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161  Bitcoin / Development & Technical Discussion / Re: How To Correctly Poll New Blocks for Payments? on: August 24, 2012, 02:15:27 AM
Just announced: https://bitcointalk.org/index.php?topic=102740

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The purpose of BTC Sniffer is the add an easy way to listen to Bitcoin Network events and facilitate extensions...
162  Other / Off-topic / Re: Looking for powerful dual monitor Linux Workstation. on: August 20, 2012, 10:26:28 AM
As much as I enjoy open source, I'm more concerned with performance at this point. So closed source drivers would work for me.

The performance of the open source drivers is fine for desktop use.  You'd only care for gaming.  However, the closed source drivers have a convenient control panel:

https://lh3.ggpht.com/_Lb-i_VCD1tE/SvCmBK29usI/AAAAAAAAANg/MCkrQ1gv66Q/s400/nvidia-settings.png

It makes it a piece of cake to set up the "span" type desktop like you want.


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At the moment i'm using a 5770 ATI Card with the ATI Properietary Driver. Could check the version if anyone wanted to know.

My 5770 is glitchy on Linux just like you described with the ATI closed source drivers.  The card is fine; the drivers just suck.


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So nvidia card(s) is the recommended solution, over ATI cards ?

Yes.  ATI's drivers are less-good on Windows and just terrible on Linux.
163  Bitcoin / Development & Technical Discussion / Re: no balance per address shown in bitcoin-qt? on: August 18, 2012, 01:33:26 AM
You may be interested in this:  https://coderrr.wordpress.com/2011/06/30/patching-the-bitcoin-client-to-make-it-more-anonymous/
164  Other / Off-topic / Re: Looking for powerful dual monitor Linux Workstation. on: August 18, 2012, 01:32:06 AM
I suggest using TwinView on a multihead nVidia card.  I've been using that on my Ubuntu desktop for a few years and it works great.  I've had problems with ATI cards having graphics glitches like you describe.

Just like on Windows, it comes down to getting a card with good drivers.  nVidia's binary drivers are excellent and fast, but closed source.  nouveau (the open source driver) tends to work well, but has less features and is slower.  ATI's drivers are kind of marginal.  Intel's cards work very well, but they're only on integrated chipsets.  It's a shame they don't make a multihead card.

What are you using now?
165  Alternate cryptocurrencies / Altcoin Discussion / Re: DoS attacks on proof-of-stake on: August 17, 2012, 04:50:32 AM
Adding a small proof of work would probably solve it.  Include a timestamp and nonce in the block, take a SHA256 of the whole thing, and set the difficulty so that it's a few million times harder to generate than to verify, and don't accept blocks that are more than a few minutes old.  The difficulty could be static because there's no need to keep up with Moore's law - it doesn't really matter if they can produce bad blocks more quickly in the future because the cost to verify will also decline.
166  Bitcoin / Development & Technical Discussion / Re: Should bitcoin lower the transaction fee? on: August 17, 2012, 12:42:10 AM
I suggest the transaction fee should be kept as low as possible while preventing the blockchain from growing at an unreasonable rate.

Long term it may be necessary to use it to encourage mining for security, but that's not a concern until generation is much lower.
167  Bitcoin / Bitcoin Technical Support / Re: HOW TO RESTORE WALLET on: August 16, 2012, 07:34:57 AM
First install one of:

x86: http://www.python.org/ftp/python/2.7.3/python-2.7.3.msi
x64: http://www.python.org/ftp/python/2.7.3/python-2.7.3.amd64.msi

Then install one of:

x86: http://twistedmatrix.com/Releases/Twisted/12.1/Twisted-12.1.0.win32-py2.7.msi
x64: http://twistedmatrix.com/Releases/Twisted/12.1/Twisted-12.1.0.win-amd64-py2.7.msi
168  Bitcoin / Bitcoin Technical Support / Re: HOW TO RESTORE WALLET on: August 16, 2012, 06:51:45 AM
Install Python and Twisted (see directions at the bottom of that page), then:

pywallet.py --datadir=WHEREVER --dumpwallet
169  Bitcoin / Bitcoin Technical Support / Re: HOW TO RESTORE WALLET on: August 16, 2012, 05:27:54 AM
You can use PyWallet to extract the keys, then you can import them into any wallet.

https://github.com/jackjack-jj/pywallet
170  Bitcoin / Bitcoin Technical Support / Re: About generation of a bitcoin address on: August 14, 2012, 06:30:40 AM
https://bitcointalk.org/index.php?topic=25804.0P
171  Bitcoin / Development & Technical Discussion / Re: Copying Bitcoin vs using bitcoind to send on: August 14, 2012, 01:37:44 AM
If you're just accepting payments, you don't need the private keys to be online at all.  Just generate a bunch of keypairs then copy ONLY the public keys / Bitcoin addresses to the server.  When people send you payments you can watch for them by address.  You can then transfer the funds later using a secure PC, IE one that isn't connected to the web site at all.

Edit: Here's a useful tool to create bulk addresses: https://www.bitaddress.org/bitaddress.org-v1.6-SHA1-162d1ff4fd1e09222cbaca6c282672ee6c195e1b.html
172  Bitcoin / Development & Technical Discussion / Re: confirmation speed on: August 07, 2012, 05:45:32 AM
No, transactions are all put into the same pool regardless of where they come from.  However, you may be interested in "green addresses": http://bitcoin.stackexchange.com/questions/1730/what-are-green-addresses
173  Bitcoin / Bitcoin Technical Support / Re: track blocks on: August 07, 2012, 01:25:41 AM
bitcoind does what you need.  From "bitcoind --help":

  -blocknotify=<cmd> Execute command when the best block changes (%s in cmd is replaced by block hash)

Then whenever you're notified of a new block use getreceivedbyaddress or listreceivedbyaddress to see if your address has received anything.


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is there any way to get a json representation of a specific block which includes all transaction in it?

Yes, getblock does exactly that.
174  Bitcoin / Bitcoin Technical Support / Re: Bruteforcing an encrypted wallet on: August 02, 2012, 08:37:53 PM
Yes, I have a brute forcing script.  It takes your best guess at a key and then cracks one mistaken character within an hour, or two mistakes within a few weeks.

Get it here: https://bitcointalk.org/index.php?topic=85495.msg942171#msg942171
175  Bitcoin / Development & Technical Discussion / Re: BIP Draft - Instant Partial Confirmation on: August 01, 2012, 04:46:53 AM
Related: https://bitcointalk.org/index.php?topic=62137.0;all

tl;dr: instead of trying to connect to every miner everywhere, you simply send your transaction over the network with a generous fee.  Miners include a pubkey with each block, and if they consider your fee sufficient, they use that key to pre-confirm your transaction, and flood that signature.  Pro: simpler and faster; con: more p2p traffic.
176  Bitcoin / Development & Technical Discussion / Re: Blockchain size, exponential growth? on: July 23, 2012, 05:12:22 AM
I doubt 1gb will be that expensive in the future to store, storage capacity is still growing faster than blockchain size.

Hard drives double about every two years.  If the block chain is doubling every year then it will become a problem.

Transaction fees are currently very low to help adoption, but I think it's inevitable that they will have to be much higher in the future.
177  Bitcoin / Electrum / Re: Looking for better USB drive wallet solution other than Electrum on: July 21, 2012, 11:38:51 PM
Hm, I thought that it had the ability to sync to a random node.  I guess not.  Sorry.  Smiley
178  Bitcoin / Electrum / Re: Looking for better USB drive wallet solution other than Electrum on: July 21, 2012, 10:47:07 PM
http://bitcoinarmory.com/
179  Bitcoin / Bitcoin Technical Support / Re: linux-finally had it with microsoft any advice on: July 21, 2012, 03:35:11 PM
LFS is great if you want to learn how things work, but I think he's looking more for a no-hassles, easy to use system.
180  Bitcoin / Development & Technical Discussion / Re: Proposal 1:10 split, every block reward halves. on: July 20, 2012, 07:03:04 PM
Technically it's not that hard to do, but I don't think it's a problem that needs to be solved, and it creates a whole bunch of new problems like having to compare split history to make sense of past discussions.

It's much easier for people to use "bitcents", "millibtc", and "microbtc" if and when the need arises.
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