https://github.com/vutsalsinghal/off-chain-storage
Off-Chain data storage on Ethereum using IPFS
https://github.com/vutsalsinghal/off-chain-storage
blockchain django ethereum ipfs metamask ropsten solidity web3js
Last synced: about 1 month ago
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Off-Chain data storage on Ethereum using IPFS
- Host: GitHub
- URL: https://github.com/vutsalsinghal/off-chain-storage
- Owner: vutsalsinghal
- Created: 2018-06-28T01:07:23.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2018-08-07T19:08:49.000Z (almost 8 years ago)
- Last Synced: 2025-05-14T13:20:26.035Z (about 1 year ago)
- Topics: blockchain, django, ethereum, ipfs, metamask, ropsten, solidity, web3js
- Language: HTML
- Homepage: https://dapp.pythonanywhere.com/ipfsLink
- Size: 128 KB
- Stars: 1
- Watchers: 4
- Forks: 1
- Open Issues: 1
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Metadata Files:
- Readme: README.md
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README
# [Off-Chain-Storage](http://dapp.pythonanywhere.com/ipfsLink)
Web 3.0 apps (Ðapp) now-a-days need to store/retrieve data just like Web 2.0 (conventional/centralized) apps. But it is extremely costly (computationally and hence monetarily) to store data (> few bytes) for eg PDF, images, etc on EVM. The EVM allow us to save variables/state in permanent storage cheaply. So a possible solution to store large data is to save the data off-chain using options such as: [IPFS](https://ipfs.io/) and [Swarm](http://swarm-guide.readthedocs.io/en/latest/introduction.html). In this Ðapp, IPFS has been used for off-chain storage!
## Ðapp Preview
## Requirements
- (Use of virtualenv is strongly recommended!) `pip install requirements.txt`
- MetaMask [extension](https://metamask.io/)
- Remix - Solidity [IDE](https://remix.ethereum.org/#optimize=true)
## Deployment
- Create ethereum account using MetaMask. Make sure to choose "Ropsten Test Network"
- Request few ethers from the test [faucet](https://faucet.metamask.io/)
- Go to Remix solidity IDE and copy-paste the contents of opinion.sol file in the IDE.
- Click on "Start to compile" from the Compile tab in the top right corner.
- After compiling it, go to Run tab and click on "deploy". Metamask should bring up a popup asking you to confirm the transaction. If not, just open the Metamask extension and do it there.
- A message at the bottom of the Remix console will notify you when the contract is deployed. You can click on the link to explore the transaction on [ropsten.etherscan.io](https://ropsten.etherscan.io/). Note the contracts address!
- Download Django source code.
- Now open the root folder of the source code in terminal:
```bash
$ mkvirtualenv --python=python3 venv
$ pip install requirements.txt
$ ./manage.py makemigrations
$ ./manage.py migrate
$ ./manage.py runserver
```
- Now navigate to `localhost:8000/ipfsLink`