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  • Is the 80-byte block header included in the calculation? Commented Jun 27, 2017 at 16:17
  • I'm pretty sure it is. Commented Jun 27, 2017 at 16:21
  • Total Size and Base Size both include nonwitness data? So some bytes are being counted twice? That means a 4MB block would be impossible Commented Jul 28, 2017 at 21:49
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    In theory, you can get pretty close to 4M, by having transactions that consist almost entirely of witness data. In practice, that won't happen for normal financial transactions, closer to 2M. Commented Aug 10, 2017 at 2:35
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    @PieterWuille is it a mistake to measure weight in bytes? (Or MB) Commented Aug 23, 2017 at 21:46