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merged_docs/all_merged.md

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merged_docs/essentials_merged.md

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scraped_docs/cadence_lang_org_docs/docs_language.md

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# Source: https://cadence-lang.org/docs/language/
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# Source: https://cadence-lang.org/docs/language
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The Cadence Programming Language | Cadence
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scraped_docs/developers_flow_com/blockchain_development_tutorials_cadence_getting_started_building_a_frontend_app.md

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On this page
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# Building a Frontend App
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# Building a frontend app
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This tutorial builds on the `Counter` contract you deployed in [Cadence Environment Setup](/blockchain-development-tutorials/cadence/getting-started/cadence-environment-setup) and [Smart Contract Interaction](/blockchain-development-tutorials/cadence/getting-started/smart-contract-interaction). It shows you how to create a simple `Next.js` frontend that interacts with the `Counter` smart contract deployed on your local Flow emulator. Instead of using FCL directly, you'll leverage [**@onflow/react-sdk**](/build/tools/react-sdk) to simplify authentication, querying, transactions, and to display real-time transaction status updates using convenient React hooks.
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[Edit this page](https://github.com/onflow/docs/tree/main/docs/blockchain-development-tutorials/cadence/getting-started/building-a-frontend-app.md)
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Last updated on **Oct 30, 2025** by **cshannon1218**
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Last updated on **Nov 14, 2025** by **0xLisanAlGaib**
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scraped_docs/developers_flow_com/blockchain_development_tutorials_cadence_getting_started_production_deployment.md

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On this page
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# Production Deployment
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# Production deployment
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You've developed locally with the emulator, integrated external dependencies, built sophisticated transactions, implemented comprehensive testing, and created a frontend interface. Now it's time to take your application live and deploy it to Flow's public networks.
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[Edit this page](https://github.com/onflow/docs/tree/main/docs/blockchain-development-tutorials/cadence/getting-started/production-deployment.md)
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Last updated on **Oct 30, 2025** by **cshannon1218**
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Last updated on **Nov 14, 2025** by **0xLisanAlGaib**
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scraped_docs/developers_flow_com/blockchain_development_tutorials_cross_vm_apps_batched_evm_transactions.md

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scraped_docs/developers_flow_com/blockchain_development_tutorials_evm_development_tools_foundry.md

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# Using Foundry with Flow
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Foundry is a suite of development tools that simplifies the process of developing and deploying Solidity contracts to EVM networks. This guide will walk you through the process of deploying a Solidity contract to Flow EVM using the Foundry development toolchain. You can check out the official Foundry docs [here](https://book.getfoundry.sh/).
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Foundry is a suite of development tools that simplifies the process to develop and deploy Solidity contracts to EVM networks. This guide will walk you through thow to deploy a Solidity contract to Flow EVM with the Foundry development toolchain. You can check out the official Foundry docs [here](https://book.getfoundry.sh/).
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In this guide, we'll deploy an ERC-20 token contract to Flow EVM using Foundry. We'll cover:
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* Developing and testing a basic ERC-20 contract
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* Deploying the contract to Flow EVM using Foundry tools
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* Querying Testnet state
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* Mutating Testnet state by sending transactions
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* How to develop and test a basic ERC-20 contract
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* Deploy the contract to Flow EVM with Foundry tools
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* How to query the Testnet state
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* How to mutate Testnet state by sending transactions
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## Overview[](#overview "Direct link to Overview")
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--rpc-url https://testnet.evm.nodes.onflow.org`
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2. Use the `--legacy` flag to disable [EIP-1559](https://eips.ethereum.org/EIPS/eip-1559) style transactions. Flow will support EIP-1559 soon and this flag won't be needed.
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2. Use the `--legacy` flag to turn off [EIP-1559](https://eips.ethereum.org/EIPS/eip-1559) style transactions. Flow will support EIP-1559 soon and this flag won't be needed.
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As an example, we'll show you how to deploy a fungible token contract to Flow EVM using Foundry. You will see how the above flags are used in practice.
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As an example, we'll show you how to deploy a fungible token contract to Flow EVM with Foundry. You will see how the above flags are used in practice.
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## Example: Deploying an ERC-20 Token Contract to Flow EVM[](#example-deploying-an-erc-20-token-contract-to-flow-evm "Direct link to Example: Deploying an ERC-20 Token Contract to Flow EVM")
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ERC-20 tokens are the most common type of tokens on Ethereum. We'll use [OpenZeppelin](https://www.openzeppelin.com/) starter templates with Foundry on Flow Testnet to deploy our own token called `MyToken`.
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### Installation[](#installation "Direct link to Installation")
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The best way to install Foundry, is to use the `foundryup` CLI tool. You can get it using the following command:
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The best way to install Foundry, is to use the `foundryup` CLI tool. You can get it with the following command:
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Check out the official [Installation](https://book.getfoundry.sh/getting-started/installation) guide for more information about different platforms or installing specific versions.
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### Wallet Setup[](#wallet-setup "Direct link to Wallet Setup")
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### Wallet setup[](#wallet-setup "Direct link to Wallet setup")
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We first need to generate a key pair for our EVM account. We can do this using the `cast` tool:
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cast balance --ether --rpc-url https://testnet.evm.nodes.onflow.org $YOUR_ADDRESS`
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### Project Setup[](#project-setup "Direct link to Project Setup")
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### Project setup[](#project-setup "Direct link to Project setup")
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First, create a new directory for your project:
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The tests should pass.
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### Writing the ERC-20 Token Contract[](#writing-the-erc-20-token-contract "Direct link to Writing the ERC-20 Token Contract")
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### Write the ERC-20 token contract[](#write-the-erc-20-token-contract "Direct link to Write the ERC-20 token contract")
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We'll use the OpenZeppelin ERC-20 contract template. We can start by adding OpenZeppelin to our project:
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We'll use the OpenZeppelin ERC-20 contract template. To start, we'll add OpenZeppelin to our project:
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The above is a basic ERC-20 token with the name `MyToken` and symbol `MyT`. It also mints the specified amount of tokens to the contract deployer. The amount is passed as a constructor argument during deployment.
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Before compiling, we also need to update the test file.
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Before we comnpile, we also need to update the test file.
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### Testing[](#testing "Direct link to Testing")
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}`
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You can now make sure everything is okay by compiling the contracts:
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To make sure everything is okay, compile the contracts:
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They should all succeed.
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### Deploying to Flow Testnet[](#deploying-to-flow-testnet "Direct link to Deploying to Flow Testnet")
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### Deploy to Flow Testnet[](#deploy-to-flow-testnet "Direct link to Deploy to Flow Testnet")
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We can now deploy `MyToken` using the `forge create` command. We need to provide the RPC URL, private key from a funded account using the faucet, and constructor arguments that is the initial mint amount in this case. We need to use the `--legacy` flag to disable EIP-1559 style transactions. Replace `$DEPLOYER_PRIVATE_KEY` with the private key of the account you created earlier:
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We can now deploy `MyToken` with the `forge create` command. We need to provide the RPC URL, private key from a funded account with the faucet, and constructor arguments that is the initial mint amount in this case. We need to use the `--legacy` flag to turn off EIP-1559 style transactions. Replace `$DEPLOYER_PRIVATE_KEY` with the private key of the account you created earlier:
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The above will print the deployed contract address. We'll use it in the next section to interact with the contract.
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### Verifying a Smart Contract[](#verifying-a-smart-contract "Direct link to Verifying a Smart Contract")
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### Verify a smart contract[](#verify-a-smart-contract "Direct link to Verify a smart contract")
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Once deployed, you can verify the contract so that others can see the source code and interact with it from Flow's block explorer. You can use the [`forge verify-contract`](https://book.getfoundry.sh/reference/forge/forge-verify-contract) command:
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After you deploy the contract, you can verify it so that others can see the source code and interact with it from Flow's block explorer. You can use the [`forge verify-contract`](https://book.getfoundry.sh/reference/forge/forge-verify-contract) command:
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When verifying a Mainnet contract, be sure to use the Mainnet [RPC](/build/evm/networks) and block explorer URLs.
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When you verify a Mainnet contract, be sure to use the Mainnet [RPC](/build/evm/networks) and block explorer URLs.
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### Querying Testnet State[](#querying-testnet-state "Direct link to Querying Testnet State")
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### Query Testnet state[](#query-testnet-state "Direct link to Query Testnet state")
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Based on the given constructor arguments, the deployer should own `42,000,000 MyT`. We can check the `MyToken` balance of the contract owner. Replace `$DEPLOYED_MYTOKEN_ADDRESS` with the address of the deployed contract and `$DEPLOYER_ADDRESS` with the address of the account you funded earlier:
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This should return the amount specified during deployment. We can also call the associated function directly in the contract:
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This will return the amount specified during deployment. We can also call the associated function directly in the contract:
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Let's create a second account and move some tokens using a transaction. You can use `cast wallet new` to create a new test account. You don't need to fund it to receive tokens. Replace `$NEW_ADDRESS` with the address of the new account:
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Let's create a second account and move some tokens with a transaction. You can use `cast wallet new` to create a new test account. You don't need to fund it to receive tokens. Replace `$NEW_ADDRESS` with the address of the new account:
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The deployer will also own fewer tokens now:
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[Edit this page](https://github.com/onflow/docs/tree/main/docs/blockchain-development-tutorials/evm/development-tools/foundry.md)
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Last updated on **Aug 26, 2025** by **Felipe Cevallos**
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Last updated on **Nov 12, 2025** by **cshannon1218**
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* [Overview](#overview)* [Example: Deploying an ERC-20 Token Contract to Flow EVM](#example-deploying-an-erc-20-token-contract-to-flow-evm)
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+ [Installation](#installation)+ [Wallet Setup](#wallet-setup)+ [Project Setup](#project-setup)+ [Writing the ERC-20 Token Contract](#writing-the-erc-20-token-contract)+ [Testing](#testing)+ [Deploying to Flow Testnet](#deploying-to-flow-testnet)+ [Verifying a Smart Contract](#verifying-a-smart-contract)+ [Querying Testnet State](#querying-testnet-state)+ [Sending Transactions](#sending-transactions)
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+ [Installation](#installation)+ [Wallet setup](#wallet-setup)+ [Project setup](#project-setup)+ [Write the ERC-20 token contract](#write-the-erc-20-token-contract)+ [Testing](#testing)+ [Deploy to Flow Testnet](#deploy-to-flow-testnet)+ [Verify a smart contract](#verify-a-smart-contract)+ [Query Testnet state](#query-testnet-state)+ [Sending Transactions](#sending-transactions)
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scraped_docs/developers_flow_com/blockchain_development_tutorials_evm_development_tools_hardhat.md

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# Flow Hardhat Guide
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Hardhat is an Ethereum development tool designed to facilitate the deployment, testing, and debugging of smart contracts. It provides a streamlined experience for developers working with Solidity contracts.
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Hardhat is an Ethereum development tool designed to facilitate the deployment, testing, and debugging of Solidity smart contracts. It provides a streamlined experience for developers who work with with Solidity contracts.
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## Prerequisites[](#prerequisites "Direct link to Prerequisites")
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Node v18 or higher, available for [download here](https://nodejs.org/en/download).
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For those new to Hardhat, we recommend exploring the [official documentation](https://hardhat.org/tutorial/creating-a-new-hardhat-project) to get acquainted. The following instructions utilize `npm` to initialize a project and install dependencies:
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For those new to Hardhat, we recommend that you exploare the [official documentation](https://hardhat.org/tutorial/creating-a-new-hardhat-project) to get acquainted. The following instructions use `npm` to initialize a project and install dependencies:
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### Fund Your wallet[](#fund-your-wallet "Direct link to Fund Your wallet")
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To deploy smart contracts, ensure your wallet has **$FLOW**. To obtain funds, navigate to the Flow [Faucet](https://faucet.flow.com/fund-account) and enter your wallet address.
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## Deploying a Smart Contract with Hardhat[](#deploying-a-smart-contract-with-hardhat "Direct link to Deploying a Smart Contract with Hardhat")
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## Deploy a smart contract with Hardhat[](#deploy-a-smart-contract-with-hardhat "Direct link to Deploy a smart contract with Hardhat")
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This section guides you through the process of deploying smart contracts on the Flow network using Hardhat.
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This section guides you through the process of how to deploy smart contracts on the Flow network with Hardhat.
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To keep this example straightforward, we've included the account's private key directly in `hardhat.config.ts`. However, it is crucial to not commit private keys to your Git repository for security reasons. Instead, use environment variables to safely handle sensitive information.
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### Deploy HelloWorld smart contract[](#deploy-helloworld-smart-contract "Direct link to Deploy HelloWorld smart contract")
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## HelloWorld smart contract[](#helloworld-smart-contract "Direct link to HelloWorld smart contract")
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You can now search for your deployed contract on the [Flowscan block explorer](https://evm-testnet.flowscan.io/)!
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### Get HelloWorld Contract Greeting[](#get-helloworld-contract-greeting "Direct link to Get HelloWorld Contract Greeting")
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### Get HelloWorld contract greeting[](#get-helloworld-contract-greeting "Direct link to Get HelloWorld contract greeting")
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2. Paste contents of script above. Make sure to update the contract address with the one from deployment in an earlier step.
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### Update greeting on HelloWorld smart contract[](#update-greeting-on-helloworld-smart-contract "Direct link to Update greeting on HelloWorld smart contract")
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### Verify contract[](#verify-contract "Direct link to Verify contract")
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[Edit this page](https://github.com/onflow/docs/tree/main/docs/blockchain-development-tutorials/evm/development-tools/hardhat.md)
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Last updated on **Aug 26, 2025** by **Felipe Cevallos**
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* [Prerequisites](#prerequisites)
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+ [Node](#node)+ [Wallet](#wallet)+ [Fund Your Wallet](#fund-your-wallet)* [Deploying a Smart Contract with Hardhat](#deploying-a-smart-contract-with-hardhat)
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+ [Configuration](#configuration)+ [Deploying HelloWorld Smart Contract](#deploying-helloworld-smart-contract)* [HelloWorld Smart Contract](#helloworld-smart-contract)
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+ [Get HelloWorld Contract Greeting](#get-helloworld-contract-greeting)+ [Update Greeting on HelloWorld Smart Contract](#update-greeting-on-helloworld-smart-contract)+ [Verifying Contract](#verifying-contract)
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+ [Node](#node)+ [Wallet](#wallet)+ [Fund Your wallet](#fund-your-wallet)* [Deploy a smart contract with Hardhat](#deploy-a-smart-contract-with-hardhat)
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+ [Configuration](#configuration)+ [Deploy HelloWorld smart contract](#deploy-helloworld-smart-contract)* [HelloWorld smart contract](#helloworld-smart-contract)
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+ [Get HelloWorld contract greeting](#get-helloworld-contract-greeting)+ [Update greeting on HelloWorld smart contract](#update-greeting-on-helloworld-smart-contract)+ [Verify contract](#verify-contract)
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