Must a block contain a coinbase transaction? If so, how is this enforced?
asked Sep 2, 2014 at 3:56
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related: What is the coinbase?– Murch ♦Commented Nov 7, 2015 at 15:02
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2 Answers
Yes, it must.
Block without coinbase transaction will be rejected by network.
From the Protocol, rule #6:
First transaction must be coinbase (i.e. only 1 input, with hash=0, n=-1), the rest must not be
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1The coinbase transaction is important as the mark of bitcoin generation. But what would it be for when the last bitcoin were mined? Commented Jan 28, 2016 at 13:36
Every block must include one or more transactions. The first one of these transactions must be a coinbase transaction which should collect and spend the block reward and any transaction fees paid by transactions included in this block.
Bitcoin Foundation Developer Guide— https://bitcoin.org/en/developer-guide#transaction-data
answered Sep 2, 2014 at 4:16