CBCP Ethereum 5

Question 1

What is 'MEV' (Maximal Extractable Value) in the context of Ethereum?

Accepted Answer

Profit validators or block proposers can earn by reordering, inserting, or censoring transactions within a block

Answer

MEV arises because block proposers control transaction ordering, enabling strategies like sandwich attacks, arbitrage, and liquidations.

Question 2

Which Ethereum token standard introduces a 'hook' mechanism allowing contracts to react when they receive tokens?

Accepted Answer

ERC-777

Answer

ERC-777 adds tokensReceived and tokensToSend hooks called on sender/receiver contracts, enabling richer composability.

Question 3

What is the 'Beacon Chain' withdrawal credential type '0x01' used for?

Accepted Answer

Linking a validator's withdrawal address to a specific Ethereum execution layer (0x01) address for ETH withdrawals

Answer

0x01 withdrawal credentials specify an Ethereum execution address, enabling Shanghai-era partial and full withdrawals.

Question 4

In Ethereum's account abstraction roadmap, what does EIP-4337 enable without requiring consensus-layer changes?

Accepted Answer

Smart contract wallets that can initiate transactions using a separate mempool and bundler infrastructure

Answer

EIP-4337 achieves account abstraction via UserOperations, a dedicated alt-mempool, and bundler nodes — no hard fork needed.

Question 5

What does the Ethereum state transition function's 'intrinsic gas' component cover?

Accepted Answer

A base cost charged before execution for transaction size, zero/non-zero bytes, and access list entries

Answer

Intrinsic gas (minimum 21,000 for a simple transfer) is deducted upfront and accounts for calldata bytes and access list overhead.

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