Well, it's been quite intense five weeks of learning, codding, experimenting and debugging, and now my project is open for judges on a test Ethereum network (Goerli).
Not everything is working ideal but that's why I called it Beta and added a disclaimer to the footer of the app page.
The hackathon rules required to record a 5-minute demo video which I published on the project page https://devpost.com/software/marrysign
Now fingers-crossed 🤞
P.S. If my idea resonates with you, please Like the project on Devpost. I'd appreciate any support.