People | Who is Nick Szabo?
Nick Szabo wrote a short article introducing smart contracts in 1994, then wrote another in 1996 discussing their applications in greater depth.
Bit gold and Bitcoin have a lot in common, such as generating new units by solving computational puzzles and linking the results together. But Bit gold was never actually implemented.
Ethereum, where $ETH is found, brought the concept of smart contracts into widespread practical use. Currently: 2435.85.
Markets are always uncertain, so decide in advance what you'll do if your view turns out to be wrong.

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