Passkey check

Sign a test challenge with this device's passkey and verify it on Whitechain's P-256 precompile.

This check signs a random challenge with a test passkey on this device and asks Whitechain's P-256 precompile (0x…0100) whether the signature is valid. It is the same verification your approver account uses.

Run the check

1. Choose Create test passkey. Test passkeys are separate from your approver passkey.
2. Choose Sign test challenge and confirm with your device.
3. valid shows true when the precompile accepted the signature.

Passkey signatures come DER-encoded, and about half of them use the "high" form of s. Tazor converts every signature to the low form before submitting it; raw was high-s shows whether this one needed it.