Quiz 8 - Oracles

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Quiz 8 - Oracles

DeFi MOOC

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Question 1 - Which of the following DeFi applications is most likely to require external data: *

1 point

Token management contracts, such as ERC20

Decentralised and trustless betting on real world events

Uniswap, Curve, and other AMM DEXes

On-chain games that do not require randomness

Question 2: Which of the following statements is NOT TRUE? *

1 point

Because block generation is a centralized process, and because web data is ambiguous, incorporating oracle into the consensus protocol does not work because miners may lie or cheat.

For each oracle update, all nodes in the oracle committee must send a report to the miner.

Backup transmission is required because the node responsible for sending the report may fail.

Multiple sources / websites (redundancy) are required due to website outages and data corruption possibilities.

Question 3 - Assume an oracle committee has five nodes (A, B, C, D, E) and it is agreed to report the median value. Node E is a malicious node, and E observes the following values from the other four nodes (A: 1000, B: 1010, C: 1020, D: 1030). What are the upper and lower bounds of the aggregated value to which E can manipulate? *

1 point

1010 - 1020

1000 - 1030

No upper / lower bounds

Question 4 - Assume an oracle committee has five nodes (A, B, C, D, E) and it is agreed to report the median value. Nodes D and E collaborate to manipulate the aggregated oracle update, and the other three nodes report the following values (A: 1000, B: 1010, C: 1020). What are the upper and lower bounds of the aggregated value to which D and E can manipulate? *

1 point

1000-1010

1010-1020

1000-1020

No upper / lower bounds

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