How to make digital signature of documents with blockchain?

Question

I am aiming to create a website that requires user to login, upload documents and sign them using blockchain (single sign or multiple signs) just like signatura or blocksign.

I have seen both of the websites and have a little bit idea how they work. But it's the technical picture that I am not getting.

So as an intermediate python develop, I have some question. Please answer.

1. Overall flow from after uploading a document to my website before downloading if successfully signed by all parties (Technically).

2. How to generate private and public keys and Will I store them alongside user information?

3. How to interact to blockchain api. I already gone through the api but nothing make sense to me.

Answer 1

The only reason why document storage is not advised on the blockchain is that when documents are stored in a blockchain network performance is significantly hampered and so is scalability. So what you can do is store your documents in a decentralized distributed file system such as IPFS and pass the reference to blockchain networks. In blockchain platforms like Ethereum, you can design and develop multi-signature wallets with the required consensus algorithm. Further, you can also invoke smart contracts using which you can operate around documents comprehensively.

You can learn more about Blockchain through Blockchain Certification Course by Intellipaat