1. decentralised applications, also known as DApps (decentralised applications), are the next logical step in the evolution of technology, built on the underlying blockchain development platform and can be understood as an upgraded version of an app. a decentralised application, similar to smart contracts on ethereum, but also with key differences - -unlike smart contracts, a Dapp need not revolve around finance alone, but can also use blockchain technology for any conceivable purpose. (1) What is a decentralised application Dapp is the full name of a decentralised application. As opposed to apps that used to run on centralised servers, Dapp applications are deployed on a distributed network where all data is open, transparent and untamperable. In a traditional game, for example, the data is stored on a centralised server, so the developer has absolute control over the game and can modify the rules and content of the game at will without anyone knowing. The developer has no control over the game assets. (2) Differences between decentralised applications and traditional applications (1) The back-end code of a traditional application runs on a centralised server, but the back-end code of a DApp runs on a decentralised peer-to-peer network. (ii) The front-end code and interactive interface of a DApp can be written in any language and the back-end can respond. (3) The front-end of the DApp can be stored on a distributed storage network like Swarm and IPFS. (3) Criteria for decentralised applications ① The application must be fully open source It must be open source and autonomous, and no single subject has full control over the token of the application. The application must be upgraded based on proposed improvements and user feedback, and all changes and upgrades must be agreed upon by a majority of users. ②Encrypted storage of application data and operation records The application's data and operation records must be stored encrypted on a publicly available decentralised blockchain to avoid any risk of centralisation. ③Use of common tokens based on the underlying public chain It is necessary to use a common token based on the underlying public chain such as Bitcoin or to issue new coins on your own, so that all contributors to the system ecosystem (including miners or application maintenance nodes) are rewarded with the appropriate tokens ④ Generation of application tokens The contribution of a node to an application must be proven as a contribution value according to a standard cryptographic algorithm to obtain the corresponding token reward (Bitcoin uses a POW proof of work) (4) Differences between decentralised applications and smart contracts -Traditional web applications rendered using HTML, CSS and javascript, it requires API access to a database to get data, when you log in to Facebook, the page calls the API to grab your personal information so it can be displayed on the page. Traditional website: front-end -> API -> database -dApps dApps is similar to a traditional website application in that the front-end uses exactly the same technology to display the page, the only difference being that instead of accessing the database through an API interface, smart contracts are used that can connect to the blockchain. dApps: Front-end -> Smart Contracts -> Blockchain -as opposed to traditional centralised applications (where their back-end code runs on a centralised server), dApps run their back-end code on a decentralised P2P network, forming a decentralised application from the front-end to the back-end, of which smart contracts are only one part of the dApp. Front-end (i.e. the display seen on the front-end) Back-end (i.e. the application logic behind it) On the other hand, a smart contract is usually only a small part of the whole dApp, which means that if you want to create a decentralised application on a smart contract system, you need to combine several smart contracts and require a third party system to provide the front-end. dApps can write front-end code and user interfaces in any language and can also be used to call back-end applications, in addition to the front-end code being hosted on distributed storage (e.g. Swarm or IPFS).

2. The content introduced above is only about the basics of cryptocurrency, which is related to whether we can make money through cryptocurrency. Cryptocurrencies make money not only by scientific methods to increase income, but also by finding ways to save money. The handling fees are small, but they must not be ignored. I have calculated that with frequent transactions and long trading hours, the accumulation of fees can add up to more than 10,000 U a year. Next I will introduce a few common ways to reduce fees on large trading platforms. (1) Lowering Binance's fees Binance is currently the world's largest digital currency exchange, and you must sign up for Binance if you want to speculate on coins. The transaction fee is deducted from the assets received. For example, if you buy Ethereum/USDT, the fee is paid in Ethereum. If you sell Ethereum/USDT, the commission is paid in USDT. Example. You place an order for 10Ethereum at a price of USD3,452.55 per share. Transaction fee = 10Ethereum0.1% = 0.01Ethereum Or you place an order to sell 10Ethereum at 3,452.55 USDT per share. Transaction fee = (10Ethereum3,452.55USDT)*0.1% = 34.5255USDT What many people do not know is that the Binance transaction fee can also be reduced. If you want to reduce your Binance trading fees, you must register using the invitation link below or use the invitation code "Q022W7SC". https://accounts.binance.com/en/register?ref=Q022W7SC

(2) Reducing OKX fees OKX is a professional digital currency trading platform loved by many users, and its transaction fees can be reduced. Depending on the volume of transactions, OKX divides its users into two levels: normal and professional. Ordinary users are graded according to their OKB positions, while professional users are graded according to their trading volume and asset size. The different tiers determine the trading fees for the next trading day. When calculating the fee levels, if the coin trading volume, total trading volume of delivery and perpetual contracts (USDT delivery contract, coin-based delivery contract, USDT perpetual contract, coin-based perpetual contract), option contract trading volume, and asset volume meet the conditions of different fee levels, users will enjoy the fee discount of the highest level. First method: OKX has an official maximum saving of 20%. Use the link below to register with OKX and save 20% on fees. https://www.ouyi.business/join/BTC1ETH Second method: Open the OKX website and enter "BTC1ETH" in the "Invitation Code" on the registration page to see the cashback percentage: 20% at the bottom. Be sure to enter this invitation code, otherwise you can not get 20% cashback percentage. (3) Reduce FTX fees FTX is currently a very fast-growing, contract players more exchange, you must register FTX if you play the contract. if you want to reduce the FTX transaction fees, you must use the following invitation link to register. https://ftx.com/referrals#a=121031692 3, trading road is long, together with forward Want to know more about how to reduce the commission? telegram: btcethcool We have set up a community dedicated to researching trading, add telegram friends to pull you into the community.