Bitcoin education for beginners and builders
A calm, hands-on course on how the blockchain actually works, and a toolkit of Bitcoin tools you'll keep using long after the last lesson.
One-time payment, lifetime access. Toolkit from €9/month after a 7-day free trial.
Short lessons that explain one thing at a time, in plain language.
Every lesson ends with something to poke at, so it sticks.
The toolkit stays useful long after you finish the course.
Whether you've never owned a sat or you already write code, HashedBlock meets you at your level and goes as deep as you want.
New to crypto
Plain-English lessons with friendly diagrams. Go from “what even is a blockchain?” to confidently setting up and protecting your own wallet.
Already technical
Skip ahead to the real mechanics: hashing, Merkle trees, UTXOs, script, key derivation and the mempool, with tools you can actually poke at.
Each module builds on the last. Work through at your own pace, and come back whenever you need a refresher.
The problem a blockchain solves, before any of the technology.
Why a tiny change scrambles everything, and why that matters.
How each block locks in the one before it, and what “immutable” really means.
Difficulty, nonces and why rewriting history is so expensive.
Public and private keys in plain language, then in detail.
What a wallet really holds, and how to back it up properly.
Inputs, outputs, change, and reading a real transaction.
How fees work, and how to avoid overpaying or getting stuck.
Payment channels, and how Bitcoin scales beyond the base layer.
Scams, phishing and the self-custody habits that protect you.
These are real SHA-256 hashes, worked out in your browser. Each block includes the hash of the one before it. Change an old block and see what gives you away.
Edit any block below and watch what happens to the chain.
The course gets you started. The toolkit is what you use day to day: checking an address before a payment, or digging into a transaction.
The one most people start with
Build a wallet one piece at a time. Generate a seed phrase, derive keys and addresses from it, and see exactly how each part connects to the next.
Try it free for 7 daysHash anything, build toy blocks, and try mining one yourself to feel how proof of work behaves.
Paste a raw transaction and see its inputs, outputs, fee and scripts, laid out in plain language.
See current fee levels and pick a sensible fee for how soon you need a payment to confirm.
Check an address before you send: its format, its network, and whether it looks the way it should.
Switch between bitcoin, sats and euros instantly. Small, but you’ll use it all the time.
New tools are added over time, and they’re included in the subscription.
Buy the course on its own, subscribe to the toolkit, or get both. Checkout is handled securely by Whop.
€49one time
Pay once, keep it forever.
€9per month
7 days free, then €9 a month. Cancel anytime.
None at all. The course starts from the very beginning. If you already know the basics, the deeper sections and the toolkit still give you plenty to dig into.
No. Everything is explained in plain language first. Technical learners get optional deep dives that go further into the details.
The course is a one-time €49 purchase that teaches you how Bitcoin works. The toolkit is a €9/month subscription to the practical tools you’ll keep using afterwards. You can get either one, or both.
You get the full toolkit free for 7 days. If you don’t cancel before the trial ends, your subscription continues at €9 a month.
No. HashedBlock is education only. We teach how the technology works so you can make your own informed decisions. We never tell you what to buy or sell.
Start with the first block. We’ll take it from there.