By signing in through Discord:

Your Discord login credentials will not be shared.

A unique numeric identifier will be shared with astrono.net. Through this, astrono.net will be able to identify your Discord account profile and access information about your Minecraft account from Astrono Link.

By signing in through Microsoft:

Your Microsoft login credentials will not be shared.

A unique numeric identifier will be shared with astrono.net. Through this, astrono.net will be able to identify your Microsoft account profile and and therefor access your Minecraft account identifier allowing us to identify who you are.