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Huasheng College blockchain digital currency innovation
Publish: 2021-04-29 06:26:11
1. digital currency is abbreviated as digiccy, which is the abbreviation of "digital currency" in English. It is an alternative currency in the form of electronic currency. Both digital gold coin and cryptocurrency belong to digiccy
digital currency is different from the virtual currency in the virtual world, because it can be used for real goods and services transactions, not limited to online games. The early digital currency (digital gold currency) is a form of electronic currency named after the weight of gold. Today's digital currency, such as bitcoin, lightcoin and ppcoin, is an electronic currency created, issued and circulated by check sum cryptography. It is characterized by the use of P2P peer-to-peer network technology to issue, manage and circulate currency. In theory, it avoids bureaucratic examination and approval, so that everyone has the right to issue currency.
digital currency is different from the virtual currency in the virtual world, because it can be used for real goods and services transactions, not limited to online games. The early digital currency (digital gold currency) is a form of electronic currency named after the weight of gold. Today's digital currency, such as bitcoin, lightcoin and ppcoin, is an electronic currency created, issued and circulated by check sum cryptography. It is characterized by the use of P2P peer-to-peer network technology to issue, manage and circulate currency. In theory, it avoids bureaucratic examination and approval, so that everyone has the right to issue currency.
2. It should be fake. blockchain and other tokens are prohibited in China. So what can you do with the blockchain procts you buy? If it doesn't exist, it's not worth a cent. Where do you make money from.
3. Computer science and technology
software engineering
information and computing science
information technology
information security
these majors are possible to learn, and the curriculum of each school is different
software engineering
information and computing science
information technology
information security
these majors are possible to learn, and the curriculum of each school is different
4. The issue of bitcoin is determined by the block height, that is, the distance from the No. 0 block of Genesis. Now when the number is reached, the total amount of bitcoin should be limited. After this village, there will be no store. If the miners dig a block but don't receive the reward of the block, the bitcoin will be destroyed forever
coinbase transaction is a special transaction that generates bitcoin "out of thin air". Only miners can write this kind of transaction, and the number of generated bitcoin is limited by rules (new currency reced by half for every 210000 blocks + transaction fee for this block)
however, the rules do not stipulate that the miner must take away all the rewards that can be taken, and can choose not to take them
therefore, a mine pool connected with the RSK side chain has made a bug before, forgetting to take away the reward and occupying a pit in a block for nothing, which is equivalent to destroying the corresponding amount of bitcoin, making the total amount of bitcoin decrease a little bit permanently
in addition, to spend a bitcoin, you only need to specify the transaction ID and output serial number
as like as two peas in multiple blocks repeatedly write identical coinbase transactions, the transaction ID is also repeated.
therefore, this kind of situation also occupies the pit of a block in vain, and permanently destroys the corresponding amount of bitcoin
it seems to me that this is still a security vulnerability, so the new version of bitcoin software later banned the writing of repeated coinbase transactions. But until now, there has been no ban on miners not getting their e rewards
generally speaking, a coin is controlled by a private key. If a coin is transferred to an address where no one knows the private key, it will be destroyed
if the owner does a good job in security, and the private key is not disclosed and cannot be guessed, but he accidentally loses the private key, it is equivalent to destroying all the coins he owns
there are only some special circumstances that require intentional destruction of coins
one is irreversibly converted into another kind of currency, such as the contract currency XCP attached to bitcoin and wormhole cash WHC attached to BCH
the second is to save certificates and data on the chain, such as the time stamp: panbiao.com/2013/08 /
and the crowd funding of the original Ethereum founding team: zhuanlan.hu.com/p/29
the private key is essentially a big number. Whoever knows this number can control the currency on the corresponding address. So the private key must be generated with reliable random number, otherwise it may be guessed and stolen
compared with the token, the address is the hash of the public key. There is no way to judge whether an address has a corresponding public key and private key (even if the public key is known, the corresponding private key cannot be known). Therefore, even if it is explicitly the address of "burned" token, the system does not prohibit the transfer in
strictly speaking, what locks the currency is a small program (script). This program takes the input as the public key and digital signature. First, check whether the public key hash is consistent, and then check whether the digital signature is valid. If it is valid, it will be verified and transfer is allowed; Otherwise, it will be judged that the transaction is illegal and refuse to package into the chain
it is the whole node software that explains and executes this program. It can be said that the software code of the whole node specifically defines a coin
however, the current situation is very embarrassing. Most miners do not run the whole node, only a few mines are running. The vast majority of users do not run the whole node, even if they run the whole node, they can only perform verification, no computing power, no block
coinbase transaction is a special transaction that generates bitcoin "out of thin air". Only miners can write this kind of transaction, and the number of generated bitcoin is limited by rules (new currency reced by half for every 210000 blocks + transaction fee for this block)
however, the rules do not stipulate that the miner must take away all the rewards that can be taken, and can choose not to take them
therefore, a mine pool connected with the RSK side chain has made a bug before, forgetting to take away the reward and occupying a pit in a block for nothing, which is equivalent to destroying the corresponding amount of bitcoin, making the total amount of bitcoin decrease a little bit permanently
in addition, to spend a bitcoin, you only need to specify the transaction ID and output serial number
as like as two peas in multiple blocks repeatedly write identical coinbase transactions, the transaction ID is also repeated.
therefore, this kind of situation also occupies the pit of a block in vain, and permanently destroys the corresponding amount of bitcoin
it seems to me that this is still a security vulnerability, so the new version of bitcoin software later banned the writing of repeated coinbase transactions. But until now, there has been no ban on miners not getting their e rewards
generally speaking, a coin is controlled by a private key. If a coin is transferred to an address where no one knows the private key, it will be destroyed
if the owner does a good job in security, and the private key is not disclosed and cannot be guessed, but he accidentally loses the private key, it is equivalent to destroying all the coins he owns
there are only some special circumstances that require intentional destruction of coins
one is irreversibly converted into another kind of currency, such as the contract currency XCP attached to bitcoin and wormhole cash WHC attached to BCH
the second is to save certificates and data on the chain, such as the time stamp: panbiao.com/2013/08 /
and the crowd funding of the original Ethereum founding team: zhuanlan.hu.com/p/29
the private key is essentially a big number. Whoever knows this number can control the currency on the corresponding address. So the private key must be generated with reliable random number, otherwise it may be guessed and stolen
compared with the token, the address is the hash of the public key. There is no way to judge whether an address has a corresponding public key and private key (even if the public key is known, the corresponding private key cannot be known). Therefore, even if it is explicitly the address of "burned" token, the system does not prohibit the transfer in
strictly speaking, what locks the currency is a small program (script). This program takes the input as the public key and digital signature. First, check whether the public key hash is consistent, and then check whether the digital signature is valid. If it is valid, it will be verified and transfer is allowed; Otherwise, it will be judged that the transaction is illegal and refuse to package into the chain
it is the whole node software that explains and executes this program. It can be said that the software code of the whole node specifically defines a coin
however, the current situation is very embarrassing. Most miners do not run the whole node, only a few mines are running. The vast majority of users do not run the whole node, even if they run the whole node, they can only perform verification, no computing power, no block
5. Strategy for making money by moving bricks against the cold water
you can make all kinds of props, choose fishing, and have a lot of materials. Animal husbandry can raise all kinds of animals and plants for money. Cooking, pharmaceutical, also can proce all kinds of food, medicine, also can change a lot of money. There are many other life deputies who can make money
there are nine life skills in the game, including farming, animal husbandry, mining, medicine collecting, fishing, cooking, brewing, pharmacy and craftsman, all of which can be learned. Craftsman and pharmacy should be the most profitable occupations at present
of course, in the game, players can also set up stalls to sell equipment and weapons they don't need, which is also very fast for money. You have to pay to open a shop.
you can make all kinds of props, choose fishing, and have a lot of materials. Animal husbandry can raise all kinds of animals and plants for money. Cooking, pharmaceutical, also can proce all kinds of food, medicine, also can change a lot of money. There are many other life deputies who can make money
there are nine life skills in the game, including farming, animal husbandry, mining, medicine collecting, fishing, cooking, brewing, pharmacy and craftsman, all of which can be learned. Craftsman and pharmacy should be the most profitable occupations at present
of course, in the game, players can also set up stalls to sell equipment and weapons they don't need, which is also very fast for money. You have to pay to open a shop.
6. The full text centers on the main line of "I" and Susan's communication process, and the context is clear. I started to think that Susan is an omniscient elf living in the telephone. Just dial 105 to get her help. Then write "my" finger was hit by a hammer, in a hurry to dial the phone, got Susan's warm help, had a good impression on her. Then write "I" and Susan chat, Susan always listen to "I" voice with heart, patiently give "I" help and comfort, she became "I" never met the second mother. Finally, when I grew up, "I" used the opportunity to go back to my hometown to get in touch with Susan. On the eve of our appointment, Susan died of illness“ I miss her deeply.
7.
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8. Level 50
from level 1
to level 5
30000
from level 6
to level 15
22500
from level 16 to level 30
15000
after level 31, 7500
running for 30 times, a total of money
60W
level 60
from level 1
to level 5
35000
from level 6
to level 15
26500
from level 16 to level 30
17500
after level 31
8500
give money for 30 runs
70W
grade 70
give money for the first run
40000 for the fifth run
give money for the sixth run
30000 for the 15th run
give money for the 16th run
20000 for the 30th run
give money for the 31st run
10000
from level 1
to level 5
30000
from level 6
to level 15
22500
from level 16 to level 30
15000
after level 31, 7500
running for 30 times, a total of money
60W
level 60
from level 1
to level 5
35000
from level 6
to level 15
26500
from level 16 to level 30
17500
after level 31
8500
give money for 30 runs
70W
grade 70
give money for the first run
40000 for the fifth run
give money for the sixth run
30000 for the 15th run
give money for the 16th run
20000 for the 30th run
give money for the 31st run
10000
9. Many wechat platforms are promoting this blockchain, because people receive money to advertise for them.
10. Digital training Shenzhen enterprises are pioneers
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