In the previous lesson, we described the blockchain as a ledger maintained by many people together. In this lesson, we'll look at how this ledger was first created.

The story begins in 2008. That year, someone using the name “Satoshi Nakamoto” posted a nine-page document online. In the industry, it’s called a white paper—you can think of it as a public technical proposal that explains what a project aims to do and how it plans to do it. The idea behind this document was straightforward: today, banks keep track of all transfers. You have as much money as the bank says you have. So, could we do things differently—have a group of people each keep their own copy of the ledger and check them against one another, without needing a bank in the middle?

In January 2009, this system actually went live. The first bitcoins were mined, and the very first block was called the genesis block—the first page of the blockchain’s ledger, the starting point of the entire chain, with every later entry linked after it. “Mining” here doesn’t mean digging with a shovel. It means getting computers to solve a very difficult mathematical problem that’s easy to verify. Whoever solves it first gets the right to add a new batch of transactions to the ledger and, in return, receives newly issued coins as a reward. The people and machines doing this are called miners.

$BTC was the first cryptocurrency to come into being this way, in 2009. Its most distinctive rule is written into the code: there will only ever be 21 million coins, and not one more. This isn’t a promise made by some person; it’s a strict rule enforced collectively by everyone running the software. If you try to issue one more coin, others will check the books, see that the numbers don’t add up, and reject it. As an aside, people in the community have different views on this 21-million limit: one camp believes that scarcity makes it naturally resistant to inflation; another argues that a fixed supply gives early holders an unfair advantage and makes it less suitable as everyday money. Different projects take different approaches, and there’s no consensus yet.

To understand it, there’s another role you need to know about: nodes. A node is a computer program that keeps its own full copy of the ledger and forwards transactions to others. Miners around the world compete for the right to add entries, while nodes each keep a copy of the ledger and check it against the others. These two groups don’t know one another, and they have no employment relationship.

This is where people most often get things wrong: many assume there’s a company behind Bitcoin, with an office, customer service, a boss, and someone you can hold responsible if something goes wrong. There isn’t. It has no company, no headquarters, no board of directors. The code is all publicly available online, and anyone can download it, inspect it, and modify their own copy. The whole system is run voluntarily by miners and nodes around the world—some participate for the coin rewards, while others believe in the idea. People have different motivations. And for that very reason, there’s no “official” authority to issue a statement, change the rules, or refund your money. This feature is completely contrary to many people’s instincts, so it’s worth reading twice.

Here’s another true little story that gives you a sense of how little people thought of this thing in its early days. In 2010, a programmer posted on a forum saying he wanted to trade 10,000 bitcoins for two pizza vouchers. Someone actually took him up on the offer, and the two vouchers were worth about $41 at the time. Back then, it was just an ordinary online trade; by Bitcoin’s later prices, it became the most expensive pizza meal in history. The same event looks very different from the perspective of 2010 and from the perspective of today—and that shows how almost no one can tell what a new thing is worth when it first appears.

To wrap up this lesson: Bitcoin isn’t a product issued by a company. It’s a proposal published in 2008, set in motion by the first block in January 2009, with its total supply locked by code at 21 million coins. It’s kept running voluntarily by miners and nodes around the world—with no headquarters and no one to bail you out.

📖 A new lesson is published every day. There are 42 lessons in total; see the pinned course index post for the full list.

⏭ Next lesson: Lesson 3 · Who Keeps the Ledger: Mining and Consensus

⚠️ This lesson explains “why things are this way,” not “what you should buy,” and does not constitute investment advice.

That’s it for “Where Did Bitcoin Come From?” Remembering the part people most often get wrong is more useful than remembering the conclusion.