This project should give people the opportunity to store snapshots of websites at a given time.
Organization: HTL Leonding
Project Title: Web Watch
Timeframe: N/A
Prepared By: Aichinger Niklas, Pavelescu Darius
To start using webwatch, you will need an account, so hit the "Sign-Up" button and create an account.
After you did that, visit the Sign-Up page again and click on the Log-in Button to log in.
After being logged in, you should visit "Save Website" from the navigation bar.
Paste the link in the "URL" input bar and click on the Submit button.
Wait patiently until you get redirected to the homepage.
After storing the website, you can easily access it by visiting the "Show Websites" menu from the navbar.
The actual Files are saved in PDF and HTML format on our servers to minimize the price that the user has to pay to store a website on the blockchain.
The next step is to create a unique Hash. The hash uses the MD5-Algorithm and it contains the HTML Code of the website and its URL.
The web3 Library lets us connect to the ethereum blockchain, but in order to connect to it, we would also need a Node, which is running in the blockchain. The Infura API helps us with this problem by allowing us to use their Node to Deploy Contracts in the ethereum network.
The hash is then stored in the blockchain and it is linked to the user that requested the snapshot. When the user wants to see the website, we use the same algorithms to hash the HTML code thats stored on our servers. If the calculated hash is the same as the hash that’s stored on the blockchain, it means that the files did not change. The user becomes 2 links. One leads him to the PDF and the other one to the HTML.
By using blockchain we are guaranteed that everything thats saved is unchangeable/ undeleteable. Which in our case will be hashes of a website. The website source code will be stored on our servers to reduce cost.
We will have meetings where we discuss new features, which we then implement together or alone. After every feature, the code will be pushed to github from where the next member of the project can continue to work.
- ethereum blockchain
- bootstrap
- nodejs
- web3 - Access blockchain from nodejs.
- Infura API - Node on the eth blockchain.
As mentioned in the aproach, we will have online meetings, a call of some kind or via chat. After we discussed how we will implement certain changes, we use visual studio code live share to work together on the same change or we will decide who will implement the change. After the change is finished the member/members who worked on the change will then proceed to push the code to github.
Red – User sends the request to store website from URL to the Node Application
Yellow – Node App then sends a request to TCP Hash Verification Server (HVS) to verify the HASH
Green – HVS Send Request to Hash Verification Clients (HVC) to calculate HASH
Cyan – HVC reply with the calculated HASH
Blue – HVS sends the most frequent HASH back to the Node Application
Node App compares his own hash with the received one and adds it to the blockchain if they are equal.