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Bitcoin discovery

What is the most important aspect in Nakamoto's invention? This is important to understand, because the progress will surely exploit this discovery. Bit it is far from obvious. Proposed answers include:

Ultimately, the question is whether any discovery is widely applicable. Compare with AI (unvoidable march of the machines) and with nanotechnology (unavoidable technological progress of getting to atomic scales). What is so "unavoidable" about Bitcoin discovery?