Bitcoin full node synchronization

1. The essence of bitcoin is an account book, which keeps all the transaction records of history. Bitcoin client is responsible for interacting with other clients in the form of P2P, so it is also called P2P node. If the client has downloaded all the ledgers, the node is the full node.

2. The reason why blockchain ledger can be decentralized is that all nodes of the network synchronize the ledger with each other and keep consistent. Therefore, blockchain does not need a centralized bookkeeping institution, so what is the node
bitcoin is a kind of point-to-point e-cash system, more directly, node to node. Each transaction is broadcast by the originator to the nodes around it, and then broadcast to the nodes around it after receiving it, and finally spread to the whole network
every bitcoin wallet is a node, and the node with a complete blockchain ledger is called the whole node. In October 2017, there were about 9300 nodes in the bitcoin network, which were responsible for broadcasting and verifying bitcoin transfer transactions. After the transfer transaction occurs, all nodes broadcast to the whole network. After the mining node verifies that the transaction is correct, it will be recorded in the blockchain ledger. The United States, Germany and France have the largest number of bitcoin nodes, with China accounting for about 5% of the world's total nodes Data source: bitcodes. 21. CO) running bitcoin node does not provide any reward, and it does not need the whole node to transfer bitcoin, so the total number of bitcoin nodes only accounts for a small part of the node number.

3. Bitcoin blockchain is a bitcoin blockchain? No, the block stores the transaction. In the early stage, you will get a coin if you successfully build a block. In the later stage, you can only get the fees paid by the exchange. A currency is a string of digital signatures. It is a digital signature sent by the last owner to the receiver. Everyone can see who owns the currency from the transaction
does each node have complete blockchain data? You mean a user node? A user node needs to keep the of the block head of the longest workload proof chain, so it knows the data of all the block heads. It can move forward to know all the data on the block chain, but not all of them are saved. A block header is very small, only 80 bytes, which can be saved completely, because the generation of nodes is very slow. Even with the passage of time, the amount is not too large now.

4. It's OK. Just take out the wallet file and reload it. If you don't log in bitcoin, you'll get it

5. Take bus NO.48 at Dongfeng overpass or Taixing South Road and get off at decaili. Go ahead to Balitai overpass and turn left. Inside Jingyan building is Balitai new culture square

or you can walk to Jintang Road, take bus no.643 at Hedong stadium and get off at Balitai (Weijin Road). Go ahead and cross the overpass to Jingyan building

6. How to mine every day; Share mining tips every day; When the initial physical strength is tight, when it is close to 20 times, you can leave two small monsters without fighting. For example, when the number of monsters reaches 18, you can leave two small monsters, and then dig long-time gems to save your strength. When the physical strength is close to the upper limit, you can kill the two small monsters and start looking for the big boss. This can avoid that you can't find the big boss if you don't have enough medicine. Because mining is mainly for the soul crystal and the golden man, the little monster will appear in your field of vision, and the little golden man will appear in your field of vision + 1, so the larger the field of vision you open, the greater the chance of the appearance of the little monster and the little golden man. The same physical strength, in order to open a larger field of vision, the following mining method is recommended. First, one line is g to the bottom. At present, the deepest mining area is 302, which can be g to about 270. Then, four lines are opened horizontally, which are A copper tin Ruby line, about 30 deep A line of iron violet, about 65 deep Silver Emerald is a line, and other gem ores are a line at 270 depth It doesn't matter about the left and right sides. You need to dig horizontally and don't dig back. You can adjust up and down if you need minerals or rocks that need explosives. This can ensure the maximum range of vision under the same physical strength. When you need certain resources, you can dig along a certain line. In addition, if the field of vision is large, more pink gemstones such as pink diamonds will be proced, which can improve the mining efficiency. It is suggested that novices can open a miner card after digging to the depth of 270. For nothing else, the efficiency of double line mining can be improved a lot. There is no need to upgrade the types of automatic mining, because it does not improve the efficiency of mining. If there is a shortage of ore, you can buy more miners. You must order titanium Titan steel before going to bed every day. Automatic miners are the same as mining areas. Although they can't be used at present, they can't be used in the later stage. Keep at least 4 or 5 explosives, otherwise sometimes you will cry when you meet the little golden man surrounded by stones.

7.

1. During the first phase of the interstellar war, players only need to place the hang up location in the first and second levels of each map, and they will get a crystal ore as well as props. Because the first and second levels can get props once an hour, So players can get 24 crystal ores in one day, and 24 * 7168 crystal ores in seven days

2. During the activity period, players only need to open any treasure box in the mining area to a certain extent to get the crystal ore reward, which is divided into five grades

3. Electronic competition Wallet: ring the activity period, you can get rewards when you recharge to a certain amount, among which you can get crystal ore bag when you recharge more than 30 yuan, and you can get 100 crystal ore when you open the crystal ore bag

accumulatively support 50 crystal ores to obtain: honor fragment * 1000, detonator * 5, troll statue * 5, mysterious stone * 1

8. Bitcoin wallet has a large amount of data, many areas and dozens of G's. If it's the first synchronization, it's normal.

9. Only full node clients like bitcoin core need longer synchronization time. Technically, synchronization is a process of downloading and verifying all previous bitcoin transactions on the network. Some bitcoin clients need to know all previous transactions to calculate the available balance of your bitcoin wallet and complete new transactions. This step consumes a lot of resources and needs enough bandwidth and space to store the whole block chain. In order to maintain the security of bitcoin, enough users need to use the full node client, because they play the role of confirmation and relay transactions
an error has occurred, which may be e to network disconnection or incompatibility. Just update it. As a matter of fact, the online money and packet technology has developed quite mature now. It's better to put bitcoin in your own computer than in your online wallet. Of course, if you are a technology flow, you can go anywhere.

10. In order to achieve the goal of decentralization, everyone in bitcoin network can keep accounts. But with so many people all over the world recording accounts at the same time, who should listen to
this is the consensus issue of bitcoin. In other words, how to achieve decentralization at the same time, let the nodes of the whole network reach a consensus and keep the consistency of all accounts? This is a problem that the decentralized system could not solve for a long time in the past
Nakamoto Tsung proposed the solution of proof of work. It stipulates that the person who pays the most calculation work has a better chance to obtain the final bookkeeping right. His bookkeeping results will be recognized by the whole network. How to measure the calculation workload? Bookkeepers need to spend computer power to solve a problem called hash function. This problem can only be guessed one by one through computer enumeration. The stronger the calculation power, the easier it is to guess the right answer. Once a lucky bookkeeper finds the answer, he will get the right to keep accounts. And get a bitcoin reward. Everyone should listen to his accounting results and start new records on his basis
to put it simply, more is more. The harder you work, the luckier you are. POW solves the problem of mutual distrust nodes reaching consensus, and is considered to be the ancestor of all consensus mechanisms. It makes bitcoin a truly decentralized autonomous system.