Quorum

Quorum is a private/permissioned, blockchain based on the official go implementation of the Ethereum protocol. Quorum client is a forked version of Ethereum’s Geth.

Quorum focuses on privacy, unlike Ethereum mainnet which reveals all of its transactions in the clear, Quorum enables private transactions. Quorum also relies on a vote-based form of consensus.

Install

The simplest and fastest way to setup an instance of Quorum is to use ConsenSys Quorum Network Manager (you can find a single script setup option here)

Once your Quorum chain is up and running, identify the IP address of one of its running nodes. Quorum Network Manager returns an enode address ending in an address IP as in this example:

enode: enode://71809a795b94d24f0b0cfa2fbd8361ce055f4feb710e6a65614767cd72ed8ecd1bae155c141e097bc74f44dc53cbfc308f3db703283c200eb3b40a8a77e92e82@67.247.25.158:20000?raftport=40000

Connecting to Quorum

Add the Nethereum.Portable nuget package and the “Using” statement to use Nethereum’s Quorum and Web3.

#r "Nethereum.Portable"
using Nethereum.Quorum;
using Nethereum.Web3;

Then set a Web3 instance using your node’s IP address and 20010 as port (if you are using Quorum Network Management):

var web3Node1 = new Web3Quorum("http://46.165.246.181:20010");

Querying with Quorum

Creating an account

var newAccount = await web3Node1.Personal.NewAccount.SendRequestAsync("password");

Retrieving an account balance

var balance = await web3Node1.Eth.GetBalance.SendRequestAsync("0xe68bf709a914d3a027d3d90686a3b975c3b82379");

Retrieving existing accounts

var accounts = await web3Node1.Eth.Accounts.SendRequestAsync();

Privatefor

The privateFor parameter causes Quorum to treat a transaction as private. PrivateFor can take multiple addresses in a comma separated list, those addresses will be the only ones allowed to access private transactions in the clear. Those not on the list will simply skip private transactions.

PrivateFor will be set as following:

var web3Node1 = new Web3Quorum(urlNode1);
var privateFor = new List<string>(new[] { "ROAZBWtSacxXQrOe3FGAqJDyJjFePR5ce4TSIzmJ0Bc=" });
web3Node1.SetPrivateRequestParameters(privateFor);

Afterwards all the transactions will use the PrivateFor parameter.

var contract = web3Node1.Eth.GetContract(abi, address);
var functionSet = contract.GetFunction("set");
var txnHash = await transactionService.SendRequestAsync(() => functionSet.SendTransactionAsync(account, 4));