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I know the coinbase transaction's input is usually just has a dummy scriptSig, but what if a miner used it to spend an UTXO? Would it be verified as an actual spend, or would the block be rejected?
Can the coinbase transaction be used to spend an UTXO?
Answers
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It would be rejected. The coinbase input must use a very specific previous outpoint: 0x0000000000000000000000000000000000000000000000000000000000000000ffffffff. This prevents it from referring to an actual previous outpoint.
