On the block recovery an easier way perhaps is to use the blockrecover corruption list

i.e.:

SQL> select * from v$database_block_corruption;

     FILE#     BLOCK#     BLOCKS CORRUPTION_CHANGE# CORRUPTIO
---------- ---------- ---------- ------------------ ---------
         5         12          1                  0 CORRUPT
         5       3068          2                  0 CORRUPT

RMAN> run
2> {
3> blockrecover corruption list;
4> }

....

Post recovery looking at the view corruption still shows?

SQL> select * from v$database_block_corruption;

     FILE#     BLOCK#     BLOCKS CORRUPTION_CHANGE# CORRUPTIO
---------- ---------- ---------- ------------------ ---------
         5         12          1                  0 CORRUPT
         5       3068          2                  0 CORRUPT

So try backup validate…..

RMAN> BACKUP VALIDATE DATABASE;

SQL> select * from v$recover_file;

no rows selected

SQL> select * from v$database_block_corruption;

no rows selected

Verfiy file is ok

DBVERIFY - Verification starting : FILE = /u02/oradata/crashdb/example01.dbf

DBVERIFY - Verification complete

Total Pages Examined         : 19200
Total Pages Processed (Data) : 8838
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 1279
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 7368
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 1715
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Highest block SCN            : 763674 (0.763674)