Hello,
Safepal, Ledger, Trezor say they don't keep a backup of my 24 words and they will not transfer my 24 words to their servers.
Because I still need to connect the above hardware wallet through the app, PC, every time I need to use them.
This makes me worry they might store my 24-word recovery phrase is randomly generated by the device and displayed when during setup, and then they will be transferred to their server.
So how can I be sure they're not lying? Is there any way to check this?
By and large, you can inspect every TCP packet ( say with WireShark or other reliable packet sniffers) transferred from your computer to network to find whether they're lying or not. All it takes is the capture of correct packet and decrypt relevant string in it if any. Good luck in you endeavor.