Bitcoin Wallet for Android

[Rassah]

Just had a weird thought:

Since this wallet can sign and transmit transactions over Bluetooth, doesn't this mean that you can essentially use it as a very secure cold-storage wallet, by disabling all data and internet connection on a separate phone running it, and leaving only Bluetooth powered up?

[hgmichna]

Just had a weird thought:

Since this wallet can sign and transmit transactions over Bluetooth, doesn't this mean that you can essentially use it as a very secure cold-storage wallet, by disabling all data and internet connection on a separate phone running it, and leaving only Bluetooth powered up?

Not so weird, actually a good idea.

I personally would prefer a data connection that is thinner than Bluetooth and one which the user can check. One possibility would be QR codes.

But perhaps Bluetooth is secure enough. I cannot tell.

[Rassah]

Just had a weird thought:

Since this wallet can sign and transmit transactions over Bluetooth, doesn't this mean that you can essentially use it as a very secure cold-storage wallet, by disabling all data and internet connection on a separate phone running it, and leaving only Bluetooth powered up?

Not so weird, actually a good idea.

I personally would prefer a data connection that is thinner than Bluetooth and one which the user can check. One possibility would be QR codes.

But perhaps Bluetooth is secure enough. I cannot tell.

Hey, that would be neat, add the option to display the signed transaction as one, or a series, of QR codes, in case Bluetooth isn't an option. With used phones becoming so cheap, this might even give Armory and Trezzor some competition.

[Andreas Schildbach]

I personally would prefer a data connection that is thinner than Bluetooth and one which the user can check. One possibility would be QR codes.

Hey, that would be neat, add the option to display the signed transaction as one, or a series, of QR codes, in case Bluetooth isn't an option. With used phones becoming so cheap, this might even give Armory and Trezzor some competition.

Sending payments via QR code was implemented a few years ago. Tap a transaction and then the QR button.

[Rassah]

I personally would prefer a data connection that is thinner than Bluetooth and one which the user can check. One possibility would be QR codes.

Hey, that would be neat, add the option to display the signed transaction as one, or a series, of QR codes, in case Bluetooth isn't an option. With used phones becoming so cheap, this might even give Armory and Trezzor some competition.

Sending payments via QR code was implemented a few years ago. Tap a transaction and then the QR button.

Wait, that's what the little QR thing up there is? HOLY CRAP!!! 
Question, can you create a transaction, or a series of transactions, without the prior transactions being confirmed yet? Just wondering about using a phone as cold storage options.

[Andreas Schildbach]

Question, can you create a transaction, or a series of transactions, without the prior transactions being confirmed yet? Just wondering about using a phone as cold storage options.

No, not with the current app.

[RoooooR]

This app is great.. An engineering wonder. Thank you Mr.Schildbach !

Anyway I forgot 2 btc in there and delete the app.. I think the application should backup in background for forgetful like me.

[2weiX]

This app is great.. An engineering wonder. Thank you Mr.Schildbach !

Anyway I forgot 2 btc in there and delete the app.. I think the application should backup in background for forgetful like me.

yeah, I second that. at least add another backup target (dropbox, MEGA, put.io, what have you)...

[dillpicklechips]

I don't think this was answered above exactly but are there plans to allow turning an old phone into a cheap hardware wallet? Have some private keys exist on a phone (with some type of phrase to restore them in case the phone dies) that is disconnected from everything permanently and it just signs transactions using qr codes?

[hgmichna]

This app is great.. An engineering wonder. Thank you Mr.Schildbach !

Anyway I forgot 2 btc in there and delete the app.. I think the application should backup in background for forgetful like me.

yeah, I second that. at least add another backup target (dropbox, MEGA, put.io, what have you)...

Trouble is that such a feature would create a gaping security hole.

The program could ask for a password, but then people would forget the password. It is difficult to protect people from their own mistakes.

[Rassah]

I don't think this was answered above exactly but are there plans to allow turning an old phone into a cheap hardware wallet? Have some private keys exist on a phone (with some type of phrase to restore them in case the phone dies) that is disconnected from everything permanently and it just signs transactions using qr codes?

It already shows signed transactions with a QR code. The only thing missing is it being able to update address balances from a QR code.

[CIYAM]

I gather that regarding using QR codes as comms for offline tx signing (which the CIYAM Safe does) the author is not keen to implement this due to the fact that if you're offline device has no block chain then it cannot know the amount of fee that is being paid (something that could perhaps be added to the script implementation down the track if there is enough demand).

Personally I don't see this attack as being really that much of a concern especially if you *know* how much you have in each of your UTXOs (but for the average joe this is perhaps too much to ask).

Anyway - if someone is interested in working on adding this feature then I'd be happy to set up a task on CIYAM Open and donate some BTC towards getting it done.

[dillpicklechips]

the author is not keen to implement this due to the fact that if you're offline device has no block chain then it cannot know the amount of fee that is being paid (something that could perhaps be added to the script implementation down the track if there is enough demand).

Couldn't the online device create the tx and it would know how to do the fees while all the offline device just does the final signing? The online device creates the tx. Offline device scans qr code to get tx details. Signs it and creates a qr code that the online device scans to get the completed tx.

[CIYAM]

Couldn't the online device create the tx and it would know how to do the fees while all the offline device just does the final signing? The online device creates the tx. Offline device scans qr code to get tx details. Signs it and creates a qr code that the online device scans to get the completed tx.

Absolutely - although the offline device cannot know the tx fee as it is not *in* the raw tx - the main problem is being sure that what you are signing is what you *think* that you are signing.

To most people who *do* raw tx's regularly (such as myself) this is not an issue (and I would love to be able to use an old mobile phone rather than something like a Trezor which *says you have bitcoins*) but I can understand that for most people this is perhaps a little too advanced.

As stated I would be willing to contribute BTC to get this developed - and I guess if others are also keen and we can come up with a reasonable amount for the task then perhaps someone might build it.

[hotwired007]

I'm having some issues with my wallet keep crashing - i am using a Samsung Galaxy Ace 2 - i regularly get this error message - The application Bitcoin (process de.schildbach.wallet) has stopped unexpectedly.

Do you have any recommendations on how to fix this? Its making the wallet pretty much unusable.

[Andreas Schildbach]

Can you send me a crash report? In the generated mail, please refer to this thread.

[hotwired007]

Can you send me a crash report? In the generated mail, please refer to this thread.

how? - Figured it out have sent it - fingers crossed there is some answers there.

[jack.wong@zetakey.com]

Saw your message on
[Bitcoin-development] Experiment with linking payment requests via href

We could work out the way to handle payment via href in our browser to Bitcoin Wallet.

https://play.google.com/store/apps/details?id=com.zetakey.browser

Any ideas?

[sturle]

I received some 1Sotchi spam to my android wallet, and after upgrade they were gone.  How will this spam be handled?  Is it completely removed from my wallet and will stay in the UTXO set forever?  Or just removed from my sight (thank you) and will be spent as an extra input to my next transactions, and just left as a fee?  A two input -> two output tx with a txfee of 0.00010001 will probably get confirmed just as fast as a one input -> two output tx with a standard txfee of 0.0001, but the first is IMHO better because it helps reduce the UTXO set.

[Populus]

Is this wallet still available? I can find Andreas Schildbach's apps on Google Play, all but the actual wallet.