Ens on Ethereum
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Ethereum is an open source public blockchain platform with smart contract function, which provides decentralized virtual machine (Ethereum virtual machine) to process point-to-point contract through its special cryptocurrency Ethereum
the concept of Ethereum was first proposed by vitalik buterin, a programmer, from 2013 to 2014, inspired by bitcoin, to the effect of "next generation cryptocurrency and decentralized application platform", and began to develop through crowdfunding in 2014. The market value of Ethernet currency is second only to bitcoin, and it is the second largest encrypted digital currency in the world
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bitcoin has created the first decentralized cryptocurrency, and has fully tested the feasibility and security of blockchain technology in more than five years. In fact, bitcoin's blockchain is a set of distributed database. If a symbol bitcoin is added into it and a set of protocol is specified, the symbol can be transferred safely on the database without trusting a third party. The combination of these features perfectly constructs a currency transmission system bitcoin network
however, bitcoin is not perfect, and the scalability of the protocol is a deficiency. For example, there is only one symbol in the bitcoin Network - bitcoin, and users can't customize other symbols. These symbols can represent the company's stocks or debt certificates, which will lose some functions
In addition, a stack based scripting language is used in bitcoin protocol. Although this language has some flexibility to realize functions such as multi signature, it is not enough to build more advanced applications, such as decentralized exchanges. Ethereum is designed to solve the problem of insufficient scalability of bitcoinI. the meaning of blockchain
in a narrow sense, blockchain is a kind of chained data structure composed of data blocks connected in sequence according to the time sequence, and it is a distributed account book that can not be tampered with and forged by means of cryptography
broadly speaking, blockchain technology is a new distributed infrastructure and computing paradigm, which uses blockchain data structure to verify and store data, uses distributed node consensus algorithm to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses intelligent contract composed of automated script code to program and operate data
ENS is Ethereum domain name service, a distributed, open and extensible domain name system based on Ethereum. Some hash addresses used in Ethereum ecosystem are usually very long, such as Ethereum wallet address and swarm file hash address, while ENS domain name system is designed to provide users with short and easy to read domain names. Ens does not grant any trademark or declare any ownership. The domain name application of ENS is a completely decentralized process. The domain name is not obtained through purchase. You need to deposit a certain amount of ether coin in the corresponding registration contract as a deposit for at least one year. In order to avoid garbage and meaningless operation, the process of auctioning domain names includes locking deposit and destroying penalty, trying to ensure that the domain name will be registered by the actual user. The ether money spent in the process will eventually be returned to the successful bidder and destroyed in breach of contract. It will not generate income and is completely non-profit.
transfer eth, as long as there is an address, you can transfer it out
mnemonic words are things that you can help to find when you forget your key, not related to money collection.
In the new version of CentOS 7, there is another set of rules for the number of network card. The code number of network card is related to the source of network card
1, eno1: represents the network card built in the main board BIOS
2, ens1: represents the PCI-E network card built in the main board BIOS
3, enp2s0: PCI-E independent network card
4, eth0: if none of the above is used, Then return to the default network card name
ens32, which belongs to the second type, that is to say, the network card is a built-in PCI-E network card
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PCI network card can not only realize the physical connection and electrical signal matching with LAN transmission medium, but also involve the functions of frame sending and receiving, frame encapsulation and unpacking, medium access control, data encoding and decoding, data caching, etc
PCI-E adopts the point-to-point serial connection which is popular in the instry at present. Compared with PCI and the earlier shared parallel architecture of computer bus, each device has its own special connection. It does not need to request bandwidth from the whole bus, and it can increase the data transmission rate to a very high frequency, reaching the high bandwidth that PCI cannot provide Compared with the traditional PCI bus, which can only realize one-way transmission in a single time cycle, the al simplex connection of PCI-E can provide higher transmission rate and quality, and the difference between them is similar to that between half plex and full plex- eth0 is the default naming method for versions below 7
- in your system, 33 is the correct network card configuration file
- hope to help you, please adopt it, thank you < / OL >
Ens33 is an automatic backup mode, and its name is ens33
there are some rules about the number of network cards. The code of network card is related to the source of network card. Linux inherits the design idea of UNIX based on network, and is a multi-user network operating system with stable performance
1. Eno1: refers to the network card built in the BIOS of the motherboard
2. Ens1: PCI-E network card built in BIOS of motherboard
Enp2s0: PCI-E independent network card4. Eth0: if none of the above is used, the default network card name will be returned
There are many different versions of Linux, but they all use Linux kernel
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the physical layer realizes the reception and transmission of wireless signals, which corresponds to the spread spectrum communication machine in the wireless network card hardware. The physical layer provides the free channel for the MAC layer to estimate CCA information, so as to decide whether the signal can be sent or not. The CSMA / Ca protocol of wireless network is realized through the control of the MAC layer
the wireless network card is used to connect the wireless network, that is, the wireless local area network with radio wave as the information transmission medium. Its use is very similar to that of wired network, and the biggest difference is that the transmission medium is different. Using radio technology instead of network cable can back up with wired network, but the speed is too slow
IEEE802.11a: 5GHz band, transmission speed 54Mbps, incompatible with 802.11b2. IEEE 802.11b: use 2.4GHz band, transmission speed 11Mbps
3. IEEE802.11g: use 2.4GHz band, transmission speed 54Mbps, can be downward compatible with 802.11b
4. Ieee802.11n (draft 2.0): used in Intel's new Centrino 2 notebook and high-end routing, downward compatible, transmission speed 300mbps