Can I get Customer ID from cookie?

Hello, I developed custom theme for only my shop.

I want add product review, But I worried about auth.

I know that shopify-liquid provide customer ID,

But It is raw-data. I want secured, or Encoded Data & Auth System.

So, I found [secure_customer_sig], but I can’t use this value. ( i want get customer ID from secure_customer_sig, in my product-review-stored-server )

Is there document about this case?

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