Trust and execution - Test | RedDuck Academy

01.

A deposit instruction checks that the user's token account has the same mint as the vault. The vault is passed as an unchecked account. What does the check prove?

That the vault belongs to the program

Only that the two accounts the caller passed agree with each other

That the token account belongs to the user

That the mint is a real SPL token

02.

Which of these can be the root of trust for a chain of checks? (Select all that apply.)

A PDA of your program with fixed seeds

A hardcoded address compared against the account's key

An account whose data has the right layout and discriminator, at any address

An account your program owns, when anyone can create such accounts through a permissionless instruction

03.

What was the missing check in the Wormhole exploit?

That the account in the instructions sysvar slot had the sysvar's known address

That the guardian signatures were in the right format

That the message came from the expected chain

That the Secp256k1 program was deployed

04.

At Cashio, the collateral token account matched the bank, and the Saber pool accounts matched each other. Which check would have broken the caller's chain?

That the bank was one of the protocol's own, at an address derived from the protocol's PDA

That the collateral token account's mint matched the bank

That the Saber pool accounts matched each other

That the user signed the transaction

05.

A launchpad wants to stop snipers in the first seconds after a launch. Which approach follows identity rejection?

Reject trades from wallets on a list of known sniper addresses

Charge a fee that starts high and decays with time since launch, the same for every wallet

Allow only the team's wallet to trade in the first minute

Require every buyer to register before the launch

06.

Meteora's rate limiter allowed one swap per transaction, yet a transaction could hold many swap2 calls. What was the mistake?

The check looked for an instruction by its name instead of counting swaps on the pool

The check read the wrong sysvar

The fee was too low to deter snipers

swap2 used a different pool account

07.

Which of these are identity checks in the right place? (Select all that apply.)

The owner signs a withdrawal of their own tokens

The admin signs a change to the protocol fee

Only the team's bot may call the instruction that distributes rewards

Only addresses on a list may bring a price update to the program

08.

What condition makes a background job safe to open to any executor?

The result does not depend on who sends the transaction

The executor is paid at least the transaction fee

The executor is registered in the program

The job runs at most once per slot

09.

Role inversion worked for Pyth's pull oracle and failed for Symmetry V2. What was the difference?

After the flip, the party that needed the action still decided when it happened for Pyth, and did not for Symmetry

Pyth paid its executors and Symmetry did not

Pyth kept the role on-chain and Symmetry moved it off-chain

Symmetry's flip cost more compute

10.

A staking pool's reward per staked token is 0.08. A staker with 200 tokens last saw 0.05. What happens when the staker claims?

6 tokens are paid, and the staker's marker becomes 0.08

16 tokens are paid, and the staker's marker becomes 0.08

6 tokens are paid, and the staker's marker becomes 0.03

10 tokens are paid, and the staker's marker stays 0.05

11.

A staker deposits more tokens into a lazy loading pool. In what order should the program act?

Settle the rewards owed on the old stake, move the marker, then add the deposit

Add the deposit, then settle rewards on the new stake

Add the deposit and move the marker without settling

Wait for the next reward to arrive, then settle

12.

Which of these can rely on lazy loading alone, with no paid executor? (Select all that apply.)

Paying a staker the rewards they are owed

Charging a perpetual position its accrued funding

Liquidating a position as soon as its collateral falls below the threshold

Expiring an order at its deadline

13.

In Squads, the members of a multisig change. How many proposal accounts does the program write?

None. It writes one index in the multisig account, and each proposal is compared with it when touched

Every open proposal

Only the approved proposals

One per remaining member

14.

Which answers can one action move by a single step both when an input is added and when it is removed? (Select all that apply.)

A total

A count

An average stored as a sum and a count

A maximum

15.

In Hxro's parimutuel market, what does a winner's payout depend on?

Their bet, the winning side's total and the pool after fees

A walk over every bet in the round

The order in which the bets were placed

The number of winners, counted at settlement

01.Solana PRO

02.Trust and identity

03.Permissionless execution

04.Cost distribution

05.State partitioning

06.Deferred execution

07.Order and consent

08.Outside Data

09.Dependencies and exits

10.Conclusion

Trust and execution - Test