BTC has been removed or double flower
Publish: 2021-04-22 13:47:27
1. After the ZF policy, the domestic bitcoin exchanges were basically closed on October 31. Therefore, if bitcoin wants to be realized, it can only be traded on the OTC exchanges of bitcoin abroad. Many of these closed platforms have opened OTC exchanges abroad, but I don't use much. I only use the coinbee platform and sell a few coins. This is how his OTC trades, The basic routines are the same. First you have to register your account, then get your wallet address from the coinbee platform, then recharge the bitcoin into it, choose to publish advertisements, choose the quantity, price, acceptable transfer method, such as Alipay or bank transfer, if someone wants to buy your currency, he will Send a transaction request to you. Then you trust bitcoin, wait for him to call you, and click on the platform to complete the payment. After you confirm that you have received the payment, you can click release bitcoin on the platform to complete the transaction. This is my actual operation. There will be risks. Be careful. This is my personal practice, and I hope it will be useful to the subject.
2. Bitcoin itself can be divided infinitely, but different websites have different minimum withdrawal consumption
at present, bitcoin China, fire coin, coin deposit, China bitcoin and other domestic well-known websites all adopt the lowest number of 0.0001. This should also be considered a standard.
at present, bitcoin China, fire coin, coin deposit, China bitcoin and other domestic well-known websites all adopt the lowest number of 0.0001. This should also be considered a standard.
3.
First, "private transactions" (private transactions between the withdrawer and others (people who need bitcoin) can realize their own bitcoin
Second, the withdrawer is a registered user of a bitcoin wallet. The registered user can operate in the background of bitcoin, and the wallet platform provides security guarantee. The coin bag is of a similar nature
thirdly, registered users can enter the background of the trading platform to carry out cash withdrawal operation, and the security guarantee of cash withdrawal is provided by the platform itself
Fourth, the withdrawal of bitcoin itself is converted into RMB. After the registration of the registration trading platform (bitcoin China), there will be an IP address, and then you can send your own bitcoin to this website
Fifthly, after completing the above operation (wait for 10 minutes, or shorter), bitcoin will be displayed on your account, and then you can sell it at the platform price, so that you can exchange it into RMB4. In the process of learning blockchain, you will hear the word "double flower", which means double payment, or more directly, a sum of money has been spent twice. In this article, we will briefly analyze why there are double flowers and how bitcoin can avoid double flowers
in the traditional transaction, there is no double spending problem because there is a centralized institution such as a bank: every payment will be dected from your bank account, and all details will be recorded in the bank. But in bitcoin, because there is no concept of account, utxo is introced, that is, no transaction output is spent. Because there is no guarantee from centralized institutions such as banks, when a transaction occurs, there may be a risk of double spending: for example, a has a bitcoin, and then he constructs two transactions T1 and T2 at the same time to spend the bitcoin, one of which is given to B, to buy a suit from B, one is given to C, and to buy a pair of shoes from C. If we do not introce some mechanism to avoid this situation, bitcoin, as a digital currency, will not have any meaning of existence. Next, let's analyze how bitcoin can prevent this "double flower" attack
(1) normal situation
first of all, let's look at the normal situation. To put it bluntly, most of the time, the consensus mechanism of blockchain can nip Shuanghua in the bud. Let's illustrate with the above examples:
suppose that a constructs two transactions T1 and T2, and transfers its own value of 1btc utxo to B and C respectively, in an attempt to obtain benefits from B and C at the same time. Then a broadcasts the two constructed transactions to the network almost at the same time
suppose that the miner node in the network receives the transaction T1 first, and finds that the source of funds for the transaction has not been spent, so it adds T1 to its own memory transaction pool and waits to be packaged into the block
in most cases, the miner node will receive transaction T2 soon. At this time, the miner node will refuse to process the transaction because the transaction input that T2 points to is the same as T1 that has been added to the transaction pool. Other miner nodes in the network are similar, so a's attempt to double flower is stillborn
(2) bifurcation
the above is normal, but there are also abnormal cases to consider: suppose that the miner nodes M1 and M2 dig out the block almost at the same time, and unfortunately M1 only receives transaction T1 when digging in the block, while M2 only receives transaction T2 when digging in the block, so transaction T1 and T2 are packed into two blocks respectively. Because these two blocks were g out at about the same time, resulting in the bifurcation of the blockchain:
some nodes in the network (which may be close to M1) received the block blk1 packed by M1 first, so they used the block to extend their own blockchain, while other nodes (which are close to M2) received the block blk2 packed by M2 first, and used the block to extend their own blockchain, So the whole blockchain network
in the traditional transaction, there is no double spending problem because there is a centralized institution such as a bank: every payment will be dected from your bank account, and all details will be recorded in the bank. But in bitcoin, because there is no concept of account, utxo is introced, that is, no transaction output is spent. Because there is no guarantee from centralized institutions such as banks, when a transaction occurs, there may be a risk of double spending: for example, a has a bitcoin, and then he constructs two transactions T1 and T2 at the same time to spend the bitcoin, one of which is given to B, to buy a suit from B, one is given to C, and to buy a pair of shoes from C. If we do not introce some mechanism to avoid this situation, bitcoin, as a digital currency, will not have any meaning of existence. Next, let's analyze how bitcoin can prevent this "double flower" attack
(1) normal situation
first of all, let's look at the normal situation. To put it bluntly, most of the time, the consensus mechanism of blockchain can nip Shuanghua in the bud. Let's illustrate with the above examples:
suppose that a constructs two transactions T1 and T2, and transfers its own value of 1btc utxo to B and C respectively, in an attempt to obtain benefits from B and C at the same time. Then a broadcasts the two constructed transactions to the network almost at the same time
suppose that the miner node in the network receives the transaction T1 first, and finds that the source of funds for the transaction has not been spent, so it adds T1 to its own memory transaction pool and waits to be packaged into the block
in most cases, the miner node will receive transaction T2 soon. At this time, the miner node will refuse to process the transaction because the transaction input that T2 points to is the same as T1 that has been added to the transaction pool. Other miner nodes in the network are similar, so a's attempt to double flower is stillborn
(2) bifurcation
the above is normal, but there are also abnormal cases to consider: suppose that the miner nodes M1 and M2 dig out the block almost at the same time, and unfortunately M1 only receives transaction T1 when digging in the block, while M2 only receives transaction T2 when digging in the block, so transaction T1 and T2 are packed into two blocks respectively. Because these two blocks were g out at about the same time, resulting in the bifurcation of the blockchain:
some nodes in the network (which may be close to M1) received the block blk1 packed by M1 first, so they used the block to extend their own blockchain, while other nodes (which are close to M2) received the block blk2 packed by M2 first, and used the block to extend their own blockchain, So the whole blockchain network
5. Activity line is a comprehensive activity platform, and blockchain is just a small part of it. If you want to query some blockchain activities, it is recommended to go to some blockchain media platforms. For example, chain finance and top finance, but I prefer to use Babbitt's chain node activities. In contrast, their family has more free activities, and the conference quality is also good
by the way, it is not recommended to participate in the blockchain conference where you are always airdropped. What you are interested in is someone else's airdrop, and what they are interested in is your principal. If you are interested in the blockchain instry, you can participate in some technical and instrial meetings, at least to let you know the development of the blockchain instry and the future development of the instry. It is meaningful to attend the meeting.
by the way, it is not recommended to participate in the blockchain conference where you are always airdropped. What you are interested in is someone else's airdrop, and what they are interested in is your principal. If you are interested in the blockchain instry, you can participate in some technical and instrial meetings, at least to let you know the development of the blockchain instry and the future development of the instry. It is meaningful to attend the meeting.
6. Btc360.one, DAIM currency. It's all the routine of the fraud platform. Don't be fooled, people. chenvvv666
7. First of all, the development of VR instry is in the direction of "content" in recent years, but it is obvious that the market potential is insufficient, and it is not particularly practical. So some enterprises have begun to do VR panoramic, but many VR panoramic still stay in 720 display, can't do interaction in panoramic scene
at present, one of the shortcomings of the development of blockchain technology is that it is difficult to apply it to real life, but the token economy model of blockchain is considered to be applicable to all kinds of traditional instries
therefore, if the two technologies are combined, it is a combination of learning from each other. Moreover, such a "VR panoramic blockchain" system has begun to appear in the instry, so the relevant landing application value should also be known in the future
expansion: AI + blockchain is still a popular technology related to blockchain, but it has not been applied in a large area.
at present, one of the shortcomings of the development of blockchain technology is that it is difficult to apply it to real life, but the token economy model of blockchain is considered to be applicable to all kinds of traditional instries
therefore, if the two technologies are combined, it is a combination of learning from each other. Moreover, such a "VR panoramic blockchain" system has begun to appear in the instry, so the relevant landing application value should also be known in the future
expansion: AI + blockchain is still a popular technology related to blockchain, but it has not been applied in a large area.
8. This is a black platform. I couldn't take out the money I put in. I also invested 680000 yuan. Later, I found that I couldn't take it out. I found that I was cheated and found someone in time to get the money back.
9. If you trust the trading platform and don't want to withdraw bitcoin, you can directly store it on the platform, and you don't need a bitcoin wallet. The top few domestic trading platforms are basically trustworthy. After all, GBL, the only one on the run, has been caught.
10. Yes, it can be converted to the world platform, which is specially acquired by someone
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