Thread:Vektor0/@comment-832886-20160612135252/@comment-24057866-20160612181959

I'm fairly certain it's just a regular Cryptarch rank-up reward. I received it (it's equipped on my main right now) and I know I didn't decrypt 60+ engrams in one day.

I also searched online and didn't find anything about this method.

If you can find other people to test and corroborate your claims, we might have traction. But for now, I'm inclined to say you might have just witnessed RNG being RNG.