This. And, finding a solution that allows Bitcoin to scale to 1000s of transactions a minute. Once we have achieved this -> Finding a solution that allows Bitcoin to scale to 1000s of transactions a second.

I was there, and I don't want to rain on anyone's parade, but I believe it was another Erik who was mentioned in that context yesterday ;-)

That being said. Erik Voorhees, you are a true inspiration to many of us, and I am delighted to have you among us.

And the block chain grows at an accelerated pace...

Godt gået 
Nice to see good stuff happening in the Danish Bitcoin scene.

I am on the move, so short answer. When you uninstall/install you get a brand new wallet. More details here:
https://bitcointalk.org/index.php?topic=53353.msg1024102#msg1024102

As far as I remember you have to choose Sipa format when importing into blockchain.info.

Yes. It is the most secure web based wallet we have. Ben did a really good job.
There are two things that stick out:
1. The end user does not decide when to upgrade the javascript that handles private keys.
2. The server has all the encrypted private keys.
I don't see a good way around this without an external piece of software running on a user controlled device.

Joel, you are absolutely correct.
The hacks we have had over the last year make it vey plain that many Bitcoin users do not understand the security risks associated with trusting their funds with a third party.
I would like to see a list of Bitcoin services/software that meets some community defined minimum requirements. When someone asks "Is this service X safe to use?" the answer should be "If X is not on the list, then don't use it"

Services/software should be divided into categories such as exchanges/wallets/merchants etc, each with its own set of auditing rules.
Being a Bitcoin wallet developer myself I would be happy to have my code reviewed by a third party, and help set the minimum requirements for trusted Bitcoin wallets.

For Bitcoin wallets the list could look something like this:

• Code that manages private keys must be open source
• The source code must be peer reviewed by 2 developers from competing wallets
• Private keys must only be used by software running on hardware controlled by the user
• The user must be able to export private keys off a wallet at any time
• The wallet software must have a well defined release procedure
• The end user must be in control of when to upgrade
• The people behind the wallet should be publicly known persons, so you can go kick their ass
• ...

I know that this list will disqualify a bunch of eWallets (read wallets where you send your BTC to a private key that not controlled by you), but to be honest, I don't think that any Bitcoin company is mature enough to manage large amounts of other people's money.
(Jan tries to dodge the flames thrown by eWallet developers)

Same here, except I received it at my address in Denmark, and I am in California for another month 

I think you misunderstood the problem. BitcoinSpinner on the Kindle can create QR-codes alright. No need to create the QR codes in an alternate app. However, it cannot scan them as it has no camera. Since the only way you can restore a backup is by scanning a QR-code you cannot restore a backup to the Kindle. that is, until I add a feature that allows you to paste in a backup string. You can already copy a backup string to the clipboard.

Right. You are not the only one who has asked for the ability for doing a restore based on text input. Adding this to my list.

Oh, I didn't even know that you can run Android apps on the kindle.
I just uploaded the latest signed apk here: http://code.google.com/p/bitcoinspinner/downloads/list
Let me know whether it works.

Short answer:
The BCCAPI (which BitcoinSpinner is built on top of) allows you to create deterministic wallets using a strong seed. The stuff you backup/restore is the 256-bit seed that all keys are generated from. When you export a key you export an actual key generated from the seed.

The longer answer:
The BCCAPI server backend needs to know in advance which public keys to track in the block chain (this is a limitation imposed by the way the server backend is implemented  as it is built on top of BitcoinJ), so to do this it needs to know which set of keys are related to a given wallet.
To do that the BCCAPI manages two types of keys:

• Wallet keys - Each wallet has one, and it allows you to add Bitcoin public keys to your wallet. This key is used when "logging in" to the BCCAPI server and makes sure that you are representing the wallet that you want to add keys to. This could have been done with a traditional username/password login, but there is really no need as we are already dealing with much stronger keys and have a place to store them.
  
• Bitcoin keys - These are the traditional keys that you send/receive bitcoins with.
  

A wallet built on top of the BCCAPI has one 256-bit seed, and from that 1 wallet key is generated and one or more Bitcoin keys.
BitcoinSpinner currently only allows you to manage one Bitcoin key. This was a decision I made to make the app faster and simpler to use and manage.
So this means that BitcoinSpinner has one wallet key and one Bitcoin key. When you do a backup you backup the seed that allows you to generate those two keys again. When you do an export you only export the Bitcoin key.




Clever. But have in mind that the password has to be really strong (ideally as strong as a 256 bit random string), and you have to remember it.
The first prototype of BitcoinSpinner actually based the seed on a password and salt. But I found it cumbersome and less secure, as people are inclined to enter short week passwords.

I do my backup like this:
1. Take a picture of the backup-QR code with my camera
2. Print it out on paper from my computer
3. Put the paper in an envelope

Having the backup QR-code on paper allows me to quickly switch between a savings and spending wallet.

If you do not trust the backup/restore functionality try it with 0.1 BTC or ask some of the other 500 forum members who use it.
Back to topic.

I am soon going on vacation and have been thinking about a small project to do. Now, my wife has declared that there will be no coding going on.
Reading your post gave me this brilliant idea. My project will be to make a BitcoinSpinner guide. I'll make a PDF that will link from BitcoinSpinner's Settings -> Help option. It will basically be a HowTo describing best practices on how to secure your coins using BitcoinSpinner.
I'll throw in a section describing my motivation to make BitcoinSpinner as a free service that costs me $130 to keep alive every month and countless hours.

 

Please don't get me wrong. Allowing you to enter an amount in for instance USD instead of BTC is a very relavant feature, which I am going to add. However, taking exchange rates from multiple exchanges into consideration is not high on my list.

Interesting, do you have a link? Is MultiBit using the XChange project?

On single point of failure: If MtGox is down BitcoinSpinner will still work. The amount in your local currency will simply not show. I wouldn't call this a failure.
Right now MtGox is defining the market price as they have more business than the rest of the exchanges combined. I am not saying that I won't look into this, but there are other features that are higher on my list.

Ahh... I am closer to you than you think. Mountain View is just south of SF 
We do not have the Euro in Denmark, but we are part of the EU. Slightly confusing. The Danish currency has however been locked to the Euro for years, and before that to the German Mark. So we have all the trouble of not having the Euro, while none of the benefits.
OK, back on topic.

Sorry, I didn't get much sense out of your reply.
Anyway, I don't know where you live, but visiting Denmark on the way to Dubai is for most people not exactly on the route.
(BTW: Denmark is not exactly a continent.)

Atlas is back