Maybe a backup was automatically created. Check the multibit-data folder where your wallet is stored.

I didn't know Multibit allowed you to remove a receiving address. What version are you using?

1. Just select the address from the list, and write in the Label field in the upper section. They will be saved automatically
2. As far as I know, that's not possible. I had to copy them one by one.

I think Multibit generates a new address in case you only have one, but it's shown in the same list, so it doesn't get lost.

Usually open-source software is published in public repositories such as GitHub, so it can be easily found and modified.

How secure is it to use this wallet? Where are the private keys stored?

I want to announce that I've started developing a SPV library for .NET (basically a port of bitcoinj). Currently it's largely incomplete, but I would appreciate anyone's help on the development.

Here's the link of the project, hosted in CodePlex: https://bitcoinspvnet.codeplex.com/

I think that would make sense only if you genuinely think you can get more money selling the website than making your project.

Being Chinese doesn't automatically mean it's crappy. On the other hand, the “wipeout after 10 failed logins” is what it actually scares me. This means I MUST have a backup somewhere, rendering this device useless.

I'm sorry to disappoint you, but the laser that goes pew pew is used to ENGRAVE YOUR NAME on the device. It's not part of it.

The machines are achieving sentience... and are using it to insult everyone :O

Using Webkit or Gecko anyone can these days.

I plan to release it in the same Apache License that bitcoinj is (but I haven't looked at all the legal implications).

I think it was me who didn't give a complete answer. It's more of a technical limitation. Since .NET Portable Class Libraries are designed to work on Windows Store, Windows Phone and Silverlight at the same time, they have access to a limited subset of the .NET Framework. This means that anything specific to one of those platforms (files, system settings, etc) are unavailable.

bitcoinj is written in Java, which is totally unaware of all this, and IKVM provides a conversion to .NET, but as far as I know, IKVM has not implemented yet a conversion to Portable Class Library. I don't how difficult that might be, but obviously I couldn't even do it.

I also ran into the Portable Class Library issue. And in fact I already started to write a port based on bitcoinj (although with both school and work I have almost no time for this). Maybe we can join forces to get it done faster

If you want to write an application that uses SPV, you can port bitcoinj to .NET easily (see this post). If you want to actually write the library from scratch, then I don't know much about it. I think you can study bitcoinj's source code.

You can download the source code and run it on an offline computer. That way they can't possibly log your generated keys.

That depends on which software you are using for each currency. I'm not experienced in altcoins, so I can only give you advice on BTC.

I use Multibit, and so having a portable wallet requires the files multibit.wallet, multibit.info and the folder multibit-data.

Maybe you need to configure your clients with the path to your flash drive so they can find the wallets.

No! Cookie Clicker was hell! I wonder how addicting this will be

Maybe not the government, but look at this article:
Want your paycheck in Bitcoin? Get paid with the BitPay Payroll API

I know this will most likely not happen with Mexican immigrants for many reasons, but this is just an example that you don't have to depend on the government accepting it to use it. You just need that more services emerge that make it easier to use Bitcoin on a daily basis.

In which language will you write it?

In the mean time, an action that requires a password but will not make you spend anything is create new addresses, so you can test it there.