Ethereum 0x0000 address

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. Many people are optimistic about the decentralized exchange. The private key is in their own hands and they enjoy complete control over the user's assets. However, e to the congestion of Ethereum's public chain, the trading experience of the decentralized exchange on Ethereum is not very good and slow. At present, the most promising is the X protocol, but if the problem of Ethereum is not solved, its application problems can not be started at all
in comparison, the decentralized exchange based on EOS is much better, because its TPS is fast enough to handle the decentralized application at the present stage, and its speed is much better than that on Ethereum. Whaleex, in particular, is very smooth in use, with fast transactions. It is not inferior to those centralized exchanges. Among all decentralized exchanges, whaleex is excellent
therefore, I think the decentralized exchange on EOS may break out faster than that on Ethereum, especially the whale exchange, which will be a dark horse. The smart contract of their home is also the only one that has passed the slow fog security audit. The security is particularly high and the use is assured.

3. Ethereum is an open source public blockchain platform with smart contract function. Ethernet provides decentralized virtual machine to process point-to-point contract through its special cryptocurrency

4. I've just seen Percy Jackson and the robber of divine fire. It's a bit like Harry Potter, but I think it's very good-looking. It's a story with Greek mythology
Percy Jackson is an ordinary 12-year-old boy who was diagnosed with dyslexia and hyperactivity disorder. During a field trip organized by the school, he was interviewed by his algebra teacher; Specific function & quot; Scared me. After that, Percy Jackson found that he was not an ordinary person, but a mythical figure and a descendant of human beings< After discovering the mystery of his life, Percy Jackson was sent to a special school. The children studying in this school are the offspring of many mythical characters. When Percy Jackson came to school, Poseidon immediately declared Jackson his own child. In this school, Percy Jackson met two good friends. One is the beautiful Annabeth chase, the descendant of Athena, the goddess of wisdom and skill; The other is Grover Underwood, a descendant of orcs. Not long in the school, Percy Jackson was accused by the gods of stealing the thunder rod of Zeus. Percy Jackson is required to hand over his thunder wand within 10 days, otherwise, his mother will be killed by these gods, and the war between the gods is inevitable...

there is still one minute left: three discriminated high school students have invented a time machine that allows them to go back in time and change their social status, And help other unfairly treated children to avoid the humiliation of discrimination in high school
twilight 2, new moon and 1 are about vampires. Bella (Kristen Stewart) is 18 years old and her father gives her a gift. Edward (Robert Pattinson) shows her love generously and tells her the legend of the Italian vampire king. Edward's red haired sister Alice (Ashley Greene, Ashley Greene) holds a birthday party specially for Bella. During the party, Bella accidentally cuts her arm and is attacked by Gaspar. Only with Edward's protection can she escape. However, since then, Edward graally alienated Bella and proposed to break up. This makes Bella cold, but Edward also has difficulties, still secretly protect Bella. Bella is in the empty window period, and her old friend Jacob (Taylor Lautner) makes a warm call, which makes their relationship warm up. Since then, Bella because of the cliff rescue, just know that Jacob is a werewolf, specialized in dealing with vampires. At the same time, Edward, who didn't know about it, thought Bella had committed suicide and was disheartened. He came to Italy to ask the royal family to end his life...

bloodthirsty daybreak, I think the ending is a little ironic
2012 is also very good, and the fantasy show of Arthur and his mini kingdom is also very good

5.

bus line: Metro Line 2, the whole journey is about 16.1km

1. Walk about 130m from Shanghai Hongqiao Station to Hongqiao Railway Station

2. Take Metro Line 2, after 8 stops, to Jing'an Temple Station

3. Walk about 950m to Shanghai Exhibition Center

6. Tokenlon is a sub brand of consenlabs. At present, tokenlon includes two moles, IEX and DEX, which are the flash exchange function based on kyber network and the currency exchange function based on 0x protocol.

7.

This prompt means that the MAC address of the network port has changed, but the device name has not changed. As a result, the device name and MAC address cannot match, and Linux cannot mount the network port. In other words, the MAC address in the configuration file of the network port does not match the actual MAC address of the network port

this situation generally occurs when the virtual machine migrates or the network card is replaced. The solution is as follows:

1: record the actual address of the network port, Execute ifconfig eth0

{rrrrrrr}

where hwaddr is followed by the actual MAC address of Ethernet port

2: change the MAC address in the configuration file

open the Ethernet port configuration file of eth0 / etc / sysconfig / network scripts / ifcfg-eth0

(the address may vary with different operating systems)

look for hwaddr = in the file, If not, add a new line. Change the value after this line to the MAC address value you see in the first step, for example, hwaddr = & quot; 00:0C:29:2D:2D:CF"， Then save and exit

3: restart the network card through service network restart, or start the network card through ifup eth0 (this command will check the configuration file)

8. As far as the interest rate increase cycle of the Federal Reserve is concerned, there has been a serious differentiation in the orientation of monetary policy e to the obvious inconsistency in the pace of economic recovery in developed economies. This differentiation begins with the Fed's QE exit and the European Central Bank's negative interest rate era, which will have a different complex impact on the future global liquidity situation
this will put some pressure on China's monetary policy. The short-term and local ischemia phenomenon caused by capital return may rece the market liquidity. At the same time, the decline of commodities brought about by the rise of the US dollar will lead to imported inflation, which will further rece domestic inflation expectations, thus giving the central bank more room to cut interest rates and reserve requirements. The combination of the two will make the central bank's monetary policy more relaxed in essence, even as some big institutions predict that there will be a rection in interest rates and reserve requirements in the future.

9. Hello, I'm glad to help you,
first buy a PS3 4000 hard disk bracket on Taobao, and then buy a hard disk, which is the preparatory work
then open the top of the PS3 logo

and you will see a pit. Just insert the hard disk, and then format it in PS3.
your adoption is the driving force for me to move forward, and there are still some things I don't understand, Please continue to ask
if you have any other questions, please ask me for help; The answer is not easy, mutual understanding, help each other!