Thanks for this list.  really useful to me right now.

I'm presently trying to implement a tool that can read in an XPub and then find all the addresses that have ever been used, both receive and change.  for auditing/accounting purposes.

I quickly found that a) not all HD wallets export the xpub (eg multibit) and b) wallets are exporting the XPub from non-standard paths eg mycelium.

I don't understand why it is so hard for wallet authors to simpy follow the Bip32 spec as written.  This is people's money we are talking about.  Did we learn nothing from the browser wars?   Are they doing this specifically to waste my time investigating?  sure feels like it....

ok, so to my question:    Given only an xpub and no additional info about where it came from, is it possible to determine what location it should be at in the path?     Basically my code needs to be 100% certain that it is generating the correct addresses, and also that it can find both receive and change addresses.

And for those wallets that do not allow exporting the xpub at all.... really?   seriously?   Exactly whose money do you think it is?  What alternative mechanism do you provide that enables 3rd party auditing/accounting?   oh really, none?   yeah, that's what I thought.