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Fix fresh sync failure at diff reset height 2838976

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Fresh-syncing nodes rejected the on-chain min-diff block at the
RANDOMX_VALIDATION activation height (2838976) because GetNextWorkRequired
computed the expected nBits from the preceding normal-difficulty blocks,
producing 469847994 instead of the on-chain 0x200f0f0f (HUSH_MINDIFF_NBITS).
This caused all seed nodes to be banned with "Incorrect diffbits" and the
node could never sync past that height.

Two changes:

1. GetNextWorkRequired (pow.cpp): Return nProofOfWorkLimit at the exact
   RANDOMX_VALIDATION activation height, matching the on-chain diff reset.

2. ContextualCheckBlockHeader (main.cpp): Raise DragonX daaForkHeight to
   RANDOMX_VALIDATION + 62000, covering the window where nBits was never
   validated (diff reset at 2838976 through the attack at ~2879907).

Tested by invalidating block 2838975 and reconsidering — node re-validated
through the diff reset and attack window, syncing back to tip with zero
bad-diffbits rejections.

Bump version to 1.0.1.
This commit is contained in:
DanS
2026-03-12 01:25:21 -05:00
parent 6d56ad8541
commit f0cb958cac
5 changed files with 21 additions and 4 deletions
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2
configure.ac
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@@ -3,7 +3,7 @@ AC_PREREQ([2.60])
define(_CLIENT_VERSION_MAJOR, 1)
dnl Must be kept in sync with src/clientversion.h , ugh!
define(_CLIENT_VERSION_MINOR, 0)
define(_CLIENT_VERSION_REVISION, 0)
define(_CLIENT_VERSION_REVISION, 1)
define(_CLIENT_VERSION_BUILD, 50)
define(_ZC_BUILD_VAL, m4_if(m4_eval(_CLIENT_VERSION_BUILD < 25), 1, m4_incr(_CLIENT_VERSION_BUILD), m4_eval(_CLIENT_VERSION_BUILD < 50), 1, m4_eval(_CLIENT_VERSION_BUILD - 24), m4_eval(_CLIENT_VERSION_BUILD == 50), 1, , m4_eval(_CLIENT_VERSION_BUILD - 50)))
define(_CLIENT_VERSION_SUFFIX, m4_if(m4_eval(_CLIENT_VERSION_BUILD < 25), 1, _CLIENT_VERSION_REVISION-beta$1, m4_eval(_CLIENT_VERSION_BUILD < 50), 1, _CLIENT_VERSION_REVISION-rc$1, m4_eval(_CLIENT_VERSION_BUILD == 50), 1, _CLIENT_VERSION_REVISION, _CLIENT_VERSION_REVISION-$1)))