Bitcoin blockchain bill
bitcoin, Ruitai coin, Laite coin, dogcoin and other digital currencies all use blockchain technology.
blockchain technology is not only the underlying technology of bitcoin, but also the core and infrastructure of bitcoin bitcoin has been running without any centralized organization operation and management. Later, bitcoin technology was abstracted, which was called blockchain technology or distributed ledger technology
extended data:
disadvantages of blockchain technology applied to digital currency:
first, there is no circulation management organization for "decentralization" blockchain technology is essentially a distributed database system with one-way linked list logic structure and P2P network design mode, which determines that there is no unified central control system for virtual currency based on blockchain technology
Second, it is difficult to effectively control the quantity supply the circulation of virtual currency based on blockchain technology is fixed, and according to Fisher Equation, the total transaction volume of the whole society under a certain price level in a certain period has a certain proportion with the required nominal currency volume, while the constant currency volume obviously can not meet the requirements of the growing total price of social goods Thirdly, "mining mechanism" is difficult to create recognized value bitcoin itself has no value and no national credit support. Some people think that "by continuously consuming computing power and energy to inject value into virtual currency", but it is obviously not the most efficient choice to consume millions of calculations in order to find a hash value that meets the requirements Fourthly, procers and early holders are easy to get high seigniorage any virtual currency based on blockchain technology is held by a few people at the initial stage of its development. Take bitcoin as an example. At first, bitcoin was only a proct of a few people's game. The first bitcoin purchase in May 2010 was $10000 BTC's purchase of $25 pizza. The first bitcoin transaction completed in July of the same year was $0.04/btcand then apply for Yudian terminal security system
and then use the Tencent Yudian to kill the virus
This is a data center switch, which supports virtualization, that is VSU. Configuration reference
core switch 1:
Switch1 # configuration terminal
enter configuration commands, one per line. End with cntl / Z.
Switch1 (config) # switch virtual domain 1
Switch1 (config vs domain) # switch 1
Switch1 (config vs domain) # switch 1 priority 200 -- & gt; The default priority is 100, which is configured as a higher priority. After the VSU is successfully established, it will become the management host
Switch1(config-vs-domain)# exit
Switch1(config)# vsl-aggregateport 1 ------> At least two VSL links are needed, and the reliability of one link is low. When link oscillation occurs, VSU will be very unstable
Switch1(config-vsl-ap-1)# port-member interface TenGigabitEthernet 1/1 ------> Configure VSL link, heartbeat link and traffic channel between VSU active and standby cores
Switch1 (config-vsl-ap-1) ﹥ port member interface tengigabit Ethernet 1 / 2
Switch1 (config-vsl-ap-1) ﹥ exit
core switch 2:
switch2 ﹥ configuration terminal
enter configuration commands, one per line. End with CNTL/Z.
Switch2(config)# switch virtual domain 1 ------> Domain ID must be consistent with the first one
switch2 (config vs domain) # switch 2 ----- & gt; The second device must change its ID to 2
switch2 (config vs domain) ｛ switch 2 priority 150
switch2 (config vs domain) ｛ exit
switch2 (config) ｛ VSL aggregateport 1 ----- & gt; At least two VSL links are needed, and the reliability of one link is low. When link oscillation occurs, VSU will be very unstable
Switch2(config-vsl-ap-1)# port-member interface TenGigabitEtherne 1/1 ------> Configure VSL link, heartbeat link and traffic channel between VSU active and standby cores
switch2 (config-vsl-ap-1) # port member interface tengigabit Ethernet 1 / 2
switch2 (config-vsl-ap-1) # exit
bookkeeping is done by miners
generally speaking, the correct result of Distributed Accounting is decided by the vote of "miners"
if you have a 51% pool, you can theoretically void any transaction (roll back). This is called a 51% attack
now bitcoin miners are distributed all over the world. The world's largest mine pool is in China, and the person in charge of bitcoin has promised that its total power will not exceed 50% (now about 30%), so there is no possibility of 51% attack for the time being
but it can't be said to conquer