How does Bitcoin actually work?
No coin, no vault, just a public ledger since 2009. Where bitcoins come from, what a wallet really holds, the 21 million cap, halving, and why bitcoin is not anonymous.
Bitcoin is money as a public record. There is no coin, no file on your laptop, no vault. There is one shared ledger listing every transaction since 2009, copied across thousands of computers, and your bitcoin is simply the ledger agreeing that certain amounts belong to addresses you control. Understand that and the rest of Bitcoin stops being mysterious.
The system was described in 2008 by someone using the name Satoshi Nakamoto, in a nine page paper, in the middle of a banking crisis. Nobody knows who that was. They walked away from a fortune and never came back, which remains the strangest part of the whole story.
Where do bitcoins come from?
They are created as payment for guarding the ledger. Roughly every ten minutes, machines around the world race to seal the next batch of transactions into a block. The winner earns freshly created bitcoin plus the fees from that batch. This race is called mining, though nothing gets dug up. It is closer to a lottery where buying tickets costs electricity.
The reward halves every four years. It began at 50 bitcoin per block, and after the 2024 halving it stands at 3.125. The supply is capped at 21 million coins forever, and that hard cap is most of the investment argument. Whether scarcity alone makes something valuable is a debate, and the price swings say the market has not settled it.
What is a wallet and what does it actually hold?
A wallet holds no coins. It holds keys. A private key is a secret number that lets you sign transactions from an address, and the matching public address is what people send coins to. The coins themselves never leave the ledger.
This is why the phrase not your keys, not your coins exists. Keep coins on an exchange, and the exchange holds the keys. You have an IOU. When the FTX exchange collapsed in 2022, customers learned the difference the hard way. Hold your own keys, and the coins answer to you alone, along with the responsibility. Lose the key and the coins are frozen in place forever, visible on the ledger and untouchable. Nobody can reset that password.
Can I actually buy things with bitcoin?
Sometimes, but that is not really how it gets used. Payments in bitcoin are slower than a card and the fees vary with traffic. A transaction settles in about ten minutes on a calm day, longer when the network is busy. Most holders treat it as a speculative asset or savings they hope will grow, not spending money. In countries with collapsing currencies it has found real use as an escape hatch, which is easy to forget from a country with a stable bank.
Is bitcoin anonymous?
No, and this catches people ten years later. Every transaction is public and permanent. Investigators follow coins across the ledger the way accountants follow money through books, and the moment coins touch an exchange that verified your ID, the trail gets a name. The Silk Road marketplace ran on bitcoin, and those ledger trails helped end it. Your wallet also connects to the internet from an IP address, and that is its own trail. Anonymous is the wrong word. Pseudonymous with a permanent public diary is closer.
Should I buy bitcoin?
That is a money question, not a technology question, and nobody on the internet should answer it for you. The honest facts: it has swung from under one dollar to over a hundred thousand, with brutal crashes between, and it can go to zero without asking permission. Never put in what you cannot lose. Buy from a large regulated exchange, expect ID checks, and treat anyone who DMs you about guaranteed returns as the scammer they are. The coin might be an experiment. The people hunting your coins are not.