Unsigned bills and its effects/consequences

Hi, I also have a similar view. Some information on this: 

It is important to note that the Information Technology Act, 2000 validates the electronic signatures only of the issuer has following reliable process (this process is mentioned in Section 3-A o the Information Technology Act, 2000),

(a) the signature creation data or the authentication data are, within the context in which they are used, linked to the signatory or , as the case may be, the authenticator and of no other person;

(b) the signature creation data or the authentication data were, at the time of signing, under the control of the signatory or, as the case may be, the authenticator and of no other person;

(c) any alteration to the electronic signature made after affixing such signature is detectable

(d) any alteration to the information made after its authentication by electronic signature is detectable; and

(e) it fulfills such other conditions which may be prescribed. 

An article on TMI on this subject - https://www.taxmanagementindia.com/visitor/detail_article.asp?ArticleID=9079 

Hope this is useful