Smart contracts are programs that run on the Ethereum blockchain and automatically execute agreements without the involvement of third parties. They provide security, transparency, and independence of transaction execution.
What is a smart contract?
Simply put, a smart contract is a code that is stored on the blockchain. It is triggered when certain conditions are met. Once deployed, the code becomes immutable, making it a reliable foundation for decentralized applications (dApps).
The term “smart contract” was first coined by cryptographer Nick Szabo in the 1990s, and its widespread use was made possible by the launch of Ethereum in 2015.
How are smart contracts created?
- Programming Language:
Solidity, a special language similar to JavaScript, is used to develop contracts.
- Compilation:
The source code is compiled into bytecode that is understood by the Ethereum Virtual Machine (EVM).
- Deployment:
The contract is deployed on the blockchain through a transaction. It is then given its own address on the network.
4.Interaction:
Any user or other application can send calls to the contract methods.
Where are smart contracts used?
- Finance: decentralized exchanges, lending without intermediaries (DeFi).
- NFT: creating and selling digital tokens.
- Gaming: game mechanics with real values (e.g. Axie Infinity).
- Voting: transparent and anonymous electronic voting.
- Logistics: real-time tracking of goods.
Benefits and risks
Benefits:
- Automation of processes
- Minimization of the risk of human error
- Transparency of execution
Risks:
- Bugs in code (e.g., bugs in DAO in 2016 resulted in millions of dollars lost)
- Inability to change a contract once it has been published
- Dependence on the cost of gas on the Ethereum network
Where should a beginner start?
- Learn the basics of Solidity on the CryptoZombies.io platform.
- Familiarize yourself with Truffle and Hardhat tools for developing and testing contracts.
- Try to deploy the first contract on a test network (e.g. Sepolia).
Bottom line
Smart contracts are the foundation for building new forms of digital interaction. By learning their principles, you will be able to create your own decentralized applications and participate in the development of Web3.