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1ceaf73df40e531df3bfb26b4fb7cd95fb7bff1d is the SHA-1 for a block of 4096 NULL bytes:

$ dd if=/dev/zero of=4k bs=4096 count=1
1+0 records in
1+0 records out
4096 bytes transferred in 0.000059 secs (69273666 bytes/sec)
$ sha1 4k
filename  size                    SHA1                  
4k  4096  1ceaf73df40e531df3bfb26b4fb7cd95fb7bff1d