Bitcoin Forum
November 12, 2018, 11:53:34 PM *
News: Latest Bitcoin Core release: 0.17.0 [Torrent].
 
   Home   Help Search Login Register More  
Pages: [1]
  Print  
Author Topic: [Guide] MyEtherWallet Offline Transactions [SECURITY]  (Read 32 times)
Nestade
Full Member
***
Offline Offline

Activity: 364
Merit: 124


alias xuNsh1ne


View Profile WWW
June 20, 2018, 12:53:30 PM
 #1

Hi,

In this guide I'd like to show you how to do offline-transactions using MyEtherWallet.
By using this method your private-key won't won't leave the offline machine so this is the safest way of sending transactions without a hardware-wallet.

First of all something about your private-key/keystore-file/recovery-seed: Do NOT store this files on your computer which is connected to the internet! If you're getting infected my malware you may lose all of your coins/tokens linked to this private-key. The safest way would be just using your keystore-file on your offline computer to sign transactions and storing your private-key/recovery seed safely on paper. Your private-key and recovery-seed are unencrypted provide instant access to your wallet while the keystore-file is encrypted and requires an additional password.

Requirements:
- a computer which is connected to the internet
- a computer which isn't connected to the internet
- Your ETH public-key
- Your ETH private-key (Keystorefile should be preferred)


Installing MyEtherWallet locally [Do this on the offline computer]

Download the local version of MyEtherWallet from the official MyEtherWallet Github (etherwallet-vX.X.X.X.zip):
https://github.com/kvhnuke/etherwallet/releases

Move "etherwallet-vX.X.X.X.zip" to your offline computer (USB Stick, Smartphone, ...) and extract the content from the ZIP.

Open MyEtherWallet by double clicking 'index.html' - you may have to right-click it, then go to 'Open with' and select a browser; I'd recommend using Google Chrome - you may want to download it on your online machine and transfer it to the offline machine.

Making an offline transaction

STEP 1: [ONLINE] Go to the MyEtherWallet-Website and select the 'Send Offline'-tab (https://www.myetherwallet.com/#offline-transaction). If needed adjust your GWEI according to https://ethgasstation.info/ by clicking on 'Gas Price: X GWEI' in the upper right corner and adjusting the slider to your needs. Then enter the public-address of the sender account into the 'From Address' textbox and click 'Generate'.
Write down the contents of 'Gas Price' and 'Nonce'.



STEP 2: [OFFLINE] Open your local copy of MyEtherWallet, select the 'Send Offline'-tab and scroll down to 'Step 2: Generate Transaction (Offline Computer)'.

Enter the following information:
- To Address: Receiver-address
- Value / Amount to Send: Amount you want to send (it's also possible to send Tokens by clicking on 'ETH' on the right side of the textbox and selecting the respective Token in the dropdown-menu)
- Gas Limit: https://kb.myetherwallet.com/gas/what-is-gas-ethereum.html
- Gas Price: Value from STEP 1
- Nonce: Value from STEP 1
- Data: optional - leave empty if not needed



Now scroll down until you see 'How would you like to access your wallet?' and log in using your preferred authentication-method (I'd recommend using your Keystore-File!) and click 'Unlock'.



Click 'Generate Transaction'

STEP 3: [OFFLINE] You'll now see two textboxes - 'Raw Transaction' and 'Signed Transaction'. Copy the content from 'Signed Transaction' and transfer it to your online computer.



STEP 4: [ONLINE] Go back to the MyEtherWallet-Website and select the 'Send Offline'-tab (https://www.myetherwallet.com/#offline-transaction). Scroll down to 'Step 3: Send / Publish Transaction (Online Computer)', enter your signed transaction, click 'Send Transaction' and confirm it.




Congratulations, you're done Smiley

Sidenote: To check your balance just use https://ethplorer.io/ or https://etherscan.io/ or log in to MyEtherWallet just using your public-key (View only of couse).

If you have any questions please feel free to ask anytime.

Best regards,
Nestade






Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1542066814
Hero Member
*
Offline Offline

Posts: 1542066814

View Profile Personal Message (Offline)

Ignore
1542066814
Reply with quote  #2

1542066814
Report to moderator
1542066814
Hero Member
*
Offline Offline

Posts: 1542066814

View Profile Personal Message (Offline)

Ignore
1542066814
Reply with quote  #2

1542066814
Report to moderator
Nestade
Full Member
***
Offline Offline

Activity: 364
Merit: 124


alias xuNsh1ne


View Profile WWW
June 20, 2018, 12:53:45 PM
 #2

More guides:

MyEtherWallet/Metamask
[GUIDE] Exporting your private-key from ImToken, Jaxx, Eidoo and Parity
[GUIDE] How to import your private-key from another wallet to MEW/MetaMask
[MyEtherWallet] Creating a (new) keystore-file using your private-key

SECURITY
[SECURITY] How to protect your wallets and private keys
[SECURITY] Generate your secure IOTA-Seed without using insecure online-generators

OTHER
Increase your internet-speed and your privacy by using Cloudflare's new DNS

Nestade
Full Member
***
Offline Offline

Activity: 364
Merit: 124


alias xuNsh1ne


View Profile WWW
June 21, 2018, 08:40:33 PM
 #3

Just as a small warning to MetaMask-Users:
https://medium.com/metamask/new-phishing-strategy-becoming-common-1b1123837168

Source: https://bitcointalk.org/index.php?topic=4507002.0      (German Subforum)

Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!