Digital currency icon

1.

ICO (abbreviated as initial coin offering) is the concept of initial public offering (IPO) derived from the stock market. It is the behavior of blockchain project to issue token for the first time and raise bitcoin, ethereum and other general digital currencies

brief introction to ICO:

ICO is a blockchain instry term, which is a common way to raise funds for cryptocurrency / blockchain projects. Early participants can get the cryptocurrency generated initially as a return

because the token has market value, it can be converted into legal currency to support the development cost of the project. The tokens issued by ICO can be based on different blockchains. The common issue is based on Eth and BTS blockchain, which provides bookkeeping service and value consensus to realize global issue and circulation

ICO participants are very important for the success of a project. They will publicize the blockchain project in the community, so that the tokens generated by it can obtain liquidity before the transaction starts. However, the most important value of ICO participants is still the potential benefits brought by the project development or the price appreciation after the token issue

extended information:

domestic prohibition:

at 3:00 p.m. on September 4, 2017, the people's Bank of China led seven ministries and commissions, including the Information Office of the people's Bank of China, the Ministry of instry and information technology, the State Administration for Instry and commerce, the China Banking Regulatory Commission, the China Securities Regulatory Commission and the China Insurance Regulatory Commission, to issue the announcement on preventing the financing risk of token issuance (hereinafter referred to as the announcement)

the announcement points out that token issuance financing is essentially an unauthorized illegal public financing behavior, which requires that all kinds of token issuance financing activities should be stopped immediately from the date of the announcement, and at the same time, organizations and indivials who have completed token issuance financing should make arrangements such as refund

2.

The digital currency wallet is the hardware wallet, which means that the private key of digital assets is stored in a single chip, isolated from the Internet, plug and play. Hardware wallet can't guarantee 100% security. For example, if a geek gets your hardware wallet and doesn't know your private key, it may be cracked by violence. It's just one of the safest storage methods compared to other storage methods

many block chain entrepreneurs at home and abroad are optimistic about the development of this field, so they begin to build more hardware wallets. In the case of the exchange being stolen a lot of money and the software wallet being stolen from time to time, many investors regard the hardware wallet as the last moat

extended information:

whether the hardware wallet is safe

the hardware wallet can not guarantee 100% security. For example, if a geek obtains your hardware wallet, it may be cracked violently even if it doesn't know your hardware wallet immediately. It's just one of the safest storage methods compared to other storage methods

of course, there are exceptions, such as you have unlimited brain power and never forget. It's better to save it anywhere than in your own mind

3. Digital currency is a kind of virtual currency, so the pictures of digital currency are virtual. Unlike RMB, it really exists. Specific digital currency pictures can be viewed at bitnet exchange.

4. < UL >

ICO has two important meanings

ICO is the icon file format of windows. Icon files can store icon files of single pattern, multi size and multi color board. An icon is actually a collection of images in different formats, and also contains a certain transparent area

ICO (abbreviated as initial coin offering) is an IPO concept originated from the stock market. It is a behavior of blockchain project to issue token for the first time, raise bitcoin, solve Ethereum and other common digital currencies

5. All digital currency virtual currencies are illegal in China, and a large part of them are pyramid schemes fraud organizations. Be careful of pyramid schemes fraudsters
digital currency virtual currencies are illegal in China, even if they are legal in foreign countries, and are not protected by Chinese laws. If the platform collapses, you will lose all your money, and safeguarding your rights is a problem

6. Legal holding, illegal centralized exchange

7. If the number of people grows exponentially, then the capital will also grow exponentially, and the speed of collapse will accelerate
this can't be judged. When you see Tiano enter the game, it will almost collapse

8.

Examples of coin symbols in various countries are as follows:

1. China: "Yuan" is the currency symbol of RMB

On March 1, 1955, when the people's Bank of China issued the second set of RMB, the currency symbol of RMB was officially determined for the first time. Because the unit of RMB is "Yuan", and the Chinese phonetic alphabet of "Yuan" is "Yuan", the capital letter "Y" of the initial letter of the Chinese phonetic alphabet of the word "Yuan" is used as the currency symbol of RMB

in order to prevent the misunderstanding and miswriting of "Y" and Arabic numerals, a horizontal line is added to "Y", and the pronunciation is still "Yuan"

2. The United States: "$" is the symbol of the dollar

"US dollar" is the official currency of the United States, also known as US dollar and US dollar. Its emergence was e to the passing of the mint tax act of 1792. It is also widely used as a reserve currency outside the United States. Currently, the issuance of dollars is controlled by the Federal Reserve

the most commonly used symbol of US dollar is "$", while the symbol of cent is "&" 162; ". ISO 4217 standard code is adopted by ISO

< P >

< 3. Canada: the Canadian dollar symbol "C $"

< p. The Central Bank of Canada was established in 1934, known as the Bank of Canada. The Bank of Canada issues currency in Canada. Canadian cash has five denominations: 5 yuan, 10 yuan, 20 yuan, 50 yuan and 100 yuan. The Canadian dollar also has one, two and one, five, ten and twenty-five coins

4. Euro, the symbol is "€"

The euro is the currency of 19 European Union countries. The 19 members of the eurozone are Germany, France, Italy, the Netherlands, Belgium, Luxembourg, Ireland, Spain, Portugal, Austria, Finland, Lithuania, Latvian, Estonian, Slovak, Slovenian, Greek, Maltese and Cyprus

on January 1, 1999, the countries implementing euro in EU implemented the single currency law. In July 2002, the euro became the only legal currency in the euro area

5. Ruble, symbol "&" 8381; "

The ruble is the earliest monetary unit in czarist Russia. The price of gold was set in 1800. In 1897, the gold content of ruble notes was 0.774234 grams

After the October Revolution, the Soviet government continued to use the Russian ruble. In 1921, a new ruble was issued, stipulating that 10000 old rubles should be exchanged for new rubles

In October 1922, the denomination of banknotes decreased for the second time, and the new rubles were exchanged for 100 rubles issued in 1921. In October 1922, the State Bank of the Russian Republic issued chelvin banknotes. Each banknote contains 7.742 grams of gold, which is guaranteed by 25% gold and 75% commodities. Its gold content is the same as the Russian gold ruble used by the Soviet Union for foreign exchange trade settlement

9. I think it's convenient and safe to use kushenleng wallet, because the part storing digital currency can only communicate through two-dimensional code, it won't touch the network, and it's very safe to store.

10.

Why develop digital currency? From the perspective of the central bank, there are six advantages:

first, to improve the convenience and transparency of economic transactions; second, to rece the high cost of the issuance and circulation of traditional paper money; third, to better support economic and social development; fourth, to help the comprehensive realization of Inclusive Finance; fifth, to rece money laundering, to promote the development of the economy and society Sixth, improve the central bank's control over money supply and circulation

steps of digital currency development:

the first step,

first, we need to download the source code of a blockchain system from git, such as choosing the backbone code of bitcoin to download the relevant source code

At the same time, prepare the corresponding compiling environment (c + + is recommended in Linux) and install the corresponding development environment and tools

the second step and

code all need to be compiled, so you need to prepare the compilation environment and tools, download the environment compilation tools, configure

system environment variables, QT environment and other files, and compile commands are described in detail in the files in ITC source code

however, the construction of the system and development environment, program compilation and other processes are cumbersome, so it is not recommended for ordinary users to make their own. For developers, it may take 2-3 days to install and configure for the first time

the third step,

take bitcoin development as an example, it is the development environment of Q. after downloading the source code and configuring the environment, open the source code of the bitcoin core in qtcreator, configure relevant files and compilers, and start to try to compile the client of the bitcoin core

Step 4,

transform into your own digital currency, open each source file, find the corresponding local adjustment parameters, such as adjusting

the number of coins in each block, the total output, the adjustment difficulty, and so on. Then the most critical point is to change the name to your own currency

name as you want, and don't forget to replace the related icons in the resource folder. If all goes well, after re compiling, your new coin will be invented successfully

for the development of this digital currency, the technology is relatively professional, so it is better to have a professional team to assist

framework for digital currency development:

1. Build Ethereum private chain test environment and public chain node environment configuration

2. Ethereum transaction and confirmation principle

3. Ethereum JSON RPC interface

4. Ethereum transfer and withdrawal principle

5. The server connects Ethereum public chain interface, and its own server stores business data, Public chain storage transaction anonymous data

6, private key security processing

the following is the development code example:

for example, the common digital currency wallets in the market are:

app class: kcash Imtokenweb: myethereumwallet Google browser plug-in: metamask

one of the most commonly used is imtoken

blockchain transaction technology concept:

let's take a look at how blockchain transaction is handled with bitcoin as an example. In order to send a certain amount of bitcoin to another wallet, you need the following information: the address to send the funds to your wallet, the amount of cryptocurrency you want to send

the ID of the recipient's wallet

each transaction is signed with a unique confidential private key. Once the payment is signed by the sender, it becomes publicly available. The transaction still needs to be confirmed so that the payee can get the money. In order to confirm the transaction, it is necessary to generate a new chain block

these blocks are generated by complex mathematical calculation to find the unique key. It takes 10 minutes to create a new block, and the person who finds the key gets a certain amount of coins as a reward. Once a new block of the chain is created, it is not possible to remove it from the database or change the information in some way. Therefore, blockchain transaction is final and irreversible

three core advantages of digital currency:

first, digital currency is a fair currency

digital currency has no specific issuing institution, is not issued by a country, only depends on a specific algorithm, which means that digital currency can not be manipulated by manipulating the number of issues, so digital currency is a free, non-state currency

we can see that there are many countries that directly recognize the virtual currency, so if there is a demand, it needs a trading platform

many investors who want to build a virtual currency trading platform now, why can't they go to these areas to build a trading platform? Building a virtual currency trading platform is a good business opportunity, isn't it

Second, the security factor of digital currency is higher.

although the emergence of paper money facilitates the transactions in our daily life, there are risks of being stolen and received. Although e-money can avoid these risks, there will be new problems such as theft and swiping

digital currency can avoid the above problems. And broadcast every transaction record on the network. Yes, all nodes save all the currency circulation information, so that any node can easily find the currency circulation before the transaction

Thirdly, the transaction of digital currency can realize anonymous transaction. Although you can query the flow information of each account according to the local complete transaction records

but we can't know who the owner of this account is, and no one has the ability to manipulate the digital currency on other people's accounts, which protects the privacy of users

if you also hold trading digital currency, foreign exchange gold, crude oil, contract Futures: