Are there any publicly available usage statistics for Real URL/SXG?

I’d like to develop a system which cryptographically attributes content to websites using their Real URL/SXG metadata. I’m wondering how much cached mobile web traffic currently attests to its origin using SXG (basically, how useful such attribution capability would be). I’m having trouble finding good sources, or even a way to measure it, and I’d be grateful for any pointers.

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