Ethereum test today
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
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
August 3, 2019 - according to the data of hot coin global station, ETH / usdt fluctuated sharply in 5 minutes, rising by more than 1.00% to 1.03%. The current quotation is 223.10 US dollars, the market fluctuates greatly, please pay attention to risk control.
1, decentralization
2, distributed ledger
3, incentive mechanism based on token
developers suggest to start with the development of decentralized application (DAPP), because it has the best development ecology at present. After understanding the idea of blockchain, we can go deep into the underlying technology as needed.
anonymous user's reply
according to the price of Ethereum / Ethereum eth of China bitcoin chbtc on May 4, one Ethereum / Ethereum eth is about 62 RMB. Anonymous user's reply
the current latest currency exchange: 1 RMB = 0.1584 US dollars, and the transaction price is subject to the bank counter<
anonymous user's reply
at present, the price of Ethereum is about $200. Ethereum is a digital currency next only to bitcoin and has a good investment value. The price will definitely rise sharply in the future. Anonymous user's reply
some institutions predicted that Ethereum will rise to $2500 by the end of the year, but it seems unlikely in the current market
domain Kingdom's latest Ethereum price is $166, down 16% from yesterday
although the price of Ethereum continues to decline, there are still many investment opportunities
nowadays, many people invest in Ethereum through virtual currency trading in the realm Kingdom, which is not affected by the rise and fall of prices, but also can invest less money in the shortest time to obtain more profits
- knowledge about the historical trend of bitcoin - in history, bitcoin has experienced three ups and downs
when? What is the reason? I cut it out today
for the first time, bitcoin soared from US $0.75 to US $30 in just two months from April to June in 2011 to 2013. After careful calculation, compared with us $0.0076 when bitcoin was born, it increased by 40000 times. It's too scary
then why does it suddenly rise from 0.75 to $30? It turned out that bitcoin and sterling exchange trading platform went online in those two months
then some mainstream newspapers in the United States began to report on bitcoin, and as soon as the news came out, global investors simply flocked to join the ranks of speculation
at that time, the value of bitcoin was not very obvious. These people had nothing to do when they were full
from June to November of the same year, bitcoin fell from $30 to $2, which was frightening when it rose and even more frightening when it fell, with a 93% decline. It is estimated that the newly added small white vegetables will be scared to death
the root cause of such a sharp decline may be related to the hacker attack on Mt. GOx, the world's largest bitcoin trading platform, in June 2011
hackers certainly won't let go of the rise
from 2013 to 2015, from January to December 2013, bitcoin rose from $13 to $1147, an 88 fold increase
compared with the birth price, it has increased by more than one million times
ring this period of time, hacker attacks also occurred, causing price callback
however, it is still bullish and keeps the price of 1000 US dollars
the main reason for the rise is that the debt crisis in Cyprus has triggered a crisis of trust in traditional financial institutions
then, in the second half of 2013, some European countries introced policies that are beneficial to bitcoin. Well, more and more people know about bitcoin
naturally, speculators will not let go of this opportunity
as soon as these speculators appear, I know that there is nothing good about it. It's not easy to rise, but it's plummeting again
from December 2013 to January 2015, bitcoin dropped from $1166 to $170, a drop of 85%
the reason for the sharp drop is probably related to the notice on preventing bitcoin risks issued by the five ministries and commissions of the central government in December 2013
because bitcoin plummeted 92.5% in 83 days after the announcement
at that time, digital currency was not as influential as it is now< So prevention is right
the third sharp rise and fall, from 2017 to now this period is the most important two years of bitcoin, because bitcoin rose from $789 to $19878 in one year of 2017
24 times increase
compared with the birth price of bitcoin, it has increased by 20 million times
reason: in this year, the underlying technology of bitcoin, blockchain technology, rose strongly, driving the value of bitcoin soaring
at the same time, the outbreak of Ethereum's ICO triggered a surge in bitcoin
twenty thousand dollars has made many people become local tyrants overnight
it's not just speculators. People on the earth know about bitcoin, which will surely attract more vampires and the murderous eyes of many countries
No, it is estimated that a long bear market rarely seen in the history of bitcoin will come
since December 17, bitcoin has been in a bear market, falling from $20000 to more than $6000
the decline of 60% makes many people begin to doubt their life
there are many reasons for this decline. Global regulation has become stricter, exchanges have been attacked all the time, and the vulnerable hearts of investors are under heavy pressure
Ethereum exchange rate for RMB Ethereum Network & quot
the above is the relevant Q & A of "Ethereum exchange rate for RMB - Ethereum network". I hope it is helpful to