4/13/2009
⛓️ First Mention of the "Blockchain"
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On April 13, 2009, Satoshi Nakamoto first used the term blockchain to refer to the total length of the chain. "I'm trying to think of a better way to phrase this, maybe '%d network blocks' or '%d blockchain'.'
Source:
https://archive.bitcoin-calendar.org/archive/1748724698.009562/index.html#singlefile.html