It would be only of limited use. Bitcoin Wallet updates the blockchain in the background, while the app is not "running". It would need to ask for a passphrase just for that.

Jouke, can you report bugs in the issue tracker?

Otherwise, chances are that they get lost in the noise.

Did you also look for the messages in the log? If it is not even querying bitseed.xf2.org, how can it choke on an ipv6 answer (no request => no response)?

Perhaps it would be best to open a ticket on the bitcoinj bugtracker:
http://code.google.com/p/bitcoinj/issues/list

At some time I will (although I've got no idea if they accept payment apps into their store).

But before that happens, a testing process for not yet released versions needs to be established. So I wonder if someone was able to install the .bar I put up on the downloads page, and how he did it. Unlike Android, I've only very little knowledge about BlackberryOS.

For several months I have sitting on a private branch a modification that persists node addresses across restarts. However, I never switched it live because the current bitcoinj API restricts too much how the querying works.

Bitcoin Wallet uses bitcoinj 0.6 which includes bitseed.xf2.org in the list of hosts to query. Is your issue reproducable? Can you look up in the log for "DNS lookup for xxx failed." messages?

Just today I uploaded a Blackberry test version:

http://code.google.com/p/bitcoin-wallet/downloads/list

Let me know if its installable on a Playbook and how it performs.

If your wallet file is really named like you said, the wallet was not created by Bitcoin Wallet but by a different app (Bitcoin Android). It's not being maintained any more and uses a very old version of bitcoinj.

You can try this guide to extract your private key(s):

http://gary-rowe.com/agilestack/2011/12/28/how-to-recover-lost-bitcoins-from-an-android-wallet/

This is a planned feature. However for this to be secure, I need to integrate the QR code scanner into the app rather than relying on an external app plus the Android Intent system to securely transmit data. I'm working on it.

Also, can you give me examples of existing Bitcoin apps/web pages that export private keys via QR? Which format(s) do they use?

The timestamps are the date of the private key created, or the first appearance of the corresponding address in the block chain.

They are optional and are meant only for the importer to be able to catch-up the blockchain faster. If you leave it out, the whole blockchain needs to be scanned for the imported key(s).

Very nice project!

If this hardware would be designed as an ADK (Android Accessory Development Kit) device, it could be connected to virtually every phone with at least Android 2.3.3 installed and be used with Bitcoin Wallet.

I think ADK support is optional, so the same device could be connected to a PC as originally intended.

I'd be happy to implement the necessary software support on the Android side!

I just released 2.31 final to market. So key import/export is now available to everyone. Well mostly everyone. I had to raise the minimum requirement to Froyo (Android 2.2) and above.

There is OpenSSL for Windows. However, I can't help you with that since I use Windows only for gaming.

You can try importing the file into Multibit, it's also available for Windows.


Your device only assigns very little memory (32 MB) to each app. Thus, you are experiencing lots of out of memory errors. Try uninstalling all apps you don't really need.


The plan is that memory requirement will be lowered considerably by receiving only transactions that are relevant to your wallet. However, this is still some time in the future (needs enhancements of protocol and upgrades of Satoshi clients), so your best bet is upgrading to a decent phone like the Galaxy Nexus.

I added a little bit of info to the README (see FILES section).

The main use case is backups, which should not need much explanation. On devices with SD card, export to your SD card directly or if external storage is in fact internal, pull your backup via USB cable. Importing is the other way round (-:

For many people, the usecase will be a wallet shared between two devices. However, I advise against such a setup (due to the risk of creating invalid transactions). For this reason, I have not documented it.

Yes, I don't have these numbers and no reason to collect them.

@gizmo Instawallet is added twice to the poll.

Thanks for your numbers. Here are Bitcoin Wallet numbers:

• Total installs to date: 18016 (plus several hundreds from the downloads page)
• Active device installs: 5513
• Cannot say about installs with actual BTC in them, as I would feel myself bad eavesdropping on peoples "bank accounts".

code.l.google.com 173.194.69.113

Are you able to clone other repos? And other repos from different services (e.g. github)?

Bitcoin Wallet 2.23 fixes bugs and is based on bitcoinj 0.6.

The main user-facing feature is pictured in the image. You can watch pending transactions propagate through the network. As peers report the transaction, a grey circle grows. Finally, it is replaced by the well-known green block chain confirmation indication.

For the sender, this helps determining if a transaction was actually sent.

For the receiver, confidence in the validity of the transaction builds, as each peer should validate each transaction. However, this is just an indication. Nothing beats the validation power of the block chain.

Install/Upgrade Bitcoin Wallet from Google Play: https://play.google.com/store/apps/details?id=de.schildbach.wallet

Works at my place. Just try again?