Ethereum lettering

1. This concept was proposed in the white paper [1] of Nakamoto Tsung, who created the first block, namely "Genesis block"< On January 3, 2009, the founder of bitcoin, Mr. Nakamoto, left an unchangeable sentence in the genesis block:
"the times 03 / Jan / 2009 Chancellor on brink of second low for banks (on January 3, 2009, the chancellor of the exchequer was on the verge of implementing the second round of bank emergency assistance)."
at that time, the British Chancellor of the exchequer, darling, was forced to consider a second attempt to relieve the banking crisis, which was the headline of the front page article of the times that day
the time stamp service and existence proof of blockchain, the time generated by the first blockchain and the events that happened at that time are permanently preserved
BTCC, a bitcoin company, launched a service "Millennium chain" in 2015, namely blockchain lettering service, which is based on the above principles. Users can use this service to engrave text on the blockchain and save it permanently
bitcoin, Ruitai coin, Laite coin, dogcoin, Ethereum and other digital currencies will use blockchain technology.

2. Blockchain is an important concept of bitcoin. It is essentially a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of information about bitcoin network transactions, Used to verify the validity of its information (anti-counterfeiting) and generate the next block.

3.

This is a Linux system IP address configuration command. The specific meaning is:

set the IP address of the system to 192.168.0.2; The subnet mask is 24, that is 255.255.255.0; The broadcast address is 192.168.0.255; The name of NIC device is eth0

all computers in the network must set a unique IP address to communicate normally. Because of this unique address, users can select the objects they need from thousands of computers efficiently and conveniently when they operate on networked computers

The IP address is just like our home address. If you want to write to a person, you need to know his or her address so that the postman can deliver the letter. A computer sending information is like a postman. It must know the only "home address" to avoid sending the letter to the wrong person. But our address is expressed in words, the address of the computer is expressed in binary numbers

eth0 is the name set by the system for the network card. If there are al network cards or multiple network cards, there will be names like eth1 and eth2. The name can be set artificially. It is the unique name of the network card in the current computer system

< H2 > after modification, you can use ifconfig command to check whether the modification is successful

4. The test of physical and mechanical properties of metal materials generally includes strong load, tensile strength, upper yield strength, lower yield strength, elongation at break, yield strength at break and maximum force at break. Generally used is the private electronic tensile testing machine (the most accurate precision) or hydraulic tensile testing machine, the standard depends on customer service needs, GB, JIS, ANSI, DIN, BSI
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5.

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6. There are 5 stations from Nanshaomen station to longshoucun station. From the north railway station to the exhibition center, the ticket price is 4 yuan and the starting price is 2 yuan. At present, there are three kinds of subway tickets on sale: 2 yuan, 3 yuan and 4 yuan. Among them, 2 yuan is for stations within 6, 3 yuan is for stations 7-11, and 4 yuan is for stations above 11. Chang'an Tong takes 10% off the subway and can recharge at the subway station One passenger and one card with changantong card]

7. You can call 114 to find out the telephone number of the bus company, so that you know the telephone number, and then you can call to ask which side of Xi'an No. 208 bus is in yanxingmen subway station, they will tell you, so you know.