Block chain transaction password

1. Similar to the stock exchange, blockchain exchange is the website platform for digital currency trading. Xrv522 can develop blockchain exchanges. These trading platforms generally only provide functions such as recharge, transfer and cash withdrawal. In other words, they will only tell you the collection address of your wallet, while the key, keysore and mnemonic words of your wallet will not be provided. Identity authentication is completed through login user name, password, verification email, mobile phone and other ways
(1) introction to price limit trading mode:
price limit buying / selling refers to that the user sets the price and quantity of a buying / selling currency to generate an order. The system will automatically match the buying and selling orders in the market. Once the price set by the user is reached, the transaction will be automatically executed according to the price priority time priority
(2) introction to market price transaction mode:
market price purchase refers to that the user sets a total amount and generates a commission order, from the beginning of selling to the completion of the total amount transaction. Selling at market price means that the user sets the total number of currencies to be sold, generates a commission document, and matches it from the beginning of buying to the completion of the total number of currencies transaction
(3) introction to currency transaction mode:
currency transaction is mainly aimed at the transaction between virtual digital assets and virtual digital assets, in which one currency is used as the pricing unit to purchase other currencies, and the currency transaction rule is also to complete matching transaction according to price priority and time priority< (4) introction of C2C transaction mode:
both parties of the transaction release the transaction information of buying or selling currency on the C2C transaction platform according to the demand. The buyer and the seller complete the transaction offline according to the agreed payment method, and the platform, as an intermediary, charges a certain proportion of the handling fee from each successful transaction< (5) introction to OTC OTC trading mode:
it is a set of platform for offline purchase of digital currency independent of the exchange. Businesses can publish purchase / sale advertisements on the platform, and purchase / sale users can purchase / sell through offline transfer. After the transfer, the platform will transfer the frozen digital currency to the buyer, The technical construction problems of the exchange can be found on the Internet
(6) introction to trading mining mode:
the exchange platform returns a certain proportion of the commission income to the platform users, and the platform coin is returned. According to the principle of distribution proportion, the exchange platform takes a certain proportion as the mining reward. Mining refers to trading on the platform to graally unlock the platform coin until all the platform coins are fed back. This kind of play has a strong attraction to attract users< (7) introction to futures / contract trading mode:
futures contract is an agreement that the buyer agrees to receive certain assets at a specific price after a specified period of time, and the Seller agrees to deliver certain assets at a specific price after a specified period of time. The price that both parties agree to use in future trading is called futures price. The designated r period in which both parties have to trade in the future is called the settlement date or delivery date. The assets agreed to be exchanged by both parties are called "subject matter"< (8) introction to the trading mode of perpetual contract:
perpetual contract is a new and unique contract. The goal of the contract is to allow high leverage to the market conditions of the spot market. The contract will not be delivered and can follow the reference price index through various mechanisms. The contract evolved from the traditional futures contract, but the perpetual contract has more obvious advantages and greater risks than the traditional futures contract, supporting long short two-way trading, opening a 100 times leverage, permanent position, premium and so on.

2. If you lose the mnemonic words in the digital currency wallet, it is almost equal to the loss of the private key. Mnemonic words are just a form of the private key that is easier to understand. If you lose the private key, it is almost equal to the loss of the digital currency in the wallet. With the current technology, it is impossible to crack it. Therefore, if you forget it, you can only recognize it. Change the wallet and back up the mnemonic words

3. There are many trading platforms, such as Huo coin and coin an, which are well-known. Information about blockchain can be found in cryptofinance.

4. bitcoin (English: bitcoin, abbreviated as BTC or XBT) is a kind of cryptocurrency based on decentralization, adopting point-to-point network and consensus initiative, open source, and blockchain as the underlying technology. Bitcoin was published by Satoshi Nakamoto on October 31, 2008, and Genesis block was born on January 3, 2009. In some countries, central banks and government agencies, bitcoin is regarded as a virtual commodity rather than a currency

anyone can participate in bitcoin activities, which can be issued through computer computing called mining. The number of bitcoin protocols is capped at 21 million to avoid inflation. Bitcoin is used as a digital signature through the private key, which allows indivials to pay directly to others. It is the same as cash, and does not need to go through third-party institutions such as banks, clearing centers, securities dealers, electronic payment platforms, so as to avoid high fees, cumbersome processes and regulatory problems. Any user can use it as long as he has a digital device that can connect to the Internet

however, e to the limited transaction volume that bitcoin blockchain can accept in a certain period of time, it can accept up to 2500 transactions every 10 minutes, and the transaction handling fee will fluctuate with the transaction volume of bitcoin. In June 2017, the transaction handling fee of less than 1 millibit has been far greater than the transaction amount; In December 2017, steam announced that it would stop accepting bitcoin because of "high transaction costs and high volatility". In February 2018, the average transaction handling charge dropped from $34 in the fourth quarter of 2017 to about $1. This problem is being solved by technologies such as lightning network to expand the transaction volume of bitcoin within a certain period of time
P2P can refer to:
peer-to-peer, a network technology and network topology

file sharing, often using point-to-point technology
point-to-point protocol, which is used for dial-up computing, is usually abbreviated as PPP
Peer-to-Peer Lending, also known as P2P lending, is also known as Internet lending and P2P financing in Chinese mainland.
pay to play
a method for preparing methamphetamine from methylamine.

5.

Let's suppose villagers Lao Wang and Xiao Li. Lao Wang borrowed some money from Xiao Li, who wrote it in an IOU signed by both parties. A few days later, Lao Wang denied the existence of borrowing money and claimed that Xiao Li forged the paper. Xiao Li can't argue because he finds it difficult to prove that Lao Wang actually owes him money

in this example, Lao Wang and Xiao Li are two nodes

now assuming the same scenario, there are many pairs of people trading with each other in the village. The only evidence for each pair is the IOU. If one party fails, it will be difficult to do so. Seeing this scene, the village head came up with a solution. He suggested using a common notebook for the whole village to record all the transactions. Due to the high prestige of the village head, the villagers unanimously decided to let the village head keep this important transaction book. Each transaction, the villagers go to the village head's home, let the village head witness and record, each transaction is written into a notebook, and then safely saved. That notebook can be called a database

because this notebook is very important, the village head locked it in the safe. However, there are always some problems. Sometimes, the village head will accidentally sprinkle ink on the paper, making some transaction records illegible. This is called a single point of failure. The thief knows that there is an important notebook in the safe of the village head's house. He tries his best to steal it. This is called hacking

until one day, the village head's son owed others a lot of money, so the village head secretly deleted his son's debt entry. In this way, the village head's son "does not owe money."

when the villagers knew this, they began to question the fairness and authority of the village head. So some people put forward a new idea:

abolish the power of the village head, which is called decentralization. Let all villagers keep a notebook, and the transaction records are copied and distributed, which is called distributed database. Therefore, if there are n people in the village, there are n notebooks, that is, n nodes. Every time there is a trade between any two people, all the people in the village get together and record it in their notebooks. And no one can cover the sky. This is called decentralization

they also decided that they would never delete the mentioned transactions from their notebooks, which is irreversible. For example, Lao Wang borrowed a sum of money from Xiao Li before, but in the twinkling of an eye, he wants to return the money. Then the transaction book will not delete the previous borrowing record, but write a new repayment record, so there are two records

next, let's try to break this rule. What if we bribe Lao Wang to change his notebook? It's not feasible, because the next time the villagers meet, they find that Lao Wang's notebook is different from everyone else's, so the villagers notice that Lao Wang may be engaged in an indescribable transaction, and decide to abolish Lao Wang's transaction record and kick Lao Wang out of the organization

What if you try to bribe all the villagers? It's too expensive

the characteristic of this model is that greedy people need to pay a lot to attack the rules. He will find it more profitable to follow the rules

a smart child in the village suggested that each transaction data be called "block" and linked into a "chain" in chronological order, which is called blockchain