Is there a bitcoin wallet in China

1. bitcoin was born in a paper in 2008
a person signed by Nakamoto Tsui has put forward a revolutionary idea: let's create a currency that is not controlled by the government or anyone else! This idea is crazy: there is no asset support behind a string of figures, and no one is responsible for it. How can anyone accept it when you pay it to the other party as money
Merkle tree
looks like a binary tree, but this is the lower two nodes. Take the hash value to get the upper node. Just remember the root node to detect whether the whole tree has been tampered
the root hash value is stored in the block header, and the transaction process is stored in the block body. All nodes include block header and block body, but light nodes (such as bitcoin wallets on mobile phones) only include block header. This tree can prove that a transaction has been written into the blockchain
3. Consensus agreement
two issues should be paid attention to in decentralized currency:
1. Who can issue digital currency: mining
2. How to verify the legitimacy of transactions: blockchain
double spending attack
double spending attack is a major challenge of digital currency
all transactions in bitcoin have input and output. Where does bitcoin come from and where does it go
under normal circumstances, there may be two bifurcations, because two nodes obtain the bookkeeping right at the same time, and the two nodes package the block and calculate the random number at the same time. At this time, the two bifurcations will coexist temporarily until one of the blocks finds the next block first, which becomes the longest legal chain, and the other one is discarded<

Sybil attack
a malicious node keeps generating accounts. If the total number of accounts exceeds half of the total accounts, it obtains the control of the blockchain

consensus protocol in bitcoin
some nodes are malicious, and most nodes are good

idea 1: pack some transactions into blocks as candidate blocks, let each block vote, and write them into the blockchain if they pass

No, because some malicious nodes have been publishing blocks containing malicious transactions, and they have been voting and occupying resources. And some nodes don't vote<

idea 2: vote not by the number of accounts, but by computing power. Each node can generate legal transactions and put them into the block. These nodes start to try random numbers until H (block header) ≤ target is found, then this node has the right to account

the only way to generate bitcoin
coinbase transaction. There is no need to point out the source of the currency. If you have the bookkeeping right, you will get a reward< br />
50BTC-> 25BTC-> 12.5btc, the reward will be halved for every 210000 bitcoins

the process of bitcoin competing for bookkeeping rights is called mining. The node competing for bookkeeping right is called miner.

2. There are many bitcoin wallets. The operation of bitcoin wallets is relatively simple, the data is secure, and they can arrive at the account quickly. No matter how much you say, you still need to feel deeply. You can just register and try.

3. Fire coin is an exchange, and the procts related to fire coin are not bitcoin wallets in the original sense (even if fire coin names the proct XX wallet, it is still not bitcoin wallets). In fact, it's just the difference between onchain and offchain. The real bitcoin wallet can generate its own private key (address). Where the private key is kept by others is not a bitcoin wallet.

4. There are three types of bitcoin wallets: bitcoin client wallets, bitcoin web wallets, bitcoin mobile phones and pad wallets

5. There are a lot of bitcoin wallets. The operation of PayPal is relatively simple, the data is safe, and it can arrive at the account quickly. No matter how much you say, you still need to feel deeply. You can just register and try.

6. This varies from person to person. It depends on the entrepreneur's own choice. The application scenarios of blockchain are very wide
for example, European crowdfunding chooses to use blockchain technology to serve the real economy and crowdfunding through blockchain technology. Ethereum launched an intelligent contract system; Decent uses blockchain technology to protect intellectual property rights.

7. First of all, you should imagine a concept of "wallet" in your brain. Your bitcoin is in your wallet. A wallet can contain many... Many addresses. As long as the address is generated by your client and other people pay to the address, they will remit money to the wallet. Where is your wallet? If you are using the Windows client, please click the start menu, find "run", and then enter% appdata% &; Bitcoin click "OK" and you will find a file called wallet.dat, which is your "wallet". The wallet stores all the keys used to prove that you have the money contained in the wallet. You need to do two aspects of work at the same time: 1. Ensure that the wallet will not be lost; 2. Ensure that the wallet will not be obtained by others. The method is: encrypt the backup. Relatively simple and effective one is: 0, install anti-virus software, thoroughly kill a virus, keep anti-virus software running 1, close bitcoin client 2, use winrar encryption compression. Please remember to use the password with enough security, and the password should not be retarded. Then back up the encrypted file to a secure U disk. 3. Delete the wallet.dat in disk C. when you need to pay bitcoin, 4. Is it troublesome to decompress the backup wallet.dat into the folder mentioned above? Yes, it's so troublesome, because bitcoin currency system is still at an extremely early stage. It's invented and accepted by some technology enthusiasts, and they haven't had time to take care of the feelings of ordinary users. All of this will become easier to use in the future. However, the next version of bitcoin client is ready to build in the integrated wallet encryption function, which will be much easier for ordinary users to back up. As long as you make sure that your computer has no Trojan horse and set a strong enough password, it is largely safe. Gavin also plans to introce a two device authentication mechanism, that is, to divide your wallet into two parts that are encrypted and protected, one part in your computer, and the other part in other devices, such as mobile phones. Just like the SMS verification launched by some online banks, to complete the payment, two devices need to confirm at the same time. This is not troublesome for the actual owner of bitcoin, but for the thieves, they need to steal the files of two devices at the same time to steal the key. In addition to the acquaintances around you (you must also know your password), that is basically an impossible task. It is expected that there will be reliable bitcoin online storage in the future, and even traditional banks may launch bitcoin escrow service, which will be much more convenient at that time

8. Many wallets can hold bitcoin
bitpai is still used by many people, and it can store many other mainstream digital currencies.

9. The choice depends on the strength and background of the platform. Taking the coin pack as an example, the operation is simple, the cash withdrawal is super fast, and there is no handling charge