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On-Chain Forensics & Security
1) In advanced on-chain analysis, monitoring “whale movements” helps analysts do what?
A. Increase gas fees on purpose
B. Spot large holders’ activity that may influence prices
C. Hide transactions from public view
D. Freeze wallets with big balances
2) Which of the following is a common early warning sign of a rug pull?
A. Immutable smart contract with verified code
B. Locked liquidity on-chain
C. Developers hold a high percentage of tokens with no vesting
D. High daily trading volume
3) What is oracle manipulation in the context of DeFi attacks?
A. Using oracles to forecast weather
B. Forcing incorrect price data into the protocol via flash loans or low-liquidity feeds
C. Sending valid price feeds to DeFi apps
D. Generating random numbers on-chain
4) In smart contract auditing, a “reentrancy” vulnerability allows an attacker to:
A. Increase gas limits indefinitely
B. Call a contract repeatedly before state updates are finished
C. Freeze the network permanently
D. Access private keys
5) Which past hack involved governance flaws and recursive call vulnerabilities, resulting in one of the earliest major DeFi losses?
A. Wormhole exploit
B. Ronin Bridge hack
C. The DAO hack
D. Mt. Gox collapse
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