What is Bitcoin and why was it created?
Bitcoin is the first decentralized digital currency, published in 2008 in a landmark white paper by an anonymous author known as Satoshi Nakamoto. The network launched on January 3, 2009, with the Genesis Block — containing a newspaper headline about a bank bailout. Bitcoin was created as a direct response to the 2008 financial crisis and distrust in central banks.
How does Bitcoin work?
Bitcoin runs on a distributed ledger (blockchain). Every transaction is broadcast to the network, where miners validate it by solving complex mathematical problems (Proof-of-Work). Mining rewards are the only way new BTC is created — no central bank, no money printing.
Each block contains: the previous block's hash (the chain link), a timestamp, transaction data and a nonce. Changing one block changes its hash — and every subsequent block. This makes the blockchain practically immutable.
Limited supply: why does it matter?
Bitcoin's total supply is capped at 21 million BTC — forever. About 19.7 million have been mined so far. This deflationary model means that, unlike the dollar which central banks can print without limit, Bitcoin becomes increasingly scarce.
Halvings: the engine of long-term growth?
Every ~210,000 blocks (~4 years), the mining reward is cut in half. April 2024 saw the fourth halving: the reward dropped from 6.25 to 3.125 BTC per block. Historically, halvings have always preceded a major bull market.
- 2012 halving → 2013 BTC rose 8,000%
- 2016 halving → 2017 BTC rose 2,800%
- 2020 halving → 2021 BTC rose 700%
- 2024 halving → effects still unfolding
Bitcoin as "digital gold"
Institutions increasingly treat Bitcoin as a store of value. ETF funds (BlackRock, Fidelity) approved in January 2024 give institutional investors direct access. MicroStrategy, Tesla and some countries hold BTC in reserves.
Risks and criticisms
Bitcoin isn't without risks: high volatility, regulatory pressure in some countries, energy consumption (PoW) and the potential for better technology are real concerns. Never invest more than you can afford to lose.