Lecture 3: Understanding and Breaking Smart Contracts

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What is a smart contract? *

1 point

Name and explain two type of accounts on Ethereum *

4 points

Name and explain three types of transactions in Ethereum *

6 points

What is gas? *

1 point

Gas is a standard metric for measuring only the storage of a transaction.

Gas is a standard metric to associate the approximate cost of an operation cost in the EVM in terms of storage and execution.

Gas is a standard metric for measuring only the computation of a transaction.

What is a fee market? *

1 point

At a high level, what is the compilation process for Solidity before it is deployed to the network? *

1 point

Breaking smart contracts

What is a front-running attack for a smart contract and how can a user perform it without collaborating with a miner? Please explain it with an example. *

6 points

What is the checks-effects-interaction paradigm? Please provide an example. *

3 points

Why is a contract-in-the-middle attack possible if tx.origin is used instead of msg.sender? *

4 points

What is an out-of-gas exception and how can it be used to lock up coins? *

4 points

Figure 1 outlines a contract that is vulnerable. How can a malice contract use selfdestruct to attack it

4 points

At a high level, how does a re-entrancy attack work? And how can we prevent it? *

6 points

Advanced Contracts

What is an oracle smart contract? And why do we need it? *

4 points

What is a smart contract factory? And why is it useful to let another smart contract verify the code deployed? *

4 points

Name and explain three permission systems that can be built into smart contracts. *

6 points

What does SafeTransfer in ERC271 do? *

1 point

It checks additional information about the sender before transferring the NFT.

It checks the receiver is a smart contract that is capable of transferring the NFT.

It checks the receiver is NOT a smart contract account. It is an externally owned account.

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