Allegedly, Ludo has fixed this, or at least https://lists.gnu.org/archive/html/guix-devel/2016-03/msg01039.html makes it sound like it :)
- bug#23103: A number of corrupt packages on Hydra? Christopher Allan Webber
- bug#23103: A number of corrupt packages on H... Pjotr Prins
- bug#23103: A number of corrupt packages ... Pjotr Prins
- bug#23103: A number of corrupt packa... Ludovic Courtès
- bug#23103: A number of corrupt packa... Christopher Allan Webber
- bug#23103: A number of corrupt p... Ludovic Courtès
- bug#23103: A number of corr... Leo Famulari
- bug#23103: A number of ... Pjotr Prins
- bug#23103: A number... Ben Woodcroft
- bug#23103: A number... Leo Famulari
- bug#23103: A number... Ludovic Courtès
- bug#23103: A number... Pjotr Prins
- bug#23103: A number... Ludovic Courtès