What it really is, how it works under the hood and how it got here: everything you need to understand the first cryptocurrency in history, without jargon.
Average transaction time: ~10 minutes · Fees often under one euro · Network active since 2009 without a single outage
01 · What it is
Bitcoin is the first cryptocurrency: a form of money that exists only digitally and doesn't depend on central banks or governments. You can send it to anyone in the world, at any time, without going through an intermediary.
It was introduced in 2008 by an anonymous author under the pseudonym Satoshi Nakamoto, who disappeared in 2011, leaving the network in the hands of the community. Since then Bitcoin has run continuously, day and night, without ever being hacked.
The key point is its programmed scarcity: like gold, it exists in a limited supply. But unlike gold, you can send it to Tokyo in ten minutes.
21 million
Limited supply
There will never be more than 21 million bitcoin. This scarcity is written into the code and is why many compare it to digital gold.
2009
Born from a whitepaper
In October 2008 someone anonymous named Satoshi Nakamoto published the whitepaper; the Bitcoin network was born on January 3, 2009.
0 banks
No intermediaries
No bank or government controls the network. Transactions are verified by thousands of computers around the world, 24 hours a day.
02 · How it works
01
It's a public ledger where every transaction is recorded in linked «blocks». Anyone can consult it, but no one can alter the past: forging a transaction would be practically impossible.
02
Thousands of computers (the «miners») compete to verify transactions and add new blocks. The winner receives new bitcoin as a reward: that's how new coins enter circulation gradually and predictably.
03
To own bitcoin you need a wallet, which holds two keys: the public one, like an IBAN you share to receive funds, and the private one, like a signature used to spend. The private key must never be shared with anyone.
04
Sending bitcoin is like sending a digitally signed email: the network verifies the signature, checks the balance and records the movement within minutes, with fees often lower than an international bank transfer.
03 · The history
2008
On October 31, 2008, in the midst of the financial crisis, an anonymous figure using the pseudonym Satoshi Nakamoto publishes «Bitcoin: A Peer-to-Peer Electronic Cash System»: nine pages describing an electronic currency without intermediaries. Lehman Brothers had collapsed just days earlier: the timing couldn't have been better.
2009
On January 3, 2009, Satoshi mines the first block of the blockchain, the «genesis block», embedding a newspaper headline from that day: «Chancellor on brink of second bailout for banks». It's a manifesto: Bitcoin is born as a response to the banking system. The first transfers arrive in January, with Hal Finney among the first recipients.
2010
In March, BitcoinMarket is created, the first exchange market. In May, Laszlo Hanyecz pays for two pizzas with 10,000 bitcoin: the first real-world purchase in history. In July, Bitcoin's value multiplies (from cents to about $0.08) thanks to the first major media coverage and the moment mining overtakes Satoshi's.
2011
In early 2011 Bitcoin reaches parity with the dollar. In April Satoshi writes his last public note («I've moved on to other things») and disappears: he never revealed his identity. Leadership of the project passes to Gavin Andresen and the community: the network, as intended, works without its creator.
2013
The Cyprus crisis leads many to discover Bitcoin: the price rises from $13 to over $1,100 within a year. It's also the year of Mt. Gox, the Japanese exchange handling 70% of transactions — which starts to show its first cracks.
2014
Mt. Gox fails: about 850,000 bitcoin are stolen. It's the most painful lesson in Bitcoin's history — the problem wasn't the network, which was never breached, but centralized custodians. This is where the motto «not your keys, not your coins» is born, the foundation of the non-custodial philosophy.
2017
The price surpasses $19,000 in December. The network is clogged with fees and a major dispute arises: on one side the community opts for the Lightning Network (instant off-chain payments), on the other those who disagree create forks like Bitcoin Cash. Bitcoin remains the only «historical» chain recognized as the original.
2020-21
After COVID and the central banks' money printing, large companies start buying bitcoin as a store of value: MicroStrategy, Tesla, then Wall Street funds. The price hits $69,000 in November 2021. El Salvador becomes the first country to adopt it as legal tender.
2024
In January 2024 the SEC approves spot Bitcoin ETFs: for the first time it can be bought through a regular brokerage account. In April the fourth halving cuts the miners' reward to 3.125 bitcoin per block. In March the price surpasses the 2021 highs for the first time, then breaks through $100,000 in December.
04 · The numbers
9 pages
The whitepaper
Everything about Bitcoin starts with a nine-page document published on a cryptographers' mailing list. It's still readable today, even for non-technical people.
50 → 3.125 BTC
Mining rewards
Every halving (every 210,000 blocks, about 4 years) cuts the newly created bitcoin in half: from 50 in 2009 to 3.125 since 2024. Down to the 21 million cap, around 2140.
0 downtime
Since 2009
The Bitcoin network has run continuously since January 2009: never stopping for maintenance, successful attacks or outages. No bank can say the same.
05 · The lessons
No one knows who Satoshi is, yet the idea has outlived its author and no one can change it: a currency whose rules are in the code, not in the hands of whoever wrote it.
Mt. Gox and the collapses of centralized exchanges never touched the blockchain: every failure confirmed why Bitcoin exists — and why private keys are better kept in your own hands.
Historically, the crashes of 2011 (-93%), 2014 (-86%) and 2018 (-84%) were all followed by new highs. It's not a promise for the future: it's why people talk about long-term investing.
📜 Fun fact: the headline carved into the genesis block — «Chancellor on brink of second bailout for banks» — was the front page of The Times on January 3, 2009. It's not just a date: it's the reason Bitcoin exists. For the first transaction into the real world, read the story of the two pizzas, and to understand keys and security go back to the guide.