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countersignature

['kauntə'sɪgnəʧə] сущ.
общ. contresignature f
Майкр. contre-signature f (A signature of an existing signature and message or a signature of an existing signature. A countersignature is used to sign the encrypted hash of an existing signature or to time stamp a message)
полит. contreseign m
юр. contreseing m