RD I see little reason doing that as long as I have received no e-mail from mycow detailing the information I should provide (which verticals or tokens). I received such information regarding the W-8BEN I have sent. I am prepared for a reduced transfer of money because of taxes withheld in the USA. To me it looks somewhat arbitrary which the "dividend" is related to. I just have two sorts of tokens in my digital wallet. I think I have sent the W-8BEN for those.
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