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2008
Event
milestone
Bitcoin's code is reviewed before launch
What happened
Satoshi shared the source privately for review: Ray Dillinger audited the blockchain, Hal Finney the scripting language, and both checked the accounting — among the only people to vet Bitcoin before it went live.
Significance
Bitcoin shipped having been read by almost no one. This quiet review by a tiny handful is one of the most overlooked moments of its creation.