Since the scriptSig of the coinbase transaction of a block can contain arbitrary data, what is the maximum number of bytes it can contain? I've seen various mentions of a limit around 100 bytes, but can't find that defined anywhere.
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1 Answer
The maximum is 100 bytes and is checked and defined here: https://github.com/bitcoin/bitcoin/blob/master/src/consensus/tx_verify.cpp#L195
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1The check was moved a few years ago, this link to v26 should be stable: github.com/bitcoin/bitcoin/blob/v26.0/src/consensus/… Commented Dec 7, 2023 at 22:14
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1Fwiw the check has been present since v0.1.0 (see "coinbase script size" in main.h) Commented Dec 7, 2023 at 22:50