πŸ“–
Web3 Encyclopedia
  • Welcome aboard!
  • Source
  • πŸ˜€Evolution from Web 1.0 to Web 3.0
    • Web 1.0 Web 2.0 Web 3.0
    • Key Features
    • Current Limitations
    • Future of Web 3.0
    • Learn: What Is Web3?
    • Learn: Will Every Brand Have a Web3 Strategy?
    • Learn: Big Ideas in 2023
    • Learn: The Web3 Paradox: Why Scaling Usage Alone Won't Lead to Mass Adoption?
    • Learn: Is Web3 A Marketing Buzz or Tech Revolution?
    • Learn: What is the relationship between blockchain and Web3?
    • Learn:Empowering Women in Web 3.0: The Role and Contributions of Women in Blockchain, DeFi, and dApp
    • Learn: Web 3.0 and the Future of E-Commerce
    • Learn: 12 ways ecosystem projects can attract more developers
    • Learn: How Web3 is Impacting Education?
    • Learn: Web3 And The Future Of Digital Advertising
    • Learn: Web3’s impact on personalization, trust and engagement
    • Learn: Web3-Powered Identity Management -- Unlocking the Benefits of Decentralization
    • Learn: Why Web2 companies fail in Web3 while others made it?
    • Learn: To Identify or Not in a Web3 World?
    • 🀫[Insider Series] McKinsey x Web3
    • TL;DR πŸ‘€
  • πŸ’²Blockchain Fundamentals
    • Why is Blockchain So Popular?
    • Introduction to Blockchain
    • Blockchain Misconceptions
    • Blockchain vs Bitcoin, Database, Cloud
    • Consensus Mechanism
    • Public and Private Keys
    • Hash Functions and Cryptography
    • Sharding
    • Types of Blockchains: PoW, PoS and Private
    • Understanding Cryptocurrency
    • Coins vs Tokens
    • Blockchain Trilemma
    • Legality
    • Learn : Google’s Cloud Based Blockchain Node Service
    • Learn: How Blockchain, Digital assets, and Web3 Unlock Financial Inclusion Globally
    • Learn: Will Chinese-Made Crypto Soar Higher?
    • Learn: What Does MiCA Mean for Crypto in Europe?
    • Learn: Unraveling the Intricacies of Blockchain Forensics and Asset Tracking
    • Learn: Promising blockchain use cases in healthcare industry
    • Learn: The Role of Blockchain in Authenticating and Provenance Art
    • Learn: Blockchain-Based Digital Identity: Benefits, Risks, and Implementation Challenges
    • Learn: The Future of Energy Supply Chains
    • Learn: Revolutionizing smart contracts and cryptocurrency
    • Learn: Nigeria goes blockchain
    • Learn: A Game Changer for Online Gaming?
    • Learn: Is blockchain technology ready for high-storage applications?
    • Learn: Will Blockchain Technology Mark a Turning Point in Fraud Prevention?
    • Learn: Why ZK-rollups need data availability?
    • Learn: How will generative AI disrupt blockchain?
    • Learn: A New Blockchain for Generative AI?
    • TL;DR πŸ‘€
  • 🏟️Web3 Utilities
    • Decentralized Applications (dApps)
    • Cross-chain Bridges
    • DAO
    • Artificial Intelligence
    • Learn: Is Community-building Essential for Web3 Startups?
    • Learn: β€˜Decentralization Theater’
    • Learn: Crypto and AI- A yay or nay combination?
    • Learn: Dissecting the DAO
    • Learn: What is motivating Lido DAO to rise?
    • Learn: How to Turn Your Community Into a DAO?
    • Learn: The Key to Decentralized Decision Making
    • Learn: How Web 3.0 can disrupt the supply chain industry?
    • TL;DR πŸ‘€
  • πŸͺ™Bitcoin
    • What is Bitcoin
    • Bitcoin's Blockchain Technology
    • UTXO Model and Transaction Fees
    • Bitcoin Mining and Mempool
    • Learn: What is bitcoin mining?
    • What are Hard Forks and Soft Forks
    • What is SegWit and the Lightning Network
    • Bitcoin Ecosystem
    • Can Bitcoin be Destroyed? Game Theory and Network Attacks
    • Learn: Crypto token supplies explained
    • Learn: What is crypto tax-loss harvesting, and how does it work?
    • Learn: Can Crypto Go Green? How to Invest in Eco-Friendly Cryptocurrencies
    • Learn: Why Did FTX Collapse? Here’s What to Know.
    • Learn: How Sam Bankman-Fried swindled $8 billion in customer money?
    • Learn: How much is Bitcoin worth today?
    • Learn: The Costs of Running a Bitcoin Node In Nigeria
    • Learn: Has 2022 Left Any Crypto Positives?
    • Learn: How Crypto Exchanges Can Be Free of Risk?
    • Learn: Greed, Lies and FTX: Is Crypto a Force for Good or Evil?
    • Learn: Is Crypto a Cultural Movement?
    • Learn: What are the consequences of crypto’s ongoing regulatory process?
    • Learn: Beyond the Crash and Embracing NFTs?
    • Learn: Understanding crypto bag holders and their mindset
    • Learn: Inscriptions: Just A Fad, Or A Real Threat To Bitcoin Becoming Decentralized Money?
    • Learn: How Bitcoin Ordinals Can Change the Future Of Mining?
    • Learn: What is a supernet?
    • Learn: Bitcoin Miners Celebrate 10 Years Since First ASIC, What Changed Since Then?
    • Learn: Bill Vs. CBDC – Why This US Congressman Wants To Block The Fed From Issuing A Digital Dollar?
    • Learn: Why Bitcoin Will Blow People’s Minds In 2025?
    • Learn: How the Howey Test Sheds Light on Cryptocurrency's Regulatory Gray Area
    • Learn: Cryptocurrency vs AI: A Complex Debate
    • Learn: Where the U.S. Government Went Wrong in Regulating Crypto?
    • Learn: The Nostr Privacy Paradox
    • Learn: Do algorithmic stablecoins have a future as centralized coins are under scrutiny?
    • Learn: Is Bitcoin Set To Revolutionize The Financial World With Its Superior Purchasing Power?
    • Learn: What is Shibarium, and what does it mean for Shiba Inu?
    • Learn: What is a crypto dusting attack?
    • Learn: Is the Adoption of Central Bank Digital Currencies (CBDCs) the Future?
    • Learn: How Artificial Intelligence Could Revolutionize Crypto?
    • Learn: What’s next for EU’s crypto industry as European Parliament passes MiCA?
    • Learn: Why the EU Has MiCA and the U.S. Has Securities Law Confusion?
    • Learn: Six New Projects Looking to Mitigate Bitcoin Mining’s Energy Footprint
    • Learn: Who on Crypto Twitter chose not to pay for a blue checkmark?
    • Learn: What is the wash-sale rule in Crypto?
    • Learn: What is Pepecoin and can it flip memecoins Dogecoin and Shiba Inu?
    • Learn: Can you recover stolen Bitcoin from crypto scams?
    • Learn: What the β€˜anti-mining bill’ means for the crypto industry in Texas?
    • Learn: Does the US have a crypto β€˜tax loophole’ problem?
    • Learn: How users can stay protected?
    • Learn: How Crypto Revolutionize Cheaper and Faster Transactions?
    • Learn: Can NFTs and CFDs be BFFs?
    • Learn: A PR expert’s tips for memecoin projects
    • Learn: Why politicians aren't convinced about the Digital Euro?
    • Learn: How A 90-Year Old TA Theory Predicted The Sudden Bitcoin Boom?
    • Learn: Social Trading Platforms and CFDs: A New Paradigm in Investment
    • Learn: How could the Chinese economic crisis impact Bitcoin and crypto?
    • Learn: How do they compare: Bitcoin IRA vs. traditional IRA?
    • Learn: Why Tokenized Assets Are Safer During a Banking Crisis?
    • TL;DR πŸ‘€
  • πŸ›’οΈEthereum
    • Bitcoin vs Ethereum
    • What can Ethereum do?
    • What is Ether (ETH)?
    • What's Unique About ETH?
    • What are Smart Contracts?
    • Energy Consumption?
    • Ethereum Virtual Machine (EVM)
    • Pros & Cons of Smart Contracts
    • Decentralized Applications (dApps)
    • Ethereum Token Standards (ERC-20, ERC-721 and ERC-1155)
    • Evolution of Ethereum
    • How to Get Your First Ethereum
    • Learn: Next Ethereum Upgrade β€” Shanghai Upgrade
    • Learn: Tipping Scale for Crypto Adoption: Usability vs. Accessibility
    • Learn: Major Publicly Traded U.S. Bitcoin Miner Files For Chapter 11 – Impact On The Market?
    • Learn: 5 altcoin projects that made a real difference in 2022
    • Learn: How Tether Can Be a More Stable Stablecoin?
    • Learn: Are the Ethereum Killers Still Deadly?
    • Learn: What Ethereum Tech Trends Are Weathering the Bear Market?
    • Learn: How Ethereum’s token burns are making it a deflationary cryptocurrency?
    • Learn: A few things to know about Ethereum's Shanghai Upgrade
    • Learn: The Role of Enterprise Ethereum
    • Learn: Understanding Layer 2 Scaling Solutions for the Ethereum Network
    • Learn: The Battle of Giants: Bitcoin vs Ethereum
    • Learn: Cryptography, Smart Contracts and Distributed Networks
    • Learn: The Memecoin Grift and How It Threatens Ethereum Culture
    • Learn: What Is Ethereum’s β€˜Data Availability' Problem, and Why Does It Matter?
    • TL;DR πŸ‘€
  • πŸ‘›Wallet
    • What is a Blockchain Wallet?
    • Hardware / Software Wallet
    • How to Get Your First Cryptocurrency
    • Setting up Metamask Wallet
    • Learn: How to connect the Avalanche network to MetaMask?
    • Learn: How to pass on your crypto when you die?
    • Learn: What are hierarchical deterministic (HD) crypto wallets?
    • Learn: Pros and Cons of Digital Wallets
    • Learn : How Web 3.0 Wallets Are Redefining Digital Asset Security?
    • Learn: Open source: Buzzword or real security for crypto wallets?
    • TL;DR πŸ‘€
  • πŸŒ•New & Rising Protocols
    • Binance
    • NEAR
    • Solana
    • Fantom
    • Polygon
    • Cardano
    • Polkadot
    • Cosmos
    • Harmony
    • Cronos
    • Optimism
    • Terra
    • Who Will Win the L1 Wars?
    • Learn: New Layer 1 Blockchains Are Expanding the DeFi Ecosystem But No Eth Killers Yet
    • Learn: Is an Increased Focus on Layer-2 Scaling and ZK Technology Justified?
    • Learn: What Are the Stakes in the SEC vs. Ripple Case?
    • Learn: What is The Graph, and how does it work?
    • TL;DR πŸ‘€
  • πŸ“ˆDecentralized Finance (DeFi)
    • CEX vs DEX
    • CeFi vs DeFi
    • Algorithmic Stablecoins
    • Airdrop
    • Liquidity Pool
    • Impermanent Loss
    • Swapping
    • Wrapped Token
    • Arbitrage Opportunities
    • Staking
    • Yield Farming
    • Total Value Locked (TVL)
    • Gas Fees
    • Lending & Borrowing
    • Useful Tools
    • Activity: Uniswap & Pancake Swap
    • Learn: Automated Market Makers (AMMs) in DeFi
    • Learn: Crypto Moving towards ESG: What Is Regenerative Finance (ReFi)
    • Learn: What Is dYdX? Understanding the Decentralized Crypto Exchange
    • Learn: It's A Wrap - DeFi in 2022
    • Learn: Why DeFi should expect more hacks this year?
    • Learn: The Security Challenges of DeFi
    • Learn: The Promising Future of Decentralized Social Media on Web 3.0
    • Learn: Can CBDCs, Tokenized Deposits, Stablecoins and DeFi Coexist?
    • Learn: The Increasing Popularity of DeFi and Its Potential to Disrupt Traditional Finance
    • Learn: The future of DeFi is ReFi
    • Learn: DeFi aggregation
    • TL;DR πŸ‘€
  • πŸ™ˆNon-Fungible Token (NFT)
    • What are NFTs?
    • Case Study
    • Storage
    • Who are the Players?
    • NFT Marketplace
    • NFT Useful Resources
    • Activity: Mint Your Own NFT
    • Learn: How You Can Prevent Hackers From Stealing Your NFTs?
    • Learn: What Is an NFT Floor Price?
    • Learn: Should Bored Ape buyers be legally entitled to refunds?
    • Learn: China’s view of NFTs different from rest of the world’s
    • Learn: NFTs IRL: How Digital Collectibles Are Forging Offline Experiences
    • Learn: How NFT Brands Can Cut Through The Noise
    • Learn: How Web3 disrupts the music sector?
    • Learn: Unlockable content in NFTs
    • Learn: Why Meta Matters in NFTs?
    • Learn: Should NFT Marketplaces Become Centralized?
    • Learn: HermΓ¨s vs. MetaBirkins: The NFT Case That Could Have Major Trademark and Artistic Consequence
    • Learn: What are phygital NFTs, and how do they work?
    • Learn: What is NFT ticketing and how does it work?
    • Learn: Why Solana NFT marketplace is seeing less active users?
    • Learn: NFTs and Intellectual Property
    • Learn: How AI Is Changing Artistic Creation and Challenging IP Laws?
    • Learn: The Future of NFTs: Exploring Dynamic NFTs and Their Versatile Use Cases
    • Learn: NFTs in the event and ticketing industry
    • Learn: What is NFT rarity, and how to calculate it?
    • Learn: What happens to your NFTs when you die?
    • Learn: Dogecoin-Like Spike in Milady NFTs After Elon Musk’s Tweet, But Will It Last?
    • Learn: What are NFT royalties, and how do they work?
    • Learn: How developers aim to store crypto inside NFTs?
    • Learn: Generative Art NFTs: What Are They & Why Are They So Popular?
    • TL;DR πŸ‘€
  • πŸ’—Metaverse
    • What is the Metaverse?
    • Metaverse Economy
    • Metaverse Companies
    • GameFi
    • Learn: Are We in the Metaverse Yet?
    • Learn: Can the Metaverse exist without blockchain?
    • Learn: Can the Metaverse Facilitate Sustainable Growth of Defi Systems?
    • Learn: What is the role of biometrics in the metaverse?
    • Learn: Can metaverse be the future court?
    • Learn: Metaverse Fashion Is on the Rise, but for Whom?
    • Learn: Sustainability in the Metaverse: Challenges and Opportunities
    • Learn: How To Build A Responsible Metaverse?
    • Learn: What is a VTuber, and how do you become one?
    • Learn: How proof-of-identity provides human experiences?
    • Learn: The β€œMetaverse” Next Frontier for Business: Impact And Challenges
    • Learn: The 5 Biggest Misconceptions About The Metaverse
    • Learn: Why culture and ownership are critical to the metaverse?
    • TL;DR πŸ‘€
  • πŸ‘ΎCareer in Web3 (coming soon)
    • Developers
    • Moderators
    • Community Managers
    • UI/ UX Designers
    • Digital Fashion Designers
  • 🌱Sustainability (Coming Soon)
    • Industry Effort
    • Co-author
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On this page
  • Introduction to smart contracts
  • What are contracts?
  • Smart contracts
  • Smart contract use cases
  1. Ethereum

What are Smart Contracts?

PreviousWhat's Unique About ETH?NextEnergy Consumption?

Last updated 2 years ago

Introduction to smart contracts

Smart contracts are the fundamental building blocks of . They are computer programs stored on the blockchain that allows us to convert traditional contracts into digital parallels. Smart contracts are very logical, following an 'if this, then that' structure. This means they behave exactly as programmed and cannot be changed.

Nick Szabo coined the term 'smart contract'. In 1994, he wrote and, in 1996, .

Nick Szabo envisioned a digital marketplace built on these automatic, cryptographically secure processes. A place where transactions and business functions can happen trustlessly β€” without intermediaries. Smart contracts on Ethereum put this vision into practice.

What are contracts?

You're probably thinking: 'I'm not a lawyer! Why would I care about contracts?' For most people, contracts bring to mind needlessly long terms and conditions agreements or boring legal documents.

Contracts are just agreements. That is, any form of agreement can be encapsulated within the conditions of a contract. Verbal agreements or pen-and-paper contracts are acceptable for many things, but they aren't without flaws.

Trust and contracts

One of the biggest problems with a traditional contract is the need for trusted individuals to follow through with the contract's outcomes.

Here is an example:

Alice and Bob are having a bicycle race. Let's say Alice bets Bob $10 that she will win the race. Bob is confident he'll be the winner and agrees to the bet. In the end, Alice finishes the race well ahead of Bob and is the clear winner. But Bob refuses to pay out on the bet, claiming Alice must have cheated.

This example illustrates the problem with any non-smart agreement. Even if the conditions of the agreement get met (i.e. you are the winner of the race), you must still trust another person to fulfill the agreement (i.e. payout on the bet).

Smart contracts

Smart contracts digitize agreements by turning the terms of an agreement into computer code that automatically executes when the contract terms are met.

A digital vending machine

A simple metaphor for a smart contract is a vending machine, which works somewhat similarly to a smart contract –– specific inputs guarantee predetermined outputs.

  • You select a product.

  • The vending machine returns the amount required to purchase the product.

  • You insert the correct amount.

  • The vending machine verifies you have inserted the correct amount.

  • The vending machine dispenses the product of choice.

The vending machine will only dispense your desired product after all requirements are met. If you don't select a product or insert enough money, the vending machine won't give out your product.

Automatic execution

One of the most significant benefits smart contracts have over regular contracts is that the outcome is automatically executed when the contract conditions are realized. There is no need to wait for a human to execute the result. In other words: smart contracts remove the need for trust.

For example, you could write a smart contract that holds funds in escrow for a child, allowing them to withdraw funds after a specific date. If they try to withdraw the funds before the specified date, the smart contract won't execute. Or, you could write a contract that automatically gives you a digital version of a car's title when you pay the dealer.

Predictable outcomes

The human factor is one of the biggest points of failure with traditional contracts. For example, two individual judges may interpret a traditional contract in different ways. Their interpretations could lead to different decisions getting made and disparate outcomes. Smart contracts remove the possibility of different interpretations. Instead, smart contracts execute precisely based on the conditions written within the contract's code. This precision means that given the same circumstances, the smart contract will produce the same result.

Public record

Smart contracts are also useful for audits and tracking. Since Ethereum smart contracts are on a public blockchain, anyone can instantly track asset transfers and other related information. You can check to see that someone sent money to your address, for example.

Privacy protection

Smart contracts can also protect our privacy. Since Ethereum is a pseudonymous network (your transactions are tied publicly to a unique cryptographic address, not your identity), you can protect your privacy from observers.

Visible terms

Finally, like contracts, you can check what's in a smart contract before you sign it (or otherwise interact with it). Better yet, public transparency of the terms in the contract means that anyone can scrutinize it.

Smart contract use cases

So, smart contracts are computer programs that live on the blockchain. They can execute automatically. You can track their transactions, predict how they act and even use them pseudonymously. That's cool. But what are they good for? Well, smart contracts can do essentially anything that other computer programs do.

They can perform computations, create currency, store data, mint NFTs, send communications and even generate graphics. Here are some popular, real-world examples:

πŸ›’οΈ
Stablecoins
Creating and distributing unique digital assets
An automatic, open currency exchange
Decentralized gaming
An insurance policy that pays out automatically
A standard that lets people create customized, interoperable currencies
Ethereum applications
an introduction to the concept
an exploration of what smart contracts could do