FWIW, around a month ago I researched how to open a Turkish bank account in order to benefit from the high interest rate level by depositing some money there, but I had to give up. It seems to be hard to impossible for a non-resident.
(The OP talks about central bank rates and a recent increase, but consumer banks have had accounts with high rates (relative to other investment alternatives) for a long time. Just nowhere as high as this.)
Lira obviously. There used to be a Lira savings account scheme which was protected against FX risk by the government to encourage savings in Lira but I believe that's no longer offered.
turkish lira, venezuela month before a the hiper inflation and total default risk have 30% in dollars.
42% is dumb the inflation 42.5% so probably banks are making bucks here taking debt under inflation rate and lending over it, like happens in aregentina betwen 2008-2014.