Ethereum test method

1.

If you want to query the transaction records on the main network, you can use Etherscan. However, if you build your own private chain, how should you query the transaction records

the answer is that you need to listen to the logs on the chain, save them in the database, and then query them in the database. For example:

< pre t = "code" L = "Java" > varaddr = & quot& quot;< br />varfilter=web3.eth.filter({fromB lock:0 ,toBlock:' latest', address:addr });< br />filter.get(function(err,transactions){
transactions.forEach(function(tx){
vartxInfo=web3.eth.getTransaction(tx.transactionHash);
/ / at this time, the transaction information txinfo can be stored in the database
})< br />});

Web3. Eth. Filter() is used to monitor the log on the chain, and Web3. Eth. Gettransaction() is used to extract the information of the specified transaction. Once the transaction information is obtained, it can be stored in the database for query

recommend a practical introction, you can see: Ethereum tutorial

2.

In fact, Ethernet is an electronic virtual currency, which is regarded as "bitcoin version 2.0". The blockchain technology "Ethereum", which is different from bitcoin, is the real reason to win Putin's favor

Ethereum is an open-source public blockchain platform with smart contract function. It mainly provides decentralized virtual machine to process point-to-point contracts through its special encrypted currency Ethereum, which is fast and unlimited in quantity. In other words, it is a monetary payment system, but their functions and purposes are different

if bitcoin is considered to be a shared global book that securely records all bitcoin bills. Then Ethereum is to maintain a shared computing platform, which can flexibly and safely run any program users want. Because of this, many countries and enterprises are developing how to use Ethereum technology in the real world

the latest price of eth on btctrade platform of bitcoin trading network is ￥ 2430! The increase is amazing

blockchain Ethereum is widely used

at present, the application of Ethereum technology in Russia is still relatively positive. For example, veb, the state-owned Development Bank of Russia, began to apply Ethereum technology to some administrative functions last week, and Russian steel giants are also testing the application of Ethereum in the safe transfer of international letters of credit. Therefore, Putin believes that this virtual currency can help Russia diversify its economy and support the paving of the way by blockchain technology and the establishment of new businesses

not only Russia, JPMorgan Chase, Microsoft, Intel and others are optimistic about Ethereum technology. At the same time, Ethereum has also been paid close attention by some financial institutions, banking consortia, Samsung, IBM and other large companies, resulting in the simplification and automation of financial transactions, merchant loyalty index tracking, customer satisfaction index tracking, customer satisfaction index tracking, etc Blockchain applications such as gift cards are designed to achieve decentralization of electronic transactions. That's why the etheric currency is rising

the future of ether coin

of course, different from Ethernet, there are 670 bitcoin ATMs in the world, and thousands of outlets support bitcoin payment, but Ethernet has not yet emerged in the field of electronic payment. Mainly used to support the Ethereum network to run the program. Therefore, whether bitcoin will be recognized in the future is still unknown, but what Russian President Vladimir Putin has done may not be a signal

we have said before: it is still difficult to define bitcoin as currency, but it must be an asset, and I think Ethereum must be an asset. Although the application of blockchain technology is not yet mature, in a sense, it will be used sooner or later. After all, in the future era of big data, blockchain technology can better protect the efficiency and privacy of our information

this is why digital currency Ethereum is so popular

hope to adopt

3. According to the requirements of the manual, first measure whether the red and green lines correspond to the L1 of the interface; Is the yellow and black line corresponding to L2? If so, it must be the correct connection. Although the telephone line can be divided into positive and negative poles, the terminals can be connected at will, so there is a rectifier directional circuit inside the telephone. Even if the L1 and L2 lines are wrongly connected, the equipment will not be burnt out, so you can safely and boldly test.

4. Currency price will be affected by instry and policy. Today, influenced by the good news, the price of Ethereum has risen by more than 20% to US $149. If you want to invest in Ethereum, you can go to a professional digital currency exchange to invest. At present, all the mainstream digital currency transactions in the market are coin security, fire coin network, bitnet, etc.

5. This is not very clear, because the research team in the central bank's digital currency is generally the relevant personnel of the central bank departments and their think tanks. As early as 2014, domestic banking institutions began to study digital currency
at present, the central bank's research on digital currency is still at an early stage, and it only plans to launch digital currency, but it is still far away from issuing digital currency. When the central bank studies digital currency, it may study the existing mainstream digital currencies such as bitcoin, Ruitai, dogcoin, etc.

6. Ethereum is a blockchain. Compared with bitcoin, it can increase smart contracts, complete Turing and faster network speed
etherem has a lot of block chain procts with regional centralization, such as digix, gold Internet of things and so on.

7. Solid content

8. GMCC, a public chain, can be directly exchanged for Ethereum

9. First of all, there is no fault alarm light, in addition, online diagnosis, you can also write a detection program, using the address in eth001, test output, input.