Blocky guides you through Ledger Land. Standing in the way: Double-Spend Dan — every mistake this lane teaches you to avoid. Blocks, consensus, Bitcoin, Ethereum, wallets, DeFi and NFTs — the whole on-chain universe from zero.
All 90 lessons below are free, need no signup, and each one opens as a comic issue with a live try-it sandbox, a task list that pays XP, and a narrator that reads it aloud. Progress is stored in your own browser — nothing is uploaded anywhere.