0) Adjust BIP16 & BIP30 enforcement values
1) Reduce amount that peers can adjust our time to eliminate an attack vector. Thanks to
coblee for this fix.
2) Zeitgeist2 patch - thanks to Lolcust and ArtForz. This fixes an issue where a
51% attack can change difficulty at will. Go back the full period unless it's the
first retarget after genesis.
3) Avoid overflow in CalculateNextWorkRequired(). Thanks to pooler for the overflow fix.
4) SegWit ContextualCheckBlockHeader adjustment and extra coverage
5) Reject peer proto version below 70002. Thanks to wtogami for this patch.
6) Adjust default settings for Litecoin
Segwit's version bit will be signalled for all invocations of CreateNewBlock,
and not specifying segwit only will cause CreateNewBlock to skip transactions
with witness from being selected.
Github-Pull: #9955
Rebased-From: abe7b3d3ab
mininode now supports witness transactions/blocks, blocktools
has a helper for adding witness commitments to blocks, and script
has a function to calculate hashes for signature under sigversion
1, used by segwit.
Py3 conversion by Marco Falke
Test to make sure upgraded nodes don't ask for non-wit blocks by
Gregory Sanders.
Adrian Gallagher