In the UTXO model, what does an unspent transaction output represent?

A unit of Bitcoin that has not yet been used as an input in a new transaction

A record of all past transactions in a block

A digital signature that authorizes a transaction

A fee paid to miners for processing a transaction

In a Bitcoin transaction, what do the inputs reference?

The public keys of the recipients

The transaction ID and output index of previously unspent outputs

The digital signature of the sender

The block height where the transaction was mined

A developer is writing a script to validate a Bitcoin transaction. The transaction spends a P2PKH output. Which checks must the script perform?

Verify that the public key matches the address in the output script, but no signature is needed.

Verify that the signature is valid for the public key and that the public key hashes to the address in the output script.

Verify that the transaction fee is above the minimum relay fee, but no signature check is required.

Verify that the input references a UTXO that is at least six confirmations old.

Which statement accurately describes the peer-to-peer structure of the Bitcoin network?

Nodes communicate directly with each other, propagating transactions and blocks across the network

A central server maintains the authoritative copy of the blockchain and distributes it to clients

Nodes are organized in a hierarchical structure with a root node controlling the network

All nodes must be miners to participate in the network

EC-CouncilBlockchain Developer Certification

Domain 3Objective 2

Bitcoin Network and Its Transactions BDC Practice Questions (Page 6)

Part of the Bitcoin and Consensus Mechanisms domain, which makes up ~12% of our current practice bank.

42questions here

9free pages

6concepts

Questions 26–30

26foundation · easy
In the UTXO model, what does an unspent transaction output represent?
Select an answer first
27foundation · easy
In a Bitcoin transaction, what do the inputs reference?
Select an answer first
28application · medium
A developer is writing a script to validate a Bitcoin transaction. The transaction spends a P2PKH output. Which checks must the script perform?
Select an answer first
29application · medium
A developer is constructing a Bitcoin transaction that spends two UTXOs: one of 0.3 BTC and one of 0.4 BTC. The transaction sends 0.5 BTC to a recipient. What is the minimum change output required?
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30foundation · easy
Which statement accurately describes the peer-to-peer structure of the Bitcoin network?
Select an answer first

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