All TOTP secrets are stored in Invantive Keychain.
The contents of the Invantive Keychain are stored in an encrypted file `invantive-own-v2.keychain` located in `%USERPROFILE%\invantive`. Invantive Keychain uses the KDBX database format found with other password managers. The TOTP-accounts reside in a separate branch and can be exported and imported using Invantive Authenticator.
The data is encrypted using a user and device specific key. Therefore, the database can not be used on another device. Use the export/import options to easily transport accounts between devices.
Originally, Invantive Keychain used keys managed by Microsoft Windows, but these were deemed not reliable. As of 2023, the key management is provided by Invantive software.