# Quiz 5 - Bitcoin Mining

Bitcoin depends on miners to:
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Q. Which of the following are true about Bitcoin miners?

a. The target hash has become so small that the block header nonce alone isn't generally large enough to allow miners so search enough of the hash output space to find a valid block

b. Bitcoin miners can more efficiently mine for blocks by specifically targeting parts of the nonce search space that have more puzzle solutions

c. Over a 2 week period, the average time to mine a block is always 10 minutes

d. The mining difficulty is recomputed roughly every 2 weeks to keep the proof-of-work puzzle difficult
a. The target hash has become so small that the block header nonce alone isn't generally large enough to allow miners so search enough of the hash output space to find a valid block - correct;

d. The mining difficulty is recomputed roughly every 2 weeks to keep the proof-of-work puzzle difficult - correct;