Learning Ledger
Use a hardware wallet — entirely from code. Walks step by step from the threat model that justifies hardware wallets, through the byte-level Ledger protocol (APDUs, BIP32 paths, RLP, EIP-712, Solana messages), to a capstone where you build a multi-chain signer module that talks to a Ledger across Bitcoin, Ethereum, and Solana. Even mix of readings, code-with-tests challenges, and quizzes — no device required to follow along; every exercise is a pure-function implementation of the protocol primitive the Ledger SDK uses internally.
- TypeScript
- 69 lessons
- ~14 hours
- Free
- by Fishbones
Learn TypeScript for free on Libre Academy with the Learning Ledger course: 69 interactive lessons you complete by writing real code in a built-in editor, graded instantly by hidden tests. No paywall, no sign-up — it runs in your browser and the free desktop app.
What you get
- Hands-on lessons with a real editor and instant, test-graded feedback.
- Free and open source — no account required to start.
- Runs in your browser, and offline in the free desktop app.
- TypeScript runs in your browser.
What's inside
- What's a Wallet?
- Connecting to Ledger
- APDUs
- BIP32 Derivation Paths
- BIP44 + Coin Types
- Public Keys + Addresses
- Bitcoin on Ledger
- Ethereum on Ledger
- Personal Sign + EIP-712
- Solana on Ledger
- Smart Contract Calls
- Error Handling
- Multi-Chain Accounts
- Security Model
- Capstone — Multi-Chain Signer