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Ethereum gradient

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Any application may integrate with deployed smart contracts to compose functionality, such as adding data feeds or to support token swaps. Additionally, anyone can deploy new smart contracts to Ethereum in order to add custom functionality to meet their application's needs. As a dapp developer, you'll need to write smart contracts only if you want to add custom functionality on the Ethereum blockchain. You may find you can achieve most or all of your project's needs by merely integrating with existing smart contracts, for instance if you want to support payments in stablecoins or enable decentralized exchange of tokens.

Level 3: Ethereum nodes In order for an application to interact with the Ethereum blockchain, it must connect to an Ethereum node. Ethereum nodes are computers running software - an Ethereum client. A client is an implementation of Ethereum that verifies all transactions in each block, keeping the network secure and the data accurate.

Ethereum nodes are the Ethereum blockchain. They collectively store the state of the Ethereum blockchain and reach consensus on transactions to mutate the blockchain state. By connecting your application to an Ethereum node via the JSON-RPC API , your application is able to read data from the blockchain such as user account balances as well as broadcast new transactions to the network such as transferring ETH between user accounts or executing functions of smart contracts.

Level 4: Ethereum client APIs Many convenience libraries built and maintained by Ethereum's open source community allow your applications to connect to and communicate with the Ethereum blockchain. If your user-facing application is a web app, you may choose to npm install a JavaScript API directly in your frontend. While these APIs are not a necessary piece of the stack, they abstract away much of the complexity of interacting directly with an Ethereum node.

They also provide utility functions e. Level 5: End-user applications At the top level of the stack are user-facing applications. These are the standard applications you regularly use and build today: primarily web and mobile apps. The way you develop these user interfaces remains essentially unchanged. Don't use it in production! Step 1: Compiling your contracts Compiling an Ethereum contract Just like with any other project, we'll first need to compile our Solidity into EVM bytecode.

Let's compile our ERC20 contract by running the following command: npx hardhat compile You should now see a new folder, artifacts, which has some JSON files in it. If you can see this folder you're ready to move onto the next section! Compiling an Optimistic Ethereum contract Compiling a contract for Optimistic Ethereum is pretty easy! We'll also have to add optimism to your list of networks within hardhat. You'll just need to add the --network optimism option to hardhat compile: npx hardhat --network optimism compile Yep, it's that easy.

You can verify that everything went well by looking for the artifacts-ovm and cache-ovm directories. Here, artifacts-ovm signifies that the contracts contained in this directory have been compiled for the OVM. Now let's move on to testing! Step 2: Testing your contracts Testing an Ethereum contract Alright, this step is pretty straightforward.

You'll probably want to test your contracts before you deploy them lol. Let's see how you'd do that with Hardhat for a standard Ethereum contract. Testing with Hardhat is easy. Let's run these tests with hardhat: npx hardhat test If everything is going as planned, you should see a bunch of green checkmarks. Testing an Optimistic Ethereum contract Woot! It's finally time to test our contract on top of Optimistic Ethereum.

But first we'll need to get a local version of Optimistic Ethereum node running Fortunately, we have some handy dandy tools that make it easy to spin up a local Optimistic Ethereum node! Since we're going to be using Docker, make sure that Docker is installed on your machine prior to moving on info on how to do that here. We recommend opening up a second terminal for this part. This way you'll be able to keep the Optimistic Ethereum node running so you can execute some contract tests.

Now we just need to download, build, and install our Optimistic Ethereum node by running the following commands. Please note that docker-compose build will take a while. We're working on improving this sorry! This also ensures that transactions are sent to our L2 node instead of hardhat's local L1 node.

Go ahead and run that command. You should see another set of passing tests.

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Ethereum: Key Milestones

Layer 2 is a collective term for solutions designed to help scale your application by handling transactions off the Ethereum Mainnet (layer 1) while taking advantage of the robust . Scaling Ethereum hackathon submission. Contribute to alkamid/scalingeth-gradient development by creating an account on GitHub. Download 8 Find Ethereum Gradient Vector Icons for commercial and personal use. Available for free or premium in line, flat, gradient, isometric, glyph, sticker & more design styles.