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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.

Often users will not need to know the application they're using is built using a blockchain. Ready to choose your stack? There are two types of nodes in an Ethereum network. They are as follows. Mining Node — These nodes are responsible for writing all the transactions that have occurred in the Ethereum network in the block. Ethereum Virtual Machine Node — These are the nodes in the Ethereum network in which Smart Contracts it is a type of contract between supporter and developer in which there are a set of rules based on which both the parties agree to interact with each other.

The agreement will be automatically executed when the pre-defined rules are met. By default, this node utilizes a port number for the purpose of communication among themselves. Component-2 : Ether — Ether is a type of cryptocurrency used in the Ethereum network just like a bitcoin is used in a blockchain network.

It is a peer-to-peer currency, similar to Bitcoin. It tracks and promotes each transaction in the network. It is the second-largest cryptocurrency in the world. The first one is Bitcoin. Other cryptocurrencies can be used to get ether tokens, but vice versa is not true. Ether is paid as a commission for any execution that affects the state in Ethereum. It is used in the Ethereum algorithm as an incentive for miners who connect blocks to the blockchain using a proof-of-work method.

It is the only currency that can be used to pay transaction costs, which go to miners as well. The block reward, as well as transaction fees, provide miners with an opportunity to keep the blockchain rising. Aside from paying for transactions, ether is often used to purchase gas, which is used to pay for the computation of any transaction on the Ethereum network. Component-3 : Gas — Gas is an internal currency of the Ethereum network.

We need gas to run applications on the Ethereum network, much as we need gas to run a vehicle. To complete every transaction on the Ethereum network, a consumer must first make a payment—send out ethers—and the intermediate monetary value is known as gas.