The unit
The scarce digital value being transferred. Prices are often easier to express in sats: 10,000 sats is 0.0001 BTC.
No finance degree required
Bitcoin, explained like a good neighbor would.
No Wall Street vocabulary. No hype. We start at the kitchen table and build a common-sense picture of wallets, transactions, nodes, mining, and safe self-custody.
✓ Built for everyday Americans and German speakers
Three jobs, one shared rulebook
Bitcoin in one glance
₿Bitcoin rules + public ledger
₿ WalletCreates and signs payment instructions
▤ NodeChecks every rule for itself
◎ MinerCompetes to propose the next block
21 millionmaximum bitcoin that can ever exist
100 millionsatoshis (sats) in one bitcoin
~10 minutestarget average between new blocks
▤ The first truth
Bitcoin is not a company and has no customer-service desk. It is open software, a network of independent computers, and a scarce digital unit people can send directly.
Your learning road map
Eight short lessons. One clear picture.
Read straight through or jump to what you need. Every section answers one practical question.
01›02›03›04›05›06›07›08›
What is Bitcoin?
Separate the network, the ledger, and the money.
How a payment moves
Follow one transaction from wallet to confirmation.
Wallets and keys
Learn what a wallet actually holds—and what it does not.
Jade Plus
Use a real hardware wallet as our hands-on example.
Full nodes
Meet the independent rule checkers of Bitcoin.
Mining
Understand proof of work without the math fog.
Stay safe
Avoid the mistakes that cost real money.
Check your knowledge
Five questions to lock in the essentials.
Lesson 01 · The basics
So what is Bitcoin, really?
Think of a county land-record book that thousands of independent offices keep in sync. Nobody can quietly erase an old deed, and every office checks new entries against the same public rules.
The ledger
A time-ordered history of valid transactions, grouped into blocks and copied by full nodes.
The network
Wallets request payments, nodes enforce rules, and miners compete to add the next valid block.
✕ Bitcoin is not…
— a bank account held by Bitcoin, Inc.
— a file stored inside your hardware wallet
— anonymous by default—its ledger is public
— a promise that its dollar or euro price will rise
✓ Bitcoin is…
— a public set of rules anyone can inspect
— a bearer asset: control follows valid keys
— permissionless to use, but not free of laws or taxes
— irreversible by design once a payment is confirmed
Lesson 02 · Follow the money
What happens when Alice pays Bob?
Tap each stop. A payment is a signed instruction, checked and relayed by nodes, then placed into a block by a miner.
Bob shares an address
Bob's wallet creates a new receiving address. It is safe to share, much like an invoice number—but Bob should verify it on a trusted screen.
Alice builds the payment
Her wallet selects earlier received chunks of bitcoin called UTXOs, names Bob's amount, creates change back to Alice, and chooses a fee.
Alice signs
Her private key creates a digital signature. A Jade Plus can do this inside the hardware device so the private key never needs to enter the phone or computer.
Nodes inspect it
Independent nodes check the signature, confirm the coins exist, and make sure they have not already been spent. Valid transactions are relayed.
A miner proposes a block
Miners choose transactions, perform proof of work, and one eventually broadcasts a candidate block containing Alice's payment.
Nodes decide if it counts
Every full node checks the entire block. If it follows the rules, nodes accept it and later blocks add confirmations. Invalid blocks are rejected—even if a miner spent energy making them.
Miners propose the next page. Full nodes decide whether that page follows the rulebook. Wallets do not need to trust a miner's word.
Why did my wallet create ‘change’?
Bitcoin works more like cash than a checking-account balance. If you spend a $20 bill on a $6 item, the whole bill moves and you receive $14 back. A wallet does the same with UTXOs, usually sending change to a fresh address you control.
Lesson 03 · Wallets and keys
Your wallet does not hold bitcoin.
The bitcoin stays recorded on the shared ledger. A wallet manages the secret keys that authorize spending. Think key ring, not coin purse.
Hot wallet
Convenient for smaller, everyday amounts. Because it touches an internet-connected device, it has a larger attack surface.
Hardware wallet
Designed to sign transactions without exposing private keys to the connected phone or computer. Better suited to meaningful savings.
Watch-only wallet
Uses public wallet information to show balances and create unsigned payments. It cannot sign without the hardware wallet.
Address
Share thisA destination for receiving bitcoin. Verify it before use.
Public key data
Share selectivelyLets software derive or monitor addresses, but sharing extended public keys reduces privacy.
Private key
Never shareThe signing authority for specific bitcoin.
Recovery phrase
Never digitize or shareThe master backup that can rebuild the wallet's private keys.
⚠ Anyone who learns your recovery words can take the bitcoin. There is no undo button.
Lesson 04 · Hardware wallet workshop
Meet the Blockstream Jade Plus
We use Jade Plus as our real-world example. It is a fully open-source, Bitcoin-focused hardware wallet with a color screen, camera, USB-C, Bluetooth, and offline transfer options. The important lesson applies to every sound hardware-wallet setup: keep keys off the everyday computer and verify important details on the trusted device.
✓ Camera + QR signing✓ USB-C and Bluetooth✓ SD card / USB drive✓ 12- or 24-word recovery✓ Genuine Check✓ Open-source design
JADE PLUS
A careful first setup
Buy from a trusted source
Use Blockstream or a clearly authorized seller. Inspect the packaging and run the device's Genuine Check before putting money at risk.
Install only official software
Use Blockstream's official app or another compatible wallet from its official website. Confirm the web address carefully—ads and fake downloads are common.
Create a new wallet on Jade
Let the device generate a fresh 12- or 24-word recovery phrase. Do not accept words supplied in the box, by a seller, or by a helper.
Back up the words offline
Write them clearly on paper or a purpose-built metal backup. Never photograph them, email them, put them in cloud storage, or type them into a website.
Verify the backup
Use Jade's built-in verification process. A backup you cannot read correctly is not a backup.
Connect—or stay air-gapped
Beginners may use USB or Bluetooth. For an air-gapped Bitcoin workflow, Jade Plus and the companion app can exchange transaction data with QR codes.
Receive a tiny test amount
Generate an address in the companion app and verify that same address on Jade's screen before sharing it. Start small.
Send part of it back
Review the destination and amount on Jade itself, sign, broadcast, and wait for confirmation. Learn the full loop before moving meaningful savings.
▦ What ‘air-gapped’ actually means
⚠ Jade Plus QR mode supports Bitcoin transactions. Blockstream currently says Liquid transactions require USB or Bluetooth. Always check current official instructions before setup.
⚿ The device is replaceable. The backup is the treasure.
If Jade is lost or broken, a compatible wallet can recover the funds from the recovery phrase. If both device access and the recovery backup are lost, nobody can reset the account for you.
✓ Save advanced features for later
Passphrases, SeedQR, multisignature, duress PINs, and stateless signing can improve a carefully designed setup—but they also create new ways to lock yourself out. Master a simple backup and small test transaction first.
Lessons 05–06 · The network
Nodes judge. Miners compete.
People often blend nodes and miners together. They are different jobs, and that separation is one of Bitcoin's strongest checks and balances.
◎ Full node
The independent inspector- ✓ Downloads and validates Bitcoin's history
- ✓ Checks transactions and blocks against the rules
- ✓ Relays valid data to other peers
- ✓ Lets your wallet ask your own computer instead of a company's server
- ✓ Does not earn bitcoin merely for running
⚙ Miner
The block proposer- ✓ Builds a candidate block from waiting transactions
- ✓ Uses specialized ASIC machines to perform proof of work
- ✓ Competes in a probability contest—not a puzzle solved by cleverness
- ✓ May earn the block subsidy and transaction fees
- ✓ Cannot force full nodes to accept an invalid block
?
Who has the final word?
Your full node has the final word about what you accept. Miners order valid transactions; they do not rewrite the rules your node enforces.
Mining without the fog
Imagine a fairground raffle where every ticket requires real electricity to print. Miners make trillions of guesses. The first valid guess earns the right to propose one page of transactions. Everyone else can check that winning ticket almost instantly. This costly-to-create, easy-to-check proof helps make old history extremely expensive to rewrite.
Why blocks do not arrive all at once
The network adjusts mining difficulty every 2,016 blocks so blocks continue to arrive about every ten minutes on average, even as total mining power changes. Ten minutes is a target average: one block may take seconds and another may take much longer.
Running a node with rural internet
A full node can run from home, but the first sync transfers a very large blockchain. A pruned node still verifies the full history, then discards older block files to save disk space. On metered, satellite, or slow connections, plan the initial download carefully, set bandwidth limits, and check current Bitcoin Core requirements before starting.
Lesson 07 · Protect yourself
Slow is smooth. Smooth is safe.
Bitcoin removes the bank's permission, but it also removes the bank's reset button. Good habits matter more than fancy gear.
✕ Never do these
- Never tell anyone your recovery words—not even ‘support.’
- Never type the words into a phone, computer, website, or chat.
- Never send bitcoin because a caller says the IRS, police, utility, or family member demands it.
- Never trust a receiving address only because it appeared on your computer; verify it on Jade.
- Never rush because of a countdown, guaranteed return, romance, prize, or emergency story.
✓ Make these habits boring
- Start with a tiny test payment and complete a test send back.
- Read the amount, address, and fee before approving on the hardware screen.
- Keep two durable backups in separate, secure locations when your plan warrants it.
- Tell a trusted heir how to find instructions—without exposing the secret today.
- Keep records. Tax treatment differs between the United States, Germany, and local jurisdictions.
✓ A real helper can explain what to click. A thief asks for the words that control the money.
Confirmations in plain English
A payment first shown as ‘unconfirmed’ is waiting. After it enters a valid block it has one confirmation. Every valid block added afterward buries it deeper. For a small coffee purchase, a merchant may accept quickly; for a tractor, home, or business-sized payment, wait for stronger settlement and use professional guidance.
Private is not the same as anonymous
Bitcoin addresses do not display a legal name, but transactions are public and can often be linked through exchange records, address reuse, payment patterns, or careless sharing. Use a fresh receive address, avoid posting balances, and learn coin control and your own node before claiming strong privacy.
Lesson 08 · Check your knowledge
Can you explain it back?
Choose one answer for each question. The explanation matters more than the score.
Keep this handy
The kitchen-table glossary
- Address
- A public destination used to receive bitcoin. Use a fresh one when possible.
- Block
- A batch of valid transactions with proof of work, accepted after nodes verify it.
- Blockchain
- The ordered chain of accepted blocks.
- Confirmation
- Evidence that a transaction is in an accepted block; more blocks add depth.
- Fee rate
- What you offer miners for each unit of transaction data—not a percentage of the dollars sent.
- Mempool
- Each node's waiting room for valid, unconfirmed transactions.
- Private key
- Secret signing authority. It must stay secret.
- Recovery phrase
- Human-readable master backup for a wallet's keys.
- Satoshi / sat
- The smallest standard bitcoin unit: 100,000,000 sats = 1 BTC.
- UTXO
- A spendable chunk of bitcoin, similar to a bill or coin in your cash drawer.
₿✓
You now know more than the headlines teach.
The next safe move is not buying a large amount. It is explaining the system in your own words, setting up carefully, and practicing the full receive-and-send loop with an amount you can afford to lose while learning.
Review the Jade checklist ›