Go deep into Ethereum smart contract to develop Yangzhen

2.

The smart contract has been written for a long time

if they can add changes, the description is centralized

the contract is written into the Ethereum smart contract, which is a contradiction sentence

the financial customer service doesn't understand, which is very unreliable

community sites

3. Go full stack + blockchain course:
a total of 22 weeks, divided into five stages,
the first stage is 4 weeks, go language foundation and network concurrency, learning the introctory go language,
the second stage is 4 weeks, go language practical web development, crawler development, cryptography, consensus algorithm, realizing lightweight public chain, learning the website and crawler that can develop golang, Achieve lightweight blockchain
stage 3, 4-week Ethereum source code analysis and smart contract DAPP development, master Ethereum core and smart contract development, as well as blockchain,
stage 4, 4-week super ledger, bitcoin EOS, source code analysis and smart contract practice, master super ledger development, cat bitcoin, bifurcated EOS after learning, As well as DAPP development of smart contract
phase 5, 6-week project practice, five enterprise level projects, and one year of blockchain project experience after learning
from the characteristics of the language itself, go is a very efficient language, which highly supports concurrency. Go language itself pays more attention to distributed system, and concurrency processing is relatively good, such as advertising and search, That kind of high concurrency server
go language advantages:
excellent performance, can be directly compiled into machine code, does not rely on other libraries, go is extremely fast. Its performance is similar to Java or C + +
concurrency is supported at the language level, which is the biggest feature of go. It is born to support concurrency, and go is the concurrency supported in gene, which can make full use of multi-core and make it easy to use concurrency
the built-in runtime supports garbage collection, which is one of the features of dynamic language. Although GC is not perfect at present, it is enough to cope with most of the situations we can encounter, especially GC after go1.1
it's easy to learn. The authors of go language all have the gene of C, so go naturally has the gene of C. There are 25 go keywords, but the expressive ability is very strong. It almost supports most of the features you've seen in other languages: inheritance, overloading, object, etc
rich standard libraries, go has built a large number of libraries, especially the network library, which is also my favorite part< As like as two peas, br / > built-in powerful tools, Go language is built with many tools chain, the best should be gofmt tools, automatic formatting code, make team review become so simple, code format is exactly the same, it is very difficult to think differently.
cross platform compilation and fast compilation. Compared with the sluggish compilation speed of Java and C + +, the fast compilation time of go is a major efficiency advantage
disadvantages of go language:
package management: package management of go language is absolutely not perfect. By default, it has no way to make a specific version of the dependency library, nor can it create replicable builds. In contrast, python, node and Ruby all have better package management systems. However, with the right tools, the package management of go language can also perform well
lack of development framework: go language does not have a major framework, such as Ruby's rails framework, Python's Django framework or PHP's laravel. This is a heated discussion in the go language community, because many people think that we should not start with using frameworks. This is true in many cases, but if you just want to build a simple crud API, it's much easier to use Django / djrf, rails laravel, or Phoenix
exception handling: go language can help developers deal with compilation errors by simply returning errors (or call stack) through functions and expected calling codes. Although this method is effective, it is easy to lose the scope of the error, so it is difficult to provide meaningful error information to users. Error package can solve this problem by allowing us to add context and stack trace to return error
another problem is that we may forget to handle errors. Static analysis tools such as errcheck and megacheck can avoid these errors. Although these solutions are very effective, they may not be the right way.

4. Because blockchain technology has natural advantages in realizing smart contracts. Bitcoin, Ruitai, Laite, Ethereum and other digital cryptocurrencies all use blockchain technology. Blockchain is an important concept of bitcoin. In essence, it is a decentralized database and the underlying technology of bitcoin. Blockchain is a chain of uses

5. Ethereum is a distributed computing platform. It generates an cryptocurrency called ether. Programmers can write "smart contracts" on the Ethereum blockchain, and these Ethereum smart contracts will be executed automatically according to the code

what is Ethereum
Ethereum is often compared with bitcoin, but the situation is different. Bitcoin is a kind of cryptocurrency and distributed payment network, which allows bitcoin to be transferred between users

related: what is bitcoin? How does it work

Ethereum has a bigger goal. As Ethereum says, "Ethereum is a distributed platform running smart contracts.". These smart contracts run on "Ethereum virtual machine", a distributed computing network composed of all devices running Ethernet nodes

"distributed platform" means that anyone can set up and run an Ethereum node just as anyone can run a bitcoin node. Anyone who wants to run "smart contracts" on nodes must pay the operators of these nodes in ether, which is a cryptocurrency related to Ethereum. Therefore, the person running the Ethernet node provides computing power and gets paid in the Ethernet, which is similar to the way that the person running the bitcoin node provides hash power and pays in bitcoin

in other words, although bitcoin is only a blockchain and payment network, Ethereum is a distributed computing network, and its blockchain can be used for many other things. Details are provided in the Ethereum white paper

what is ether
Ethernet is a digital token (or cryptocurrency) related to Ethereum blockchain. In other words, Ethereum is the token and Ethereum is the platform. But now people often use these terms alternately. For example, coinbase allows you to buy Ethereum, which stands for Ethereum

this is technically "altcoin", which actually means a non bitcoin cryptocurrency. Like bitcoin, ether is supported by distributed blockchain - in this case, Ethereum blockchain

developers who want to create applications or Ethereum smart contracts on Ethereum blockchain need Ethernet token to pay for nodes to host it, while users of Ethereum based applications may need Ethernet to pay for services in these applications. People can also sell services outside the Ethereum network and accept Ethernet payments, or they can sell Ethernet tokens in cash - just like bitcoin

6. Tomb Raider 9 1080 resolution has the highest image quality, and the special effects are fully open at about 40 frames
Tomb Raider 10 1080 resolution has the special effects at about 35 frames
that's the level.

7. Not necessarily, but Ethereum has no upper limit, which is really good

8. I don't know where the landlord said that he was attacked by hackers, but it's not impossible. Although blockchain is very popular at present, there is no absolute security for anything, even bitcoin

9.

Trc20 is a stable currency channel jointly issued by rc20usdt and Teda Company. Compared with old stable currencies such as omni usdt and erc20-usdt, trc20-usdt has been greatly optimized in terms of transfer fee and transaction confirmation speed

in terms of cost, trc20-usdt can realize free transfer. According to the withdrawal fees of mainstream exchanges, usdt based on Omni protocol has the highest withdrawal fee, ranging from US $4 to US $10, erc-20 from US $1 to US $5, and trc20-usdt has zero withdrawal fee, which means that users can enjoy the withdrawal service of exchange free of fees

in terms of transaction confirmation speed, usdt issued based on wave field network gives full play to the performance advantages of the third generation public chain, and the TPS of wave field network can reach thousands of levels, which can realize transaction second level confirmation, which is significantly better than Omni and erc20. The extremely fast transfer speed can meet the various needs of stable currency users, and avoid the damage to the interests of investors caused by network congestion

The characteristics of

trc20 are as follows:

trc-20 protocol is transformed from erc-20, but it has stronger community support. It can not only run smart contracts supporting wavefield Tron, but also support Ethereum smart contracts. Developers can easily migrate Ethereum smart contracts to wavefield Tron main network, with higher flexibility, It gives developers more freedom

In particular, trc-20 protocol can form a complementary to trc-10 protocol, which can achieve additional logic that trc-10 protocol can not achieve, which makes the network protocol of wavefield Tron get greater energy release. Tronlink bobao wallet has supported all the currencies of TRX, trc-10 and trc-20 of wave field Tron ecology, meeting the various needs of global wave field Tron community users

the chain transfer of trc20-usdt is also free. According to the data, Omni is the earliest distribution network adopted by usdt, and its cost is the most expensive, followed by Ethereum's, and the gas fee of US $0.06-0.7 is required for each transfer. Expensive fees are no longer applicable to the growing demand for transfer. This is one of the important reasons for the popularity of trc20-usdt