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1  Bitcoin / Bitcoin Discussion / Armory Companion: Keep your offline wallet isolated on: February 09, 2014, 11:16:44 PM
Have you ever wanted to completely isolate your private keys from networks and removable media?  Armory nearly accomplishes this, but still requires removable media to move the transaction content back and forth.  I've created an Android app called Armory Companion that allows you to broadcast signed transactions on the bitcoin network after signing with your offline Armory instance (or any other bitcoin instance for that matter) using QR code scanning.  There are some tiny python scripts that run on the offline computer to facilitate QR code scanning with the webcam and generation of the final signed transaction QR code.

See this video for a demonstration of how it works: http://www.youtube.com/watch?v=ZlSC3mLjNSg

This post shows that this is something other people want, so I figured I'd share it:
http://bitcoin.stackexchange.com/questions/8101/how-to-sign-a-transaction-using-only-offline-computer

The code is here:

https://github.com/hank/armorycompanion-python
https://github.com/hank/armorycompanion

Feel free to fork and modify as you desire.  The app will be on Google Play soon.
2  Bitcoin / Mining speculation / Re: Mining at Home dying out on: December 29, 2013, 05:32:31 AM
Get an electrician to put in an L6-30R, which will do 220V 30A (6KW or so).  It only costs a few hundred $.
3  Economy / Computer hardware / Re: [WTS] 12 SC 60's BNIB Ready to Ship Now Offers on: December 12, 2013, 06:39:34 AM
So you price is somewhere between what you paid and what I can buy them for from BFL today?

so between BTC1.3 and BTC2.6 each?

Yes?

Even at 1.3 not worth it for less than BTC0.5 profit

http://mining.thegenesisblock.com/a/870468cb7d

Thought my offer was fair.

I'd suggest Ebay

You have no idea how to use that calculator.
4  Bitcoin / Bitcoin Discussion / Re: Paper wallets from Mac on: December 05, 2013, 04:55:51 AM
With BitAddress, I can see you kinda have to choose, I would rather keep my private key unencrypted (offline that is) than have it generated by RNG and encrypted.. (I hear great things from great people about the Armory wallet used on an offline computer, perhaps that is worth looking into)

Also, why TrueCrypt? Isn't Gpg more suited for this?

I think last time I looked into Armory it was windows only?  Doesn't it also fetch the entire blockchain?  I already run Bitcoin-Qt so maybe that's why I started exploring other options.  But I'll take another look...

As for Truecrypt, I'm just using it to encrypt a drive.  I'm not familiar with Gpg or encryption standards in general really.  Why would it be better?

Armory's not windows only - works in Linux and I even recently tried an OSX version, but it's not "there" yet.  I does fetch the blockchain using bitcoind, so if you've already done that, you're good.  I really like multibit - even in the Linux machine I use for bitcoin it works great.

Truecrypt will help if your computer gets stolen, but if you get hacked while it's running (much more likely) then they'll be able to keylog you and get your bitcoins.

Consider getting VMWare Fusion and making a rather hardcore Linux VM to keep your coins in.  It provides yet one more layer hackers would have to get into to get your money.
5  Bitcoin / Hardware / Re: Least reliable company? on: November 24, 2013, 07:19:56 PM
I'd still rather get what I ordered late than half my money back.  And they gave refunds until June and very publicly stated that they were stopping refunds to enter production.
6  Bitcoin / Bitcoin Discussion / Re: An Electronic Currency That Could Save The Economy - And It's Not Bitcoin on: November 24, 2013, 07:10:17 PM
I really hope they take it seriously and implement demurrage in the USD.  That would send people to BTC in DROVES.
7  Bitcoin / Bitcoin Discussion / Re: Lmao @ people buying subway and etc w/ BTC!!! on: November 24, 2013, 07:08:22 PM
I love how short-sighted this argument is.  Here I'll make it really simple:
  • Buy something with BTC
  • Open coinbase and buy the same amount of coins back
That should answer your question.
8  Bitcoin / Hardware / Re: Least reliable company? on: November 24, 2013, 05:18:42 PM
I didn't buy Terrahash, but here's the outcome if I had:
Hashrate delivered
CompanyHashrate delivered and running
BFL540GH/s
Terrahash0GH/s
So, it comes down to what "reliable" means.  LOTS of BFL customers are hashing with their hardware, and ZERO Terrahash customers are hashing with their hardware.  Sure, BFL was super-late, possibly lied through the process, produced a few duds (I have a slow one myself), produced and shipped units REALLY slowly, but in the end, they did deliver, and I'd say that's more reliable in the end than a company that goes under and can't even fully refund everyone.  Of course, you're right that there's just more BFL customers, so maybe proportionally Terrahash customers are more upset about Terrahash than BFL.  All of my BFL hardware has more than ROI'ed in USD (yeah yeah I know it will never ROI in BTC opportunity cost).

Of course, you could say Terrahash's statements were more reliable than BFLs - I agree there.  It's just that one of those statements was "we're done and you don't get your money back."  That is a pretty reliable statement.
9  Bitcoin / Hardware / Re: 3 TH/s Bitcoin Mining Hardware KL-YUG by KotakLabs on: November 24, 2013, 04:52:20 PM
Quote
If calculate for delivery time in march next year, the average expected difficulty could been 5,941,344,136
Quote
You don't seriously believe that we will be anywhere near 609m difficulty in 4 months, do you?
5.9 billion looks like a decent estimate to me.  I think it might even be a little high.
10  Bitcoin / Hardware / Re: Xtreme miners - scam? on: November 24, 2013, 04:43:06 PM
Here's the response I got when I asked some questions about their hardware:
Quote
Thank you for your mail!

You are asking about a lot of detailed information here, which we didn’t put out on purpose – we don’t want to make the same mistake Avalon did, they didn’t protect all their Data well enough so that there are now „avalon clones“ available on the market. We need to avoid plagiarism here, that’s why I am not allowed to send any pictures of prototypes or any drafts and informations about the production per e-mail. I am sure you can understand this.

We are the first german company to build bitcoin miners, so obviously we want to stay unique.

Yes, we do have an investor who provided us with enough money to at least start the production, the rest is gained from our pre-orders. The company owner, Jorge Berg, is currently on a business trip where he is aquiring ven more investors.

Kind Regards, Team Xtreme Miners
They didn't protect their data well enough?  THEY SOLD THE CHIPS TO MAKE THE CLONES!  Apparently they don't even understand what happened here.
11  Other / Politics & Society / Re: is this crowd fundin for ross ulbrich a joke? on: November 24, 2013, 09:14:41 AM
What is the funding for?  He can get a public defender.  The evidence against him is massive anyway, so what's money going to help with?
12  Bitcoin / Hardware / Re: Least reliable company? on: November 24, 2013, 09:10:06 AM
How is terrahash not winning this poll?  BFL shipped, Terrahash can't even refund half of customer's money.  We're talking about reliability here, not lateness.
13  Bitcoin / Hardware / Re: BitForce Single SC 60GH/s mining lower on: November 24, 2013, 09:08:01 AM
I only got 517GH/s from the 540GH/s I ordered from BFL.  Undecided
14  Bitcoin / Hardware / Xtreme miners - scam? on: November 24, 2013, 03:10:08 AM
http://www.xtrememiners.net/

Looks a little scammy to me - especially the projected performance - 0.3J/GH @ 28nm?  That sounds a bit low.
15  Bitcoin / Bitcoin Technical Support / Re: bitcoin error on: November 24, 2013, 02:55:23 AM
Get pywallet
Use the recovery features
https://github.com/jackjack-jj/pywallet

Another thing you can try is moving aside the wallet.dat file (back this up somewhere while you're at it), then moving the entire Bitcoin directory aside, and starting bitcoin again to force it to recreate the directory.  Then, close bitcoin, and move a copy of the wallet.dat back over the newly created one.  The only important file is the wallet.dat, so as long as you keep a good copy of that around, you can get the coins back.
16  Bitcoin / Mining speculation / Re: $12366, first data point. on: November 23, 2013, 06:36:54 AM
Yes, but the price for 1 Bitcoin might be +$10,000 by Christmas at this rate! Grin
I'd take that as my gift this year!  Cheesy
17  Bitcoin / Mining speculation / Re: Difficulty speculations by March 1 2014 on: November 23, 2013, 06:30:43 AM
2-3 Bil is my estimate, based upon estimated ship dates of various manufacturers.
18  Bitcoin / Hardware / Re: CoinTerra announces its first ASIC - Hash-Rate greater than 500 GH/s on: November 23, 2013, 06:18:19 AM
There is no evidence of Cointerra's tape-out, and even if it were the truth, it is by no means their only challenge whilst trying to complete this project. All sorts of other problems can cause delays, and there is no real way to know which of these problems are real and which are concealing embarrassing oversight of something simple. BFL played that exact same game with their customers; anytime a delay was announced it was attributed to somehting highly technical, and never to something as prosaic as bad contingency planning in their material requirements.
Correct, Cointerra tape-out press release was a lie, and they lie about other things too
Just quoting this for posterity so I can laugh really hard at it later.
19  Bitcoin / Hardware / Re: CoinTerra announces its first ASIC - Hash-Rate greater than 500 GH/s on: November 23, 2013, 02:46:09 AM
Quote
record conversations as I have already been doing,

Unless you asked for their consent to record, you may have violated the law in recording the phone call:

http://lifehacker.com/5491190/is-it-legal-to-record-phone-calls

You're good if you don't live in those states though.
20  Other / Politics & Society / Re: 2013-11-15 Metro (UK) - Teen dies on Skype after buying drugs on Silk Road on: November 19, 2013, 08:24:14 AM
This just in!

Promising computer programmer eats pizza bought with bitcoins!


GASP!
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