Bitcoin Libraries

Use modern libraries for keys, addresses, and transaction construction.

intermediate6 days

Public lesson — sign in to track progress on this roadmap.

Learning objectives

Choose appropriate libraries for JS and Rust stacks
Generate addresses and inspect transactions programmatically
Avoid common footguns when wrapping consensus logic

study // plan

Lessons are primers. Start with Step 1 (required reading) when present, then follow the numbered steps in the article. Depth comes from primary sources, labs, reflection, and evidence.

Research on Bitcoin Search

bitcoinjs-lib rust-bitcoin BDK Bitcoin Dev Kit

Step 1 // Required reading

Complete these before the numbered steps in the lesson body. Links are listed here once — not repeated below.

docsbitcoinjs-lib
JS stack - keys, addresses, and transaction construction.
docsrust-bitcoin
Rust stack - consensus types and serialization primitives.

Reflection prompts

Explain Bitcoin Libraries to a teammate without jargon - what problem does it solve?
What would break in production if you misunderstood Bitcoin Libraries?
Which BIP, book chapter, or Core doc is authoritative here, and what did you verify?

Lab // Network + address in a library

Complete Steps 2–3. In JS or Rust, generate a regtest address (or print network params) with a maintained library. Never use mainnet keys for the lab.

evidence required

Code snippet or terminal output showing a regtest address or network object
Which library and version you used
One sentence on why you would not hand-roll Bech32 / sighash

You should not hand-roll Base58, Bech32, or sighash code. Use maintained libraries that track consensus and address standards.

Complete Step 1 // Required reading in the study plan above (skim both READMEs; go deep on the stack you will use). This opens Development.

Step 2 — Core idea: pick a stack, pin versions

A one-character encoding bug can burn funds. Libraries encapsulate years of edge cases — version bytes, witness quirks, taproot tweaks.

Analogy: Power tools with safety guards. You still need skill, but you should not forge your own circular saw blade from scrap metal.

Need	JavaScript	Rust
Primitives	bitcoinjs-lib, @scure/btc-signer	rust-bitcoin
Wallet engine	often custom + indexers	BDK
secp256k1	noble / bitcoin-secp…	secp256k1 / libsecp

Loading diagram…

Apps compose libraries for keys, tx building, and signing workflows.

// Prefer well-reviewed packages; pin versions; read changelogs on upgrades
import * as bitcoin from "bitcoinjs-lib";
const network = bitcoin.networks.regtest;

# Rust sketch
cargo add bitcoin

Done when: You can name your primary library and what you still should not DIY.

Step 3 — Try it: address or network object (lab)

Generate a regtest address (or print network params) with your chosen library. Paste output or a short code snippet. Note library + version.

Common mistakes

Copy-pasting random npm snippets that use deprecated address APIs
Mixing mainnet and regtest network objects
Using non-audited “crypto helper” packages for key material

Done when: Lab evidence (output + library/version + DIY sentence) is complete.

Next lesson

Wallet Architecture — HD keys, watch-only vs signing, and backups.

Bitcoin Libraries

Learning objectives

Step 1 // Required reading

Reflection prompts

Lab // Network + address in a library

How to study this lesson

Step 2 — Core idea: pick a stack, pin versions

Step 3 — Try it: address or network object (lab)

Common mistakes

Next lesson

further reading

Bitcoin Libraries

Learning objectives

Step 1 // Required reading

Reflection prompts

Lab // Network + address in a library

How to study this lesson

Step 2 — Core idea: pick a stack, pin versions

Step 3 — Try it: address or network object (lab)

Common mistakes

Next lesson

further reading