These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/jansson-2.15.1:0/4::gentoo  USE="-doc -static-libs" 478 KiB
[ebuild  N     ] dev-libs/libbase58-0.1.4-r2::gentoo  USE="-test -tools" 7 KiB
[ebuild  N     ] net-libs/libblkmaker-0.6.0-r2:0/7::gentoo  USE="-test" 29 KiB

Total: 3 packages (3 new), Size of downloads: 513 KiB