What do you think of Ethereum's official website

1.

At present, there are many channels for domestic users to buy Ethereum. Here are some common channels:

< H2 > 1. Coincola is an over-the-counter trading platform for indivials to trade bitcoin

coy Cola is affiliated to Hong Kong coincola limited, which is developed and operated by a professional international team, focusing on providing convenient and reliable blockchain services for global users. Coincola gathers global users and is committed to building a world-class blockchain asset platform

in coy cola, people from different countries can buy bitcoin with their own currency. The seller of the website publishes the advertisement of selling bitcoin, and explains the payment method and exchange rate. You can choose to trade directly online according to the content of the advertisement. Bitcoin is stored in Ke Ying Cola's Internet wallet. You can transfer bitcoin directly

2. How to buy eth

< UL >

register the coincola account, and then click "buy" in the top menu of the home page to enter the advertisement list page

select the appropriate advertisement from the advertisement list and click "buy eth" to enter the transaction page

enter the amount of money to be purchased or the number of digital currency (please understand the message information of the other party, payment method, and transaction instructions of the platform before entering), click buy now, and the order confirmation pop up. After checking and confirming the information, click confirm purchase to enter the order page

in the chat box of the platform, you can inquire whether the other party is online according to the template statement, and make offline payment according to the collection information and collection method provided by the other party

after the completion of offline payment, click the mark that the payment has been completed at the first time (please complete this operation within 15 minutes at the beginning of placing an order, so as to avoid the payment cannot be recovered e to the cancellation of the order e to overtime), and then customize the input information in the chat box to confirm the payment and ask the seller to confirm the collection and release the digital currency

the progress bar in the top column shows that the goods have been received, indicating that the digital currency has arrived in the wallet. Make comments according to the seller's behavior, and click submit to complete the transaction

< / UL > < H2 > 2. C2C trading on trading platform

with the rapid increase in the number of trading platforms and competitive pressure, many trading platforms will have their own C2C trading. Here we take the relatively large ZB trading platform as an example to illustrate

What is C2C

C2C transaction is a customer to customer transaction, which is guaranteed by the transaction platform. There are many such platforms, such as: Fire coin, otcbtc, bitpai OTC, etc., which are guaranteed by the platform and traded between users. We can simply understand it as: our shopping situation on Taobao is the same as that. In case of dispute, the platform will arbitrate. As long as the transaction is carried out according to the normal process, the security of the transaction is guaranteed

2. ZB's C2C business

ZB platform has two choices: QC and usdt. The basic logic is the same. There are many usdt platforms. QC is the feature of ZB, EXX and other platforms. Here we focus on QC

< H2 > about QC

QC is a token. At present, you may know more about usdt and bitcny. At present, there is a special area for QC transaction on ZB. Simply put, QC can buy all other digital currencies (BTC, ETH, EOS, etc.) on ZB. Therefore, after purchasing QC with RMB recharge, you can conct currency transaction on ZB station

The advantage of the < H2 > QC token is that the exchange ratio between the < H2 > < UL >

and RMB is 1:1, which is easier to convert

purchasing other tokens with QC can be directly understood as purchasing RMB, and has an intuitive understanding of the currency price

it takes about half an hour to get to the account. It will take about two hours to get to the account in congestion

ZB platform is relatively reliable, and the reputation of ZB is still very good in the past

How to operate C2C of ZB

< UL >

log in to ZB trading platform and click "C2C trading" on the page

to get to the QC transaction page, you need to first bind your bank card. Then, in the buy QC interface, enter the quantity of QC you want to buy. At present, the ratio of QC to RMB is 1:1. Enter the purchase quantity and click "buy now"

after clicking "buy now", you will be prompted to complete the payment within 30 minutes. At the same time, payment information is generated. Please note that the payment must be made according to the prompt

< / UL > < H2 > official statement:

business processing time 9:00-21:00. Non processing time orders will be processed at 9:00 the next day, and the payment will be completed within 24 hours after receiving the order

this means that the merchant you paid will transfer QC coin to your account within 24 hours. According to my experience, you can get to the account in 2 hours ring the day

< H2 > the following points should be paid attention to:

1) make sure to use the newly bound bank card for transfer and payment

2) note information (that 6 digit) must fill in

3) do not use Alipay, WeChat and other transfers. p>

4) do not fill in the opposite account incorrectly

< UL >

about 1-2 hours, you can check whether your QC has arrived in the financial center

after the account is received, you can trade in the "QC" zone of the "spot trading". You can choose the transaction you want to buy and buy the order

2.

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

3. Just focus:
you can't retrieve your assets through Ethereum block query
think too much
if you want to check the real estate,

you can go to the real estate transaction registration center.

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. The withdrawal of digital currency generally only occurs on the digital currency trading platform. Where to withdraw cash? It is suggested to check the account number of the accounting platform carefully. It is generally in the personal center. The specific situation still needs to consult the official personnel, and the answer given by the official shall prevail. However, when choosing a digital currency trading platform, it is better to choose a big platform such as Xigu digital asset trading platform and bitcoin China.

6. Introction: the company is a subsidiary of China Galaxy Securities Co., Ltd. in Hong Kong.

7. The specific algorithm of handling charge of galaxy securities trading is as follows:
1. Stamp ty: 1 ‰ of transaction amount. At present, it has changed from bilateral levy to unilateral levy on the seller. The tax paid by investors to the finance and taxation department after the transaction. Shanghai stock and Shenzhen stock are paid at 1 / 1000 of the actual transaction amount, and the tax is dected by the securities dealers and paid by the exchange. Bond and fund transactions are exempt from this tax
2. Securities supervision fee (commonly known as three fees): about 0.2 ‰ of the transaction amount, and there is a mantissa in fact, which is generally omitted as 0.2 ‰
3. Securities transaction handling fee: a share, 0.087 ‰ is charged bilaterally according to the transaction amount; For B shares, 0.0001% will be charged bilaterally according to the turnover; Fund, bilateral charge 0.00975% according to turnover; For warrants, 0.0045% will be charged bilaterally according to the turnover
4. Transfer fee (only for Shanghai stock): This refers to the fee to be paid for changing the account name after the stock transaction. Due to the different operation modes of the two exchanges in China, the Shanghai stock exchange adopts "central registration and unified custody", so this fee is only paid by investors in Shanghai stock and fund transactions, but not in Shenzhen stock transactions. The fee shall be paid at one thousandth of the face value (per share) of the traded shares, and less than 1 yuan shall be charged at 1 yuan
5. Commission for business transactions: the maximum is 3 ‰ of the transaction amount, and the minimum is 5 yuan. Commission for a single transaction less than 5 yuan will be charged as 5 yuan
the content of this article comes from: financial code of the people's Republic of China: application edition, China Law Press

8. Highlights
the Ministry of Ecation said that it will increase investment in art ecation this year and hold a National School Aesthetic Ecation Conference on the 21st< In recent years, Zhejiang, Anhui, Guangdong and other provinces have launched provincial environmental supervision, focusing on thermal power, steel, cement, glass, waste incineration and other instries
the Hang Seng ah premium index closed at 122.58, a new low in the last 10 months. Analysts believe that the ah share price gap will further narrow with the expansion of interconnection< It is estimated that the global gold demand and supply will rise by 1.5% and 0.5% respectively this year, and the gold price will break through in the second half of this year
04
major events
- the first digital China Construction Summit is about to be held in Hainan. We need to implement the strategy of
among the listed companies, gaoweida (300465) acquired 100% equity of Hainan nut creative Entertainment Information Technology Co., Ltd., which used big data analysis technology to build a mobile advertising platform characterized by hardware. Aofei data (300738) is the core provider of IDC (Internet Data Center Service), and Haikou Jinlu data center is under construction
● Alibaba's first shopping center will be opened soon, and the online and offline shopping centers will be fully integrated
the third phase of qinchengli shopping center in Hangzhou Xixi park will be officially opened on April 28. This is the first shopping center of Ali's new retail, which records consumers' purchase preferences through collection and storage. At the same time, Ali will implement new technologies such as "face brushing consumption", "zero burden shopping", "ar shopping guide" and "thousands of people and thousands of noodles" magic fitting in this project, so as to realize a new mode of online integration and offline (Omo), All brands of the shopping center are jointly operated online and offline to explore new retail brands of the Internet
comments: among the listed companies, Nan property (603506) qinchengli is the first commercial project of "light asset export management". Visionary (002841) has become the first hardware service provider of Alibaba new retail, jointly building the landing ecology of smart stores. Dashi intelligence (002421) has cooperation with ALI Alipay.
> Internet plus medical health policy will fall to the ground, and the demand for hospital information will rise
comment: electronic medical records, medical technology, information platform, grading treatment system, and big data analysis, cloud platforms and other high grade procts demand began to rise. Neusoft group (600718), Weining health (300253) and other listed companies have won relevant software projects in hospitals< More than 10 billion yuan of integrated circuit projects are contracted intensively, and consumables and equipment are the key points.
comments: there is a big gap between China and foreign advanced level in the field of semiconctor equipment and materials. With the proction of wafer factories, it is an inevitable trend to localize supporting semiconctor materials. We are optimistic about Jingrui (300655) and jianghuawei (603078), which are mainly engaged in wet electronic chemicals, And Shanghai Xinyang (300236) and other companies that have been invested by large funds<
05
policies and instries point to hot spots
Hainan explores and develops competitive sports lottery
mining Hainan lottery stocks: Aijian group (600643), Xinhualian (000620)
Hainan needs to implement big data strategy as a whole
Hainan big data concept stocks: aofei data (300738), gaoweida (300465)
Ali's first shopping center is about to open, Full integration of online and offline
Alibaba's new retail concept stocks: Nan property (603506), Shiyuan shares (002841), Dashi intelligent (002421)
- Alibaba is about to release its cloud communication procts
cloud communication concept stocks: Beiwei Technology (002148), mengwang group (002123), 263 (002467), etc Tianji Technology (300245)
panel manufacturers speed up the layout of 8K screen
8K screen concept stocks: precision electronics (300567), East China Technology (000727), BOE a (000725), shentianma a (000050)
indivial stock gold rush
> Huarui shares (300626) annual net profit increased by 44% year on year, and it is planned to transfer 10 shares to 8 shares and send 1 yuan< According to the information development (300469) annual report, it is planned to pay 1 yuan for 10 transfers and 8 transfers< The annual net profit of Shandong mining machinery (002526) increased by 567% year-on-year, and it is planned to turn 10 to 7< The annual net profit of Jianfa shares (600153) increased by 17%, and the holding of securities fund increased to 4.9% from 3.61% at the end of last three quarters
> Huayu automobile (600741) participated in the IPO of Yap automobile, and the company's shareholding accounted for 33.90% of the total share capital of Yap automobile before the IPO
> Tengda construction (600512) won the bid of 1.17 billion yuan civil construction project, accounting for 32.6% of the revenue in 2017
07
comments on leading stocks
Desheng technology-002908
comments: moreover, this vote resonates with the index in time sharing, which also belongs to the different to consistent seal back, so it is inevitable to enjoy the premium. The current objective disk situation, the strongest main line is undoubtedly Hainan, but not how to give opportunities. Digital China is an auxiliary line for diverting funds, which resonates with the index at the end of the day, but it is difficult to judge whether to take advantage of the situation or build up the momentum. It still depends on the situation.

9. 如何快速辨别网卡ID与物理网卡的对应关系
一般购买的服务器都有4个网卡，这个时候在安装好服务器后，配置IP的时候就郁闷了
如是一个浪潮8560M2服务器安装Redhat后的网卡显示：
[root@DBSERVER51 ~]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:E0:ED:2D:0F:58
inet addr:192.168.4.10 Bcast:192.168.4.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:40428 errors:0 dropped:0 overruns:0 frame:0
TX packets:392 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3413500 (3.2 MiB) TX bytes:44521 (43.4 KiB)
Memory:faee0000-faf00000

eth1 Link encap:Ethernet HWaddr 00:E0:ED:2D:0F:59
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Memory:fae60000-fae80000

eth2 Link encap:Ethernet HWaddr 00:25:90:5A:15:B6
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Memory:fafe0000-fb000000

eth3 Link encap:Ethernet HWaddr 00:25:90:5A:15:B7
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Memory:faf60000-faf80000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:10 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:660 (660.0 b) TX bytes:660 (660.0 b)
从一个机房搬下来时，忘记标记了这个时候还是想修改eth0作为通信口但是一个一个插拔比较麻烦，于是就想能不能有个好办法，毕竟Linux不像Windows那样直观，打开网络连接就可以看到这个时候就要用到ethtool这样一个命令，命令详解如下：
命令描述：
ethtool 是用于查询及设置网卡参数的命令
ethX是以太网卡的名称，Linux系统将检测到的第一块以太网卡命名为eth0, 第二块为eth1,…….
使用概要：
ethtool ethx //查询ethx网口基本设置，其中 x 是对应网卡的编号，如eth0、eth1等等
ethtool –h //显示ethtool的命令帮助(help)
ethtool –i ethX //查询ethX网口的相关信息
ethtool –d ethX //查询ethX网口注册性信息
ethtool –r ethX //重置ethX网口到自适应模式
ethtool –S ethX //查询ethX网口收发包统计
ethtool –s ethX [speed 10|100|1000] [plex half|full] [autoneg on|off] //设置网口速率10/100/1000M、设置网口半/全双工、设置网口是否自协商
ethtool [ -a | -c | -g | -i | -d | -k | -r | -S |] ethX
ethtool [-A] ethX [autoneg on|off] [rx on|off] [tx on|off]
ethtool [-C] ethX [adaptive-rx on|off] [adaptive-tx on|off] [rx-usecs N] [rx-frames N] [rx-usecs-irq N] [rx-frames-irq N] [tx-usecs N] [tx-frames N] [tx-usecs-irq N] [tx-frames-irq N] [stats-block-usecs N][pkt-rate-low N][rx-usecs-low N] [rx-frames-low N] [tx-usecs-low N] [tx-frames-lowN] [pkt-rate-high N] [rx-usecs-high N] [rx-frames-high N] [tx-usecs-high N] [tx-frames-high N] [sample-interval N]
ethtool [-G] ethX [rx N] [rx-mini N] [rx-jumbo N] [tx N]
ethtool [-e] ethX [raw on|off] [offset N] [length N]
ethtool [-E] ethX [magic N] [offset N] [value N]
ethtool [-K] ethX [rx on|off] [tx on|off] [sg on|off] [tso on|off]
ethtool [-p] ethX [N]
ethtool [-t] ethX [offline|online]
ethtool [-s] ethX [speed 10|100|1000] [plex half|full] [autoneg on|off] [port tp|aui|bnc|mii] [phyad N] [xcvr internal|external]
[wol p|u|m|b|a|g|s|d...] [sopass xx:yy:zz:aa:bb:cc] [msglvl N]
标志
-a 查看网卡中 接收模块RX、发送模块TX和Autonegotiate模块的状态：启动on 或 停用off
-A 修改网卡中 接收模块RX、发送模块TX和Autonegotiate模块的状态：启动on 或 停用off
-c display the Coalesce information of the specified ethernet card
-C Change the Coalesce setting of the specified ethernet card
-g Display the rx/tx ring parameter information of the specified ethernet card
-G change the rx/tx ring setting of the specified ethernet card
-i 显示网卡驱动的信息，如驱动的名称、版本等
-d 显示register mp信息, 部分网卡驱动不支持该选项
-e 显示EEPROM mp信息，部分网卡驱动不支持该选项
-E 修改网卡EEPROM byte
-k 显示网卡Offload参数的状态：on 或 off，包括rx-checksumming、tx-checksumming等
-K 修改网卡Offload参数的状态
-p 用于区别不同ethX对应网卡的物理位置，常用的方法是使网卡port上的led不断的闪N指示了网卡闪的持续时间，以秒为单位
-r 如果auto-negotiation模块的状态为on，则restarts auto-negotiation
-S 显示NIC- and driver-specific 的统计参数，如网卡接收/发送的字节数、接收/发送的广播包个数等
-t 让网卡执行自我检测，有两种模式：offline or online
-s 修改网卡的部分配置，包括网卡速度、单工/全双工模式、mac地址等