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Hal Finney's private email to Satoshi during the pre-release code review period, asking foundational questions about Bitcoin's scalability: 'How large do you envision it becoming? Tens of nodes? Thousands? Millions?'
SerHack published an analysis of a pre-release Bitcoin genesis block dated September 10, 2008 — discovered in source code Satoshi shared privately in November 2008. The test block had a completely different hash, trivially easy difficulty, and an initial block reward of 10,000 units. The September 10 date coincides with Lehman Brothers announcing $3.9 billion in losses.