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Author Topic: Bitcoin Wallet for Android  (Read 120343 times)
Mike Hearn
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April 08, 2013, 08:30:27 PM
 #281

The current fee should always be high enough, I think.

I think $ communicates the idea of "other currency" pretty well, even if it's not technically accurate for the currency you selected. BTW, it's also still not really obvious how to change that currency, imo. There's no visible indication you can tap the balance.
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April 18, 2013, 01:39:06 PM
 #282

Is there a way to export the private key unencrypted? I need to see it, so I can import it in another client, like the desktop clients. Also, is there a way to import your own private key?

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April 18, 2013, 03:33:44 PM
 #283

Is there a way to export the private key unencrypted? I need to see it, so I can import it in another client, like the desktop clients. Also, is there a way to import your own private key?

I used Titanium Backup to import keys in MultiBit, but you need to be root.
Make a backup of Bitcoin Wallet, look for the archive
de.schildbach.wallet-SOME_DATE_HERE.tgz
open it, look for data/data/de.schildbach.wallet/./files/key-backup-base58

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Andreas Schildbach
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April 18, 2013, 03:36:37 PM
 #284

Is there a way to export the private key unencrypted? I need to see it, so I can import it in another client, like the desktop clients. Also, is there a way to import your own private key?

Moving private keys around is a discouraged use-case. There is a lot of thing that can go terribly wrong.

That said, you cannot export unencrypted because on Android there is no shared storage you can trust. But you can export encrypted and decrypt using openssl, see this readme:

http://bitcoin-wallet.googlecode.com/git/wallet/README

Importing keys is also possible.
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April 18, 2013, 03:38:46 PM
 #285

I used Titanium Backup to import keys in MultiBit, but you need to be root.
Make a backup of Bitcoin Wallet, look for the archive
de.schildbach.wallet-SOME_DATE_HERE.tgz
open it, look for data/data/de.schildbach.wallet/./files/key-backup-base58

If you're root, you can just as well pull this file from the device directly, without taking the Titanium detour.
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April 18, 2013, 03:43:01 PM
 #286

Is there a way to export the private key unencrypted? I need to see it, so I can import it in another client, like the desktop clients. Also, is there a way to import your own private key?

You can decrypt it yourself... either by downloading an AES ( 256 bit ) decrypter or using one of the online ones. 

I did that to import some keys into blockchain.info/wallet that I exported from this android wallet. 
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April 18, 2013, 03:51:03 PM
 #287

I used Titanium Backup to import keys in MultiBit, but you need to be root.
Make a backup of Bitcoin Wallet, look for the archive
de.schildbach.wallet-SOME_DATE_HERE.tgz
open it, look for data/data/de.schildbach.wallet/./files/key-backup-base58

If you're root, you can just as well pull this file from the device directly, without taking the Titanium detour.

I had a mess on my phone at that time (SGS and Android 2.1... bleah), it wasn't working well anymore and I needed to uninstall most of the apps to have an usable phone, fortunately I had those backups on my sd card. Smiley

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Andreas Schildbach
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April 18, 2013, 04:07:37 PM
 #288

I had a mess on my phone at that time (SGS and Android 2.1... bleah), it wasn't working well anymore and I needed to uninstall most of the apps to have an usable phone, fortunately I had those backups on my sd card. Smiley

Is that backup file encrypted?

It's probably not yet relevant, but I fully expect it will be in future: Any app can read from external storage (SD card). As soon as unencrypted private keys on unprotected storage become common enough, malicious apps will read and leak them.
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April 18, 2013, 04:32:26 PM
 #289

Is that backup file encrypted?

It's probably not yet relevant, but I fully expect it will be in future: Any app can read from external storage (SD card). As soon as unencrypted private keys on unprotected storage become common enough, malicious apps will read and leak them.

It wasn't encrypted.
I'm talking about the last version of Android Wallet that still "worked" under Android 2.1, it was months ago. I didn't install almost anything anymore on that phone, and I'm not using any wallet app too. I tried to install Electrum (i liked the idea of a phone/PC synced wallet) on a new Android phone, not rooted, but without luck.

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April 19, 2013, 02:49:47 AM
 #290

Okay, I am root, and found it in /data/data/de.schildbach.wallet/files

There is a key-backup-base58 and several versions of that same file, and a wallet-protobuf.

I've also found how to import public keys (bitcoin addresses) via QR code, but there isn't a way to import private key QR codes, or private keys in WIF.

Anyway, I will probably just use one key for mobile phone use.

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BurtW
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May 01, 2013, 03:29:56 PM
 #291

One of my transactions is listed as "dead" in the wallet and shows a "!" instead of the normal green circle.  The transaction shows as valid in the block chain.  What is going on?  Do I need to reset/reload the block chain in order to fix this?

My wallet balance is correct.
The person I sent the coins to got the coins.

So it is just anoying to look at in the GUI on my phone, does not appear to have affected anything.

Transaction in question is:

https://blockchain.info/tx/9b0ee3b78b18950b491b6e86d763bd3ae418ec0f7785d322f2615e544d998ebe

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Mike Hearn
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May 01, 2013, 09:06:37 PM
 #292

That is a bug. If you reset your chain and let it sync that should fix it.
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May 01, 2013, 09:09:59 PM
 #293

That is a bug. If you reset your chain and let it sync that should fix it.
Yes, it did fix it. Looks great now.  Thanks!

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May 06, 2013, 04:30:41 PM
 #294

Hi,
great app but is there a way to encrypt the wallet ?

Is it not a problem if the wallet in the android application is not encrypted ?

Thank you Smiley
Andreas Schildbach
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May 06, 2013, 05:04:43 PM
 #295

great app but is there a way to encrypt the wallet ?
Is it not a problem if the wallet in the android application is not encrypted ?

Currently you can't. It should not be a problem because Android already isolates your app private files against all other non-root apps. So as long as you're not running anything as root you should be safe.
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May 06, 2013, 05:46:45 PM
 #296

great app but is there a way to encrypt the wallet ?
Is it not a problem if the wallet in the android application is not encrypted ?

Currently you can't. It should not be a problem because Android already isolates your app private files against all other non-root apps. So as long as you're not running anything as root you should be safe.

Alright thank you Smiley But I use root apps (ES Explorer for example).
Are there plans to implement this feature ?

Thank you Smiley
Andreas Schildbach
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May 06, 2013, 06:02:34 PM
 #297

great app but is there a way to encrypt the wallet ?
Is it not a problem if the wallet in the android application is not encrypted ?

Currently you can't. It should not be a problem because Android already isolates your app private files against all other non-root apps. So as long as you're not running anything as root you should be safe.

Alright thank you Smiley But I use root apps (ES Explorer for example).

So you better have reasons to trust these apps very well.

Quote
Are there plans to implement this feature ?

It's planned, but there is still some work to do, and its not my top priority. One reason is it won't help in cases like yours: If an app has got root, it can probably just capture keypresses or trick you into signing their transaction. Encryption just puts the bar a little bit higher for a successful attack, but its far from a silver bullet.
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May 06, 2013, 06:09:22 PM
 #298

It's planned, but there is still some work to do, and its not my top priority. One reason is it won't help in cases like yours: If an app has got root, it can probably just capture keypresses or trick you into signing their transaction. Encryption just puts the bar a little bit higher for a successful attack, but its far from a silver bullet.

Yep, I understood it Smiley
Thank you for your answer and the application (amazing app).

Just one more thing, the transaction on the "home" show something like :
1 BTC from ADDRESS

Would be great if ADDRESS was replaced by the label of our address.
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May 08, 2013, 07:52:07 PM
 #299

As far as I understand it is pretty easy to take the coins from a stolen smartphone?

Is it possible to add a watch only wallet? This would be to receive coins at a store/restaurant/bar for example.

(German thread: https://bitcointalk.org/index.php?topic=197959.0)

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May 11, 2013, 01:23:05 PM
 #300

Hi, loving the client.


Question: I have a client with exactly one private key.
I'd like to export this encrypted key (done) and would like to print the private key to put it in my safe.
How would I best go about this?
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