Fix/Improve Sign In Method

Description

Improve Sign In Functionality, Add required method to smart contract.

YT Link - https://www.youtube.com/watch?v=9o-lE39xtts

Fixes # (issue)

Type of change

Please mark the options that are relevant.

• Updated UI/UX
• Improved the business logic of code
• Added new feature
• Other

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings