Spur Protocol Daily Quiz April 2026: Date-Wise Quiz Answers
A pending transaction, a vulnerable bridge and a growing blockchain database may seem unrelated. April's Spur Protocol quiz connected all three through questions about how networks operate and where risks appear. The reported answers sit beside their dates in this archive, making it easier to revisit an older question without searching separate daily posts.
The supplied source list covers 27 dates from April 3–25 and 27–30, 2026. The displayed archive also includes April 1 and 2 entries, which need checking against their original sources; no URL was supplied for April 26. Open each dated card for its reported question and answer. These records describe past rounds only.
April's Spur Protocol Quiz Records, Organized by Date
Open the card for the date you need. It keeps the reported question beside its answer text and original choice letter. Letters can move between versions, so compare the wording rather than relying on the option alone.
April 1–9: From Pending Trades to Network Threats
Early April questions follow transactions before confirmation, track how new blocks reach nodes and examine security weaknesses that can appear across connected blockchain systems.
1 April 2026 – Quiz Question and Answer
Question: What does the “blockchain trilemma” describe?
Answer: B) Balancing decentralization, security, and scalability.
Context: A blockchain may face trade-offs when it tries to stay secure, open to many participants, and fast enough for more users.
2 April 2026 – Quiz Question and Answer
Question: What is the role of a timestamp in a blockchain block?
Answer: D) It records when the block was created.
Context: A timestamp marks the time associated with a block. Each blockchain has rules for how this time is set and checked.
3 April 2026 – Quiz Question and Answer
Question: What is the role of a mempool in a blockchain network?
Answer: C) To hold pending transactions before confirmation.
Context: A mempool is a place where a node keeps transactions that have been received but not yet added to a block.
4 April 2026 – Quiz Question and Answer
Question: What can slow block propagation lead to in a network?
Answer: C) Temporary forks or chain splits.
Context: If block information travels slowly, different nodes may briefly disagree about which block is the chain tip.
5 April 2026 – Quiz Question and Answer
Question: What is a genesis block?
Answer: B) The first block of the blockchain.
Context: The genesis block is the starting block of a blockchain.
6 April 2026 – Quiz Question and Answer
Question: Why might a transaction with a higher fee get processed faster?
Answer: A) It is prioritized by validators or miners.
Context: Higher fees can make transactions more attractive to block producers when space is limited.
7 April 2026 – Quiz Question and Answer
Question: What does MEV primarily involve?
Answer: B) Rearranging transactions within a block for profit
Context: MEV stands for maximal extractable value and can involve changing the order in which transactions execute.
8 April 2026 – Quiz Question and Answer
Question: Why are cross-chain bridges often targeted by attackers?
Answer: A) They hold large pooled funds across chains.
Context: Bridges can control valuable assets on more than one network, creating attractive targets for attackers.
9 April 2026 – Quiz Question and Answer
Question: What is a replay attack in blockchain?
Answer: C) Reusing a valid transaction on another network.
Context: A replay attack can arise when a transaction or message valid in one setting is accepted again in another.
April 10–16: Privacy Proofs, Rollups and Contract Risks
This stretch starts with finality and moves into privacy proofs, different rollup designs and problems that can arise when smart-contract code goes wrong.
10 April 2026 – Quiz Question and Answer
Question: What does “finality” mean in blockchain?
Answer: A) Block can’t be reversed once confirmed.
Context: Finality describes when a transaction or block is considered irreversible under the network's rules.
11 April 2026 – Quiz Question and Answer
Question: What is the main idea behind zero- knowledge proofs?
Answer: B) Proving something is true without revealing the data.
Context: Zero-knowledge proofs can demonstrate a statement without exposing the underlying secret information.
12 April 2026 – Quiz Question and Answer
Question: What is a key assumption in optimistic rollups?
Answer: A) Transactions are assumed valid unless challenged
Context: Optimistic rollups generally rely on a period when invalid state claims can be challenged.
13 April 2026 – Quiz Question and Answer
Question: What distinguishes zk-rollups from optimistic rollups?
Answer: B) They use validity proofs for each batch.
Context: ZK-rollups use cryptographic validity proofs to show that a batch of transactions follows the rules.
14 April 2026 – Quiz Question and Answer
Question: Why are smart contract bugs especially risky?
Answer: C) Deployed code is difficult to change after launch.
Context: Bugs in deployed contracts may be hard to fix quickly, particularly when code or assets cannot be paused.
15 April 2026 – Quiz Question and Answer
Question: What makes a flash loan attack possible?
Answer: B) Borrowing large funds and repaying within one transaction.
Context: A flash loan is borrowed and repaid within the same blockchain transaction. Misuse can affect vulnerable DeFi systems.
16 April 2026 – Quiz Question and Answer
Question: How do users typically earn on DeSocial platforms?
Answer: A) Token rewards for engagement.
Context: Reward models for social activity vary by platform and are not guarantees of money or tradable tokens.
April 17–23: Trade Ordering and Exploitable Code
These dates ask what attackers can learn from pending trades, how pool prices shift and why transaction order may create opportunities for market abuse.
17 April 2026 – Quiz Question and Answer
Question: What enables front-running attacks in public blockchains?
Answer: B) Visibility of pending transactions before confirmation.
Context: When pending transactions are visible, other traders may try to act before them.
18 April 2026 – Quiz Question and Answer
Question: What is a key characteristic of a reentrancy attack?
Answer: C) Repeated contract calls before state update.
Context: Reentrancy can occur when an external call re-enters a contract before important state changes are finished.
Source note: The original post repeats this question and answer twice. It appears once here.
19 April 2026 – Quiz Question and Answer
Question: What defines a sandwich attack?
Answer: A) Placing trades before and after a target transaction.
Context: A sandwich attack surrounds a target trade with other trades to take advantage of its price impact.
20 April 2026 – Quiz Question and Answer
Question: What is “Open Source Al”?
Answer: B) Al with public code.
Context: The source appears to mean open-source AI, where implementation code is published for others to inspect or use under its license.
Source note: The original article uses “Al” rather than “AI.” The reported answer is preserved as published.
21 April 2026 – Quiz Question and Answer
Question: What happens when a liquidity pool becomes heavily imbalanced?
Answer: B) Asset prices shift due to pool ratio changes.
Context: Pool reserves affect the exchange rate in many automated market makers.
22 April 2026 – Quiz Question and Answer
Question: What is a time bandit attack?
Answer: A) Reordering past blocks to gain extra rewards.
Context: A time-bandit attack involves rewriting a past chain segment in pursuit of rewards or extractable value.
23 April 2026 – Quiz Question and Answer
Question: What is cross-domain MEV?
Answer: B) Extracting value across multiple chains or layers.
Context: MEV opportunities can span connected blockchains or scaling layers.
April 24–30: Validators, Bridge Messages and Storage
At month's end, the quiz shifts toward validator coordination, reused bridge messages, isolated network nodes and the growing amount of data that blockchain operators must store.
24 April 2026 – Quiz Question and Answer
Question: What is validator collusion?
Answer: A) Validators coordinating actions for shared benefit.
Context: Validator collusion may undermine fairness or network security when participants coordinate improperly.
25 April 2026 – Quiz Question and Answer
Question: What enables a bridge replay exploit?
Answer: A) Reusing valid messages across chains without checks.
Context: Cross-chain messages need safeguards that prevent the same authorization from being accepted more than once.
27 April 2026 – Quiz Question and Answer
Question: What is the main goal of an eclipse attack?
Answer: A) Isolate a node from honest peers.
Context: An eclipse attack attempts to surround a node with attacker-controlled peers.
28 April 2026 – Quiz Question and Answer
Question: What does state bloat refer to?
Answer: B) Growth of stored blockchain state data.
Context: State bloat means the amount of data nodes need to keep growing over time.
29 April 2026 – Quiz Question and Answer
Question: What typically happens when network demand increases?
Answer: C) Transaction fees tend to rise.
Context: When demand for limited block space increases, users may bid higher transaction fees.
30 April 2026 – Quiz Question and Answer
Question: What is the purpose of pruning in blockchain nodes?
Answer: B) Remove old data to save storage.
Context: Pruning helps a node limit storage by removing historical data it no longer needs for its operating mode.
What Happens to a Transaction Before It Is Final?
A blockchain transaction can pass through several stages. It may wait in a mempool before miners or validators include it in a block. Fees and network demand can affect that wait. The April 3, 6 and 29 questions each examine a different part of this journey.
Network trust was another recurring idea. Slow block delivery, a reused authorization or a node cut off from honest peers can alter what participants see. The April 4, 9, 25 and 27 questions show why validation checks and reliable peer connections matter.
April also compares tools designed for privacy and scale. Optimistic rollups let others challenge incorrect claims, while ZK-rollups rely on cryptographic proof of validity. The related zero-knowledge question shows why these techniques should not be treated as identical.
When a Short Quiz Answer Needs an Explanation
A multiple-choice answer rarely tells the whole technical story. A genesis block is simply the first block, but finality has different rules across networks. Paying more in fees also does not ensure an instant confirmation. The details behind a correct option still matter.
Two source quirks are worth noting. April 18 prints its reentrancy question twice within one article, so it appears once in the dated card. The April 20 article spells 'AI' as 'Al'; its wording is left unchanged, with a separate note explaining the apparent error.
Use April's Answer Cards for Past Questions Only
Match the original date first, then read the full question and answer together. An old letter by itself can be misleading when options change places. April's reward period is in the past, so the reported choices should not be passed off as answers to a new round.
To browse other months, visit the Spur Protocol Daily Quiz category page. If you want other games and question archives, see the Daily Crypto Rewards guide.
