libzck1 1.2.3+ds1-1 (amd64 binary) in ubuntu lunar

 zchunk is a compressed file format that splits the file into independent
 chunks. This allows one to only download changed chunks when
 downloading a new version of the file, and also makes zchunk files
 efficient over rsync.
 .
 zchunk files are protected with strong checksums to verify that the file
 downloaded is, in fact, the file desired.
 .
 This package contains the shared library.