The Greek State has created the website gov.gr which offers citizens an ever-expanding group of online services. Login to the gov.gr can be done via winbank credentials for the Solemn Declaration and Authorization services. So you can, easily and quickly, issue electronically, a valid solemn declaration and an authorization letter, without visiting a Citizens' Service Centre (KEΠ) or a police station, to certify the authenticity of your signature.
Here​ you can see in detail all the documents that you can issue online.

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