Does anyone know what secure element is in the bitkey?
It’s not a secure element. EFR32MG24
Bitkey replied on my Twitter. It's a "secure MCU". This is from https://www.ledger.com/ledger-101%25e2%2580%258a-%25e2%2580%258apart-2-why-hardware-wallets-are-secure There are two types of microcontrollers: the “normal” one used in your microwave, hobbyist drone or TV remote controller. It’s called a MicroController Unit or MCU in short. the “secure” one used in payment cards, SIM cards or passports. It’s called a Secure Element or SE. So it's just a microcomponentized computer.
Hope this helps https://bitkey.build/processing-our-processor-choice/