FinTech 21-1 Advanced Solidity

Which were objectives for Advanced Solidity day 1?

• Distinguish the general difference between a coin and a token in the context of crypto.

• Design smart contracts that can replace traditional business mechanisms.

• Explain the difference between fungible and non-fungible tokens and their use-cases.

• Build a simple tokenized reward system in Solidity that distributes tokens to users based on their actions.

Which is NOT true of tokens?

• You can tokenize things like gold, silver, the USD, real-estate, your car, artwork, property, and virtually anything that holds some value.

• Business assets cannot easily be tracked and transferred, because of the human in the loop problem.

• Since tokenized assets are blockchain-powered, these tokens can be traded globally without any additional infrastructure.

• Items you purchase at a grocery store can be tokenized, allowing you to scan a code on your groceries to pull up the entire supply chain history of that item, allowing you to prove exactly where it came from.

Select all true statements regarding coins and tokens:

• Tokens are often built on top of a blockchain platform, whereas coins usually have their own blockchain.

• Both coins and tokens can have a fixed or infinite amount of value, depending on the system.

• Both coins and tokens can be used to implement a stablecoin.

• A token is programmed with a smart contract.

Which Python data structure are Solidity mappings most like?

• tuple

• list

• dictionary

• dataframe

How does an integer underflow attack work?

• Subtracts 1 from 0 resulting in the maximum value.

• Adds 1 to the maximum value resulting in 0.

• Passes a negative number to an uint causing the value to invert.

• Divides by zero causing an infinite loop.

What does this syntax do:

using SafeMath for uint;

• Imports the SafeMath library.

• Makes uint variables immutable.

• Links SafeMath to uint types.

• Sets the SafeMath variable to an uint.

How was Advanced Solidity day 1 for you?

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