BTC technology explanation

1.

Dahua blockchain is a book published by Tsinghua University Press in September 2019, written by Zhang Yingping. This book is a blockchain book that comprehensively explains bitcoin, Ethereum, super ledger and EOS, a blockchain development guide from engineer basic skills, development language to smart contract development, and a blockchain engineer guide from technology, project to career development planning

"Dahua blockchain"

"Dahua blockchain" is a blockchain book that pays equal attention to theory and practice, easy to understand and professional. The blockchain technology guide (the first three chapters) mainly explains the concept of blockchain, blockchain applications, bitcoin, Ethereum, super ledger, EOS and other mainstream blockchain technologies. Through learning, each reader can fully understand the implementation principles of mainstream blockchain technologies and understand the future development trend of blockchain. The practical part of development (the last two chapters) starts from the basic skills of blockchain, simulates the development of real blockchain projects, and explains in detail the design, development and deployment of smart contract and DAPP. Through learning, every reader can master the development of blockchain

2. Let's take bitcoin as an example:
blockchain is an important concept of bitcoin, which is essentially a decentralized database and serves as the underlying technology of bitcoin. Blockchain is a series of data blocks generated by cryptography. Each data block contains the information of a bitcoin network transaction, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block
blockchain is public on the network and can be queried in every offline bitcoin wallet data. The function of bitcoin wallet depends on the confirmation with the blockchain. An effective inspection is called a confirmation. Usually, a transaction needs to obtain several confirmations. The lightweight bitcoin wallet uses online confirmation, that is, it will not download the blockchain data to the device storage
many of bitcoin's competitors also use the same design, but the workload proof and algorithm are slightly different. For example, the use of proof of interest and scrypt and so on
in addition, digital cryptocurrencies such as Laite coin, Ethereum, Weimeng coin, doggy coin and Ruitai coin also use blockchain technology.

3. Blockchain. The following is a detailed introction of bitcoin from AEX exchange coin network:
the concept of bitcoin was first proposed by Nakamoto in 2009. According to Nakamoto's idea, the open source software was designed and released, and the P2P network on it was built. Bitcoin is a kind of P2P digital currency. Point to point transmission means a decentralized payment system. Unlike most currencies, bitcoin does not rely on specific currency institutions. It is generated by a large number of calculations based on specific algorithms. Bitcoin economy uses the distributed database composed of many nodes in the whole P2P network to confirm and record all transactions, and uses the design of cryptography to ensure the security of all aspects of currency circulation. The decentralized nature of P2P and the algorithm itself can ensure that it is impossible to artificially manipulate the value of bitcoin by mass manufacturing. The design based on cryptography can make bitcoin only be transferred or paid by the real owner. This also ensures the anonymity of money ownership and circulation transactions. The biggest difference between bitcoin and other virtual currencies is that the total amount of bitcoin is very limited and it has a strong scarcity. The monetary system used to have no more than 10.5 million in four years, after which the total number will be permanently limited to 21 million. Bitcoin can be cashed and converted into the currency of most countries. Users can use bitcoin to buy some virtual goods, such as clothes, hats and equipment in online games. As long as someone accepts it, they can also use bitcoin to buy real-life goods.

4.

The difference between foreign currency and foreign exchange mainly lies in the following two aspects:

1. Different concepts

foreign exchange refers to the creditor's rights that a country can use in the event of balance of payments deficit in the form of bank deposits, treasury bonds of the Ministry of finance, long-term and short-term government securities, etc. To put it simply, it means all the foreign currency assets owned by a country and various payment means that can be used for international settlement of claims and debts

Foreign currency refers to all foreign currencies except domestic currency

The main uses of foreign exchange are: means of payment and credit instruments for international trade and settlement; It can be used to adjust the balance of international funds; It can be used as an important international reserve resource of a country

Foreign currency is mainly used for commodity payment and currency exchange

extended information:

foreign exchange trading should pay attention to:

1, looking for events to stimulate market volatility

if you want to trade, then you should look for events to quickly stimulate market volatility, which can be company statements, data release or important meetings. These events can affect the fluctuation direction of the market in a very short period of time, so they also give traders the opportunity to make quick profits

In foreign exchange trading, if the market is contrary to your expectation, it is normal for you to feel panic. You must set a stop loss to control the loss range, rather than hope that the market will eventually change direction. Most successful traders are very sensitive to the loss, they will try their best to control the loss. In addition, don't move the stop at will

3. Keep checking the market

if you are sure that you have enough time to check the market frequently, you can start trading. When some short-term traders find that the market is contrary to expectations, they will decide to take long-term positions halfway. But it's likely to get stuck in a deal that's not good for you

5. Responsibly speaking, the private key is everything. If you keep it yourself, there will be a lot of security risks, such as forgetting, losing and accidentally damaging the device. At this time, you can use a reliable third-party wallet, such as a coin pack. The user password of the coin pack is encrypted with salted sha-512-pbkdf2 high-strength encryption technology and stored on the server. The strength of this encryption algorithm is higher than that of the public key and private key algorithm of the special currency, and the employees of the currency package cannot obtain it. Even if the database is stolen, the user password cannot be cracked.

6. Method / step
1 close the bitcoin client and find the file wallet.dat
WinXP start menu, select "run" and input the following contents: Explorer% appdata% bitcoin
Windows Vista or windows 7, directly input wallet.dat in the "search programs and files" box of the start menu to search
2 right click on the file and select "add to compressed file...", then the following dialog box will appear:
3 set a file name, Check "delete source file after compression"
then click the "advanced" tab:
4 click "set password..." and enter the same password twice in the pop-up dialog box
click "OK" and then click "OK" again to complete the encryption
5 you will see that the original wallet.dat file in the wallet folder is gone, but there is an additional. Rar file
6 encryption is successful
restore wallet
1 you just need to follow the steps of "back up wallet" (described in the previous experience) to open the wallet folder of bitcoin official client
2 the backup wallet.dat file to this folder, and then overlay the original file
precautions
if you use winrar to encrypt the backup, you need to enter the correct password first to restore the wallet.dat.

7. Hello, friend! Bitcoin is simply a kind of virtual currency, which can be used to exchange the currency of most countries. Bitcoin can be used to buy virtual goods on the Internet, such as clothes, hats and equipment in online games. As long as people accept it, they can also buy real-life goods