Mining Ethereum (locally)

I setup my own Ethereum-based blockchain this morning and mined some ether. I created two accounts (wallets) and passed Wei (ether “pennies”) back and forth to each other and performed mining in-between to verify the transactions (aka move the money).

  1. Download geth
  2. Unzip it
  3. Initialize geth using this genesis.json file (strip the .zip extension off the filename)

geth –datadir=./datadir init genesis.json

4. Create an account:

geth –datadir=./datadir account new

5. Start the java console:

geth –datadir=./datadir console

Mine some ether!

miner.start(1)

INFO [01-23|11:45:55] Updated mining threads                   threads=1

INFO [01-23|11:45:55] Transaction pool price threshold updated price=18000000000

null

> INFO [01-23|11:45:55] Starting mining operation

INFO [01-23|11:45:55] Commit new mining work                   number=1 txs=0 uncles=0 elapsed=88.981µs

INFO [01-23|11:46:04] Generating DAG in progress               epoch=0 percentage=0 elapsed=7.167s

INFO [01-23|11:46:11] Generating DAG in progress               epoch=0 percentage=1 elapsed=14.543s

INFO [01-23|11:46:18] Generating DAG in progress               epoch=0 percentage=2 elapsed=21.008s

INFO [01-23|11:46:24] Generating DAG in progress               epoch=0 percentage=3 elapsed=27.073s

INFO [01-23|11:55:54] Generated ethash verification cache      epoch=0 elapsed=9m57.721s

INFO [01-23|11:56:00] Successfully sealed new block            number=1 hash=9c9452…2b3045

INFO [01-23|11:58:51] 🔨 mined potential block                  number=18 hash=c0b3d4…823d41

INFO [01-23|11:58:51] Commit new mining work                   number=19 txs=0 uncles=0 elapsed=205.898µs

INFO [01-23|11:58:52] Successfully sealed new block            number=19 hash=8940d2…e026a6

INFO [01-23|11:58:52] 🔗 block reached canonical chain          number=14 hash=e08f17…b69966

INFO [01-23|11:58:52] 🔨 mined potential block                  number=19 hash=8940d2…e026a6

INFO [01-23|11:58:52] Commit new mining work                   number=20 txs=0 uncles=0 elapsed=116.913µs

miner.stop()

You should have some ether in your wallet now!

Check your balance:

eth.accounts

get string

eth.getBalance(“paste string”)

or to see balance in ether:

web3.fromWei(eth.getBalance(eth.accounts[0]), “ether”)

240

Create a second wallet:

personal.newAccount(“abc123”)

Make sure the new wallet exists:

> eth.accounts
[“0x28a3a7967d16e51b3a38c7ae12c9e036472e07ad”, “0x2765108503bbda744203d8c9d3d744 c355f2453d”]

Move 100 from wallet “0” to wallet “1”:

Unlock the sending wallet first:

(personal.unlockAccount(eth.accounts[0], “password_for_wallet“)

Send 100 ether:

eth.sendTransaction({from: eth.accounts[0], to: eth.accounts[1], value: web3.toWei(100, “ether”)})

Performed some more mining to move the money (verify)

> miner.start(1)

INFO [01-23|12:17:30] Updated mining threads                   threads=1

INFO [01-23|12:17:30] Transaction pool price threshold updated price=18000000000

null

INFO [01-23|12:17:30] Starting mining operation

INFO [01-23|12:17:30] Commit new mining work                   number=49 txs=1 uncles=0 elapsed=269.401µs

INFO [01-23|12:17:37] Successfully sealed new block            number=49 hash=cdd60d…09413f

INFO [01-23|12:17:37] 🔗 block reached canonical chain          number=44 hash=4f6fd6…898d8a

INFO [01-23|12:17:37] 🔨 mined potential block                  number=49 hash=cdd60d…09413f

INFO [01-23|12:17:37] Commit new mining work                   number=50 txs=0 uncles=0 elapsed=135.258µs

> miner.stop()

Check balances:

> web3.fromWei(eth.getBalance(eth.accounts[0]), “ether”)

155 (note 15 additional coins from mining work to vfy txn!)

> web3.fromWei(eth.getBalance(eth.accounts[1]), “ether”)

100

Voila!

Transaction details:

> eth.getTransaction(“0xef3f9391e569ff205768d3e27bf7cf73308c5e8de0859b4e8fe096c26ba53”)

{

blockHash: “0xcdd60d0b3722adc0fba3c4956a02f8e6120b717371d335f6ae6849a09413f”,

blockNumber: 49,

from: “0x28a3a7967d16e51b3a38c7ae12c9e036472e07ad”,

gas: 90000,

gasPrice: 18000000000,

hash: “0xef3f9391e569ff205768c68d3e27bf7cf73308c5e8de0859b4e8fe096c26ba53”,

input: “0x”,

nonce: 0,

r: “0xf5981cbee6da86dc162787a8814d8dc30a874f3777228cdc1d03a20de10776b2”,

s: “0x7e3606f0e791493e166212dbec20161aa0aa6cec594bfb82214ed91cb000ff”,

to: “0x2765108503bbda744203d9d3d744c355f2453d”,

transactionIndex: 0,

v: “0xed”,

value: 100000000000000000000

}

 

Block details:

> eth.getBlock(“0xcdd60d0b22adc0fba3c4956a02f8e64ed120b717371d335f6ae6849a09413f”)

{

difficulty: 131072,

extraData: “0xd7830107038467657487676f312e392e32856c696e7578”,

gasLimit: 329424,

gasUsed: 21000,

hash: “0xcdd60d0b3722adc0fba3c4956a02f8e64ed120b717371d335f6ae6849a09413f”,

logsBloom: “0x0000000000000000000000000000000000000000000000000000000000000000                                                                                                                                                             00000000000000000000000000000000000000000000000000000000000000000000000000000000                                                                                                                                                             00000000000000000000000000000000000000000000000000000000000000000000000000000000                                                                                                                                                             00000000000000000000000000000000000000000000000000000000000000000000000000000000                                                                                                                                                             00000000000000000000000000000000000000000000000000000000000000000000000000000000                                                                                                                                                             00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000”,

miner: “0x28a3a79d16e51b3a38c7ae12c9e036472e07ad”,

mixHash: “0x52f1d43a0d0f20de558ae892bd0be8d4f39231f73569a03a70d9274be9f475”,

nonce: “0x736267a32012d9”,

number: 49,

parentHash: “0x823fe9ab5c194169a5321193bbe61357cf56f958ed77f5d23ad9018b0b602b”,

receiptsRoot: “0xb91d6e796beda886fc0ea068b01d824a2a57f9ab48457046c3410feeaa0198”,

sha3Uncles: “0x1dcc4de8dec75d7aab85b567ccd41ad312451b948a7413f0a142fd40d49347”,

size: 651,

stateRoot: “0xfdc68f56dfd304be1405ccecc0f25eb70b5db2bf78f173e12022dbbd39bf20f9”,

timestamp: 151672750,

totalDifficulty: 644896,

transactions: [“0xef3f9391e569ff205768c68d3e27bf7cf7335e8de0859b4e8fe096c26ba53”],

transactionsRoot: “0x356c5cacb2a696f43a194473badaa8fa5ec1c2fef6e0e1b9cc341e569ec1”,

uncles: []

}

This is step one for creating my own DAPP.  Hopefully this helps you.

If you have any questions, comments, or suggestions, let me know.

Thanks!

The Jeep Story – Lift Kit

Clearance! We needed more ground clearance. The curb at our house was nearly as tall as the bottom of the stock sliders. We wanted to install some nice big 35″ mud terrain tires. There were a couple of options. Get some bigger fenders and some leveling blocks or take the dive (aka spend the money) and get all new springs and shocks with a lift kit. We wanted to do it the right way so we decided on the “lift kit” route. I started doing some research. I visited a couple of shops around my area and felt like I was just being pushed to buy their vendor of choice. JKS here, ProComp there…I didnt like it.

After days of perusing the internet, I decided on a company called American Expedition Vehicles (AEV). They have a long reputation of making quality OEM fit and finish parts for Jeeps and Rams. More importantly, they do a lot of B2B sales. In fact, Jeep themselves called on AEV to provide bumpers for certain special editions (MW3) that rolled off the factory floor. Another nice part about the AEV kit is that it came with everything needed to properly lift the Jeep without changing the ride too much. Cheap lift kits can be a nightmare, cause bump steer, and just generally be unsafe at speed. Since my wife and kids were going to be in here primarily, I didnt want to take any chances. The AEV DualSport RS kit was roughly $2500 bucks and it included a set of Bilstein 5160 shocks with remote reservoirs. It provided 3.5″ of lift and plenty of clearance for the 18″ Method Vex wheels wrapped in 35″ Toyo Open Country MT (Mud Terrain) tires.

This is what it looked like when we brought her home from the shop.

We were happy with our decisions and were ready to get it ready for some off-roading and overland adventures!