![]() To encrypt the key, use the rails console and run the following command: decrypted_key = Eth::Key.decrypt File.read('./some/path.json'), 'account_password'. You’ll get your wallet in the form of a JSON file. To get your private key go to account manager, choose the account and click Export. You can create it using the parity interface. We will need two wallets for both admin and user account. Then visit localhost:8180 you should see the parity interface. To run dev (local) blockchain use command parity -chain=dev. At the ethereum.rb GitHub repository you can find detailed instruction on how to install parity: I chose Parity because it is supported by ethereum.rb – gem which we will use and also it’s got a built-in UI to interact with blockchain. To test and set up our application, we start node on our machine. Each user is obliged to have an account on blockchain (a wallet).įirst, we need to make some preparations before we start coding. Users can only vote (once) and see results.Administrator should be able to create voting, choose which users could vote and meal types to vote for. ![]() In this tutorial, we will create a lunch voting application. When we’re dealing with dApp you don’t really know what will happen to the key you’re sending. The same is true when you log in to your bank, so why did I say it’s unsafe? The only difference is that bank is a trusted institution, it adds a sense of responsibility to your transactions. When you only use a UI to make transactions with blockchain, you don’t send your private key anywhere, with a server you need to pass it using a form. Why we do it? Because we can □ It’s all about safety and safety in the Blockchain world is mostly about keeping your private key safe. Ok… so why does this tutorial show how to connect blockchain with Ruby on Rails? Didn’t I just mention that decentralized apps don’t include server-backend-side? Yes, it’s true. The client-side application needs to know the address of smart contract in blockchain. The interface only allows calls with smart contract methods. ![]() The code is stored in a blockchain and users connect directly to it via UI, so all actions, like creating and signing transaction should be executed client side. In a decentralized app, we don’t have server side because we don’t want to store any data on unsafe servers. User interacts with the application via UI which is a part of (or strictly connected with) the server. In a standard case, the main part is a server which holds the code of the app and connects to a database which stores all necessary information. Decentralized applicationīefore we start implementing our application we need to understand the differences between a common, centralized application and designing a blockchain-based system. It doesn’t cover deep knowledge of blockchain, only a basic introduction that helps to understand how it works and how to design dApp architecture. This tutorial shows how to work with blockchain using Ruby and how to create a decentralized application based on Ruby on Rails. Blockchain allows us to create applications which do not depend on the centralized resource. People who had never invested, now compulsively bought and traded coins or tokens in the exchange.īut for me the biggest discovery related to cryptocurrencies is blockchain – technology on which Bitcoins, Ether and other ones depend, a technology which could change our finances, politics (eg. The value of Bitcoin (BTC) or Ether (ETH) multiplied and reached an astronomical amount of money. At the end of 2017, the world got mad about cryptocurrencies.
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