I fell into this rabbit hole when trying to just write some hobby stock tracking stuff, it sucks. ISINs seemed decent but I couldn't find an open source of data

I fell into this rabbit hole when trying to just write some hobby stock tracking stuff, it sucks. ISINs seemed decent but I couldn't find an open source of data about them. Lots of legacy fragmentation in this space and everyone is trying to take your money if you so much as look at them