What is the differences between blue sign and green sign of MQA?

I am subscribing Tidal Hifi plan. I can see the 2 types of sign on the bottom when I am playing the same style file. Please let me know those differences.

Check this link http://bobtalks.co.uk/blog/mqa-philosophy/mqa-authentication-and-quality/
At Provenance chapter the answer to you question

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Thank you very much!!