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Creating and Deploying a Tezos Smart Contract with FA 1.2 Token Standard

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Harikrishnan Kannoth
·

4 min read

Table of contents

Introduction:

Welcome to this in-depth tutorial on creating and deploying a Tezos smart contract with the FA 1.2 token standard. In this tutorial, we will guide you through the process of setting up a new Tezos project, writing a smart contract in SmartPy, implementing the FA 1.2 token standard for fungible tokens, compiling the smart contract, deploying it to the Tezos blockchain, transferring tokens to different accounts, and testing the smart contract. We will provide examples and detailed commands to be used throughout the tutorial. Let's get started!

Section 1: Setting up the Development Environment

  1. Install Dependencies:

    • Install Node.js and npm (Node Package Manager) on your machine if you haven't already.

    • Create a new project directory for your Tezos project.

  2. Initialize the Project:

    • Open a command-line interface and navigate to your project directory.

    • Run the following command to initialize a new Node.js project:

        npm init -y

  3. Install Required Packages:

    • Install the necessary packages for your Tezos project. For example:

      • Tezos Client:

          npm install -g @taquito/cli

Section 2: Writing the Smart Contract

  1. Create the Smart Contract File:

    • Inside your project directory, create a new file named tokenContract.py (for SmartPy).

  2. Implement the FA 1.2 Token Standard in SmartPy:

    • Open tokenContract.py and write the following code:

        import smartpy as sp

  class Token(sp.Contract):
      def __init__(self, tokenOwner):
          self.init(balance = sp.big_map(tvalue=sp.TNat), owner = tokenOwner)

      @sp.entry_point
      def transfer(self, params):
          sp.verify(self.data.balance[params.sender] >= params.amount)
          self.data.balance[params.sender] -= params.amount
          self.data.balance[params.recipient] += params.amount

  @sp.add_test(name="Transfer Test")
  def test():
      scenario = sp.test_scenario()
      tokenOwner = sp.test_account("Token Owner")
      recipient = sp.test_account("Recipient")
      contract = Token(tokenOwner.address)
      scenario += contract
      scenario.h1("Transfer tokens")
      scenario += contract.transfer(params={'sender': tokenOwner.address, 'recipient': recipient.address, 'amount': 100})

Section 3: Compiling and Deploying the Smart Contract

  1. Compile the Smart Contract:

    • Open a command-line interface and navigate to your project directory.

    • Run the following command to compile the SmartPy smart contract:

        npx sp-compile tokenContract.py

  2. Deploy the Smart Contract:

    • Choose a Tezos network to deploy your smart contract. For this tutorial, we will use the Delphinet testnet.

    • Ensure you have a funded testnet account. If not, create one and obtain some testnet XTZ (Tezos tokens) from a testnet faucet.

    • Run the following command to deploy the smart contract to the Delphinet testnet using Taquito:

        npx taquito migrate  --network delphinet --provider https://delphinet.smartpy.io --wallet <your_wallet_address> --code tokenContract.tz --init "sp.to_string({})" --burn-cap 5
      • Replace <your_wallet_address> with your testnet wallet address

.

Section 4: Interacting with the Smart Contract and Testing

  1. Implement the User Interface:

    • Design and build an HTML/CSS/JavaScript frontend for your smart contract interaction.

    • Include functionalities such as token balance display, transfer input fields, and buttons for transferring tokens.

  2. Connect to the Smart Contract:

    • Use Taquito's JavaScript library to establish a connection between your frontend and the deployed smart contract.

    • Set up a connection to the Tezos network using the following code:

        const { Tezos } = require('@taquito/taquito');

  Tezos.setProvider({ rpc: 'https://delphinet.smartpy.io' });

  3. Implement Token Transfer:

    • Write JavaScript functions that call the appropriate smart contract methods to transfer tokens between different accounts.

    • Use Taquito's JavaScript library to interact with the smart contract. Here's an example:

        async function transferTokens() {
    const contract = await Tezos.contract.at('<contract_address>');
    const operation = await contract.methods.transfer({ sender: '<sender_address>', recipient: '<recipient_address>', amount: 100 }).send();
    await operation.confirmation();
    console.log('Tokens transferred successfully!');
  }

  4. Testing the Smart Contract:

    • Use the provided test function in the SmartPy code to execute tests.

    • Run the following command to execute the tests:

        npx sp-test tokenContract.py

Conclusion:

Congratulations! You have successfully created and deployed a Tezos smart contract with the FA 1.2 token standard. You've learned how to set up a Tezos project, write the smart contract using SmartPy, compile it, deploy it to the Tezos blockchain, interact with the smart contract through a user interface, and test the smart contract. Keep exploring and experimenting with Tezos to build decentralized applications on this powerful blockchain platform.

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