Well that's an underwhelming solution.

IMO, OP made an error in the string then fixed it with hints. There was nothing in the puzzle to indicate that we should make that one letter uppercase. I was expecting an error might to happen during a step or two along the way due to complexity of some of the puzzles... but for us to get an error in the string that led to the private key? Wow indeed.

Several of us would have had this within an hour of it being posted if it had been correct. I used the correct cypher shifts (and a lot of wrong ones), I just didn't magically intuit to make one letter upper case.

All that said, I had a lot of fun during most of the run. It's had its ups and downs, but mostly ups.

See you on the flip side.