Not sure I follow cryptopia's message blaming leveldb. Signatum seems to be using 1.17 (https://github.com/signatumd/source/blob/master/src/leveldb/Makefile), only 1 minor version behind what is stable in most OS (Debian, Gentoo, Fedora, Suse, Ubuntu...). I can't believe it would be that hard to update to 1.18 (used by Dash for exemple). Maybe I'm missing something... can't say I ever used leveldb.