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Blog Blockchain Blockchain MCQs

Blockchain MCQs

By: Manish

Last Updated: September 19th, 2026

Read Time: 30:00 Minutes

1. Blockchain Fundamentals

2. Cryptography and Hashing

3. Consensus Mechanisms

4. Bitcoin and UTXO

5. Ethereum and Smart Contracts

6. Smart Contract Security

7. Tokens and Digital Assets

8. Wallets and Transactions

9. Blockchain Networking

10. Scaling and Layer 2

11. DeFi and DAOs

12. Enterprise and Supply Chain

13. Privacy, Interoperability and Advanced Concepts

14. Practical and Scenario-Based

15. Current Blockchain Engineering Topics

16. Your Quiz Result

Preparing for a blockchain certification, interview, or Web3 role? This collection of Blockchain MCQs is a practical resource for testing your knowledge of blockchain fundamentals, cryptography, consensus mechanisms, Bitcoin, Ethereum, smart contracts, tokens, wallets, DeFi, scaling, security, enterprise blockchain, and real-world blockchain scenarios.

Note: Score 60% or higher to unlock an exclusive offer of up to 50% off on self-paced Blockchain courses.

Let’s begin!

Blockchain Fundamentals

1. What is blockchain primarily used for?

A) Maintaining a shared, tamper-evident record across participants
B) Rendering web pages
C) Replacing every database
D) Managing local files only

2. What is a block?

A) A network cable
B) A structure containing records plus metadata that links it to the chain
C) A private key
D) A database password

3. What links a block to its predecessor?

A) A username
B) A CSS selector
C) A cryptographic hash of the previous block
D) A random port

4. What is decentralization?

A) Keeping all data on one server
B) Removing all nodes
C) Using offline storage only
D) Distributing control or record maintenance across multiple participating nodes

5. What is a blockchain node?

A) A computer or software instance participating in a blockchain network
B) A physical coin
C) A database column
D) A web browser tab

6. What is a blockchain ledger?

A) A hardware wallet
B) A shared record of transactions or state maintained according to network rules
C) A compiler
D) A spreadsheet template only

7. What does immutability mean in blockchain?

A) Data can never change under any circumstance
B) Every database is immutable
C) Confirmed historical data is difficult to alter under the network security assumptions
D) No new data can be added

8. Why are hashes important?

A) They generate electricity
B) They replace consensus
C) They store passwords in plain text
D) They provide compact cryptographic representations used for integrity and linking

9. What is a transaction?

A) A signed request or state change processed according to network rules
B) A monitor setting
C) A source-code comment
D) A network cable

10. Why is consensus required?

A) It controls website colors
B) Nodes need a protocol for agreeing on valid network state
C) It replaces cryptography
D) It removes all nodes

Cryptography and Hashing

11. What is a cryptographic hash function?

A) A compression format only
B) A networking protocol
C) A function that maps input data to a fixed-size digest with security properties
D) A database engine

12. What is the avalanche effect?

A) Key reuse
B) Network broadcasting
C) Database sharding
D) A small input change causes a substantially different hash output

13. What is collision resistance?

A) Finding two different inputs with the same hash should be computationally difficult
B) Reversing a hash
C) Creating a wallet
D) Selecting a validator

14. What is a digital signature used for?

A) Generating block time
B) Authenticating a signer and detecting alteration of signed data
C) Replacing consensus
D) Creating tokens automatically

15. What is asymmetric cryptography?

A) One shared password
B) Only hash functions
C) Cryptography using related public and private keys
D) Two identical public keys

16. What must remain secret in a blockchain wallet?

A) A public address
B) A block number
C) A transaction timestamp
D) The private signing key or equivalent secret

17. What can a public key help others do?

A) Verify signatures or derive a public identifier depending on the system
B) Recover a lost private key
C) Change a confirmed block
D) Reverse any transaction

18. What is a nonce in proof-of-work?

A) A private wallet password
B) A value miners vary while searching for a valid block header
C) A contract address
D) A network cable

19. What is a Merkle tree?

A) A consensus algorithm
B) A wallet type
C) A hash-based tree that commits to a collection of data efficiently
D) A mining pool

20. What is a Merkle proof?

A) A private key
B) A block reward
C) A smart-contract language
D) A compact proof that an item belongs to a committed Merkle tree

Consensus Mechanisms

21. What is blockchain consensus?

A) A protocol process for agreeing on valid network state
B) A database backup
C) A wallet password
D) A user interface

22. What does Proof of Work rely on?

A) Website voting
B) Computational work that makes valid block production costly
C) Random passwords
D) Manual block entry

23. What does Proof of Stake use?

A) GPU rendering only
B) Physical mining equipment
C) Economic stake and protocol rules to select or weight validators
D) Email verification

24. What is a validator?

A) A wallet address only
B) A database administrator
C) A browser plugin
D) A participant performing protocol duties such as proposing or attesting to blocks

25. What is staking?

A) Committing assets under protocol rules to participate in proof-of-stake consensus
B) Mining with hard drives
C) Encrypting a wallet
D) Creating a private blockchain

26. What is slashing?

A) Increasing transaction fees
B) A protocol penalty for defined validator misconduct
C) Deleting all blocks
D) Encrypting transactions

27. What is finality?

A) When a wallet is installed
B) When a block is drafted
C) A condition after which a transaction or block is considered sufficiently irreversible
D) When a transaction is typed

28. What is a 51% attack?

A) A wallet backup failure
B) A contract syntax error
C) A DNS outage
D) Control of enough consensus influence to potentially reorganize or censor transactions

29. What is delegated proof of stake?

A) A model where participants delegate voting or staking power to selected producers
B) A GPU mining algorithm
C) A hashing algorithm
D) A wallet format

30. Why does consensus design matter?

A) It controls UI colors
B) It determines how valid state is agreed upon and how attacks are resisted
C) It replaces cryptography
D) It removes networking

Bitcoin and UTXO

31. What is Bitcoin?

A) A centralized bank database
B) A programming language
C) A decentralized digital currency network using a blockchain and proof of work
D) A cloud storage service

32. What does UTXO stand for?

A) Universal Token Transfer Operation
B) User Transaction Transfer Object
C) Unified Transaction Tracking Output
D) Unspent Transaction Output

33. What does the UTXO model track?

A) Unspent transaction outputs that can be consumed by later transactions
B) Account passwords
C) Block timestamps only
D) Smart contracts only

34. What is a Bitcoin transaction input?

A) A block reward
B) A reference to a previous output being spent plus authorization data
C) A wallet application
D) A mining device

35. What is a Bitcoin transaction output?

A) A validator node
B) A private key
C) An amount locked under conditions specifying how it can be spent
D) A block header

36. What is the Bitcoin mempool?

A) A permanent archive
B) A hardware wallet
C) A private key store
D) A node collection of valid but unconfirmed transactions awaiting inclusion

37. What is a Bitcoin transaction fee?

A) A fee used to incentivize transaction inclusion under network rules
B) A wallet creation charge by definition
C) A government tax by definition
D) A cryptographic key

38. What is a mining pool?

A) A staking contract
B) A group of miners combining computational resources and sharing rewards
C) A wallet backup
D) A blockchain database table

39. Why can a Bitcoin transaction remain unconfirmed?

A) Hashes cannot be calculated
B) Wallets cannot sign
C) It may be waiting for block inclusion due to network conditions or transaction competition
D) Blocks cannot contain transactions

40. What is a Bitcoin block reward?

A) A wallet password
B) A contract event
C) A DNS record
D) Protocol-defined compensation associated with producing a valid block, including applicable issuance and fees

Ethereum and Smart Contracts

41. What is Ethereum?

A) A blockchain platform supporting programmable smart contracts and decentralized applications
B) A hardware wallet
C) A database engine
D) A centralized payment gateway

42. What is a smart contract?

A) A paper legal document
B) Program code deployed on a blockchain that executes according to platform rules
C) A private key
D) A mining machine

43. What is the Ethereum Virtual Machine?

A) A physical server rack
B) A wallet seed
C) The execution environment used to execute Ethereum smart-contract code
D) A consensus algorithm only

44. What is gas?

A) Physical fuel
B) A stablecoin
C) A block hash
D) A measure used to price computational work and resource consumption

45. Why do Ethereum transactions consume gas?

A) To account for computation and protect network resources
B) To create private keys
C) To encrypt blocks
D) To replace validators

46. What is an Ethereum account?

A) Only a hardware device
B) An addressable entity that can hold assets and interact with contracts
C) A block header
D) A mining pool

47. What is a smart-contract event?

A) A consensus fork
B) A wallet seed
C) A log emitted by contract execution that applications can observe
D) A private transaction key

48. What is an Ethereum Layer 2?

A) A private key format
B) A hardware wallet
C) A replacement for cryptography
D) A scaling system that processes activity separately while connecting settlement or security to Ethereum

49. What is an oracle?

A) A mechanism that supplies external information to smart contracts
B) A validator only
C) A private-key generator
D) A wallet password

50. Why do smart contracts need oracles for many real-world facts?

A) Hashes do not exist
B) Blockchains need an external mechanism to bring off-chain information on-chain
C) Contracts cannot store data
D) Validators cannot execute code

Smart Contract Security

51. What is reentrancy?

A) A mining difficulty issue
B) A wallet backup issue
C) A contract is called again before a prior execution completes, potentially exploiting unsafe state handling
D) A hashing collision

52. What is the checks-effects-interactions pattern?

A) A consensus algorithm
B) A wallet recovery process
C) A block compression method
D) Validate conditions, update state, then perform external calls

53. Why validate smart-contract inputs?

A) Unexpected or malicious inputs can cause incorrect state changes or vulnerabilities
B) It increases block size
C) It removes gas costs
D) It guarantees decentralization

54. What is an access-control vulnerability?

A) A timestamp error
B) A sensitive function can be called by an unauthorized account or role
C) A hash collision
D) A wallet display issue

55. What is integer overflow?

A) A network fork
B) A signature format
C) A numeric operation exceeds the representable range of a numeric type
D) A wallet seed

56. Why are oracle attacks important?

A) Oracles create private keys
B) Oracles replace validators
C) Oracles remove confirmations
D) Manipulated external data can cause contracts to make incorrect decisions

57. What is a flash-loan attack?

A) Using large temporary borrowing within an atomic transaction sequence to exploit protocol logic or pricing
B) A hardware wallet theft
C) A mining hardware failure
D) A consensus upgrade

58. What is a smart-contract audit?

A) A block reward
B) A structured review of contract code and design for security and correctness issues
C) A token transfer
D) A wallet address

59. Why use a test network for contract testing?

A) It guarantees no bugs
B) It changes private keys
C) It can expose logic and integration problems without risking production assets
D) It removes the need for testing

60. What is an upgradeable contract?

A) A contract that never changes
B) A block with no transactions
C) A wallet without a key
D) A contract architecture allowing implementation logic to change through a defined mechanism

Tokens and Digital Assets

61. What is a blockchain token?

A) A digital asset represented and managed according to blockchain-based rules
B) A physical coin
C) A network cable
D) A database index

62. What is a fungible token?

A) A unique collectible
B) A token whose units of the same class are generally interchangeable
C) A block header
D) A validator key

63. What is a non-fungible token?

A) A mining algorithm
B) A private key
C) A distinct token or identifier that is not interchangeable like fungible units
D) A consensus vote

64. What is a token standard?

A) A hardware specification only
B) A block reward
C) A wallet seed
D) A defined interface and behavior that compatible tokens follow

65. What is token minting?

A) Creating or issuing new token units according to token rules
B) Deleting a block
C) Signing a transaction
D) Mining every blockchain

66. What is token burning?

A) Creating validators
B) Removing token units from circulation through a defined mechanism
C) Increasing block size
D) Backing up a wallet

67. What is a stablecoin?

A) A mining algorithm
B) A blockchain node
C) A crypto asset designed to maintain relatively stable value against a reference asset or mechanism
D) A smart-contract language

68. What is tokenization of real-world assets?

A) Replacing every asset with bitcoin
B) Deleting legal ownership
C) Turning every asset into code only
D) Representing rights or interests in traditional assets with blockchain-based tokens

69. What is a governance token?

A) A token that can provide voting or governance-related rights
B) A private key
C) A block hash
D) A network cable

70. What is token custody?

A) A consensus algorithm
B) Safeguarding the keys or mechanisms that control digital assets
C) A mining reward
D) A block timestamp

Wallets and Transactions

71. What is a blockchain wallet?

A) A physical coin purse only
B) A mining pool
C) Software or hardware that manages keys and helps users interact with blockchain assets
D) A database server

72. What is a seed phrase?

A) A block hash
B) A transaction fee
C) A contract event
D) A human-readable backup representation from which wallet keys can be derived

73. Why is a seed phrase sensitive?

A) Anyone who obtains it may be able to recover and control the wallet
B) It increases gas
C) It changes block size
D) It is public by design

74. What is a hot wallet?

A) A wallet made of metal
B) A wallet whose keys are kept online or readily accessible through an internet-connected environment
C) A mining pool
D) A cold-storage vault

75. What is a cold wallet?

A) A public blockchain
B) A smart contract
C) A key-storage approach designed to keep signing secrets offline or isolated
D) A block explorer

76. What is a hardware wallet?

A) A blockchain node only
B) A compiler
C) A mining pool
D) A device designed to protect private keys and perform signing securely

77. What is a blockchain address?

A) A public identifier used to receive or interact with blockchain assets
B) A private password
C) A seed phrase
D) A validator penalty

78. What is transaction signing?

A) Hashing a block only
B) Using a private key or signing mechanism to authorize a transaction
C) Mining a block
D) Creating a database

79. Why verify a destination address before sending?

A) Addresses are always temporary
B) Validators reverse mistakes
C) Confirmed blockchain transactions are generally difficult or impossible to reverse
D) Wallets always detect fraud

80. What is multisignature authorization?

A) Using one password twice
B) Mining with several GPUs
C) Creating multiple blockchains
D) Requiring signatures from multiple authorized keys before an action executes

Blockchain Networking

81. What is a peer-to-peer blockchain network?

A) A network where nodes communicate directly with other participating nodes
B) A centralized web server
C) A paper ledger
D) A single wallet

82. What is node discovery?

A) Finding private keys
B) Finding other nodes that can participate in network communication
C) Creating tokens
D) Mining rewards

83. What is block propagation?

A) Deleting blocks
B) Encrypting wallets
C) Distribution of newly created blocks across network nodes
D) Changing token prices

84. What is transaction propagation?

A) Creating private keys
B) Changing consensus
C) Deleting mempool entries
D) Distribution of transactions across nodes before confirmation

85. What is a block explorer?

A) A service or interface for inspecting public blockchain data
B) A private key vault
C) A mining algorithm
D) A smart-contract compiler

86. What is a full node?

A) A wallet address
B) A node that independently verifies blockchain data according to protocol rules
C) A token standard
D) A block reward

87. Why run a full node?

A) It guarantees profit
B) It creates tokens automatically
C) It enables independent verification and reduces reliance on third-party data
D) It removes all fees

88. What is a blockchain fork?

A) A wallet password
B) A cryptographic hash
C) A token burn
D) A divergence in protocol rules or chain history that can produce different valid chain versions

89. What is a hard fork?

A) A protocol change that is not backward-compatible with nodes following old rules
B) A temporary delay
C) A private transaction
D) A wallet backup

90. What is a soft fork?

A) A hardware failure
B) A protocol change designed to remain compatible with older rules under defined conditions
C) A seed phrase
D) A mining pool

Scaling and Layer 2

91. Why do blockchains face scalability challenges?

A) Wallets cannot exist
B) Hashes are optional
C) Consensus, capacity, execution, storage, and propagation can constrain throughput
D) Blocks cannot contain data

92. What is Layer 2 scaling?

A) A wallet backup
B) A new hash function
C) A mining device
D) Processing activity on a secondary system while connecting settlement or security to a base blockchain

93. What is a rollup?

A) A Layer 2 approach that batches transactions and posts relevant data or proofs to a base chain
B) A hardware wallet
C) A private password
D) A consensus key

94. What is an optimistic rollup?

A) A mining algorithm
B) A rollup that assumes submitted state transitions are valid unless challenged through its dispute mechanism
C) A wallet type
D) A token standard

95. What is a zero-knowledge rollup?

A) A hardware wallet
B) A block explorer
C) A rollup using cryptographic validity proofs to demonstrate correct state transitions
D) A mining pool

96. What is a state channel?

A) A database table
B) A wallet seed
C) A block hash
D) A mechanism allowing participants to transact off-chain and later settle results on-chain

97. What is sharding?

A) Splitting data or execution responsibilities across partitions to improve scalability
B) Encrypting a private key
C) Deleting nodes
D) Creating NFTs

98. What is a sidechain?

A) A wallet backup
B) A separate blockchain connected to another blockchain through a defined mechanism
C) A transaction signature
D) A block timestamp

99. Why can Layer 2 reduce base-layer congestion?

A) It removes validators
B) It disables transactions
C) It can process interactions away from the base chain and submit compressed or summarized information
D) It changes private keys

100. What trade-offs can scaling solutions introduce?

A) They always eliminate risk
B) They require no software
C) They remove cryptography
D) Additional complexity, trust assumptions, latency, or liquidity fragmentation

DeFi and DAOs

101. What is decentralized finance?

A) Financial applications built using blockchain-based assets and programmable protocols
B) A centralized spreadsheet
C) A bank branch
D) A database backup

102. What is a decentralized exchange?

A) A mining pool
B) A blockchain-based protocol for exchanging assets without traditional centralized custody or order matching
C) A hardware wallet
D) A block explorer

103. What is an automated market maker?

A) A mining algorithm
B) A wallet backup
C) A trading protocol using liquidity pools and mathematical pricing rules
D) A consensus node

104. What is a liquidity pool?

A) A physical storage tank
B) A private key
C) A block header
D) Assets supplied to a protocol to support functions such as decentralized trading

105. What is yield farming?

A) Providing assets to protocols in pursuit of protocol-defined returns or incentives
B) Mining bitcoin with GPUs
C) Creating addresses
D) Running a full node

106. What is a DAO?

A) A database engine
B) An organization coordinated through blockchain-based rules and governance mechanisms
C) A hardware wallet
D) A network cable

107. What is on-chain governance?

A) Private email voting
B) Manual server configuration
C) Governance actions recorded or enforced through blockchain mechanisms
D) Offline spreadsheets

108. What is impermanent loss?

A) A lost private key
B) A mining failure
C) A block reorganization only
D) A potential loss relative to simply holding assets that liquidity providers can experience from price changes

109. What is protocol composability?

A) The ability for blockchain applications or protocols to interact and build on one another
B) A wallet backup technique
C) A hashing method
D) A block-size rule

110. Why does smart-contract risk matter in DeFi?

A) Smart contracts cannot hold assets
B) Bugs or economic vulnerabilities can cause loss or unexpected protocol behavior
C) Validators reverse every transaction
D) All protocols are risk-free

Enterprise and Supply Chain

111. Why might an enterprise use a permissioned blockchain?

A) It requires anonymous miners
B) It cannot enforce access
C) Participants can be identified and access can be restricted according to organizational requirements
D) It removes governance

112. What is a permissionless blockchain?

A) A private spreadsheet
B) A closed database
C) A hardware wallet
D) A network generally open for participants to join and transact subject to protocol rules

113. What is supply-chain traceability?

A) Tracking the movement and relevant events of products or assets across a supply chain
B) Deleting product records
C) Mining tokens
D) Replacing warehouses

114. How can blockchain support provenance?

A) It guarantees physical truth automatically
B) It can provide a shared record of relevant events and attestations
C) It eliminates sensors
D) It replaces inspections

115. What is the oracle problem?

A) Blockchains cannot hash data
B) Private keys cannot exist
C) On-chain systems need trustworthy mechanisms to obtain reliable off-chain information
D) Validators cannot store transactions

116. Why is identity important in permissioned networks?

A) It makes blocks larger
B) It replaces consensus
C) It removes audit trails
D) Participants may need controlled access based on verified organizational identities

117. What is a consortium blockchain?

A) A blockchain governed or operated by a group of organizations
B) A single-user wallet
C) A public token only
D) A mining algorithm

118. How can blockchain improve auditability?

A) It makes every event true
B) Shared time-ordered records can make certain transactions or process events easier to verify
C) It removes all errors
D) It prevents physical fraud automatically

119. What is a key limitation for supply-chain data?

A) Hashes verify physical truth
B) Consensus detects every lie
C) A blockchain can preserve inaccurate input data if the original information is false
D) Blockchains remove human error

120. When might a traditional database be preferable?

A) Databases cannot store records
B) Databases are always insecure
C) Blockchains have no applications
D) When a trusted central operator controls the workflow and a blockchain adds little value

Privacy, Interoperability and Advanced Concepts

121. What is a zero-knowledge proof?

A) A cryptographic method for proving a statement without revealing underlying information beyond the proof
B) A wallet password
C) A mining reward
D) A block explorer

122. What is MEV?

A) A wallet standard
B) Value extracted from transaction ordering or block-production opportunities
C) A hashing algorithm
D) A hardware device

123. Why can transaction ordering matter in DeFi?

A) Ordering never affects state
B) Transactions have no state
C) Ordering can change execution prices, liquidations, and arbitrage opportunities
D) Blocks contain one transaction only

124. What is blockchain interoperability?

A) Creating one wallet
B) Deleting validators
C) Changing a block hash
D) The ability of different blockchain systems to exchange information or assets through defined mechanisms

125. What is a bridge?

A) A mechanism used to transfer assets or information between blockchain ecosystems
B) A mining device
C) A seed phrase
D) A database index

126. Why are bridges security-sensitive?

A) Bridges never hold value
B) They may rely on contracts, validators, custodians, or messaging systems that become attack targets
C) They never use cryptography
D) They remove all trust assumptions

127. What is account abstraction?

A) A mining algorithm
B) A block explorer
C) An approach making blockchain accounts more programmable with flexible authorization and transaction behavior
D) A hash function

128. What is an oracle network?

A) A validator private key
B) A wallet seed
C) A block header
D) A system that supplies external data or events to blockchain applications

129. What is a blockchain data availability concern?

A) Systems need a way for relevant transaction or state data to remain accessible for verification
B) Keys need no backups
C) Blocks cannot be hashed
D) Wallets cannot sign

130. Why is privacy difficult on public blockchains?

A) Hashes reveal private keys automatically
B) Public ledgers can expose transaction activity even when addresses are pseudonymous
C) Consensus removes all metadata
D) Wallets never use addresses

Practical and Scenario-Based

131. A company wants several independent organizations to share a record without one controlling it. What is relevant?

A) A single spreadsheet
B) One administrator database
C) A distributed ledger with shared governance and validation
D) Offline storage

132. A user signs a transaction with a private key. What does the signature primarily show?

A) The transaction is profitable
B) The transaction is reversible
C) The network has no fees
D) Authorization by the key holder and integrity of signed data

133. A contract makes an external call before updating sensitive state. What should developers examine?

A) Reentrancy and unsafe external-call ordering
B) Screen resolution
C) Block color
D) Wallet branding

134. A proof-of-stake validator violates a slashable rule. What may happen?

A) Token minting
B) The protocol may reduce or penalize its stake
C) Automatic gas refunds
D) Wallet recovery

135. Employees enter false supply-chain data before it is written on-chain. What remains true?

A) Hashes verify physical truth
B) Consensus detects every lie
C) The blockchain may preserve incorrect input data even though later alteration is difficult
D) Blockchain removes human error

136. A contract needs a current exchange rate. What does it need?

A) A new private key per price
B) A mining GPU
C) A larger wallet
D) A trustworthy oracle or external data mechanism

137. A network is congested and transaction costs rise. What may help?

A) An appropriate Layer 2 or scaling mechanism
B) Increasing private-key length
C) Deleting historical blocks
D) Disabling signatures

138. A treasury should not be controlled by one compromised key. What helps?

A) A public seed phrase
B) Multisignature authorization
C) One shared password
D) Disabling transaction signing

139. An upgradeable contract has one administrator key. What risk exists?

A) Hash collisions are guaranteed
B) Blocks become smaller
C) Compromise or misuse of the upgrade authority could affect the contract
D) Mining stops

140. A user loses the only private key controlling assets. What is the likely consequence?

A) Validators automatically recover it
B) The blockchain resets the account
C) An explorer restores it
D) Access to those assets may be permanently lost

Current Blockchain Engineering Topics

141. What is an on-chain governance proposal?

A) A proposed protocol or parameter change submitted through a blockchain governance process
B) A wallet backup
C) A block hash
D) A hardware update

142. Why are smart-contract upgrade keys sensitive?

A) They determine block size universally
B) They can change contract behavior or permissions if the upgrade mechanism allows it
C) They create bitcoin
D) They replace consensus

143. What is a timelock in blockchain governance?

A) A mining algorithm
B) A wallet type
C) A delay between approving an action and executing it
D) A hash function

144. Why can timelocks improve governance security?

A) They guarantee no bugs
B) They eliminate validators
C) They make keys public
D) They provide a window for review or response before a sensitive action executes

145. What is an intent-based blockchain interaction?

A) A user expresses a desired outcome while a system determines an execution path satisfying the intent
B) A private key backup
C) A block header
D) A mining pool

146. What is restaking in proof-of-stake ecosystems?

A) Burning all tokens
B) Using staked assets or their security commitment to support additional services under defined rules
C) Encrypting wallets
D) Mining with GPUs only

147. What is a restaking risk?

A) It guarantees profit
B) It removes all validators
C) Additional services can introduce extra slashing, smart-contract, or systemic risks
D) It prevents software updates

148. What is a modular blockchain architecture?

A) Using one database table
B) Removing consensus
C) Using only hardware wallets
D) Separating functions such as execution, settlement, consensus, or data availability across specialized components

149. What is data availability sampling intended to help with?

A) Efficiently checking that enough block data is available without every participant downloading everything
B) Creating private keys
C) Minting NFTs
D) Changing wallet passwords

150. Why is formal verification used for some smart contracts?

A) It increases token price
B) It can mathematically check specified properties of contract behavior
C) It replaces auditing in every case
D) It creates validators

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Manish

Manish has worked on blockchain projects ranging from smart contract development to practical distributed-ledger use cases. He's learned to separate genuine applications from hype-driven ones that don't hold up to scrutiny. He tests new tools in sandbox environments before forming opinions, giving developers a clear-eyed understanding of blockchain technology.

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