The part in question is the
STM32F205RET6 ARM processor which is easy enough to order up at the
usual s
ources.
Unfortunately,
counterfeit parts are
epidemic in the components industry today, and the incentive to spin up a "special" one of these is...rather large
Can't you trust the usual places to source you clean parts? Where do SatoshiLabs order their parts?
Now you are starting to think. THAT is a very good question. One would hope that they have a secure delivery arrangement with the manufacturer...one would hope...their website is mute on the subject.
This is where, despite its truly shamefully cheap physical implementation, the ledger is a cut above as it uses a proprietary, locked down
ST31H320 secure micro for the sensitive bit and the ARM just runs the display/buttons and USB.
You will note that that link goes to an adverpage, not a datasheet. There isn't one. This is a hardened, enterprise class part.