What exactly are smart contracts?
In 2016, The DAO project was attacked due to a code vulnerability. Ethereum subsequently underwent a hard fork, and the original chain, which did not follow the fork, continued as Ethereum Classic (ETC).
Smart contracts themselves cannot access off-chain data. If they need external information such as exchange rates, it must be provided through an oracle.
Calling smart contracts on Ethereum requires paying Gas with $ETH .
Market conditions are always uncertain—what happens if the assumptions you set in advance turn out to be wrong?

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This information has been compiled from public sources. Please verify it yourself.