Mining, cryptocurrencies, Ethereum blockchain, crypto trading platforms (here's how to build one, by the way) - this whole relatively new blockchain thing caught my eye a few years ago and the interest only kept increasing.
I'm saying 'relatively new' because even though the actual concept was devised in 1991, the first practical implementation was effected in 2008 by the elusive Satoshi Nakamoto.
With this brief history behind us, we will focus on the second publicly available blockchain, Ethereum (a more flexible and robust implementation of the concept).
It’s going to be a 4-part series covering the workshops I'm running for my local developers community at FullStack Cluj within the following weeks:
- FULL CODE - Scan private key Ethereum blockchain with Javascript SCAN PRIVATE KEY WITH BALANCE JS FULL CODELESSON 11 - CryptoCurrency PRIVATE KEY FINDER ET.
- ∟ Ethereum Account Keystore File. This section describes the keystore file that contains the private key of an Ethereum account. An Ethereum account keystore file is JSON file, that stores the private key of an Ethereum account. We can use the importRawKey function on the 'geth' JavaScript console to create keystore file from a private key.
Every account is defined by a pair of keys, a private key and public key. Accounts are indexed by their address which is derived from the public key by taking the last 20 bytes. Every private key/address pair is encoded in a keyfile.Keyfiles are JSON text files which you. This will generate a pair of password-protected public/private keys inside the /keystore folder. By default, Ethereum will store everything inside the folder except for the PoW Ethash DAG. Geth account new -datadir If datadir parameter is not provided, the default paths for will be used. Use Export to save the private keys to a.wl file for later use. Use GenerateAsymmetricKeyPair to create an Ethereum key pair to be used for sending and receiving ether: Encode the keys. Use BlockchainKeyEncode to derive a unique new Ethereum address from the public key: The public key is used for sending ether.
- Build Your Own Private Ethereum Blockchain with Geth
- Build Your Own Private Ethereum Blockchain with Parity
- Setup Proof of Authority Consensus on Private Ethereum Blockchains
- Automate Blockchain Creation with Puppeth.
So let’s get this going.
First off, we need to install Geth which is one of the 3 original implementations (Go, C++ and Pyhton) of the Ethereum protocol.
To install geth on Mac OS X, we assume you already have Homebrew on your machine. In case you don't, follow this link.
Installing geth on Ubuntu is as straightforward as installing any other package.
And for Windows, you can follow this link.
We will now create 2 accounts, one that we'll seed at genesis and another one we'll use for the miner.
To do so, we will run the following command twice and it will ask for a passphrase on each run.
Under no circumstance should you forget the passphrase you're going to set.
This will generate a pair of password-protected public/private keys inside the <data-dir>/keystore folder. By default, Ethereum will store everything inside the <data-dir> folder except for the PoW Ethash DAG.
If datadir parameter is not provided, the default paths for <data-dir> will be used.
- Mac: ~/.ethereum
- Linux: ~/.ethereum
- Windows: %APPDATA%Ethereum
From this point on, consider the following addresses as the ones generated above.
- seed
0x6d5da05a98f04de068418051512f3e965ee8dfca - miner
0x632d167d2eef0f7c1fa37fcc4777d26fe6df944b
The genesis block is what differentiates between all the Ethereum blockchains. Being the first block in the blockchain and having no reference to a previous one, this block is unique in its own way.
Inside the <data-dir> folder we will create a file called genesis.json with the following content:
config
- chainId - this is your chain identifier, it can be any number at random and it will be used in replay protection.
- homesteadBlock, eip155Block, eip158Block, byzantiumBlock - these represent the versions of the blockchain. Since we will start from scratch, all the changes in these versions will be available starting with block 0.
difficulty
This property dictates how hard is to mine a block by directly influencing the nonce applied in the discovery process.
gasLimit
This represents the maximum ammount of gas used on each block. Due to the low mining difficulty we set for the genesis block above, we still want the gas limit pretty high so we don't hit it. This way, we avoid slowing the network.
aloc
In this section we prealocate Ether to the specified accounts. Heads up: this will not create the addresses, you should already have them.
So far, we installed all the prerequisites and configured the node, now the real fun begins.
1. Instantiate The Data Directory
If everything went ok you should have an output similar to this:
2. Start The Node
The networkId we set in the genesis block helps ensuring your network privacy. If other peers want to join your network, they will have to use the same networkId.
The output should be similar to this:
How to pirate fl studio. Since we created the accounts with geth inside the same <data-dir> folder and we allocated some Ether in the genesis block to one of the addreses, it was already set as the main account for this instance of the node.
Thus, we can do something like this:
Generate Ethereum Private Key Javascript Online
3. Start Another Peer
On the same machine we will start another peer for the miner and for this step we'll create a new <data-dir> (let's call it <peer-data-dir>), copy the miner private key generated above inside the keystore folder, and then start a new peer.
We will then initialize the data dir.
Then start the second peer.
The output should be similar to the one we had above, the difference being the default address which should be the miner one.
4. Connect Peers Together
To connect the peers together we require the enode address of the first peer. To get this, in the console of the initial peer we run:
This should return something like:
With this information we run in the console of the second peer:
5. Start The Miner
Checking the initial balance of the miner account should return 0 as we did not prealocate any funds to this account.
Next, we set the miner address as the payout address for the miner.
And then we start the miner.
Generate Ethereum Private Key
After generating the DAG, the miner should start pushing blocks.
Generate Ethereum Private Key Javascript Free
And the initial peer should start importing.
Once we stop the miner and check the balance again, we see that after 20 blocks mined the account has 60 Ether.
Having gotten this far, you should now have a basic understanding of how to set up you private Ethereum blockchain.
As mentioned in the introduction, you're currently reading the first article in a series so if you want to build your blockchain further, make sure you check the next one (by following Around25 on Twitter, LinkedIn, or Facebook). There, we’ll dig in a different implementation of the Ethereum protocol by parity.
Oh, and one more thing: want to challenge the ideas above, ask any questions or just learn more about how we do blockchain? Check this page or request our expertise here.