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"What I meant to say is that at the moment of signing, the signer of the
document must have a clear definition of what he/she is signing as it is
the signer that is using his/her private key to authorize some transaction."
But if we are talking about a subscription of shares: Subscriber
Explanation: Signatory - n., pl. -ries .A person who has a signed a document such as a treaty or an organization, state, etc., on whose behalf such document has been signed, ~adj. 2. having signed a document, treaty, etc.
THE COLLINS DICTIONARY AND THESAURUS
Sara Salvador Brazil Local time: 13:27 Native speaker of: Portuguese PRO pts in pair: 30