удостоверительной надписью, подтверждающей подлинность подписи на официальном документе

[freelancer_06]

4. Обращаю внимание, что апостиль должен быть в оригинале, а не в копии, так как апостиль является удостоверительной надписью, подтверждающей подлинность подписи на официальном документе (в данном случае выписки из торгового реестра).
Please note that the apostille shall be submitted in original (not in copy), as it is a certificate authenticating a signature on a formal document (in this case – confirming the authenticity of the Abstract of the trade register).
не подправите, плиз

[senin]

Please note: the original apostille has to be submitted (not a copy of it), as it is to certify the signature authentication on a formal document (in this case – confirming the authenticity of the trade register Abstract).

[langkawi2006]

Maybe Register of Commerce? In any case, should be spelled with capitals :-)

[сikimora]

....as it certifies the authenticity of the signature on a formal documents...?

[mahavishnu]

on a formal documents... - ?

[Alexis a.k.a. Althea]

Trade Register is fine.

Abstract/Excerpt FROM [the] Trade Register

Trade Register Abstract/Excerpt

Please note: Documents presented/submitted must bear original apostille for authentication of signature on an official document (in this case, Excerpt from Trade Register)

also consider:
... certifying authenticity of signature ...