the payment by knowing the other party's Bitcoin address.

Cross-platform mining: Users can explore the computing capabilities of different hardware on many platforms.

Advantages
Completely decentralized, without an issuing agency, it is impossible to control issuancequantity. Its issuance and circulation are realized through the open source p2p algorithm.

Anonymous, tax-free and regulatory-free.

Robustness. Bitcoin completely relies on the p2p network and has no issuance center, so the outside world cannot shut it down. The price of Bitcoin may fluctuate and collapse, and many governments may declare it illegal, but Bitcoin and Bitcoin’s huge p2p network will not disappear.

No borders, cross borders. Cross-border remittances will pass through layers of foreign exchange control agencies, and transaction records will be recorded by multiple parties. But if you use Bitcoin to trade, you can directly enter the digital address, click the mouse, and wait for the p2p network to confirm the transaction, and a large amount of money will be gone. It does not go through any control agency and will not leave any cross-border transaction records.

It is difficult for copycats to survive. Since the Bitcoin algorithm is completely open source, anyone can download the source code, modify some parameters, and recompile it to create a new p2p currency. However, these counterfeit currencies are fragile and extremely susceptible to 51% attacks. Any individual or organization, as long as it controls 51% of the computing power of a p2p currency network, can manipulate transactions and currency values ​​at will, which will cause a devastating blow to the p2p currency. Many altcoins fail at this point. The Bitcoin network is already robust enough. If you want to control 51% of the computing power of the Bitcoin network, the number of CPU/GPU required will be an astronomical number.

Disadvantages
Fragility of the trading platform. The Bitcoin network is robust, but Bitcoin trading platforms are fragile. The trading platform is usually a website, and the website can be hacked or shut down by the authorities.

Transaction confirmation takes a long time. When a Bitcoin wallet is first installed, it will take a lot of time to download historical transaction data blocks. When doing Bitcoin transactions, in order to confirm the accuracy of the data, it will take some time to interact with the p2p network. The transaction will not be completed until the entire network confirms it.

Price fluctuates greatly. Due to the involvement of a large number of speculators, the price of converting Bitcoin to cash has fluctuated like a roller coaster. Making Bitcoin more suitable for speculation rather than anonymous transactions.

The public does not understand the principles, and there is resistance from traditional financial practitioners. Active netizens understand the principles of p2p networks and know that Bitcoin cannot be manipulated and controlled by humans. 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 eyes of traditional financial practitioners, currency “without an issuer” is worthless.

B. Does the code of blockchain projects need to be sourced? Why

Blockchain is a consensus mechanism, which means that such participants must be transparent, that is to say , this kind of running code must be open source code. The so-called open source code means that the code is all visible.

Everyone can compile and execute their own compiled programs,It also means that everyone can modify the code and run it. Under the current mechanism, you can modify the code no matter how you modify it, as long as the number of people who modify the code does not exceed 51%, then this kind of modification is meaningless and is a waste of your own time. computing power.

So, at least the people involved must know the code. If the code of a blockchain project is not open source, then the nodes running its program will be opaque, which is equivalent to you putting His agent is installed on his own node and will execute orders on behalf of this owner. It is equivalent to system developers controlling the entire network. How is this kind of blockchain possible?

From a conceptual perspective, if the blockchain project is compared to a machine, its working mechanism is transparent and it is a trustworthy machine. This is how we understand this. First, open source is a must for blockchain projects, not an option. Both public chains and alliance projects need to be open source. Second, open source and delivering source code are two different things. Different concepts, delivering source code is not an open, transparent, and joint process for everyone to participate.

For example, in Ethereum, a certain platform currency running on its platform once had a vulnerability and needed to be modified. This modification was directly reflected in the code. In the process of reading the code , I found that the relevant code of the currency appears in many places, which is used to deal with how the node should deal with this problem once it encounters this problem. These processing methods are all written in open source code and everyone can read it. If the person in charge of the node If he approves this solution, he will run this program, which is equivalent to supporting the decision of this code. In fact, the blockchain is implemented through this mechanism.

C. What do the three currencies BTC, ETH, and USDT on Bit Blue Whale mean?

BTC is Bitcoin, ETH is Ethereum currency, and USDT is owned by the American Tether company. A token issued to be equivalent to the US dollar

D. The difference between open source and non-open source digital currency

The difference between open source and non-open source digital currency:

1. Open source means that the internal code of the system is completely open, and users can change or add corresponding functions according to their needs; non-open source means that the copyright belongs to the developer, and users do not know the source code content and cannot modify the source code.

2. Those who are open source belong to the active side, and those who do not have open source belong to the passive side.

Open source means open source code, which can be used for learning or commercial use (commercial use may require additional payment). Not open source means that the source code is not open, and others cannot obtain the source code through legal channels. The difference between the two is quite big.

Digital currencies are generally divided into the following concepts.

“Mainstream coins”, “MLM coins”, “air coins”, and “altcoins” .

1. Mainstream coins. It can be understood as the top ten digital currencies on major ranking exchanges., which is also the digital currency with the largest circulation. This type of digital currency is often precipitated over a certain period of time, just like the ancient sects in novels.

2. The best way to identify "MLM Coin" is that it has nothing to do with the blockchain and is just a "concept". Use high returns as a facade and shout all the way: Any fool can make money as long as you throw money in. If you encounter a situation that you have never heard of, but it claims a high return rate of one thousand or two thousand times as soon as it comes out, then please avoid it without any consideration.

3. The difference of "Air Coin" is that it does not have any application scenarios, or some application scenarios that are boasted by senior experts. However, when I think about these application scenarios, it is impossible to realize them. In terms of publicity, there are many unknown big names on the platform.

The team members have a lot of titles and application scenarios that describe the currency in a cloud. A digital currency whose purpose is only to issue coins and make money has no actual application scenarios, nor does it have its own main chain. There is no effective open source code, and it is very likely that it is an "air currency" - nothing.

4. "Altcoin" Strictly speaking, any currency other than Bitcoin is an altcoin. Because copycat means high imitation, imitation, meaning.

E. How to use blockchain to establish a commodity trading co-governance platform

As blockchain will bring about earth-shaking changes in the coming years, those who have the upper hand will have unique opportunities. The days of the Frankenstein-like financial system are naturally numbered. Now the world's financial services industry is full of all kinds of problems. It is built on technology platforms decades ago and looks outdated. Compared with the growth of cash, the rapid digital world seems to be very fast, showing its slow and unreliable side from time to time. It has left billions of people without access to even the most basic financial tools outside the system. In addition, the highly centralized nature also faces the risk of data leakage, hacking, and total downtime, not to mention that its exclusive position naturally tends to maintain the status quo and inhibit innovation. Blockchain is not only a powerful tool to solve these problems, but also brings a lot of innovation, allowing entrepreneurs to find more new tools to create business value on this platform.

Six reasons why blockchain can have a profound impact on the financial services industry, break the existing exclusive structure, allow individuals and corporate organizations to have real opportunities to choose, and create a managed business value.

1. Efficiency of proof. For the first time in history, humans can complete commercial transactions without knowing each other and without a basis for mutual trust.

2. Cost. The network architecture of the blockchain completes the clearing and settlement work through point-to-point digital transfer, and these actions are continuously performed so that the ledger information is always maintained in the latest state.

3. Efficiency. Now it takes us three to seven days to complete the remittance and two to three days to complete the stock delivery. When applying for a bank loan, it usually takes a stifling 23 days to get it approved.

4. Risk management. Blockchain could slow down many financial risk settlementsRisk is just one of them. The other is counterparty risk, and the most important is systemic risk.

5. Value innovation. The purpose of establishing the Bitcoin blockchain is simple. It does not include other assets except Bitcoin. However, since the blockchain adopts the original code method, it also provides room for modification. Some people who pursue innovation are developing other projects. Alternative coins and blockchain scum must first compete with Bitcoin.

6. Open source. The financial services industry is a system that has been formed by stacking layers of early technologies on top of each other. Now it is crumbling. It is very difficult to promote change in this field now, because every time we improve this kind of engineering, we must go back. Blockchain is an open source technology. You can continue to pursue innovation and keep testing back and forth until you can do it. Achieve satisfactory results on the consensus of network architecture.

The above six advantages. It can change not only payment methods, but also securities, industrial investment, bank accounting and verification work. Venture capital, insurance companies, risk management, retail banking and other pillars that support the industry are also likely to keep up with the pace of change.

F. Comprehensive interpretation of blockchain and Bitcoin, teach you to understand the relationship between the two

01 Blockchain is the underlying technology of Bitcoin

Blockchain is a distributed account, in short, a decentralized ledger that can be viewed and joined by many people. For example, each block is equivalent to each knot on the rope. When each new transaction enters the blockchain, it is equivalent to an event. To mark the occurrence of an event, a symbolic knot is made and the details are recorded on the specific knot

Bitcoin uses blockchain for value storage and transactions. In addition, the technical difficulty of the blockchain itself is not the greatest, but its application scenarios and regulatory issues include three types of blockchain: public blockchain, private blockchain and joint blockchain; the other classification is permissionless and permissions

Therefore, cryptocurrency uses blockchain technology, but blockchain technology does not entirely belong to cryptocurrency

02 When the financial crisis comes, blockchain technology It can prevent counterfeiting, trace the source, and simplify transactions in the financial industry. Some investors choose to invest in cryptocurrency to avoid corresponding asset risks and benefit from the mechanism of blockchain to solve trust problems. This technology has been applied to financial management and transactions. The main performance is that blockchain can track various types of transactions and can also play an anti-counterfeiting and traceability role in various scenarios. Copyright, trademark, academic fraud and other issues have been exposed one after another

In addition, blockchain technology can also simplify transactions, make the entire transaction process open and transparent, track the links of each transaction event, and ensure that both parties have certain rights. Degree of trust

03 The concept of Bitcoin is different from that of blockchain

During the "mining" process, the open source blockchain network can ensure trust and cannot be tampered with. When a networked computer passesWhen an accurate algorithm gives the correct answer, the "absentee" will be rewarded for mining and can use servers around the world, but the whole process is still very energy-consuming

Currency Chart B Coin : A comprehensive explanation of blockchain and Bitcoin will teach you to understand the relationship between them. Bitcoin is an open source version of blockchain technology, that is, a network developed for everyone, and it is popular for its decentralized advantages. However, as a public blockchain, Bitcoin consumes a lot of computing power due to mining, which leads to severe power consumption in many countries

Therefore, for an emerging technology, it is best not to be blind Trust or invest and recognize its true purpose in order to see everything objectively and be prepared.

#BTC[超话]# #digital currency# #欧易OKEx#

G. How was the world-famous “Bitcoin” created?

Bitcoin is a virtual digital currency. This is generated by open source (computing methods are disclosed) P2P software through a large number of calculations, using distributed databases across the entire network for transaction confirmation. It has the characteristics of fast transactions, non-forgery, etc., and has obvious "decentralization" characteristics.

One computer involved in the issuance of Bitcoin is called a "mining node", while the other computer is called mining. Among them, its core "blockchain" technology is adopted. Each miner node participating in mining collects transactions that occurred on the network but have not been confirmed and incorporates them into the new block lock. This block will be connected with all the previous blocks to form a chain. Each node adds a new random adjustment number and then calculates the SHA-256 hash of the previous blockchain. If it falls below the specific target set, it is considered a success. If the target is not reached, the node will change the randomly adjusted amount and try again and again.

As for buying Bitcoin, you just need to know that everyone will use computing resources to calculate without relying on currency issuing institutions such as central banks.

What do you think?

H. How to ensure safe use of blockchain

One of the characteristics of blockchain projects (especially public chains) is open source. Open source code improves the credibility of the project and allows more people to participate. But the openness of source code also makes it easier for attackers to attack the blockchain system. There have been many hacker attacks in the past two years. Recently, the anonymous currency Verge (XVG) has been attacked again. The attacker has locked a vulnerability in the XVG code, which allows malicious miners to add false times to blocks. After stamping, new blocks were quickly mined, and nearly US$1.75 million worth of digital currency was obtained in just a few hours. Although the attack was successfully stopped later, no one can guarantee whether future attackers willStrike again.

Of course, blockchain developers can also take some measures

The first is to use professional code audit services,

The second is to understand safe coding standards, Nip problems in the bud.

Security of cryptographic algorithms

The development of quantum computers will bring major security threats to the cryptographic systems currently in use. Blockchain mainly relies on the elliptic curve public key encryption algorithm to generate digital signatures for secure transactions. Currently, the most commonly used ECDSA, RSA, DSA, etc. cannot withstand quantum attacks in theory, and there will be greater risks. More and more Researchers are beginning to focus on cryptographic algorithms that are resistant to quantum attacks.

Of course, in addition to changing the algorithm, there is another way to improve security:

Refer to Bitcoin’s handling of public key addresses to reduce the risk of public key leaks. Potential risks. As a user, especially a Bitcoin user, the balance after each transaction is stored in a new address to ensure that the public key of the address where Bitcoin funds are stored is not leaked.

Security of the consensus mechanism

The current consensus mechanisms include Proof of Work (PoW), Proof of Stake (PoS), and Delegated Proof of Stake (PoS). Proof of Stake (DPoS), Practical Byzantine Fault Tolerance (PBFT), etc.

PoW faces 51% attack problem. Since PoW relies on computing power, when an attacker has a computing power advantage, the probability of finding a new block will be greater than that of other nodes. At this time, it has the ability to undo transactions that have already occurred. It should be noted that even in this case, the attacker can only modify his own transactions and not the transactions of other users (the attacker does not have the private keys of other users).

In PoS, an attacker can only successfully attack when he holds more than 51% of the token amount, which is more difficult than 51% of the computing power in PoW.

In PBFT, the system is safe when the number of malicious nodes is less than 1/3 of the total nodes. In general, any consensus mechanism has its conditions for establishment. As an attacker, you also need to consider that once the attack is successful, the value of the system will be reduced to zero. At this time, the attacker has nothing to do except destroy it. Get other valuable rewards.

For designers of blockchain projects, they should understand the advantages and disadvantages of each consensus mechanism, so as to choose an appropriate consensus mechanism or design a new consensus mechanism according to the needs of the scenario.

Security of smart contracts

Smart contracts have the advantages of low running costs and low risks of human intervention. However, if there are problems with the design of smart contracts, it may cause greater consequences. loss. June 2016, EthereumThe DAO, the most crowdfunded project on the blockchain, was attacked, and hackers obtained more than 3.5 million Ethereum coins, which later led to the fork of Ethereum into ETH and ETC.

The measures proposed in this regard have two aspects:

The first is to conduct a security audit of smart contracts,

The second is to follow the principles of safe development of smart contracts.

The security development principles of smart contracts include: be prepared for possible errors and ensure that the code can correctly handle bugs and vulnerabilities; release smart contracts with caution, do functional testing and security testing, and fully consider boundaries; keep smart contracts concise; pay attention to blockchain threat intelligence and check for updates in a timely manner; be clear about the characteristics of the blockchain, such as calling external contracts with caution, etc.

Security of digital wallets

Digital wallets mainly have three security risks: First, design flaws. At the end of 2014, a serious random number problem (duplication of R values) caused users to lose hundreds of digital assets in a certain lottery. Second, digital wallets contain malicious code. Third, lost assets caused by loss or damage of computers and mobile phones.

There are four main countermeasures:

The first is to ensure the randomness of the private key;

The second is to verify the hash value before installing the software , ensure that the digital wallet software has not been tampered with;

The third is to use a cold wallet;

The fourth is to back up the private key.

I. What are the blockchain open source technologies?

I will only talk about the ones I know better. One is an open source project based on the Bitcoin system called Cravecoin, and the other is Ethereum. Square. We initially chose cravecoin for source code analysis and wanted to carry out secondary development on it, but because Ethereum is more open and supports smart contracts well, we gave up after analyzing it for a while.
Then we entered the research of Ethereum. At first, we wanted to start from the underlying source code, but the whole process was quite difficult. After re-analyzing our needs, we felt that we could also carry out certain development using its existing interfaces to meet some needs. , so after translating all the source code comments and basically understanding the role of each module, no further modifications will be made. After all, Ethereum is also a project that dozens of experts took a long time to build, < br />It is difficult for us to successfully transform it into what we want within a period of time. To achieve the goal, the faster and easier the better.
And there is a very important issue. If Ethereum is changed, it will no longer be able to connect to its public network, and it will not be able to use its world's second largest computing power. This is a matter of putting the cart before the horse. It seems that the answer is wrong, but the main point I want to express is that if the questioner wants to develop, it is enough to carefully analyze a project.
After all, the logic is similar. To learn more blockchain knowledge, follow "District View Network"