IPFS in Ethereum Smart Contracts
This is a simple blog application that is a proof of concept of connecting Ethereum's smart contracts to JSON database stored on IPFS. The communication is based on Oraclize service.
How to run?
Prepare a blog contract
First you have to deploy a contract.
Here is an example how to deploy to Rinkeby testnet via infura node.
Set your mnemonic in wallet-config.json.
Run migrations:
truffle migrate --network rinkeby-infura --reset
You should see the address of the contract:
Blog: 0x461192ab19b0a963a77fdc8dea5ee9ac4287ff31
We have to set this address in app/blog/config/blog.json file.
Install IPFS
You have to have your own IPFS node that will store the database. Installation process is described here.
After installation we can run the daemon:
ipfs daemon
Run the server
Install npm dependencies:
npm install
and run the server
./node_modules/.bin/parcel app/index.html
Prepare blogposts
Each blogpost is stored in JSON object that consists of two attributes: title and content.
Let's prepare two blogposts.
echo '{"title":"Title of the first post", "content": "This is the awesome content!"}' > post_1.json
echo '{"title":"Title of the second post", "content": "This is the most awesome content!"}' > post_2.json
And we have to add them to IPFS as follows:
ipfs add post_1.json; ipfs add post_2.json
You should see two hashes (addresses) of the files:
added QmU2yr8CQfrd26Yghjx2xGdg8ZdmRKRSwcD7eBgpvL91xf post_1.json
added QmRPdMo8HEoSWSPXg1NxvLPcDNdL7YocvhXdYHjGQaXmfC post_2.json
You should be able to read the files by ipfs cat command or by a public gateway:
ipfs cat QmU2yr8CQfrd26Yghjx2xGdg8ZdmRKRSwcD7eBgpvL91xf
{"title":"Title of the first post", "content": "This is the awesome content!"}
curl http://ipfs.io/ipfs/QmU2yr8CQfrd26Yghjx2xGdg8ZdmRKRSwcD7eBgpvL91xf
{"title":"Title of the first post", "content": "This is the awesome content!"}
Keep the hashes for the next step.
Now we can add our blogposts using following command:
node scripts/add-blog-post.js <FILE_ADDRESS>
In our case:
node scripts/add-blog-post.js QmU2yr8CQfrd26Yghjx2xGdg8ZdmRKRSwcD7eBgpvL91xf
node scripts/add-blog-post.js QmRPdMo8HEoSWSPXg1NxvLPcDNdL7YocvhXdYHjGQaXmfC
Then you should see the link to your blog
Your blog is available here:
http://localhost:1234/#/u/0x351944e0d307d536737de4c6f07382548437fb53
Now we can open the link above and check if our blog works properly.
-
如何将JSON文件存储在IPFS上，并使用Oraclize访问智能合约中的数据呢？ 以太坊是一个成熟的区块链，使开发人员能够创建智能合约，在区块链上执行的程序可以由交易触发。人们经常将区块链称为数据库，但使用区块链作为数据存储非常昂贵。 以目前的价格（530美元，4gwei）在以太坊上存储250GB将花费你106,000,000美元。一般来说，我们可以忍受高成本因为我们： 不会在以太坊区块链上保存
-
如何将JSON文件存储在IPFS上，并使用Oraclize访问智能合约中的数据呢？ 以太坊是一个成熟的区块链，使开发人员能够创建智能合约，在区块链上执行的程序可以由交易触发。人们经常将区块链称为数据库，但使用区块链作为数据存储非常昂贵。 以目前的价格（530美元，4gwei）在以太坊上存储250GB将花费你106,000,000美元。一般来说，我们可以忍受高成本因为我们： 不会在以太坊区块链上保存
-
IPFS 是分布式文件系统，寻求连接所有计算机设备的相同文件系统。在某些方面，这很类似于原始的 Web 目标，但是 IPFS 最终会更像单个比特流群交换的 git 对象。 IPFS ＝ InterPlanetary File System IPFS 云成为一个新的、重要的网络子系统，如果构建得当，可以完善或者替换 HTTP，或者更多。 IPFS 结合了 Git，BitTorrent，Kademli
-
包含以太坊区块链相关的方法 示例： var eth = web3.eth;
-
eth-crypto Cryptographic javascript-functions for ethereum and tutorials on how to use them together with web3js and solidity. Tutorials Creating keys and use them for ethereum transactions In this tu
-
gomobile-ipfs This repo aims to provide packages for Android, iOS and React-Native thatallow one to run and use an IPFS node on mobile devices. It is also a placeto discuss the constraints of running
-
《IPFS与Filecoin 从入门到精通》 在接触 IPFS 之后，对这种可以本质上改变网络数据的分发机制的协议非常感兴趣，但由于目前国内并没有比较深入分析 IPFS 的书籍，而一些资料因为英文的缘故在一定程度上也为不少 IPFS 爱好者带来了一些学习上的困扰，不仅为了加快扩散 IPFS 爱好者的国内群体，决定以开源的形式完成这本《IPFS与Filecoin 从入门到精通》的书籍。 写作进度 开
-
ipfs-deploy Upload static website to IPFS pinning services and optionally update DNS. The goal of ipfs-deploy is to make it as easy as possible to deploy a staticwebsite to IPFS. Install Usage API Con