5c3eb80066420002bc3dcc7ca4ab6efad7ed4ae5
From Forensics Wiki
5c3eb80066420002bc3dcc7ca4ab6efad7ed4ae5 is the SHA1 of a block of 512 NULL bytes:
$ dd if=/dev/zero of=512b bs=512 count=1 1+0 records in 1+0 records out 512 bytes transferred in 0.000054 secs (9502140 bytes/sec) $ sha1 512b filename size SHA1 ======================================================== 512b 512 5c3eb80066420002bc3dcc7ca4ab6efad7ed4ae5