Ipfs is a decentralized tool , it’s very suitable for ethereum.
We also use Smart Contract to store “data” in the etheruem blockchain.
Today , We use Smart Contract to store “data（ipfs hash）” , for the purpose of immutability .
IPFS
What’s IPFS ?
IPFS introduction from wiki
The InterPlanetary File System (IPFS) is a protocol and peer-to-peer network for storing and sharing data in a distributed file system. IPFS uses content-addressing to uniquely identify each file in a global namespace connecting all computing devices.
IPFS allows users to not only receive but host content, in a similar manner to BitTorrent. As opposed to a centrally located server, IPFS is built around a decentralized system of user-operators who hold a portion of the overall data, creating a resilient system of file storage and sharing. Any user in the network can serve a file by its content address, and other peers in the network can find and request that content from any node who has it using a distributed hash table (DHT).
Why we use ipfs ?
We know we can’t upload pictures on Ethereum, because uploading pictures on Ethereum has to pay a high gas fees.
We can upload the ipfs hash to Ethereum Blockchain .
How do we do ? Let’s go with our tutorial .
Tutorial
We will use Ipfs to upload the file and deploy the Hash (Ipfs generate) on the Ethereum blockchain .
First : Prepare List
1. Chrome
2. Metamask
3. Remix
4. IPFS Desktop / Extension- Chrome
Google Chrome is a good browser can use many extensions on it .
2. Metamask
Metamask is not only a ethereum wallet but a chrome extension .
3. Remix
Remix is a smart contract complier and we also use it to test our smart contract .
4. IPFS Desktop /Extension
mac : https://github.com/ipfs-shipyard/ipfs-desktop/releases/download/v0.10.2/ipfs-desktop-0.10.2.dmgwindows : https://github.com/ipfs-shipyard/ipfs-desktop/releases/download/v0.10.2/ipfs-desktop-setup-0.10.2.exe
Second : Write smart contract on Remix
if we install metamask on browser , and we change the network to Ropsten Testnet , and get the ether from faucet .
Faucet
You can get the ether from faucet.
Remix
- If you first use Remix , please click the solidity button in Eviroments.
2. Create a new file on FILE EXPLORERS and we named it “ipfs_inbox.sol” .
Code on it .
pragma solidity ^0.4.23;
contract ipfs_store {
string ipfsHash;
function sendHash(string x) public {
ipfsHash = x;
}function getHash() public view returns (string x) {
return ipfsHash;
}
}
3. Click the icon “SOLIDITY COMPILER” , and click compile ipfs_inbox.sol .
And you can see your contract ABI and Bytecode on it .
4. Change to DEPLOY & RUN TRANSACTIONS
- First : Switch Eviroments from Javascript VM to Injected Web3
- Second : Click the deploy button
- Third : If the contract success deploy , and we can see our contracts.
- Fourth : Write your IPFS Hash down .
But we didn’t upload our file on IPFS , so we must upload the file first .
Click Add Button to upload the file on IPFS .
We get the hash and paste it to the remix’s contract .
QmZRDUo9vTfMpZ3SHKDrtw1vm9X3dRiNVkkiXs5uCRriep
SendHash
getHash
We can see our file on ipfs , ipfs.io/ipfs/”your hash”
https://ipfs.io/ipfs/QmZRDUo9vTfMpZ3SHKDrtw1vm9X3dRiNVkkiXs5uCRriep
And you can see my photo — miner on IPFS .
Conclusion
IPFS is a good peer-to-peer applications , but it also have a problem about Speeds and peers too less .
If we want to see the anything on IPFS , we may wait too much time searching for files.
But IPFS solves a fundamental problem on the blockchain .
Too much content and pictures should not be on the blockchain .
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