Archive for the ‘Crypto Coins’ Category

etherwaller-paper-wallet

This is an interesting and quite useful tool for people willing to generate an Ethereum wallet without having to install an Ethereum client on their computer for the moment. Ether Wallet is a web-based service that is in the form of a client-side tool (no data is being sent to a server) for generating Ethereum wallets, Ethereum paper wallets and even to send transactions over the network. EtherWallet is an open source and written in JavaScript client-side tool, you can download the source code here and run it directly from your own computer if you have some privacy worries about the wallets generated on the website.

You can of course import your Ethereum wallet generated with Ether Wallet, even if you printed a paper wallet, into geth for example with your unencrypted private key that you need to save into a file. All you have to do is to run the geth client with the following command line where instead of keyfile you need to type the file name of the file you have saved your unencrypted private key in:

geth account import keyfile

You will be asked to enter a password in order to encrypt the key when your account is being imported in geth and the password you enter will be needed in order for you to unlock your account for executing transactions in the future. So make sure you remember your password and then do a backup of your Ethereum wallet in geth.

To try out the EtherWallet service and generate an Ethereum wallet including a paper one…

ethereum-datadir-check-for-backup

Just like with Bitcoin’s wallet.dat file that contains your wallet address and keys and that you need to backup for safety reasons, Ethereum also has a similar wallet file that you should have a spare copy of. With Ethereum the wallet file has a bit weird name and is not just called wallet.dat, but it has essentially the same purpose and the file works essentially the same way as the wallet.dat with Bitcoin and many other alternative crypto coins. Ethereum’s wallet file is stored in the data directory used by the client to store the blockchain and other files, the default locations for the datadir on different operating systems are listed below.

Default datadir locations:
– Mac: ~/Library/Ethereum
– Linux: ~/.ethereum
– Windows: %USERPROFILE%\AppData\Roaming\Ethereum

To get the full path of the data directory on your specific system you can run the geth console and type admin.datadir and you will see a result like on the screenshot above with the full path. Note that the wallet file is not stored in the main datadir folder, but is instead placed in a separate folder under it called keystore. Inside that folder you should see a file with a long name starting with UTC--2015..., this is the wallet file you need to backup. Do note that aside from the wallet file itself you will also need to remember the password (or also back it up along the wallet) that you set when creating your account, without the password needed to unlock it the wallet file won’t be of much use.

If you are moving your Ethereum installation over to a different computer or want to have a copy on another system for solo mining for example, aside from a copy of the wallet file you may also want to make a copy of the blockchain, so that the geth client will not need to download the whole thing again from the network. For the moment the Ethereum blockchain is not that big, but as it continues to grow it can become a very time consuming task to wait for the blockchain to download over the network like it already is with bitcoin for example. So here is how you can also export and then import the Ethereum blockchain should you need to do so.

Export and Import the Ethereum Blockchain:
– Run: geth export blockchain_backup
– Copy the blockchain_backup file to the new system (a bit over 60 MB for the moment)
– On the new system run: geth import blockchain_backup

You can also export and import the blockchain data from a geth console mode, however it seems that when ran inside the console it is doing it much slower than the above method. The commands for the Javascript console are admin.exportChain('blockchain_backup') and admin.importChain('blockchain_backup'), so you can try with them as well, but the first example should be faster.

Download geth and ethminer compiled for Windows and ready to be used…

ethereum-wisdom

We are sure that most of you are using BitcoinWisdom as a great service to track the price movement of Bitcoin, Litecoin and maybe even some other altcoins as well as their other services such as difficulty charts or mining calculators. Well now it seems that there is a new service trying to do something similar but for Ethereum, the service is called Ethereum Wisdom and it shows real-time Ethereum (ETH) price for various markets (Kraken, Poloniex, Cryptsy, Bittrex and more) and various currencies (BTC, LTC, USD, EUR). It is not as advanced as Bitcoin Wisdom, but can provide you with a quick overview on what is currently happening with the price of Ethereum’s Ether (ETH) coins across the exchanges in a single window without having to check them individually. So we recommend that you give the service a try if you are mining or trading Ethereum coins.

To check out the service tracking Ethereum (ETH) prices across the exchanges…


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