Blockchain Vocabulary Quiz
12 multiple-choice questions on blockchain vocabulary: distributed ledgers, consensus, smart contracts, mining, wallets and cryptography. B2–C1 level.
This quiz focuses on how the target vocabulary for Blockchain is actually used in context at B2–C1 level, rather than testing bare definitions. Correct answers you will need to identify include terms such as blockchain, decentralised, smart contract, private key and mining, each embedded in a full example sentence so you have to judge meaning from context, not just recognise an isolated word.
Working through all 12 questions and checking the explanations in the FAQ below is a quick way to spot any terms you are still unsure of. Revisiting the quiz again after a day or two, rather than only once, is one of the most reliable ways to move new vocabulary from passive recognition into words you can use confidently yourself in speaking and writing.
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Blockchain Vocabulary — FAQ
What is a 'blockchain'?
A blockchain is a shared digital record made of linked blocks of data that cannot easily be changed once added. Copies of the record are stored across many computers, or nodes, rather than in one central location, which makes it very difficult for any single party to alter past entries.
What does 'decentralised' mean?
A decentralised system is controlled by many independent participants rather than a single central authority, such as a bank or government. Because there is no single point of control, a decentralised network has no single point that can fail or be censored by one organisation.
What is a 'smart contract'?
A smart contract is a self-executing program stored on a blockchain that runs automatically when its predefined conditions are met. For example, a smart contract can release a payment the moment goods are confirmed as delivered, without needing a third party to process it manually.
What is the difference between a 'public key' and a 'private key'?
A public key is a shareable code that others use to send assets or messages to you on the network, similar to giving out your account number. A private key is a secret code that proves ownership and authorises transactions; it must never be shared, because losing it means losing access to your funds permanently.
What does 'mining' mean in blockchain?
Mining is the process of using computing power to verify transactions and add new blocks to the chain, and on many networks miners are rewarded with newly created tokens for doing this work. Mining can require enormous amounts of electricity, which is one criticism of some blockchain systems.
What is 'consensus' in a blockchain network?
Consensus is the agreement among independent network participants that a set of transactions is valid before it is permanently recorded. Different blockchains use different consensus mechanisms, such as proof of work or proof of stake, to reach this agreement without needing a central authority.
What does it mean for blockchain records to be 'immutable'?
Immutable means unable to be changed or deleted once recorded. Because each block contains a cryptographic hash linking it to the previous one, altering old data would require changing every subsequent block across every copy of the ledger, which is practically impossible on a large network.
What is a 'node' in a blockchain network?
A node is a computer that stores a copy of the blockchain and helps keep the network running by validating and relaying transactions. Thousands of nodes spread around the world hold identical copies of the ledger, which is what makes the system decentralised and resistant to tampering.
What is 'cryptography' used for in blockchain?
Cryptography is the use of mathematical codes to keep data secure and to verify the identities of participants. In blockchain, cryptography ensures that only the rightful owner of a private key can authorise a transaction, and it underpins the hashing that links blocks together securely.
What is a 'fork' in blockchain terminology?
A fork is a split in a blockchain that creates two separate versions of the network following different rules, often caused by a disagreement among the developer community about how the protocol should change. Some forks are temporary and resolve automatically, while others create permanently separate cryptocurrencies.