Bitcoin is the first cryptocurrency and is still by a wide margin the largest and most widely held. It was described in a nine-page paper in October 2008 by someone using the name Satoshi Nakamoto, and the first block was mined on 3 January 2009. That genesis block contains a headline from The Times — “Chancellor on brink of second bailout for banks” — which is usually read as a political statement about the financial system Bitcoin was designed to opt out of.
What Bitcoin actually is can be described in three sentences. It is a distributed ledger of transactions secured by proof-of-work mining. It has a fixed maximum supply of 21 million BTC, with new coins issued as block rewards that halve every four years. And it has no central operator — the rules are enforced by thousands of nodes running the same software and rejecting any block that breaks them.
Everything else that is said about Bitcoin — digital gold, hard money, censorship-resistant, number go up — is commentary on those three properties rather than independent facts.
What Makes It Different From Everything Else
The thing Bitcoin does that no later chain has quite matched is credibility. The scarcity is hard: 21 million is not a policy choice that can be overturned, it is a line in the code that every node would have to agree to change. The security budget is enormous: Bitcoin miners collectively spend something on the order of $10-20 billion a year on electricity and hardware to defend the network. The governance is conservative: changes to the protocol require multi-year soft-fork processes, and contentious proposals almost never ship. The result is that Bitcoin is the slowest chain in crypto to evolve, and this is treated by its supporters as a feature.
This is also why Bitcoin is boring compared to Ethereum or Solana. It does not have programmable smart contracts in any meaningful sense (the scripting language is deliberately limited). It does not have DeFi, NFTs, or most of the innovation that defines post-2017 crypto. The Lightning Network is the main scaling story and it is a payment layer rather than a smart contract layer. Bitcoin’s whole pitch is that it does one thing — be a neutral, scarce, censorship-resistant store of value — and does it better than anything else. Whether you find that compelling is mostly a matter of what you think the point of crypto is in the first place.
The Numbers
BTC trades 24/7 on hundreds of exchanges. Spot Bitcoin ETFs were approved in the United States in January 2024 and now hold somewhere north of 900,000 BTC between them, which is about 4.5% of the total supply. Block rewards halved to 3.125 BTC in April 2024, the fourth halving in Bitcoin’s history, and will halve again in early 2028. Current hash rate is around 700 exahashes per second, which is an amount of computation it would be difficult to describe meaningfully but is several orders of magnitude beyond what was plausible when the network launched.