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EITC/IS/BTC Bitcoin Blockchain Developer
Certification. These questions are based on the
official syllabus, which covers topics ranging
from the architecture of Bitcoin (transactions,
blocks, scripting) to cryptography (ECDSA,
hashing), wallets (HD/BIP32), and the Bitcoin
network.
This set serves as a study guide to help you prepare for the certification exam.
EITC/IS/BTC BITCOIN BLOCKCHAIN DEVELOPER – PRACTICE
EXAM (250 QUESTIONS)
SECTION 1: BLOCKCHAIN & BITCOIN FUNDAMENTALS (Q1–30)
Q1. What is the primary defining characteristic of blockchain technology? A) Centralization B) Decentralization C) Anonymity D) Scalability Answer: B) Decentralization Explanation: Unlike traditional databases, blockchain operates on a decentralized network where no single entity has control, distributing authority across all participants. Reference: Blockchain Fundamentals – Core Properties Q2. In a blockchain, what is the basic unit that contains transaction data? A) Node B) Block C) Wallet D) Chain
Q4. Who is credited with creating Bitcoin and its underlying blockchain concept? A) Vitalik Buterin B) Charlie Lee C) Satoshi Nakamoto D) Gavin Andresen Answer: C) Satoshi Nakamoto Explanation: Satoshi Nakamoto is the pseudonymous person or group who authored the Bitcoin whitepaper and released the original Bitcoin software, inventing the first practical blockchain. Reference: Bitcoin History – Satoshi Nakamoto Q5. What is the primary purpose of a blockchain whitepaper? A) To advertise blockchain products B) To outline the technical details and vision of a blockchain project C) To serve as a legal document D) To provide user testimonials
Answer: B) To outline the technical details and vision of a blockchain project Explanation: The whitepaper is the foundational technical document. For Bitcoin, it outlined a "Peer-to-Peer Electronic Cash System," detailing how the technology would solve the double-spending problem. Reference: Blockchain Fundamentals – Whitepaper Q6. What distinguishes a cryptocurrency from traditional fiat currency? A) It is controlled by governments B) It relies on blockchain for transaction recording C) It is printed on paper D) It has physical coins Answer: B) It relies on blockchain for transaction recording Explanation: The defining feature of a cryptocurrency is its use of cryptographic techniques and a distributed ledger (blockchain) to secure and verify transactions, removing the need for a central authority like a bank.
D) Artificial intelligence Answer: B) Peer-to-peer networking Explanation: P2P networking allows all nodes in the network to communicate directly, share transaction data, and collectively agree on the valid state of the ledger (consensus) without a central server. Reference: Blockchain Fundamentals – Peer-to-Peer Network Q9. What role does cryptography play in blockchain technology? A) It increases transaction fees B) It secures data and ensures privacy C) It slows down the network D) It limits user access Answer: B) It secures data and ensures privacy Explanation: Cryptography is central to blockchain. It secures wallets (private keys), verifies ownership (digital signatures), and links blocks together (hashing), ensuring data integrity and security. Reference: Blockchain Fundamentals – Cryptography
Q10. What is the significance of the blockchain’s structure in enhancing security? A) It allows unlimited data edits B) It creates a single point of failure C) It links each block to the previous one using a hash D) It hides the transaction history Answer: C) It links each block to the previous one using a hash Explanation: Each block contains a cryptographic hash of the previous block. If a single block is altered, its hash changes, breaking the link and invalidating all subsequent blocks, making tampering easily detectable. Reference: Blockchain Architecture – Block Hashing Q11. What is contained within a block header in Bitcoin’s blockchain? A) Only transaction data B) Metadata such as version, timestamp, previous block hash, and nonce C) User personal information
Reference: Blockchain Architecture – Merkle Tree Q13. What is a key characteristic of the Bitcoin transaction format? A) It uses a simple binary structure B) It involves inputs, outputs, ScriptSig, and ScriptPubKey C) It only records sender information D) It is unencrypted Answer: B) It involves inputs, outputs, ScriptSig, and ScriptPubKey Explanation: Bitcoin transactions are built from inputs (references to previous outputs) and outputs (new locks on funds). The ScriptSig and ScriptPubKey are the scripts that unlock and lock the funds, defining the conditions for spending them. Reference: Bitcoin Architecture – Transaction Structure Q14. Which concept is most essential for preventing a user from spending the same Bitcoin twice? A) Centralized banking B) The UTXO model
C) Merkle root D) Wallet encryption Answer: B) The UTXO model Explanation: The Unspent Transaction Output (UTXO) model acts as a global accounting ledger. A transaction's inputs refer to specific UTXOs. Once an input is spent, it is removed from the UTXO set, making it impossible to use it again in another transaction, thus preventing double-spending. Reference: Bitcoin Architecture – UTXO Model Q15. How does a blockchain achieve transparency? A) Through private ledgers B) By limiting access to data C) By making transaction records publicly accessible D) By encrypting all transactions Answer: C) By making transaction records publicly accessible Explanation: Transparency is achieved by distributing the full, immutable ledger to every node on the network. While transactions
### SECTION 2: CRYPTOCURRENCY & HASH FUNCTIONS (Q31–60)
Q17. Which cryptographic hash function is used extensively in the Bitcoin protocol? A) SHA- 256 B) MD C) AES- 256 D) Scrypt Answer: A) SHA- 256 Explanation: SHA-256 is the primary hashing algorithm used in Bitcoin. It is used for proof-of-work mining (double SHA-256) and to create addresses, providing high security and collision resistance. Reference: Bitcoin Cryptography – SHA- 256 Q18. The Bitcoin network’s difficulty target is adjusted to ensure what? A) The block reward stays consistent
B) The price of Bitcoin remains stable C) The average time between blocks remains about 10 minutes D) The mempool never gets full Answer: C) The average time between blocks remains about 10 minutes Explanation: The difficulty target adjusts every 2016 blocks (roughly every two weeks) to ensure that, regardless of the total network hashing power, the average time to find a new block stays approximately 10 minutes. Reference: Bitcoin Mining – Difficulty Target Q19. What does the term “ledger” refer to in blockchain technology? A) A digital wallet B) A record of all transactions C) A mining node D) A cryptographic key Answer: B) A record of all transactions
A) RSA (Rivest-Shamir-Adleman) B) ECDSA (Elliptic Curve Digital Signature Algorithm) C) AES (Advanced Encryption Standard) D) EdDSA (Edwards-curve Digital Signature Algorithm) Answer: B) ECDSA (Elliptic Curve Digital Signature Algorithm) Explanation: Bitcoin uses the secp256k1 elliptic curve as part of the ECDSA standard to generate private keys (random numbers) and their corresponding public keys, which are then used to create wallet addresses. Reference: Bitcoin Cryptography – ECDSA Q22. What is a "nonce" in the context of Bitcoin mining? A) A type of wallet B) A number used once to try and generate a valid block hash C) A transaction fee D) A peer-to-peer node address Answer: B) A number used once to try and generate a valid block hash
Explanation: Miners repeatedly change the "nonce" value in the block header to generate a hash that meets the difficulty target. It's a crucial part of the proof-of-work process. Reference: Bitcoin Mining – Nonce Q23. How do Bitcoin nodes achieve consensus? A) By voting with their IP addresses B) By following the chain with the highest cumulative proof-of-work C) By trusting a central server to validate blocks D) By electing a leader node Answer: B) By following the chain with the highest cumulative proof- of-work Explanation: This is known as Nakamoto Consensus. Nodes are programmed to always accept the valid chain that represents the most cumulative computational work (the "longest chain"), ensuring a single, agreed-upon history. Reference: Bitcoin Architecture – Nakamoto Consensus Q24. What is the main function of the "mempool"?
Answer: C) High energy consumption for mining Explanation: The primary criticism of PoW is the high amount of electricity consumed by miners running specialized hardware (ASICs) to compete for block rewards, which has significant environmental and cost implications. Reference: Bitcoin Consensus – Proof-of-Work (Environmental Impact)
SECTION 3: BITCOIN TRANSACTIONS & SCRIPTING (Q61–90)
Q26. When a transaction output is encumbered by a script that says "5 OP_ADD 7 OP_EQUAL," what does it require to be spent? A) A single signature from a specific private key B) The solution to a math puzzle (a value that when added to 5 equals
C) A predefined number of signatures from a group of keys D) A specific locktime expiration
Answer: B) The solution to a math puzzle (a value that when added to 5 equals 7) Explanation: This is a demonstration of a stack-based operation. To spend the output, the unlocking script (ScriptSig) must provide the correct number (2) which will be combined with the number 5 to push 7 onto the stack. The script compares that result to 7 for a valid spend. Reference: Bitcoin Scripting – Stack-Based Validation Q27. Which of the following is a standard transaction type that allows funds to be locked using a hash of a public key? A) Pay-to-PubKey (P2PK) B) Pay-to-PubKey-Hash (P2PKH) C) Pay-to-Script-Hash (P2SH) D) Multi-signature Answer: B) Pay-to-PubKey-Hash (P2PKH) Explanation: P2PKH is the most common transaction type. It locks funds to a Bitcoin address, which is a hashed version of the recipient's public key. To spend the funds, the recipient must provide their public key and a valid digital signature.
