[fosco]

what happens if you do not trust your smartphone? I do not like storing anything of value on mine.

not that it matters but I recently switched to LineageOS and my opinion has not changed.

[drexlspivey]

Apple does this with apple pay and the per device identifier is stored in the secure enclave (seperate chip that can create keys and sign data). The identifier can never leave the SE, requires Touch/Face ID to unlock and can be wiped remotely in case you lose your phone.