Exclude producer_signature from block id

libraries/chain/block.cpp

@@ -21,7 +21,8 @@ namespace eosio { namespace chain {
 
    block_id_type signed_block_header::id()const
    {
-      block_id_type result = fc::sha256::hash(*this);
+      // Do not include signed_block_header attributes in id, specifically exclude producer_signature.
+      block_id_type result = fc::sha256::hash(*static_cast<const block_header*>(this));
       result._hash[0] &= 0xffffffff00000000;
       result._hash[0] += fc::endian_reverse_u32(block_num()); // store the block num in the ID, 160 bits is plenty for the hash
       return result;