Genesis block
The first block of a blockchain. Bitcoin's is dated 3 January 2009.
Genesis block in more detail
The first block, known as the genesis block, is dated 3 January 2009. Satoshi released the first version of the software five days later.
The genesis block contains a line of text: that day's headline from The Times of London, about a second bailout for banks. It shows the block was not made before that date. Many people also read it as a comment on a system where failing banks are rescued with public money.
All 128 terms · Checked against the lesson's sources on 8 October 2026.
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