<p>electrum android app can do this! check it out, it's perfect!
also seems like a nice wallet with a lot of features.</p>

<p>your watch-only online electrum can create an unsigned transaction with QR code.
your offline electron can scan then sign it &amp; generate a QR code for you to broadcast with online electrum!</p>

CC BY-SA 4.0
2019-01-25T07:25:48.170Z
i recommend using multisig instead. same idea, just an extra level of security by also requiring the key from your online phone
Farzher
CC BY-SA 4.0
2018-07-04T05:25:40.237Z
2018-07-11T01:23:15.660Z
2018-07-11T01:23:15.660Z
Farzher
<p>here's what i want to do:</p>

<p>store my private key on an offline phone.
use that offline phone to generate a signed transaction and generate a QR code for me to scan/broadcast with my online phone.</p>

<p>does this exist?!? i cannot find an app to do it</p>

<p>seems like the most secure/convenient way to use bitcoins.</p>

CC BY-SA 4.0
2018-07-03T19:15:22.447Z
Beware: phones are built for connectivity. To make a truly offline device you'll want to take extra steps to ensure you remove **all** connective functions (wifi, bluetooth, etc) from the device. Otherwise this is a reasonable idea, though I'm not sure what software is mobile-ready to display signed transactions in the way you need.
chytrik
CC BY-SA 4.0
2018-07-04T03:14:15.690Z
that's a good tip. i thought even if i have 100 virus on my phone it won't matter because it'll never go online. but what if the virus re-enables online o.o

also i need to make sure to encrypt phone's data, just in case it's stolen there's no keys on the drive
Farzher
<transactions><wallet><offline-transactions>
use old offline phone as a hardware wallet?
Farzher
# use old offline phone as a hardware wallet?

(Asked by: username_0 on 2018-07-03)

here's what i want to do:

store my private key on an offline phone.
use that offline phone to generate a signed transaction and generate a QR code for me to scan/broadcast with my online phone.

does this exist?!? i cannot find an app to do it

seems like the most secure/convenient way to use bitcoins.

**Tags:** transactions, wallet, offline-transactions

> **Comments:**
> **username_1**: Beware: phones are built for connectivity. To make a truly offline device you'll want to take extra steps to ensure you remove **all** connective functions (wifi, bluetooth, etc) from the device. Otherwise this is a reasonable idea, though I'm not sure what software is mobile-ready to display signed transactions in the way you need.  
> **username_0**: that's a good tip. i thought even if i have 100 virus on my phone it won't matter because it'll never go online. but what if the virus re-enables online o.o  also i need to make sure to encrypt phone's data, just in case it's stolen there's no keys on the drive  

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## 1 answers

### Answer by username_0 on 2018-07-04. Score: 3 | Accepted answer

electrum android app can do this! check it out, it's perfect!
also seems like a nice wallet with a lot of features.

your watch-only online electrum can create an unsigned transaction with QR code.
your offline electron can scan then sign it & generate a QR code for you to broadcast with online electrum!

> **Comments:**
> **username_0**: i recommend using multisig instead. same idea, just an extra level of security by also requiring the key from your online phone  

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