“Certificate of authenticity” in Japanese
Short answer
Certificate of authenticity in Japanese is “折り紙” (origami). Full meaning: origami; hallmark, certificate of authenticity.
Other ways to say “Certificate of authenticity” in Japanese
裏書
uragaki endorsement (of a cheque, bill, etc.); verification of authenticity (written on the back of a scroll), certificate of authenticity; note written on the back of a scroll, comment
折紙
origami origami; hallmark, certificate of authenticity
おり紙
origami origami; hallmark, certificate of authenticity
おりがみ
origami origami; hallmark, certificate of authenticity
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