The first article relating to Truffle Boxes, , introduces the RSK specialized . RSK Using Truffle Boxes on RSK network Truffle Boxes We already presented the in the second article: , the first box to start using smart contracts on the RSK Network. rsk-starter-box How To Use RSK Starter Box Now, this third article in the series is a step-by-step tutorial to guide you on how to use the , which comes with everything you need to create a complete dApp - decentralized application on RSK networks. It includes network configurations for Mainnet, Testnet, local node (regtest) and also an user interface to interact with the smart contract. rsk-plant-box Requirements POSIX compliant shell Curl Node.js and NPM (Node Package Manager) Code editor: Visual Studio Code (VSCode) or any other editor of your choice Truffle The requirements are explained in detail in this tutorial on: How To Set Up An RSK Project Using Truffle And Open Zeppelin Create the project The command sets up a project based on a known template. In this tutorial, we will be using the Truffle box, which comes with everything you need to build a complete dApp on RSK networks, including a frontend. truffle unbox RSK plant box 1. Create a new folder For example, create the folder rsk-plant. Navigate to the folder in the terminal. 2. Run the unbox command The command will install all necessary dependencies in the project. truffle unbox Take a look at the commands below: mkdir rsk-plant
cd rsk-plant
truffle unbox rsksmart/rsk-plant-box This is the result using Windows OS: PlantShop.sol Take a look at the smart contract PlantShop.sol. You can check it out in folder contracts. This smart contract has: A variable buyers to store an array with 16 positions to store addresses A function getBuyers to return the list of addresses stored at variable buyers A function buy to update an address at variable buyers, in the number of position sent as parameter Compile a smart contract In the Truffle console, run this command: truffle compile The compile output should be similar to: Truffle development console Truffle has an interactive console that also spawns a development blockchain. In the article , we presented how to use the Truffle develop console for compiling, deploying and testing locally. How To Use RSK Starter Box Using RSK networks Truffle makes developing on RSK easier because we can configure custom networks for RSK. This Truffle box is already configured to connect to three RSK networks: regtest (local node) testnet mainnet These networks are already configured in the file. Testnet will be used in this tutorial. truffle-config.js RSK testnet We need to do some tasks: Setup an account / create a wallet Update .secret Connect to an RSK network Get tR-BTC Setup RSK network gas price Deploy in the network of your choice Create a wallet The easy way to set up an account is by using a web3 wallet injected in the browser. I suggest you use wallet, because Nifty comes configured for RSK networks. Nifty Select the RSK Network in the web wallet. Take a look at file, this shows we are using HDWalletProvider with RSK Networks derivations path: truffle-config.js RSK Testnet dpath: m/44’/37310’/0’/0 RSK Mainnet dpath: m/44’/137’/0’/0 For more information, check . RSKIP57 Update .secret file After creating your wallet, copy your mnemonic. Paste the wallet mnemonic in the file .secret, located in the folder project, and save it. Connect to an RSK network Run the development console for any RSK network. Let's connect to the Testnet network: truffle --network testnet console This action instructs Truffle to connect to an RSK public node and grants it permission to control the accounts created with your mnemonic through the HD wallet provider. Test the connection to RSK network On any of the networks, run this commands in the Truffle console: Block number Shows the last block number. ( web3.eth.getBlockNumber()).toString() await Network ID To get the network ID, run this command: ( web3.eth.net.getId()).toString() await List of network IDs: mainnet: 30 testnet: 31 regtest (local node): 33 Check it out the last steps in this image: You can verify that I got the last block twice, and the block number increased, so we conclude that the connection is ok. Accounts To get your accounts, in the Truffle console, enter: accounts = web3.eth.getAccounts() const await To list the accounts, in the Truffle console, enter: accounts To view each account: accounts[ ]
accounts[ ]
... 0 1 Check balance To check the balance of account[0], for example, run this command in Truffle console: ( web3.eth.getBalance(accounts[ ])).toString() await 0 The balance is 0 and we need some tR-BTC to pay gas fees, which will be used to publish smart contracts and interact with them. We shall obtain some tR-BTC in the next step. Get R-BTC The Smart Bitcoin (R-BTC) is the token used to pay for the execution of transactions in RSK. Get tR-BTC from for Testnet. our faucet Recheck balance To check balance again, run this command in the Truffle console: ( web3.eth.getBalance(accounts[ ])).toString() await 0 Exit Truffle console In the Truffle console, enter this command to exit the terminal: .exit Setup the gas price Gas is the internal pricing for running a transaction or contract. When you send tokens, interact with a contract, send R-BTC, or do anything else on the blockchain, you must pay for that computation, that payment is calculated as gas. In RSK, this is paid in R-BTC. The minimumGasPrice is written in the block header by miners and establishes the minimum gas price that a transaction should have in order to be included in that block. To update the minimumGasPrice in our project, in the project folder, run this query in a POSIX terminal using cURL: curl https: --data \
    > .minimum-gas-price-testnet.json //public-node.testnet.rsk.co/ -X POST -H "Content-Type: application/json" \ '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["latest",false],"id":1}' This query saved the details of the latest block to file . .minimum-gas-price-testnet.json In the , we are reading the parameter minimumGasPrice in each json file. truffle-config.js For more information about the Gas and minimumGasPrice please go to the . gas page Deploy the smart contract on RSK network Now let’s switch to interacting with a "real" blockchain, which is running on multiple nodes distributed around the world, across multiple computers! We will deploy it by running the below commands directly in the terminal, without using the Truffle console, to show an alternative. To use Testnet or Mainnet, you need to specify this using the parameter -- network. On any of the networks, run this command in a terminal (not in Truffle console). truffle migrate --network testnet The migrate process in a real blockchain takes more time, because Truffle creates some transactions which need to be mined on the blockchain. Wait a few minutes… Congratulations! The plant shop is now published on the RSK network. Make sure you have enough tR-BTC to deploy it. View the deployed contract in the Testnet explorer You can copy the contract address and view it in the . Testnet explorer For example, is the contract address for my last deploy. 0x3A6Dd83F76eCceA654bDc4ea29170B8A34A9e270 If you would like to have the code source verified, you can do it in the tab Code in the explorer. The dApp Included with the plant-shop Truffle Box was the code for the app's front-end. That code exists within the src directory. The front-end doesn't use a build system (webpack, grunt, etc.) to be as easy as possible to get started. The structure of the app is already there, including the functions to interact with the smart contract on Blockchain This way, you can take this knowledge and apply it to your own front-end development. Select the network To interact with the dapp in a browser, the easy way is using a web3 wallet injected in the browser. Be sure to select the RSK testnet in the web wallet. The lite-server We're using the package to serve our static files. This shipped with the plant-shop Truffle Box, but let's take a look at how it works. lite-server Running the server Now we're ready to use our dapp! Outside the Truffle console, in a terminal, run the liteserver development server for front-end hot reloading. Smart contract changes must be manually recompiled and migrated. Start the local web server: npm run dev The dev server will launch and automatically open a new browser tab containing your dapp. It is running at http://localhost:3000 You can realize that some plants show the first characters of an account, which was bought before, using the Truffle console. Buying plants In our garden store, don't worry about the prices, the plants are free! To use the dapp, click the Get button on the plant of your choice. You'll be automatically prompted to approve the transaction by the web wallet. Click Submit / Confirm to approve the transaction. I will buy the coffee plant: After the transaction is confirmed, you'll see the button next to the chosen plant change to show the first characters of the wallet that got the plant and become disabled, just as we specified, because the plant has now been acquired. If the button doesn't automatically change to show the account, refreshing the app in the browser should trigger it. Final considerations Congratulations👏👏👏! You built and ran a complete dApp on RSK network! In this tutorial you learned how to use the Truffle box to create a complete dApp on RSK blockchain. rsk-plant-box Our goal is to join forces and give options to people who believe in smart contracts based on Ethereum, and also believe in the power of Bitcoin, through RSK. Check out RSK Blockchain for more details about us. I hope this tutorial has been helpful and I’d appreciate your feedback. Share it if you like it :) Do you have questions? Ask in RSK chat Author: Solange Gueiros Reviewer: Owanate Amachree

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