Smart contracts live on blockchains (or in this case, hashgraph) as pieces of code. One way to think of smart contracts is that they replace the middlemen of traditional finance. Unlike everything I've done with Hedera so far which was written in Javascript using the Hedera SDK Node package, smart contracts are written in Solidity. This Solidity file is then compiled into bytecode which can be uploaded to Hedera Hashgraph. One advantage of Hedera is that the gas price for executing a smart contract is much cheaper than on Ethereum.
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