Bank of England confirms bitcoin
Publish: 2021-04-23 22:33:49
1. In order to understand the technical principle of bitcoin, we need to understand two important cryptographic techniques: hash code: it converts a long string into a fixed length string, and its conversion is irreversible, that is, it is impossible to guess the original string from hash code. Sha256 is mainly used in bitcoin protocol
public key system: corresponds to a public key and a private key, keeps the private key in the application and publishes the public key. When Party A transmits information to Party B, it can use Party A's private key to encrypt the information, and Party B can use Party A's public key to decrypt the information, so as to ensure that the third party cannot impersonate Party A to send the information; At the same time, when Party A transmits information to Party B, it is encrypted with Party B's public key and sent to Party B, and then Party B decrypts it with his own private key, so as to ensure that the third party cannot eavesdrop on the communication between the two people. RSA is the most common public key system, but the lliptic curve digital signature algorithm is used in bitcoin protocol. What's the difference between cash and bank account? Bitcoin is an electronic currency in BTC. In this article, it is also used to refer to the whole bitcoin system. Like opening an account in a bank, the corresponding concept in bitcoin is address. Everyone can have one or more bitcoin addresses, which are used to pay and collect money. Each address is a string that starts with 1. For example, I have two bitcoin accounts, and. A bitcoin account is uniquely determined by a pair of public key and private key. To save the account, you only need to save the private key file. Unlike bank accounts, banks keep all transaction records and maintain the book balance of each account, while bitcoin's transaction records are jointly maintained by the whole P2P network through a pre agreed protocol. How much money is in my account address? Although the current account balance can be seen by bitcoin software, unlike banks, there is no place to maintain the book balance of each address. It can only calculate the account balance in real time through all historical transactions. How do I pay? When I pay from address a to address B of the other party, the payment amount is e. at this time, both parties will announce the transaction information to each network node, telling address a to pay to address B, and the payment amount is e. In order to prevent the third party from forging the transaction information, the transaction information will be encrypted with the private key of address A. at this time, the network node receiving the transaction information can use the public key of address a to verify that the transaction information is indeed sent by address a. Of course, trading software will help us do these things, we just need to input the relevant parameters in the software. What will the network node do after receiving the transaction information? This is the most important part of the bitcoin system, which needs to be elaborated. For the sake of simplicity, only bitcoin protocol has been implemented. In the current version, each network node will save all transaction information synchronously. There are two kinds of transaction information in history, one is & quot; Verified & quot; The transaction information, that is, the verified transaction information, is stored in a series of "blocks". Each & quot; block" Is the previous & quot; bock" The ID of each block is the hash code of the hash code of the block and the new transaction information (see an actual block). The other category refers to those who also & quot; Unverified & quot; The transaction information just paid above belongs to this category. When a network node receives new unverified transaction information (possibly more than one), it can calculate the book balance of each address at that time because the node keeps all the transaction information in history, so it can calculate whether the transaction information is valid, that is, whether there is enough balance in the payment account. After eliminating the invalid transaction information, it first takes out the last & quot; block" Then, the unverified transaction information is combined with the ID, and a verification code is added to form a new "block". It needs a lot of calculation to build a new block, because it needs to calculate the verification code, so that the above combination becomes a block, that is, the first several bits of the hash code of the block are 1. At present, the first 13 bits need to be 1 (generally, the specific method is uncertain), which means that if the block is generated by enumeration method, the average number of enumerations is 16 ^ 13. Using CPU resources to generate a block is called "gold mining", because the proction of the block will get a certain reward, and the reward information has been included in the block. When a network node generates a new block, it will broadcast to other network nodes. However, this network block may not be accepted by the network, because it is possible that other network nodes have proced the block earlier. Only the earliest block or the block with the largest number of subsequent blocks is valid, and the remaining blocks are no longer used as the initial blocks of the next block. How does the other party confirm that the payment is successful? When the payment information is distributed to the network node, the network node begins to calculate whether the transaction is valid (that is, whether the account balance is enough to pay), and attempts to generate blocks containing the transaction information. When six blocks (one direct block and five subsequent blocks) contain the transaction information, the transaction information is considered "verified", so that the transaction is formally confirmed, and the other party can confirm the successful payment. A possible problem is that I will pay the balance of address a to address B, and at the same time pay to address C. If I only verify that the single comparison transaction is valid. At this point, my way of cheating is to generate six blocks including B to B and six blocks including C to C before the truth is revealed. Because I need a very long CPU time to generate a block, compared with the whole network, the probability of my cheating success is very small. What is the motivation of network nodes to proce blocks? As can be seen from the above description, in order to make the transaction information effective, the network node needs to generate 1 and 5 subsequent blocks to contain the transaction information, and such block generation is very CPU intensive. How to let other network nodes help to proce blocks as soon as possible? The answer is very simple. The agreement stipulates that BTC will be rewarded for the address where the block is proced, as well as the Commission promised by both parties. At present, the reward for procing a block is 50btc, which will be halved every four years in the future. For example, the reward will be 25btc from 2013 to 2016. Is the transaction anonymous? Yes, and No. All bitcoin transactions are visible. We can check all transaction records of each account, such as mine. But what's different from the banking monetary system is that everyone's account itself is anonymous, and everyone can open many accounts. In general, anonymity is not as good as it claims. But bitcoin has another advantage in doing black market trading: it can't be frozen. Even if the police trace a bitcoin address, there is nothing they can do unless they trace the computer used by the exchange based on the Internet address. How to ensure that bitcoin does not depreciate? Generally speaking, in the case of equivalent trading activities, the value of money is inversely proportional to the amount of money issued. Unlike the traditional money market, the central bank can determine the amount of money issued. Bitcoin does not have a central issuing institution. Only by procing blocks can we get a certain amount of BTC currency. Therefore, bitcoin's new amount of money depends on: 1. The speed of procing blocks: bitcoin's agreement stipulates that the difficulty of procing blocks is fixed at an average of 2016 every two weeks, about 10 minutes. Moore's law of doubling CPU speed every 18 months will not speed up the proction of block. 2. The number of rewards for block proction: at present, 50 BTC is awarded for each block proced, which is halved every four years. In 2013, 25 BTC is awarded, and in 2017, 12.5 BTC is awarded. Considering the above two factors, bitcoin's currency issuing speed is not controlled by any single node in the network. Its protocol makes the currency stock known in advance, and the maximum stock is only 21 million BTC
public key system: corresponds to a public key and a private key, keeps the private key in the application and publishes the public key. When Party A transmits information to Party B, it can use Party A's private key to encrypt the information, and Party B can use Party A's public key to decrypt the information, so as to ensure that the third party cannot impersonate Party A to send the information; At the same time, when Party A transmits information to Party B, it is encrypted with Party B's public key and sent to Party B, and then Party B decrypts it with his own private key, so as to ensure that the third party cannot eavesdrop on the communication between the two people. RSA is the most common public key system, but the lliptic curve digital signature algorithm is used in bitcoin protocol. What's the difference between cash and bank account? Bitcoin is an electronic currency in BTC. In this article, it is also used to refer to the whole bitcoin system. Like opening an account in a bank, the corresponding concept in bitcoin is address. Everyone can have one or more bitcoin addresses, which are used to pay and collect money. Each address is a string that starts with 1. For example, I have two bitcoin accounts, and. A bitcoin account is uniquely determined by a pair of public key and private key. To save the account, you only need to save the private key file. Unlike bank accounts, banks keep all transaction records and maintain the book balance of each account, while bitcoin's transaction records are jointly maintained by the whole P2P network through a pre agreed protocol. How much money is in my account address? Although the current account balance can be seen by bitcoin software, unlike banks, there is no place to maintain the book balance of each address. It can only calculate the account balance in real time through all historical transactions. How do I pay? When I pay from address a to address B of the other party, the payment amount is e. at this time, both parties will announce the transaction information to each network node, telling address a to pay to address B, and the payment amount is e. In order to prevent the third party from forging the transaction information, the transaction information will be encrypted with the private key of address A. at this time, the network node receiving the transaction information can use the public key of address a to verify that the transaction information is indeed sent by address a. Of course, trading software will help us do these things, we just need to input the relevant parameters in the software. What will the network node do after receiving the transaction information? This is the most important part of the bitcoin system, which needs to be elaborated. For the sake of simplicity, only bitcoin protocol has been implemented. In the current version, each network node will save all transaction information synchronously. There are two kinds of transaction information in history, one is & quot; Verified & quot; The transaction information, that is, the verified transaction information, is stored in a series of "blocks". Each & quot; block" Is the previous & quot; bock" The ID of each block is the hash code of the hash code of the block and the new transaction information (see an actual block). The other category refers to those who also & quot; Unverified & quot; The transaction information just paid above belongs to this category. When a network node receives new unverified transaction information (possibly more than one), it can calculate the book balance of each address at that time because the node keeps all the transaction information in history, so it can calculate whether the transaction information is valid, that is, whether there is enough balance in the payment account. After eliminating the invalid transaction information, it first takes out the last & quot; block" Then, the unverified transaction information is combined with the ID, and a verification code is added to form a new "block". It needs a lot of calculation to build a new block, because it needs to calculate the verification code, so that the above combination becomes a block, that is, the first several bits of the hash code of the block are 1. At present, the first 13 bits need to be 1 (generally, the specific method is uncertain), which means that if the block is generated by enumeration method, the average number of enumerations is 16 ^ 13. Using CPU resources to generate a block is called "gold mining", because the proction of the block will get a certain reward, and the reward information has been included in the block. When a network node generates a new block, it will broadcast to other network nodes. However, this network block may not be accepted by the network, because it is possible that other network nodes have proced the block earlier. Only the earliest block or the block with the largest number of subsequent blocks is valid, and the remaining blocks are no longer used as the initial blocks of the next block. How does the other party confirm that the payment is successful? When the payment information is distributed to the network node, the network node begins to calculate whether the transaction is valid (that is, whether the account balance is enough to pay), and attempts to generate blocks containing the transaction information. When six blocks (one direct block and five subsequent blocks) contain the transaction information, the transaction information is considered "verified", so that the transaction is formally confirmed, and the other party can confirm the successful payment. A possible problem is that I will pay the balance of address a to address B, and at the same time pay to address C. If I only verify that the single comparison transaction is valid. At this point, my way of cheating is to generate six blocks including B to B and six blocks including C to C before the truth is revealed. Because I need a very long CPU time to generate a block, compared with the whole network, the probability of my cheating success is very small. What is the motivation of network nodes to proce blocks? As can be seen from the above description, in order to make the transaction information effective, the network node needs to generate 1 and 5 subsequent blocks to contain the transaction information, and such block generation is very CPU intensive. How to let other network nodes help to proce blocks as soon as possible? The answer is very simple. The agreement stipulates that BTC will be rewarded for the address where the block is proced, as well as the Commission promised by both parties. At present, the reward for procing a block is 50btc, which will be halved every four years in the future. For example, the reward will be 25btc from 2013 to 2016. Is the transaction anonymous? Yes, and No. All bitcoin transactions are visible. We can check all transaction records of each account, such as mine. But what's different from the banking monetary system is that everyone's account itself is anonymous, and everyone can open many accounts. In general, anonymity is not as good as it claims. But bitcoin has another advantage in doing black market trading: it can't be frozen. Even if the police trace a bitcoin address, there is nothing they can do unless they trace the computer used by the exchange based on the Internet address. How to ensure that bitcoin does not depreciate? Generally speaking, in the case of equivalent trading activities, the value of money is inversely proportional to the amount of money issued. Unlike the traditional money market, the central bank can determine the amount of money issued. Bitcoin does not have a central issuing institution. Only by procing blocks can we get a certain amount of BTC currency. Therefore, bitcoin's new amount of money depends on: 1. The speed of procing blocks: bitcoin's agreement stipulates that the difficulty of procing blocks is fixed at an average of 2016 every two weeks, about 10 minutes. Moore's law of doubling CPU speed every 18 months will not speed up the proction of block. 2. The number of rewards for block proction: at present, 50 BTC is awarded for each block proced, which is halved every four years. In 2013, 25 BTC is awarded, and in 2017, 12.5 BTC is awarded. Considering the above two factors, bitcoin's currency issuing speed is not controlled by any single node in the network. Its protocol makes the currency stock known in advance, and the maximum stock is only 21 million BTC
2. Bitcoin is a kind of digital code in the form of P2P. Bitcoin is not issued by specific currency institutions, it is generated by a large number of calculations based on specific algorithms. Bitcoin economy uses a distributed database composed of many nodes in the whole P2P network to confirm and record all transactions. The decentralized nature and algorithm of P2P can ensure that it is impossible to artificially manipulate the value of bitcoin through mass proction
bitcoin lacks stability, so it doesn't have "inherent value", it's just a virtual proct. If we recognize its legitimacy, it will have a significant adverse impact on the banks of all countries, and even can replace the currencies of all countries. Finally, a few people will manipulate the world's monetary system, which is a very dangerous existence. It's not money. Whether it's legal or not depends entirely on whether a country recognizes it as legal or not< At present, the United States, China and South Korea all think it is not a currency. Among the big countries, bitcoin is only recognized as the "unit of account" by the German Ministry of finance, but it is only a unit of account, which does not mean that it is mainly a currency.
bitcoin lacks stability, so it doesn't have "inherent value", it's just a virtual proct. If we recognize its legitimacy, it will have a significant adverse impact on the banks of all countries, and even can replace the currencies of all countries. Finally, a few people will manipulate the world's monetary system, which is a very dangerous existence. It's not money. Whether it's legal or not depends entirely on whether a country recognizes it as legal or not< At present, the United States, China and South Korea all think it is not a currency. Among the big countries, bitcoin is only recognized as the "unit of account" by the German Ministry of finance, but it is only a unit of account, which does not mean that it is mainly a currency.
3. Australia
in October 2013, bitcoin Bank of Australia was attacked by hackers, with a loss value of more than US $1 million. This incident has aroused the concern of bitcoin security in Australia. The Reserve Bank of Australia and the Australian tax office have said they want a virtual currency tax like a business transfer tax
Bangladesh
the Central Bank of Bangladesh banned the use of virtual currency in September 2014. Using bitcoin will be punished by law
Brazil
Brazil is one of the few countries in the world that has enacted laws related to electronic currency payment systems. Brazil has not banned bitcoin
Bolivia
for regulatory reasons, the Central Bank of Bolivia (BCB) has banned the use of bitcoin. BCB believes cryptocurrency will help business entities evade taxes
Canada
bitcoin is not considered legal, that is, bitcoin is not recognized by Canadian law. Canada's tax authorities plan to implement the same tax plan as barter trade and speculative trading for the bitcoin
China
China is one of the few countries in the world that ban bitcoin completely and prohibit financial institutions and banks from dealing with bitcoin transactions. In December 2013, the people's Bank of China issued a notice calling bitcoin & quot; Virtual goods;, And prevent it from becoming money
trading has been suspended
Ecuador has banned bitcoin, but it has chosen to set up a new state-owned electronic currency and monetary system, and the currency will be protected by the assets of the Central Bank of Ecuador
EU
at present, the EU still has different views on the classification of bitcoin. In October 2012, the European Central Bank's report on virtual currency concerns the legality of bitcoin under the EU legal framework. The European Banking Regulatory Authority issued a bitcoin risk warning, saying that the use of bitcoin has not been restricted at present
Finland
Finland has relevant regulations for the use of virtual currencies such as bitcoin. The relevant regulations are issued by the Finnish tax authority Vero skatt. Any gains arising from bitcoin transactions will be subject to capital gains tax
Hong Kong
Hong Kong has no regulations for bitcoin or any other virtual currency. However, the government is closely monitoring the use of bitcoin to prohibit money laundering, fraud and other illegal activities
India
India does not explicitly stipulate or prohibit the use of bitcoin. However, the Reserve Bank of India (RBI), equivalent to the Central Bank of India, has been forced to shut down India's largest bitcoin trading platform after it issued a notice that the use of bitcoin could cause money laundering and security problems
Israel
the Israeli tax authority is considering levying income tax on bitcoin transactions. Israeli banks even blackmail bitcoin payments
Kyrgyz
Kyrgyz central bank has banned the use of digital currency and bitcoin for the reasons of lack of centralized management, high currency risk and legal problems
Russia
the Central Bank of Russia believes that bitcoin may be used for money laundering and terrorist financing. Therefore, the Russian government banned the use of bitcoin
Taiwan
Taiwan's financial supervision commission is concerned about the uncertainty and speculation of bitcoin, so Taiwan opposes the installation of bitcoin ATM
UK
at present, there are no relevant regulations for the bitcoin. Profits or losses from bitcoin transactions are subject to capital gains tax, while the purchase of bitcoin is still subject to VAT
the U.S.
the U.S. is probably the most supportive country for virtual currencies such as bitcoin. There are no final rules on bitcoin. However, there are also many new rules for the establishment of bitcoin management framework.
in October 2013, bitcoin Bank of Australia was attacked by hackers, with a loss value of more than US $1 million. This incident has aroused the concern of bitcoin security in Australia. The Reserve Bank of Australia and the Australian tax office have said they want a virtual currency tax like a business transfer tax
Bangladesh
the Central Bank of Bangladesh banned the use of virtual currency in September 2014. Using bitcoin will be punished by law
Brazil
Brazil is one of the few countries in the world that has enacted laws related to electronic currency payment systems. Brazil has not banned bitcoin
Bolivia
for regulatory reasons, the Central Bank of Bolivia (BCB) has banned the use of bitcoin. BCB believes cryptocurrency will help business entities evade taxes
Canada
bitcoin is not considered legal, that is, bitcoin is not recognized by Canadian law. Canada's tax authorities plan to implement the same tax plan as barter trade and speculative trading for the bitcoin
China
China is one of the few countries in the world that ban bitcoin completely and prohibit financial institutions and banks from dealing with bitcoin transactions. In December 2013, the people's Bank of China issued a notice calling bitcoin & quot; Virtual goods;, And prevent it from becoming money
trading has been suspended
Ecuador has banned bitcoin, but it has chosen to set up a new state-owned electronic currency and monetary system, and the currency will be protected by the assets of the Central Bank of Ecuador
EU
at present, the EU still has different views on the classification of bitcoin. In October 2012, the European Central Bank's report on virtual currency concerns the legality of bitcoin under the EU legal framework. The European Banking Regulatory Authority issued a bitcoin risk warning, saying that the use of bitcoin has not been restricted at present
Finland
Finland has relevant regulations for the use of virtual currencies such as bitcoin. The relevant regulations are issued by the Finnish tax authority Vero skatt. Any gains arising from bitcoin transactions will be subject to capital gains tax
Hong Kong
Hong Kong has no regulations for bitcoin or any other virtual currency. However, the government is closely monitoring the use of bitcoin to prohibit money laundering, fraud and other illegal activities
India
India does not explicitly stipulate or prohibit the use of bitcoin. However, the Reserve Bank of India (RBI), equivalent to the Central Bank of India, has been forced to shut down India's largest bitcoin trading platform after it issued a notice that the use of bitcoin could cause money laundering and security problems
Israel
the Israeli tax authority is considering levying income tax on bitcoin transactions. Israeli banks even blackmail bitcoin payments
Kyrgyz
Kyrgyz central bank has banned the use of digital currency and bitcoin for the reasons of lack of centralized management, high currency risk and legal problems
Russia
the Central Bank of Russia believes that bitcoin may be used for money laundering and terrorist financing. Therefore, the Russian government banned the use of bitcoin
Taiwan
Taiwan's financial supervision commission is concerned about the uncertainty and speculation of bitcoin, so Taiwan opposes the installation of bitcoin ATM
UK
at present, there are no relevant regulations for the bitcoin. Profits or losses from bitcoin transactions are subject to capital gains tax, while the purchase of bitcoin is still subject to VAT
the U.S.
the U.S. is probably the most supportive country for virtual currencies such as bitcoin. There are no final rules on bitcoin. However, there are also many new rules for the establishment of bitcoin management framework.
4.
From the north entrance of Jingning Road, take bus No.144, after 11 stops, to the geological Hotel station
5.
Enter the Tencent QQ anti fraud center, you can search the "Tencent report Acceptance Center" on the browser to enter the official website, or you can enter the website directly
the specific steps are as follows:
1. After entering the website, you will receive a responsibility agreement. Check the agreement below and click I want to report below< br />
6. If it's through a large online trading website such as Taobao and eBay, go to complain, and complain on the website. All the stores open on this online trading platform have identity authentication, and they will generally fight to the end. If it's a personal website, it's self admission of bad luck... Don't believe it in the future... It seems that there are complaints about online fraud on the Internet. Find... Lord, bless you
7.
in the future, bitcoin may be more used as an investment asset than a trading currency bitcoin can be said to be the most active cryptocurrency in this period of time. At the recent Boao Forum, officials of the central bank gave a new explanation for cryptocurrency of bitcoin. The central bank said that although bitcoin is defined as currency, it is actually a rare investment asset. In the future, more and more people may use bitcoin as an investment asset. However, bitcoin is still limited in the scope of actual transactions, whether online or offline, There are not many trading scenarios for bitcoin
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