Audirvana and Roon can show the MQA Authenticity (Green for MQA, Blue for MQA Studio) right next to an MQA file.
I know that this is read-only info (can't be modified, and doesn't make sense to be modified) but still I think it's nice to be able to see it on screen.
I was wondering if something like this would be possible with Mp3tag?
Here's some more info: http://bobtalks.co.uk/blog/mqa-philosophy/mqa-authentication-and-quality/