swswsw/secret-ballot

Secret Ballot example dApp

Blind Auction (Sealed-bid Auction) dapp

This dApp demonstrates ability to bid confidentially in a blind auction. In a blind auction, every bidders puts in a bid. Bidders do not know their fellow's bids. The highest bid winner is revealed when the auction ends.

To interact with this dApp locally follow the steps below.

Initial Setup

• Run npm install

• To modify the contract, run npm install -g truffle

Building & Deploying the Smart Contract

To build a new auction, run:

• truffle compile

You can deploy the contract with truffle. to do so:

• Edit truffle.js to add the mnemonic for your private key. This will be the address that deploys the smart contract; you must control this address if you want to end voting from the dApp!

• truffle migrate --reset --network oasis

Note the address of the deployed contract in the output

...
Saving artifacts...
Running migration: 2_deploy_contracts.js
  Replacing SecretBallot...
  ... 0x473e196528a48d27d5488dddf9bb8a351caa6bfe41a44b8e9fca0c935142db90
  SecretBallot: 0x1dd2838d8290dd83d5d060d1b3d2cc1eae0ac5f7

In this example the auction was deployed to address 0x1dd2838d8290dd83d5d060d1b3d2cc1eae0ac5f7

Interacting with the dApp

• Launch the local web server: npm run dev

• In your browser visit localhost:8080?ballot=<contract address>

Notes and Troubleshooting

• The smart contract code is available at contracts/confidential_SecretBallot.sol
• If you don't see anything in the web browser, ensure your Metamask is unlocked and configured for the Oasis testnet
• Due to rate limiting the web UI doesn't always display complete information. If the page doesn't fully populate you may need to wait a few seconds and refresh the page
• To change the auction options, edit migrations/2_deploy_contracts.js then re-deploy using the instructions above

This dapp is based on the secret-ballot dapp from https://github.com/oasislabs/secret-ballot