Blockchain

Blockchain notes — mostly Ethereum-flavoured: tokens, smart contracts, DeFi primitives, and the infrastructure around indexing and cross-chain. Built up while working on crypto-adjacent products; kept here as reference material to come back to.

Foundations

• EVM — the execution environment.
• Ethereum layers — L1, L2, rollups.
• Smart contracts, Solidity — how logic lives on-chain.
• Dapps — the application layer.
• DAO — on-chain governance.

Tokens

• Fungible token vs non-fungible token — the core distinction.
• ERC-20 — the fungible standard.
• ERC-721 and ERC-1155 — the NFT standards. See also NFT.
• Stablecoin — dollar-pegged tokens. USDC, USDT.
• Wrapped tokens — bridged representations of other assets.

DeFi

• DeFi — the umbrella.
• DEX — decentralized exchanges.
• AMM, liquidity pools — the automated market-maker model.
• Concrete DEXes: Uniswap, Curve, Balancer.
• Lending and stable issuance: MakerDAO, CDP.
• Advanced mechanics: Flash loans, MEV, TVL.

Infrastructure

• Blockchain indexers — indexing on-chain state for apps.
• Cross-chain — bridges and interop.