Crypto Jobs Advanced Topics 3

Question 1

What is the main advantage of an account abstraction (ERC-4337) wallet over a traditional EOA?

Accepted Answer

It enables programmable validation like social recovery, gas sponsorship, and batched transactions

Answer

Account abstraction makes wallets smart contracts, enabling features like social recovery, paymasters, and batched operations without changing the base protocol.

Question 2

In tokenomics, what does a 'vesting cliff' refer to?

Accepted Answer

A period during which allocated tokens cannot be claimed until a set date, after which they begin unlocking

Answer

A vesting cliff is an initial lock period before any tokens unlock, used to align team and investor incentives long-term.

Question 3

Which cryptographic primitive underpins most blockchain digital signatures like Bitcoin and Ethereum?

Accepted Answer

Elliptic Curve Digital Signature Algorithm (ECDSA)

Answer

Bitcoin and Ethereum use ECDSA over the secp256k1 curve to sign transactions and prove key ownership.

Question 4

A cross-chain bridge is exploited for hundreds of millions. What is the typical root cause?

Accepted Answer

Flawed validation of deposit/withdrawal proofs or compromised multisig keys

Answer

Most major bridge hacks stem from improper proof verification or compromised signer keys controlling locked funds.

Question 5

What does 'finality' mean in a blockchain consensus context?

Accepted Answer

The point at which a transaction is irreversible and cannot be reorganized out

Answer

Finality is the guarantee that a confirmed transaction cannot be reversed, which is probabilistic in PoW and often deterministic in BFT-style PoS.

Crypto Jobs Practice Test

Crypto Jobs Practice Test

Crypto Jobs Advanced Topics 3