PHP Ethereum Web3 transfer interface
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
-
with the recent sharp fluctuation of currency prices, a new profession, commonly known as "brick moving", is graally emerging in the circle. These brick moving workers pay close attention to the major bitcoin and Ethereum transactions every day. Once they find the price difference, they buy bitcoin and Ethereum from the low price and sell them from the high price to make profit
-
with the increasing number of bitcoin and Ethereum transactions, according to incomplete statistics, the number of current international mainstream bitcoin transactions is graally increasing. Different from A-share and other stock markets, the stock price is globally unified. For example, the stock price of technology has the only pricing in Hong Kong stock market. However, the prices of bitcoin and Ethereum are determined by the transaction itself. Because Ethereum has a large number of transactions and different transaction volumes, the transaction price is very likely to fall. When the price fall is large, it can even reach 8% ~ 10% of Ethereum's price. At this time, many porters have the opportunity to move bricks. The so-called "brick" of moving bricks refers to Ethereum. Porters buy Ethereum from the low price and then transfer it to the high price to get the price difference
-
for example, the recent sharp fluctuations in bitcoin and Ethereum markets are a good time to move bricks. Generally speaking, as long as there is a price difference of 5-50 yuan between bitcoin and Ethereum, it is worth moving bricks. However, moving bricks also requires certain transfer costs and labor costs. Sometimes, the withdrawal of bitcoin purchased from low price will not arrive so quickly. In order to speed up the transaction speed and rece the risk of price fluctuation, the porter usually has a turnover of bitcoin. For example, after purchasing bitcoin and Ethereum from a, he immediately transfers the same amount of bitcoin from his wallet to B for sale, After the completion of bilateral transactions, graally withdraw the funds into their wallets, waiting for the next time to move bricks. If you have both cash and bitcoin and Ethereum, it's the safest. You can pay at a low price and register at a high price, and then trade at the same time. The transaction can be completed in a few seconds. At this time, there is little risk in moving bricks, and what you get is pure profit. When the price of bitcoin fluctuates greatly, part of the price response is not so fast, and the profit of moving bricks is the highest
-
2. Adopt large-scale high-end cloud computing, short or long currency transactions all over the world (low absorption and high selling), complete the transaction within 0.28 MS, and increase the value by floating trading point without upper limit, so as to ensure the dividend appreciation of each person
-
3. They use the money of the participants to earn profits, and then give 50% to the participants, from Monday to Friday, and do not distribute on weekends. How much you earn depends on whether you have a big package or a small one
-
if you have any questions, please let me know. 5: 185 plus 654 and 39360
< / OL >
Ethereum specifies the JSON RPC API application development interface that each node needs to implement. This interface is transport independent. Applications can use this interface protocol to operate Ethereum nodes through HTTP, websocket or IPC and other communication mechanisms:
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
the working principle of nativscript: calling native API with JavaScript to realize cross platform
nativscript is a cross platform solution recently launched, which allows you to directly write Android and IOS local applications with JavaScript, It will be extended to Windows platform in the future. It's a project that has received more attention recently. It is essentially different from NW (formerly known as node WebKit, using web to write winodw / Linux desktop application) and phonegap embedded WebView to write app. It calls the system native API directly with JavaScript, so it has some native application characteristics.