Blockchain Tokens Explained: ERC-20, ERC-721, ERC-1155 and Beyond
Blockchain tokens represent a paradigm shift in how we think about digital ownership and value transfer. Built primarily on Ethereum and other smart contract platforms, these tokens have enabled everything from decentralized finance (DeFi) to digital art marketplaces.
ERC-20: The Fungible Token Standard
ERC-20 is the most widely adopted token standard on Ethereum. It defines a common interface for fungible tokens - each token is identical to every other token of the same type. Key functions include transfer(), approve(), transferFrom(), balanceOf(), and totalSupply(). Popular ERC-20 tokens include USDT, USDC, UNI, and LINK.
ERC-721: Non-Fungible Tokens (NFTs)
ERC-721 introduced the concept of non-fungible tokens - each token has unique properties that distinguish it from all others. This standard revolutionized digital art, gaming items, and collectibles. Each NFT can represent ownership of a unique digital or physical asset, verified on the blockchain.
ERC-1155: Multi-Token Standard
ERC-1155 combines the best of both worlds, allowing a single contract to manage multiple token types - both fungible and non-fungible. This is particularly useful for gaming, where a single contract can manage currencies, equipment, and unique items efficiently, saving gas costs through batch transfers.
Other Notable Standards
- ERC-777: Advanced token standard with hooks for improved interoperability
- ERC-4626: Tokenized vault standard for DeFi yield-bearing assets
- ERC-1363: Payable tokens that trigger actions on transfer
- SRC-20: Bitcoin blockchain's equivalent token standard via Ordinals
Token Economics
Token economics (tokenomics) governs the supply, distribution, and utility of blockchain tokens. Key concepts include total supply, circulating supply, vesting schedules, staking mechanisms, and governance rights.
Conclusion
Blockchain tokens have transformed digital ownership and financial systems. Understanding the different token standards helps developers and investors navigate the rapidly evolving Web3 ecosystem.