1 files changed, 11 insertions, 0 deletions
diff --git a/src/pow.cpp b/src/pow.cpp
index 50de8946be..6c8e7e5d98 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -134,8 +134,19 @@ bool PermittedDifficultyTransition(const Consensus::Params& params, int64_t heig
     return true;
 }
 
+// Bypasses the actual proof of work check during fuzz testing with a simplified validation checking whether
+// the most signficant bit of the last byte of the hash is set.
 bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params& params)
 {
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    return (hash.data()[31] & 0x80) == 0;
+#else
+    return CheckProofOfWorkImpl(hash, nBits, params);
+#endif
+}
+
+bool CheckProofOfWorkImpl(uint256 hash, unsigned int nBits, const Consensus::Params& params)
+{
     bool fNegative;
     bool fOverflow;
     arith_uint256 bnTarget;