Let’s talk about smart contracts.
The concept of “smart contracts” was first proposed by cryptographer Nick Szabo in the 1990s.
One thing many people overlook: smart contracts can’t access off-chain information on their own. When they need external information, such as prices, they rely on oracles to bring it on-chain.
Before confirming a transaction, make sure you understand the contract address shown in your wallet and the action to be performed. If you don’t understand, don’t sign.
Calling a contract on Ethereum requires $ETH to pay Gas.