Ethermint private network

Instructions on how to setup an ethermint private test network with tendermint consensus engine for development.

Requirement

• Geth
• Ethermint
• Tendermint

Initialize local test network

Before you can run ethermint you need to initialize tendermint and ethermint with their respective genesis states:

> bin/init

This script will create the following accounts:

[{
  address: '0x7eff122b94897ea5b0e2a9abf47b86337fafebdc',
  ether: 200000,
  password: '1234'
},
{
  address: '0xc6713982649D9284ff56c32655a9ECcCDA78422A',
  ether: 50,
  password: '1234'
},
{
  address: '0x6719e3c6d1b277272c2e898acdffa493d16e0bf1',
  ether: 40,
  password: '1234'
},{
  address: '0xde1bdda8c41f379bd4c19059b1bd94a5d32935d1',
  ether: 30,
  password: '1234'
},{
  address: '0xdf55b36ab1c553140dcab9ffe3224621ff8db027',
  ether: 20,
  password: '1234'
},{
  address: '0xd988a5f1ab876f2500e6c5b8e26ba2fdcd108fda',
  ether: 10,
  password: '1234'
},
},{
  address: '0x2ff3d7c646cbfd82eb880834a1316076af0b635f',
  ether: 0,
  password: '1234'

},{
  address: '0xd1f9fd5bf8eb0cecd5339ae7a85897364517051e',
  ether: 70,
  password: '1234'
}]

Start tendermint

Before running ethermint you need to start tendermint node:

> bin/tendermint

Start ethermint

After running tendermint, start ethermint in another shell with this command:

> bin/ethermint

Start tendermint-lite

To run tendermint lite client run this command:

> bin/lite

Attach geth

You can interact with the ethermint network by attaching geth to your node:

> bin/geth

This will present a javascript console where you can run various commands.

Send tokens

Form the console attached to your ethermint node, you can send ether from one account to another. First we check the balances of the from and to accounts:

> var from = web3.eth.accounts[1]
> personal.unlockAccount(from, '1234')
> web3.eth.getBalance(from)
20000000000000000000
> var to = web3.eth.accounts[2]
> web3.eth.getBalance(to)
10000000000000000000

Now we send ether:

> eth.sendTransaction({from: from, to: to, value: 1})
"0x9374959bdab5874d71a34531eccd7aa9755c2dd2293c148d3acc4ddfcbc29f8b"

If you check the ethermint node console, you will see this transaction logged:

Submitted transaction fullhash=0x9374959bdab5874d71a34531eccd7aa9755c2dd2293c148d3acc4ddfcbc29f8b recipient=0xd988a5f1ab876f2500e6c5b8e26ba2fdcd108fda

Now you can check the balances of the from and to account to verify that ether was moved:

> web3.eth.getBalance(from)
19999621999999999999

NOTE: The reason more than 1 is gone from the ether balance is because it costs ether to execute the send ether transaction. This transaction fee is given to the validator.

> web3.eth.getBalance(to)
10000000000000000001

Deploy the greeter contract and call the greet method

From the attached console, you can deploy the greeter smart contract and use it:

> loadScript('deploy.js');

If you check the ethermint node console, you will see this transaction logged:

Submitted contract creation fullhash=0x2b20a7955bdedcad94864bdfaffac672c80662cd3dbfbdbeabbcde8c3c8fd291 contract=0xb6b29ef90120bec597939e0eda6b8a9164f75deb
Submitted contract creation fullhash=0xb38954a16324fb573efa794947be4d0866f0937924c6d1b7962e1e88a069b4bc contract=0x70f94d58cc3fdcbeac7140f35a087da9fcd09b94

Now you can read the storage variable in deployed contract by this command.

> greeter.greet();
"hello private test network"

NOTE: The contract in deploy.js is the default contract displayed in the online solidity compiler