This may be jumping the gun but does anyone know how the "half custodian" approach for splitting SegWit2x coins that's mentioned in this Ledger blog post will work?
The relevant text from the blog post is:
The “half custodian” process will involve a new Ledger application created for the Nano S and Blue (it will not be available on Ledger Nano) and will be fully automated. We’ll make available tainted inputs to our users with a contract enforced by the new application that sends back those tainted inputs to us — this is possible because our secure applications distribution architecture allows to securely share a set of keys with our users without revealing it. In other words, our splitting app will take care of everything automatically and with the highest levels of security.
What's a tainted input and a contract enforcing application?