Bitcoin: digital gold

In late 2008, in the middle of a global banking crisis, a person or group using the name Satoshi Nakamoto published a nine-page paper proposing a system called Bitcoin. The paper was technical, almost dry. The idea inside it was anything but.

The proposal: a digital money that does not need a bank, a government, or any central operator to function. The first transactions ran in early 2009. Within a few years, Bitcoin was being traded for real dollars, then real cars, then real companies. It is now held by major institutions, treated as a reserve asset by some countries, and used by people in unstable economies as a way to hold value when their own currency falls apart.

Why "digital gold"?

For thousands of years, gold has been the world's default backup for money. It is scarce, it does not rot, you cannot print more of it, and everyone roughly agrees on what it is. When governments mismanage their currencies, people buy gold. When the financial system gets shaky, central banks buy gold. The metal is not useful for much, but it is trusted.

Bitcoin was designed to copy those properties in software. The supply is fixed at 21 million coins, ever. The rate at which new coins enter circulation is cut roughly in half every four years. No central authority can change either of these rules without the agreement of basically everyone running the network. So like gold, you cannot just make more.

How new bitcoins enter the world

Every ten minutes or so, the network bundles up the latest pending transactions into a new block. To decide who gets to add the next block, computers around the world race to solve a meaningless math puzzle. The winner gets a reward in fresh bitcoins, plus the fees from the transactions in their block.

This is called mining, and it is what you have probably read about: warehouses of computers consuming a lot of electricity. The process looks wasteful, but it is what makes the system honest. To cheat the network, an attacker would need more computing power than every honest miner combined, which would cost more than they could possibly steal.

The supply schedule

This curve is the single most important fact about Bitcoin. Unlike a national currency where supply is set by a committee that can change its mind, Bitcoin's supply schedule was written into the code in 2009 and has not changed since. Predictable scarcity is the entire point.

What people actually use it for

Bitcoin is best understood as a long-term store of value rather than as everyday money. Block times of ten minutes and modest transaction fees make it more like a global settlement layer than a way to buy coffee. The use cases that have stuck are the ones that play to its strengths.

• A long-term hedge against currency debasement, especially for people in countries with high inflation.
• A way to move large amounts of value across borders without going through banks.
• A reserve asset on the balance sheets of companies and a few governments.
• A neutral monetary base that no single party controls — the same reason central banks hold gold.
• A speculative asset for people betting that adoption keeps growing.

What it is not

Bitcoin is not a tech stock, even though it trades like one in the short term. It does not pay dividends, it does not have earnings, and there is no company behind it. It is also not a payment app, even though you can pay with it. The closer comparison is to a commodity: a thing of fixed supply that markets price based on demand.

Bitcoin is the first money in human history that no one has to issue, no one has to back, and no one can take away.

Bitcoin solved the digital scarcity problem, but it does very little else. The next big leap was a chain that could run actual programs, not just send money. That is Ethereum, and it is what we look at next.