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Author Topic: Offline paper wallet for android - now with spending possible!  (Read 7555 times)
Valle
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May 19, 2013, 06:36:00 PM
Last edit: February 07, 2014, 07:11:46 PM by Valle
 #1

Hi! I've just updated my android offline "paper bitcoin client" - https://play.google.com/store/apps/details?id=ru.valle.btc

Now it can not only to generate key-address pair, but also it can create and sign transactions using your private key, so now you can quite easily spend money from your paper wallet. Mini, brain wallet, WIF, WIF-compressed, BIP 38(both ec modes) private key formats are supported. Enjoy!

sources: https://github.com/ValleZ/Paper-Wallet

NEW in version 2.2.0 - wallets printing, view QR codes and changing password for encrypted keys

ps Check out the app's permissions ;-)


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austins
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June 26, 2013, 12:21:17 PM
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What are the list of spending fees?

apetersson
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June 26, 2013, 03:31:26 PM
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how exactly are you able to spend money sent to this address?
Valle
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July 06, 2013, 11:41:37 PM
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What are the list of spending fees?

Now it is hardcoded to 0.0005 btc, next version will allow to set this fee.
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July 06, 2013, 11:46:03 PM
Last edit: July 07, 2013, 03:55:28 AM by Valle
 #5

how exactly are you able to spend money sent to this address?
Any address with positive balance have unspent outputs (transactions). You have to obtain these transactions in raw form from bitcoin qt and paste it to the app. Then it would generate spending transaction (and verify it by itself) and after that you have to copy it and push it to bitcoin network by yourself using bitcoin qt or any other bitcoin service which allow to do that. It's quite easy. Most complicated thing is to obtain that unspent raw transaction.
Valle
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July 18, 2013, 05:20:25 PM
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Sources published: https://github.com/ValleZ/Paper-Wallet
apetersson
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August 12, 2013, 06:46:34 PM
 #7

key generated by the paper wallet are insecure due to the android bug. http://bitcoin.org/en/alert/2013-08-11-android
see https://github.com/ValleZ/Paper-Wallet/blob/master/src/ru/valle/btc/BTCUtils.java#L53

please notify all users of the software that keys generated by this need to be switched.
Valle
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August 14, 2013, 03:25:23 AM
 #8

Fix is already available, warning posted. Thanks for the reminder!
Valle
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November 30, 2013, 08:09:14 PM
 #9

I've added some new great stuff like BIP 38 encoding/decoding, qr code scanner, retrieving unspent transactions from blockchain.info (by copypasting from browser) and more!
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December 02, 2013, 08:18:11 AM
 #10

Good!

Can you also add brainwallet functionality? (ex: com.CIMS.BitcoinAddress isn't updated anymore)

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Valle
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December 03, 2013, 02:07:11 AM
 #11

Yes, it was implemented too :-) Try to type anything in private key field
CharlesSafety
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December 18, 2013, 12:13:34 AM
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This is a pretty nifty app, good work.
Valle
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December 23, 2013, 07:04:25 AM
 #13

This is a pretty nifty app, good work.

Thanks!
Valle
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February 07, 2014, 07:10:58 PM
 #14

New version available with lots of new features like printing, qr codes, sharing, simplified UI, and more
joethejudge77
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February 26, 2014, 08:16:56 AM
 #15

New version available with lots of new features like printing, qr codes, sharing, simplified UI, and more

When you will release new version? As I do like this one but looking forward to try new one

Don't let me be misunderstood.
Valle
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March 09, 2014, 06:46:56 PM
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I don't know, maybe in ~2 weeks. I'm slowly updating tx generation part.
btcjedi
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March 21, 2014, 08:57:53 AM
 #17

What is offline paper wallet? How it works?
softron
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March 22, 2014, 07:25:43 AM
 #18

Nice app will test this

Valle
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March 22, 2014, 06:12:01 PM
 #19

What is offline paper wallet? How it works?

It's just a bitcoin wallet without permission to use internet. It also doesn't store any information what you don't see on screen, so you have to keep your "wallet" (private keys) somewhere else, for example - in a written form on a paper.


joethejudge77:

Sorry, I'm working on automatic fee calculation and it have more obstacles than I thought. I need to design new UI elements for entering confirmations count and test it very carefully, so release will be a bit later.
Valle
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March 30, 2014, 02:19:06 AM
 #20

Version 2.30 is out. There are automatic fee calculation and better UX.
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