Does Kraken require proof of address?

Could you please clarify for me if Kraken, as a cryptocurrency exchange platform, mandates its users to provide proof of address as part of their registration or verification process? I'm curious to know if this is a standard requirement in the industry, and if Kraken specifically has implemented such a measure to ensure the security and legitimacy of its platform. It would be great if you could also share any insights on how this process typically works and what kind of documents are usually accepted as proof of address.