DNA-SHARING-CHAIN

Sample Dapp for the thesis "DNA-Sharing-Chain: A Privacy Preserving DNA Sequence Sharing Ecosystem".

Environment

• OS: Ubuntu 20.04.5 LTS
• Node: v20.11.1
• NVM: 0.39.1
• Ganache: 7.9.2 (@ganache/cli: 0.10.2, @ganache/core: 0.10.2)
• Truffle
  • Truffle v5.11.5 (core: 5.11.5)
  • Ganache v7.9.1
  • Solidity - 0.8.13 (solc-js)
  • Node v20.11.1
  • Web3.js v1.10.0
• Browserify: 17.0.0
• Metamask browser extension

Build

Decentralized Identity Chain (DID-Chain)

1. Install ganache & truffle

   npm install -g ganache

   npm install -g truffle

2. Build up ganache network

   ganache -s 0 --gasPrice 0 --blockTime 0.5 

3. Deploy smart contracts

   cd did_chain/

   truffle migrate

DNA Sharing Chain (APP-Chain)

1. Install fablo environment

   • Put the fablo script at /app_chain/.

2. Build up hyperledger fabric network

   cd app_chain/

   ./fablo up

   • To shut down the network

     ./fablo down

   • To clean all data

     ./fablo prune

     • You should do this after modifying chaincodes.

Dapp

1. Parse ABI files

   cd did_chain/

   node parse_abi.js

   • The ABI files (*.abi.js) will be generated at /app/public/javascripts/.

2. Bundle up packages

   cd bundle_files/

   npm install

   npm run build

   • The bundle files (*.bundle.js) will be generated at /app/public/javascripts/.

3. Start the Dapp

   cd app/

   npm install

   npm start

   • Open browser.

     • DID-Chain: http://localhost:3000/did
     • APP-Chain: http://localhost:3000/ or http://localhost:3000/app/

   • If you get an error like

     2024-07-06T12:46:53.547Z - error: [DiscoveryResultsProcessor]: parseDiscoveryResults[access-control-channel] - Channel:access-control-channel received discovery error:access denied...
     

     Delete the folder /app/routes/wallet/ and restart the system again.

Sample Data Generation (Optional)

Generate sample data in VCF format. Written in C++.

cd data_generator/

./data_generator.cpp <output_file_path> <record_number>

CSR and Private Key Generation (Optional)

Generate CSR and private key by OpenSSL.

openssl ecparam -name prime256v1 -genkey -noout -out key.pem

openssl req -new -sha256 -key key.pem -nodes -nodes -out key.csr

References

• Hyperledger Fabric Docs
• Hyperledger Fabric Contract API
• Hyperledger Fabric SDK for Node.js
• Hyperledger Fabric Offline Private Key Transaction Signing Flow
• Fablo
• Node.js Express Framework
• Solidity by Example
• Solidity Tutorial
• Ethereum Sign
• Ecrecover Example
• Truffle Test Tutorial