Binance coin js
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- How to create a simple Bitcoin API with Node.js & GraphQL
- Bitcoin-Kurs aktuell & heute: Fed-Entscheidung gefällt
- Try Max Free for 30 Days
- Binance Coin price needs to reclaim $414 to avoid further losses
- Cryptocurrency prices and data from Binance with Node-RED: tutorial
- How To Transfer DOT Token from Binance to Polkadot.JS Wallet ✅
- Import Binance Data to Google Sheets
- Binance Wallet
- Mech Master NFT Ticket Sale to go live on Binance Starting January 28th
How to create a simple Bitcoin API with Node.js & GraphQL
John Agbanusi is a passionate full stack developer, a developer at Meet Kumba and an active open source contributor to the free open source softwares.
Trusted by Blockchain technology has been on the rise in the past ten years, and has brought a good number of products and platforms to life such as Chainalysis finance tech , Burstiq health-tech , Filament IoT , Opus music streaming and Ocular cybersecurity. From these examples, we can see that blockchain cuts across many products and use cases — making it very essential and useful.
Ocular uses security that comes with blockchain for identity management for biometric systems, while Filament uses blockchain ledgers for real-time encrypted communication. This goes to show how essential blockchain has become to us by making our lives better. But what exactly is a blockchain? A blockchain is a database that is shared across a network of computers. Once a record has been added to the chain, it is quite difficult to change.
To ensure that all the copies of the database are the same, the network makes constant checks. So why do we need blockchain? Blockchain is a safe way to record activities and keep data fresh while maintaining a record of its history compared to the traditional records or databases where hacks, errors, and downtimes are very possible.
Because the whole blockchain is duplicated across many computers, any user can view the entire blockchain. Transactions or records are processed not by one central administrator, but by a network of users who work to verify the data and achieve a consensus. Applications that use blockchain are called dApps Decentralised Applications. So, when would it make sense to consider using blockchain for our applications, rather than a standard database or record? Now, we have seen quite a number of the advantages of using blockchain, but when should we not bother using a blockchain at all?
Bitcoin which is a cryptocurrency is one popular example of a blockchain, a popular blockchain that has been on the rise aside from bitcoin cryptocurrency is Ethereum blockchain. Bitcoin focuses on cryptocurrencies while Ethereum focuses more on smart contracts which have been the major driving force for the new tech platforms.
Recommended reading : Bitcoin vs. The ultimate goal is to get a good understanding of how dApps and Blockchain platforms are being built. Most dApps have similar architecture and structure. Basically, we have a user that interacts with the dApp frontend — either web or mobile — which then interacts with the backend APIs. The backend, then, on request interacts with the smart contract s or blockchain through public nodes; these either run Node.
There are still so many things in between these processes from choosing to build a fully decentralized application or semi-decentralized application to choosing what should be decentralized and how to safely store private keys.
We will be building this with Node. Here are some tools that we should have at our disposal for building or working with Ethereum and Node. When we want to create a new Node. As you probably know, npm stands for Node Package Manager , and it comes prepackaged with the Node.
We open the terminal in that folder directory, and then run the following command:. This starts up the project with a package. Then we also create a server. After all these, you will have to install packages that we need to make our build easy and straightforward. This process is a continuous one, i.
If you want to install all of them at once, run the following code in your Terminal:. The -g flag is to store this particular package globally, so that we can use it in any project we are going to work on.
We then create an. We do so by running touch. The dotenv package exports our stored variable to the Node. Next, we have to add scripts for build and development phases of our project in our package. Currently our package. Next, we have to initialize Truffle for use in our smart contract by using the Truffle package we installed globally earlier.
In the same folder of our projects, we run the following command below in our terminal:. Then we can start writing our code in our server.
Our server. Our example server. Basically, above we import the libraries that we need with require , then add a middleware that allows the use of JSON in our API using app. After this, we call the function and import it from the routes file. Finally, we listen for any attempted connections on port This server. Notice that we imported routes. This file will hold the route endpoints for our API.
We also imported the packages we needed to use in the server. Then we write our route functions in our routes.
We utilize the database storage and retrieval features, and then make sure we export the route function at the end of the file to make it possible to be imported in another file or folder.
Inside this route function, we have many other functions called within both the app and db parameters. Ultimately we choose one of these functions to be executed and provide results as response to incoming requests. In this routes function, we used the get and post operations. We use post for registration, login, and upload operations, and get for accessing the data operations. In the code above, we can also see some database operations like in the register route.
We stored the email of a new user with db. Now, before we can do all of it, we need to name a collection or table with the db. The data we want to store is the music file data, meaning that we have to upload the music to IPFS, then store the address of the buffer in a blockchain. First, we create a new file in the contract folder and name it Inbox.
Before we talk about the functions, we can see that we had to define a contract first called Inbox. Inside this class, we have structures used in the ipfsInbox object first events, then modifiers. After defining the structures and events, we have to initialize the contract by calling the constructor function.
Then we defined three functions. The checkInbox function was used in the test for testing results. The sendIPFS is where the user inputs the identifier and hash address after which it is stored on the blockchain.
The getHash function retrieves the hash address when it is given the identifier. Again, the logic behind this is that we ultimately want to store the music in IPFS. But first, we need to make some changes to our files and set up our emulator using ganache-cli :. In the same directory, run the following command in your terminal:. This starts up the emulator for our blockchain contract to connect and work.
Now go to the truffle. Basically what we did is adding the path of the build folder where the smart contract is converted to JSON files. Then we also specified the network that Truffle should use for migration. We did so to get the contract file and deploy it automatically to a JSON, using the deployer function during the Truffle migration.
We have built our API with Node. We should also write tests for our contract to test the behaviour of our contract and ensure it is the desired behaviour. The tests are usually written and placed in the test folder. An example test written in a file named InboxTest. It tests our contract with the files in the test folder and shows the number of passed and failed tests.
For this tutorial, we should get:. Most times when you see tutorials, you see decentralized apps built to integrate the frontend directly to the blockchain. But there are times when the integration to the backend is needed as well, for example when using third-party backend APIs and services, or when using blockchain to build a CMS.
The use of Web3 is very important to this cause, as it helps us access remote or local Ethereum nodes and use them in our applications. To dive in deeper, you can follow a tutorial on how to deploy on ropsten 5-minute guide to deploying smart contracts with Truffle and Ropsten or you could use truffle wallet provider and deploy via An Easier Way to Deploy Your Smart Contracts.
We are using ganache-cli in this tutorial, but if we were deploying on ropsten, we should have copied or stored our contract address somewhere like in our. In the server.
If not, we initialize it on the network port which we defined earlier Then we build a contract based on the migrated JSON file and truffle-contract package, and set the contract provider to the Web3 instance provider which must have been initialized by now.
We then get accounts by web3. For the development stage, we call the deployed function in our contract class that asks ganache-cli — which is still running — to give us a contract address to use. The sample function is commented below the defined lms variable in our code above. Then we call the routes function inputting the app instance, database instance, contract instance lms , and accounts data as arguments. Finally, we listen for requests on port Once we have that, we move onto the routes page where we use the methods defined in the contract to accomplish tasks like saving and retrieving the music data.
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Ethereum Stack Exchange is a question and answer site for users of Ethereum, the decentralized application platform and smart contract enabled blockchain. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. The router contract has functions called getAmountsOut and getAmountsIn , use them. It accounts for price impact itself, you don't have to worry about that.
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Cryptocurrency prices and data from Binance with Node-RED: tutorial
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How To Transfer DOT Token from Binance to Polkadot.JS Wallet ✅
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