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Ethereum and smart-contracts

Resources:

Additional resources:

Questions:

  • What are smart contracts? What problem do they solve?
  • Why is it impossible to write smart contracts for bitcoin, but possible for Ethereum?
  • Describe process from calling a smart contract function to adding transaction to block?
  • How to make an http request from inside the smart contract function?
  • Is it possible to call the function of another smart contract from within a smart contract function?
  • Is it possible to call a smart contract function using a delayed timer? Can the contract return funds to the user automatically without calling functions if the transaction was violated?
  • Who pays the fee for calling the smart contract method? How is this commission calculated? What is Gas Price and Gas Limit?
  • What happens if the commission is not enough to perform the function of a smart contract?
  • How is the difference between wallet and contract in the Ethereum network?
  • What is the reason of calling a transaction without a recipient?
  • What is the difference between a chain of states and a chain of changes?
  • What is storage in the smart contract of the Ethereum network?
  • Is it real to change contract code?

Tasks:

  • Look at what the code of smart contract looks like here