This is the Proof-of-Work difficulty, not the Proof-of-Stake difficulty. There are no other PoS coins that use up-to-date Bitcoin source code as their code base. Most are clones of Blackcoin which is based off of ancient code (Bitcoin version 7-8). Emercoin was the first to make progress in this arena with their use of code from Bitcoin v0.10 and some of it close to v0.11, but much of Emercoin's code is incomplete, and/or does not function correctly. Emercoin hit the jackpot and went corporate and their codebase is pretty stale now, but they provided a great base for us to work on improvements. Silk's codebase is almost entirely up to date with Bitcoin v0.12 code. We have taken this even further and we have fixed the PoS functionality that separated the inner workings of the code and our ability to actually see it. In the next release we will not only have fixed the issues with the staking icon and getstakinginfo, but we will have more advanced statistical analysis tools with both graphical and csv formats (as well as RPC commands. Thank you to presstab for providing much of the inspiration and initial code for PoS blockchain analysis.

But, to answer your question, I have replaced the PoW difficulty calculation with the PoS difficulty.

To get a preview of the more advanced analysis tools take a look here: https://github.com/SilkNetwork/Silk-Core/pull/89. We have also added the ability to calculate your staking profits with a simple dropdown window on the Transactions tab. User defined reports and graphs are in the works now for custom blockchain analysis and presentation tools right in your wallet. Lots of improvements on the way or already here! I want Silk to be the most advanced and analytical PoS wallet, but also the most intuitive and user friendly. This next release will be a very big step in that direction.

Pics or it didn't happen