ArtofBlockchain

Difficulty - Medium

Total Plays - 23

Allowed Time - 10 sec

Best time - 0.899

NFT "minting" means:

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#A

#B

#C

#D

Explanation:
Minting converts digital files (art, music) into blockchain-based NFTs.

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Difficulty - Medium

Total Plays - 27

Allowed Time - 10 sec

Best time - 0.590

The first block is called:

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#A

#B

#C

#D

Explanation:
The genesis block is the first block in a blockchain, initiating the chain.

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SolidityStarter
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Difficulty - Medium

Total Plays - 13

Allowed Time - 10 sec

Best time - 4.554

What makes nested delegatecalls dangerous?

Tip: Click "Play" to reveal options and start playing.

#A

#B

#C

#D

Explanation:
Each delegatecall runs in the caller’s storage space, so nesting them multiplies the chances of overwriting incorrect slots. This breaks upgradeability guarantees and corrupts state. Auditors treat deep delegatecall chains as red flags.

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Difficulty - Medium

Total Plays - 13

Allowed Time - 10 sec

Best time - 4.927

Why do storage reads cost more than memory reads?

Tip: Click "Play" to reveal options and start playing.

#A

#B

#C

#D

Explanation:
Storage accesses require Merkle-Patricia proof validation at the state level. This makes SLOAD one of the most expensive operations in Solidity. Caching values into memory significantly reduces repeated cost.

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