Do not use the redundant BestInvalidWork record in the block database.

As block index entries have a flag for marking invalid blocks, the
'best invalid work' information can be derived from there. In addition,
remove the global from main.h

1 files changed, 1 insertions, 5 deletions

diff --git a/src/txdb.cpp b/src/txdb.cpp
index 5e7b78296c..27d6caf4d9 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -74,13 +74,9 @@ bool CBlockTreeDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
     return Write(make_pair('b', blockindex.GetBlockHash()), blockindex);
 }
 
-bool CBlockTreeDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)
-{
-    return Read('I', bnBestInvalidWork);
-}
-
 bool CBlockTreeDB::WriteBestInvalidWork(const CBigNum& bnBestInvalidWork)
 {
+    // Obsolete; only written for backward compatibility.
     return Write('I', bnBestInvalidWork);
 }