What is the genesis block?
Quick Answer
Block 0 — the very first Bitcoin block, mined by Satoshi on January 3, 2009. Embedded in it is a newspaper headline about bank bailouts, a timestamp and a manifesto in one line. Its 50 BTC reward can never be spent.
TL;DR
Bitcoin's block zero, Jan 3 2009, carrying a bank-bailout headline as both proof of date and statement of purpose.
Key Takeaways
- 1Mined January 3, 2009 — Bitcoin's birthday
- 2Contains the headline: 'Chancellor on brink of second bailout for banks'
- 3Its 50 BTC reward is unspendable by a quirk of the code
- 4Hardcoded into every Bitcoin node ever run
Full Explanation
Every blockchain has to start somewhere. Bitcoin's block 0 was mined by Satoshi on January 3, 2009 and is hardcoded into the software itself — every node ever run begins its copy of history with this block.
Inside it, Satoshi embedded a line of text: 'The Times 03/Jan/2009 Chancellor on brink of second bailout for banks' — that day's London Times front page. Practically, it proves the block wasn't mined before that date. Symbolically, it's the whole project in one headline: Bitcoin launched as an exit from a financial system being rescued with printed money. It's the closest thing to a mission statement Satoshi ever wrote into the protocol.
Two quirks complete the story. The genesis block's 50 BTC reward sits in an address that the code never added to the spendable ledger — visible forever, spendable never; people still send small tributes to it. And the next block didn't arrive for six days, as if the network paused after its first breath. From that block to today's global network: 2010 first real-world purchase (two pizzas, 10,000 BTC), four halvings, nation-state adoption, spot ETFs — all stacked on block 0.