Guide for signing transactions offline using MyCrypto instead of MEW:
https://support.mycrypto.com/offline/making-offline-transaction-on-mycrypto.html
Topic: DELETE (Read 926 times)
Air gaped MEW allows to sign transactions not only for ETH but also for ERC20 tokens. If your token is not in MEW list you can add it by following these steps:
P.S. To send signed transaction via online computer you must add you token to online MEW by using standard way to add custom token.
- 1st step: Open js folder (located inside MEW folder on you offline PC).
- 2nd step: Find etherwallet-master.js file and open it with notepad++ editor.
- 3rd step: Into module.exports section* of above file add the following string :
{"address":"address of your token","symbol":"symbol of your token","decimal":number of decimals of your token,"type":"default"}
Just as an example: for HAV I have added
{"address":" 0xf244176246168f24e3187f7288edbca29267739b","symbol":"HAV","decimal":18,"type":"default"}
You string can be added between any {.........} available but it's better to place it in the alphabetical order.
* For v. 3.21.13 of MEW this section is started at 20951 line if you open etherwallet-master.js file with notepad++ editor. - 4th step: Choose added token to send and follow the same procedure to sign ERC20 transaction as it was described in OP.
P.S. To send signed transaction via online computer you must add you token to online MEW by using standard way to add custom token.
Thank you very much for your contribution - totally forgot about it.
Just buy the ledger or the ledger trozer. These two hardware wallets also keep the private key secure, much safer than the web.
Well, a hardware-wallet (as written in the guide) would be the safest way of storing your assets.
However for smaller amounts signing your transactions offline and keeping your private-key isolated from the internet would be a very good alternative to buying a hardware-wallet.
Thanks for guide. This is the first time I heard about Offline feature of MyEtherWallet.
Last time I use Ethereum Wallet (download from ethereum.org) but the problem is that it does not support ERC-20 tokens.
Last time I use Ethereum Wallet (download from ethereum.org) but the problem is that it does not support ERC-20 tokens.
Thank you very much for your feedback!
Hi,
Thank you very much for your feedback!
Well, I could be wrong but as far as I know you can't do offline-transactions using MyCrypto.
I also prefer MyCrypto but I'm using it in combination with my Ledger Nano S hardwarewallet.
If you haven't got a hardware-wallet I'd suggest using an interface that allows signing your transactions offline to keep your private-key isolated from the internet - otherwise it doesn't matter which interface you're using but at least don't store your unencrypted private-key/recovery-phrase on your PC and only use your keystore-file.
But I'd recommend signing your transactions offline and checking your balance using a blockchainexplorer or just buying a hardware-wallet.
If you're doing a complete factory reset you could even buy a Ledger Nano S second hand - just make sure to do a reset (or even two; just to be sure)
Best regards,
Nestade
Thanks this is really a good post, really helps a lot.
In fact, this is a very useful guide, because recently I often meet messages that wallets have been hacked. An offline wallet is the best way to control your money.
Thank you very much for your feedback!
Actually, I've left MEW and have moved to another service, Mycrypto.
But this is a very good tutorial, maybe later I will try it. Thank you for sharing this tutorial.
But this is a very good tutorial, maybe later I will try it. Thank you for sharing this tutorial.
Well, I could be wrong but as far as I know you can't do offline-transactions using MyCrypto.
I also prefer MyCrypto but I'm using it in combination with my Ledger Nano S hardwarewallet.
If you haven't got a hardware-wallet I'd suggest using an interface that allows signing your transactions offline to keep your private-key isolated from the internet - otherwise it doesn't matter which interface you're using but at least don't store your unencrypted private-key/recovery-phrase on your PC and only use your keystore-file.
But I'd recommend signing your transactions offline and checking your balance using a blockchainexplorer or just buying a hardware-wallet.
If you're doing a complete factory reset you could even buy a Ledger Nano S second hand - just make sure to do a reset (or even two; just to be sure)
Best regards,
Nestade
Great guide for everyone, who want to secure assets. I used to send offline transactions before I bought Ledger Nano S. And there weren't any problems!
Hi,
Thank you very much for your feedback
Yes, I guess it's just more effort in comparison of using a hardware-wallet - but most people won't do transactions every day anyway.
Signing your transactions offline is definitely better than just using MetaMask/Keystore-File or even your unencrypted private key on an online machine.
There's always a risk of getting infected by malware and using a hardware-wallet or doing offline transactions should prevent it from getting access to your wallet.
Very useful information! Thank you.
I find phishing sites MyEtherWallet using the Metatask plugin. But this does not always help.
Your solution is more universal
I find phishing sites MyEtherWallet using the Metatask plugin. But this does not always help.
Your solution is more universal
Hi,
Completely isolating your private-key from the internet by signing the transactions offline should protect you from almost any kind of malware and phishing.
It's just more work than using a hardware-wallet.
Best regards,
Nestade
We all have Personal files and we’ll want to keep hidden from the people but, Just locking your PC with a password isn’t sufficient, as people can still find methods to bypass the lock screen and see your personal files. So to be safe from this some people are locking their drives with the password, but not everyone Knows How To Lock Drive in Windows 10.
Just Go To This Website https://www.trickyworlds.com/how-to-lock-drive-in-windows-10/ And Solve Your Problem
Just Go To This Website https://www.trickyworlds.com/how-to-lock-drive-in-windows-10/ And Solve Your Problem
Nice and concrete overview, will bookmark it. As for me, i'm too lazy and sending my tokens via MyEtherWallet online...)
It is a very good guide, that cannot save people time, but can save people money, which is more important in this case
There was also a message that MetaMask was updated, and that users have to sign in, without seed phrase, was that also of a phishing nature?
There was also a message that MetaMask was updated, and that users have to sign in, without seed phrase, was that also of a phishing nature?
A good way for transactions ! Thank you for the post, it is very productive and contains information that allows you to protect your wallet from scams.
Made a translation of your topic for Russian-speaking users. Very useful information! My one merit for you
https://bitcointalksearch.org/topic/m.46499807
https://bitcointalksearch.org/topic/m.46499807
Just buy the ledger or the ledger trozer. These two hardware wallets also keep the private key secure, much safer than the web.
Thanks for guide. This is the first time I heard about Offline feature of MyEtherWallet.
Last time I use Ethereum Wallet (download from ethereum.org) but the problem is that it does not support ERC-20 tokens.
Last time I use Ethereum Wallet (download from ethereum.org) but the problem is that it does not support ERC-20 tokens.
Actually, I've left MEW and have moved to another service, Mycrypto.
But this is a very good tutorial, maybe later I will try it. Thank you for sharing this tutorial.
But this is a very good tutorial, maybe later I will try it. Thank you for sharing this tutorial.
In fact, this is a very useful guide, because recently I often meet messages that wallets have been hacked. An offline wallet is the best way to control your money.
Thanks this is really a good post, really helps a lot.
Great guide for everyone, who want to secure assets. I used to send offline transactions before I bought Ledger Nano S. And there weren't any problems!
Very useful information! Thank you.
I find phishing sites MyEtherWallet using the Metatask plugin. But this does not always help.
Your solution is more universal
I find phishing sites MyEtherWallet using the Metatask plugin. But this does not always help.
Your solution is more universal
All your guides are really helpful to the community but it gets wasted since it is being posted in a Mega Spam Board. Could you please move all your guides to the Beginners and Help Section so that it could be really helpful to the newbies who are coming here to seek knowledge?
P.S I have been meriting you constantly due to the immense work you put in your each guide! But Guides like these should never get buried in these Spams. :/
P.S I have been meriting you constantly due to the immense work you put in your each guide! But Guides like these should never get buried in these Spams. :/
Some tokens are not listed already when trying to choose that asset to send, can I add new token info when using it offline? I could not do it before.
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
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
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
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
This is gonna be good but it's too complicated to update our wallet.
I'm okay with using MEW via google chrome MEW extension, it's very good and easy to use.
Every time you want to login, you just have to enter the password and you can view or send ETH from there.
If you'd like to use TrueCrypt just make sure to use version 7.1a as 7.2 got no encryption-functionality anymore. And I agree, I'm sure they just received a NSL and had to stop their service or insert a backdoor for NSA and they chose the first option.
if you have large sums-you can do so. the only difficulty with ethereum wallet-you never know what to choose the Commission to make the transaction take place. thanks for the instruction
Well, I'm not sure but it may be possible creating a second partition but it has to be isolated from the online-partition (Encryption?).
A USB will solve the problem at hand. Just make sure that the USB where the local copy of Myetherwallet will be stored would not be used and plugged into another computer unless one is certain that it is malware free. You can also follow this guide to create a second partition out of the current local disk that you have(if it is malware/virus free, it will do) and follow this tutorial if you want to encrypt the second partition that you will create. 
This involves a little technicality, I have not really tried this out, but am willing to give it a shot, thanks for the piss
awesome guide, thank you for that great piece of work. maybe i should consider getting an offline PC at home now 
This is really a very good description and guide. Your contribution is worth saving it into my bookmark. Keep it up and you will certainly collect a lot of merit. I would like to give you more, but I'm now broke. 
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
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
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
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
And another high-quality post from your side - thanks again!
Will merit you soon... keep up the good work!
DELETE
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