BT technology and blockchain

1. blockchain technology uses mathematical methods to achieve distributed accounting and solve the trust problem, so as to complete the decentralization, which will bring far-reaching influence in many fields such as communication, finance, Internet of things, government management and so on
blockchain refers to the technical solution of collective maintenance of a reliable database through centralization and distrust in the past, and it is a technical way for the whole people to participate in bookkeeping. Previous bookkeeping methods were all centralized and needed centralized intermediary, whether it was traditional government, financial institutions, notarization institutions or emerging e-commerce platform and online payment platform
in economic hypothesis, information is sufficient. In fact, it is precisely because of insufficient information that there are very large intermediaries. The existence of intermediaries increases the transaction cost and raises the transaction threshold. In essence, blockchain technology is a large-scale collaboration tool. It makes direct value transfer possible by using pure technology for the first time, and continues the trend of Internet decentralization and disintermediation. Disintermediated blockchain technology will greatly subvert the information intermediary instry
blockchain technology is the basic technology for building bitcoin data structure and encrypted transmission of transaction information, which realizes the issue and transaction of bitcoin. The core of blockchain technology is that all the current participating nodes jointly maintain the transaction and database, so that the transaction is based on the principle of cryptography rather than trust, so that any agreed parties can directly carry out payment transactions without the participation of a third party
technically, a block is a data structure for recording transactions, reflecting the capital flow of a transaction. In the system, the transaction blocks are connected to form a main chain, and all the nodes participating in the calculation record the main chain or part of the main chain
a block contains the following three parts: transaction information, hash formed by the previous block and random number. Transaction information is the task data carried by the block, including the private keys of both parties, the number of transactions, the digital signature of electronic currency, etc; The hash hash formed by the previous block is used to connect the blocks and realize the sequence of past transactions; Random number is the core of the transaction. All nodes compete to calculate the answer of the random number. The node that gets the answer the fastest generates a new block and broadcasts it to all nodes for updating, so as to complete a transaction.

2. You should be normal. The flowers are getting old. They are going to thank you. The flowering period lasted about one and a half months
the leaves are normal
Osmanthus fragrans are cymes clustered in leaf axils, or close to broom shaped, with many flowers in each axil; Bracts broadly ovate, thick, 2-4 mm long, mucronate, glabrous; Pedicel slender, 4-10 mm long, glabrous; The flowers are very fragrant; Calyx ca. 1 mm, lobes slightly irregular; Corolla yellow white, light yellow, yellow or orange red, 3-4 mm long, corolla tube only 0.5-1 mm long; Stamens inserted in the middle of corolla tube, filaments very short, about 0.5 mm long, anthers about 1 mm long, connectives slightly extended at the apex of anthers, showing inconspicuous small tip; Pistil ca. 1.5 mm, style ca. 0.5 mm. Fruit skew, oval, 1-1.5 cm long, purple black. The flowering period is from September to early October, and the fruiting period is in March of the next year.

3. This is the syllabus of Python full stack development + artificial intelligence:
stage 1: Python development foundation
Python development foundation of Python full stack development and artificial intelligence. The learning contents include: Python basic syntax, data type, character encoding, file operation, function, decorator, iterator, built-in method, common moles, etc
stage 2: Python advanced programming and database development
Python full stack development and artificial intelligence: Python advanced programming and database development knowledge learning content includes: object-oriented development, socket network programming, thread, process, queue, IO multi-channel model, MySQL database development, etc
stage 3: front end development
the front-end development knowledge of Python full stack development and artificial intelligence includes: HTML, CSS, JavaScript development, jQuery & bootstrap development, front-end framework Vue development, etc
stage 4: Web Framework Development
learning content of Python full stack development and artificial intelligence web framework development includes: Django framework foundation, Django framework advanced, BBS + blog actual combat project development, cache and queue middleware, flash framework learning, tornado framework learning, restful API, etc
stage 5: crawler development
Python full stack development and AI crawler development learning content includes: crawler development practice
stage 6: full stack project practice
the whole stack project practice learning content of Python full stack development and artificial intelligence includes: enterprise application tool learning, CRM customer relationship management system development, Lufei online ecation platform development, etc
stage 7: data analysis
data analysis of Python full stack development and artificial intelligence learning content includes: financial quantitative analysis
stage 8: artificial intelligence
Python full stack development and artificial intelligence. The contents of artificial intelligence learning include: machine learning, data analysis, image recognition, natural language translation, etc
stage 9: automatic operation and maintenance & Development
Python full stack development and automatic operation and maintenance & development of artificial intelligence. The learning contents include: CMDB asset management system development, it audit + host management system development, distributed host monitoring system development, etc
stage 10: high concurrency language go development
Python full stack development and high concurrency language go development of artificial intelligence learning content includes: go language foundation, data type and file IO operation, function and object-oriented, concurrent programming, etc.

4. Press the "s" key on the keyboard and the "↓" of the cursor movement key, press the "s" key with the left hand and "↓" with the right hand, and it will be easier to score with both hands.

5. Blockchain technology, also known as distributed ledger technology, is an Internet database technology, which is characterized by decentralization, openness and transparency, so that everyone can participate in database records
you can go to oyuan.com to find out

6. Do you mean your own app or the business app? Now the e-commerce version of the app can recharge itself, which depends on whether the developer of your app has opened this function.