comment: >
  
  For some records you need to prove it*
  For some categories they'll take your word for it if you're willing to just pay the fee
context: I'd love it if they actually sent him a certificate as the official record holder. >
  
  I think they usually need you to do a thing twice before they certify it. >
  
  That's not true. You do, however, have to have the attempt witnessed and follow strict rules on proving it.
  Source: Proposed a new record category to Guinness, had it approved, received the official rules, but never attempted the record.