
B3. Bitcoin blocks
Authored by Cristina Solà
Computers
University
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12 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
All Bitcoin block headers have the same size
True
False
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
All Bitcoin blocks have the same size.
True
False
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Block headers contain:
a pointer to the next block header
a list of transaction hashes
the merkle root of the transactions in the block
the signature of the miner
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Block timestamps...
specify the exact time when the block was mined
are always increasing with each new block
are not validated
are used to adjust difficulty
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Given a Merkle Tree with 8 transactions, in order to proof that Tx8 is in the block, we need to show:
Tx8, h8, h78, h5678
Tx8, h7, h56, h1234
Tx8, h6, h34, h1234
Tx8, h2, h12, h5678
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A transaction is invalid if...
it spends outputs that have not been already spend
it is a coinbase transaction
it spends an ouput that has already been spend
the sum of input amounts is different than the sum of output amounts
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A block is invalid if...
it contains no transactions
it contains at least one transaction
the block hash is lower than the target
the merkle root is correct
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