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961  Bitcoin / Development & Technical Discussion / Re: Bitcoind taking up 380megs or more.. ?? on: August 02, 2013, 07:08:08 PM
You have the memory available. This is likely LevelDB using caches and write buffers to speed things up. Some may want Bitcoin to minimize it's RAM usage, while others may want Bitcoin to run as fast and low latency as possible, so there is no right answer; the default LevelDB memory parameter options are used.
962  Other / Beginners & Help / Re: Metastock on: August 02, 2013, 03:06:26 PM
the file format is invalid for meatstock importer

The file format I created is not specific to any program. You'll have to convert the format/columns yourself.

A newer source of exchange data is here: http://api.bitcoincharts.com/v1/csv/
963  Bitcoin / Technical Support / Re: Does it neccesary to backup wallet every time? on: July 30, 2013, 08:32:45 AM

What's your suggestion for back up period?
After you have done 50 total of these or any actions which deplete an address from the key pool:

- Manually create a new address in Bitcoin
- Send money to someone
964  Bitcoin / Technical Support / Re: [Question] Transactions on current block on: July 30, 2013, 08:28:54 AM
Bitcoin maintains a memory pool of all valid transactions that are waiting for a block. This contains all transactions that are valid and at least meet the minimum anti-spam fee rules. It also includes "orphan" transactions, which are not yet funded by a payment in the blockchain. These are relayed to other Bitcoin nodes when first seen.

When mining, Bitcoin assembles a sub-set of the memory pool transactions into a block (there may be some or many memory pool transactions that won't fit in the structure of the current block with the miner's rules), and keeps mining the same block data until there are new transactions and it's been over 60 seconds, if 4 billion hashes are done, if or if a new network block is announced.

Main.cpp
Code:
           // Check for stop or if block needs to be rebuilt
            boost::this_thread::interruption_point();
            if (vNodes.empty())
                break;
            if (nBlockNonce >= 0xffff0000)
                break;
            if (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60)
                break;
            if (pindexPrev != pindexBest)
                break;

Only when these conditions happen is a new Merkle tree built and a new block assembled with another set of transactions (if the block is full, transactions can be bumped out of the temporary block by newer ones with higher priority or more fees). A flood of transactions won't create a CPU denial-of-service attack.

The transactions (and other block data) that would be included in a block by your Bitcoin is available for your viewing with the Bitcoin RPC command getblocktemplate.

When mining for a pool, their Bitcoin assembles blocks the same way (although they may have tweaked the rules). The only difference is pools have an additional layer of software that assigns work to specific miners and keeps track of what miners are working on, and will reject unassigned work submissions.
965  Other / Beginners & Help / Re: Why can't I reply to PM's on: July 25, 2013, 06:50:10 AM
If you are a noob and someone is PMing you out of the blue, chances are it's a spam or a scam anyway.
966  Alternate cryptocurrencies / Altcoin Discussion / Goodbye copycoin boards - you are now ignored. on: July 25, 2013, 06:41:09 AM
"Alternate cryptocurrencies" (with the exception of Namecoin and it's novel namespaces) offer nothing. It's just a bunch of [ANN] SHITCOIN! threads where somebody else thinks they'll get rich by conning losers into their recompile of Bitcoin with a few constants changed. If they didn't break the code themselves with ill conceived ideas, it will be attacked or abandoned anyway. A complete waste of my time. A complete waste of the Bitcoin forum's time.

Profile ->
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967  Other / Beginners & Help / Re: how do i earn bitcoin on: July 24, 2013, 10:02:27 PM
buy some aspics and mine! Wink

968  Other / Politics & Society / Re: Do You Think Bitcoin Could Have Existed in the 90s? on: July 24, 2013, 08:58:51 AM
My 1995 Win95 computer had 8mb ram, a 512mb hard drive, and a Pentium 75. So much of Bitcoin - the block chain, mining, verifying transaction signatures, indexing balances - is way beyond the computational power of common computers at the time. If you were to start Merkle tree and signature verification of the current blockchain on such a computer now, it is likely it would never catch up. It is possible that if launched with the birth of the popular internet, it may have had small and slow adoption that technology could keep up with - and 93% of the bitcoins would already be mined.

In addition, the cryptography in Bitcoin wasn't available; it would be based on then state of the art DSA with SHA-0, SHA-1, and/or MD5. However, the digital cash and proof of work research done by many all the way up to the time of Bitcoin's launch still never put the pieces together, and the software tools and libraries were not there; I can't imagine writing crypto and database libraries fit for the job from scratch in 16 bit Borland C++. You would have a better chance of making a working light bulb and generator for the Pharaoh than a practical working Bitcoin 18 years ago.
969  Other / Beginners & Help / Re: Newbie notification on: July 23, 2013, 09:01:48 AM
When you register for a new account, the very first paragraph says:

Quote
RESTRICTIONS FOR NEW MEMBERS

After registering, you will be unable to post in any section except "newbies" until you have spent some time on the forum and have published a few posts.

If you are registering to ask a question, please ask it in the newbies section. Do not wait to ask it just because you must post it in "newbies": the question is very likely to have already been asked. If you don't end up getting good responses, you can ask it again elsewhere after you are established, or you can move the entire topic.

If you are commenting on Bitcoin, use your newbie wait time to read more about Bitcoin. If you are criticizing Bitcoin, find similar criticism using the search tool to see which points have already been covered. A good use of your newbie wait time is reading Satoshi's old posts.

Then the checkbox you must check at the bottom to register says:

Quote
I understand that I will initially be unable to post to most forum sections, as explained above.

Then there is a sticky note at the top of the newbie forum. It is impossible to make people read, apparently.

You can't make people read. Or search.

Maybe the new member captcha should be that they have to type the phrase in the box: "I can only post in the newbie forum".
970  Bitcoin / Mining support / Re: What exactly is pool hopping? on: July 23, 2013, 08:48:33 AM
The original paper: https://bitcointalk.org/index.php?topic=3165.0

In the beginning, all pools were proportional - when a block was found, pools immediately paid out the block reward to miners based on their contribution since the start of block hunting. If a block was quickly found, then miners would get higher earnings per amount of work submitted. The strategy is to "hop" to a new pool as soon as they find a block and start a new round of block finding, hoping for an early block find, then abandoning that pool as soon as another pool starts a new round. By doing so, you are investing your mining work in pools only when there is an above-average reward potential.

It is bad because it reduces the income of full-time miners - they get less work submitted during the profitable times and are left mining alone on long blocks.
971  Other / CPU/GPU Bitcoin mining hardware / Re: Estimate of CFM that 80mm GPU fan on MSI 7950 produces on: July 23, 2013, 08:26:01 AM
It is important to have case fans that do their job. Consider that the GPU fan sucks air from inside the case and blows it out the back slot of the card:

1. The hot air vented out the back should not be sucked back into the case - an empty card slot without a plate will allow hot air back into the case.
2. Power supply and case fans that blow out actually compete with the GPU fan. Consider a hypothetical super-strong case fan venting out - it will be pulling air into the case through any intake source available, including backwards through the GPU.

I found good success with 200mm 700RPM fans, they are quiet but move a lot of air. Set them up in the side of the case (or make a new case side out of posterboard with this 8" fan mounted) so they blow in, and they will enhance the GPU cooling by providing fresh air with the correct airflow direction. Ideally you'd have all case fans blowing in from the front and side, and the only outlet for air being through the GPU (and some CPU->Power supply airflow, but if your CPU is making much heat, you have a badly spec'd rig).

I actually have two of these fans I'm not using for rigs anymore that I could part with.
972  Economy / Trading Discussion / Re: SierraChart bridge - Realtime Bitcoin charts [v0.5] (MtGox, Intersango, ...) on: July 21, 2013, 09:11:09 AM
Can you add a option to export the data to CSV
There are already csv files for you to download at http://api.bitcoincharts.com/v1/csv/

Added:

SierraChart can export data into CSV format for you, after opening your exchange, choose Edit-> Export Intraday data to txt file. It exports to CSV in this format:

Code:
Date, Time, Open, High, Low, Last, Volume, Number of Trades, Bid Volume, Ask Volume
08/03/2013, 03:54:45, 104.00497, 104.00497, 104.00497, 104.00497, 1655, 1, 0, 0
08/03/2013, 03:54:46, 104.00502, 104.00502, 104.00502, 104.00502, 4244, 1, 0, 0
08/03/2013, 03:54:55, 104.00502, 104.00502, 104.00502, 104.00502, 1, 1, 0, 0

Note that these volumes are 100x larger than actual.
973  Other / Beginners & Help / Re: How to run the bitcoin demon for a dice site? on: July 19, 2013, 10:52:31 PM
I wonder... how would a bitcoin demon look like an what would he do? Reverse transactions and in somewhat misterious and unknown way make bitcoin centralized?

974  Economy / Currency exchange / Re: I would like to buy BTC via Paypal. on: July 19, 2013, 10:21:17 PM
Topic: Offering PayPal for Bitcoin? You're likely to be labeled a scammer - Read why.

Especially with an account that looks like it was bought for free coin giveaways.
975  Economy / Trading Discussion / Re: SierraChart bridge - Realtime Bitcoin charts [v0.6.21] on: July 19, 2013, 09:47:34 PM
New version of Sierrachartfeed and direct-download history files, now with old exchanges for your entertainment

Update 021:
  • Corrected crash downloading trade data with negative volume amounts in history (btc24EUR and ruxumUSD),
  • Fixed downloading of symbols with no recent trades for months (undocumented API issue),
  • Error handling of blank or invalid exchange symbols,
  • Faster history download on long periods of no trades.

Update 020:
-Tweak data request sizes.

Update 019:
-Fix error on initial request too large.

Update 018:
-All times in UTC instead of local time (allows easy data file interchange with other users and comparison with other ticker sources),
  REQUIRED: remove all existing C:\SierraChart\data\*.scid files before using this new bridge version.
-properly close IP sockets (not a fix for all 502 errors, apparently)
-faster update,
-remove about 1-5MB of redundant downloading at initialization,
-cosmetic tweaks: error stats and download times on console.

Code:
Usage: sierrachartfeedUTC-0.6.021.exe [options]

Options:
  -h, --help            show this help message and exit
  -d DATADIR, --datadir=DATADIR
                        Data directory of SierraChart software
  -y, --disable-history
                        Disable downloads from bitcoincharts.com
  -p PRECISION, --volume-precision=PRECISION
                        Change decimal precision for market volume.
  -s SYMBOLS, --symbols=SYMBOLS
                        Charts to watch, comma separated. Use * for streaming
                        all markets. (default = mtgoxUSD only)
  -l HISTORY, --history=HISTORY
                        Maximum days of history to retrieve (default = 14).
note: when using the single-letter option, there is no space between the option and the parameter


Download links:
(new version available)/sierrachartfeedUTC-0.6.021.exe (3.9MB) (windows 32 bit standalone exe)
MD5: fb686793172f142ecdb2150d701c9c99 *sierrachartfeedUTC-0.6.021.exe

http://we.lovebitco.in/schart/sierrachartfeedUTC-0.6.021.py (python 2.7 source - needs github files also)

SCID full history files:
from first recorded trade to Wed, 21 Aug 2013 23:59:59 GMT:
(extract to C:\SierraChart\data\ before starting SierraChartfeed)

MtGox only: http://we.lovebitco.in/schart/mtgoxUSD.scid.UTC.7z (22.6MB/227MB)
  • mtgoxUSD
Other current exchanges: http://we.lovebitco.in/schart/otherALL.scid.UTC.7z (19.0MB/200MB)
  • bit2cILS, bitboxUSD, bitcashCZK, bitcurexEUR, bitcurexPLN, bitkonanUSD, bitnzNZD, bitstampUSD, btcdeEUR, btceEUR, btceRUR, btceUSD, btchkexHKD, btcnCNY, cbxUSD, crytrEUR, crytrUSD, fbtcEUR, fbtcUSD, fybseSEK, fybsgSGD, icbitUSD, intrsngEUR, intrsngGBP, intrsngPLN, justLTC, justNOK, justXRP, kptnSEK, localbtcEUR, lybitCAD, lybitUSD, mrcdBRL, mtgoxAUD, mtgoxCAD, mtgoxCHF, mtgoxCNY, mtgoxDKK, mtgoxEUR, mtgoxGBP, mtgoxHKD, mtgoxJPY, mtgoxNZD, mtgoxPLN, mtgoxRUB, mtgoxSEK, mtgoxSGD, mtgoxTHB, rippleEUR, rippleUSD, rippleXRP, rmbtbCNY, rockEUR, rockSLL, rockUSD, vcxEUR, vcxUSD, virtexCAD, virwoxSLL, weexAUD, weexCAD, weexUSD
Past/retired exchanges (Tradehill, etc): http://we.lovebitco.in/schart/historic.scid.UTC.7z  (3.4MB/32.9MB)
  • aqoinEUR, b2cUSD, b7BGN, b7EUR, b7PLN, b7SAR, b7USD, bbmBRL, bcEUR, bcGBP, bcLREUR, bcLRUSD, bcmBMAUD, bcmBMGAU, bcmBMUSD, bcmLRUSD, bcmMBUSD, bcmPPUSD, bcmPXGAU, bcPGAU, bitchangePLN, bitfloorUSD, bitmarketAUD, bitmarketEUR, bitmarketGBP, bitmarketPLN, bitmarketRUB, bitmarketUSD, bitmeUSD, bitomatPLN, britcoinGBP, btc24EUR, btc24USD, btcexEUR, btcexJPY, btcexRUB, btcexUSD, btcexWMR, btcexWMZ, btcexYAD, btctreeUSD, cryptoxAUD, cryptoxUSD, exchbUSD, freshPLN, globalEUR, globalGBP, globalPLN, globalUSD, imcexEUR, imcexUSD, intrsngUSD, ruxumAUD, ruxumCHF, ruxumEUR, ruxumGBP, ruxumHKD, ruxumHUF, ruxumJPY, ruxumPLN, ruxumRUB, ruxumSEK, ruxumSGD, ruxumTHB, ruxumUAH, ruxumUSD, ruxumZAR, snwcnXRP, thAUD, thCLP, thEUR, thINR, thLRUSD, thUSD, wbxAUD
976  Economy / Speculation / Re: Satoshi Dice Buy out: 126,315 BTC! Payout to be released to share holders! on: July 18, 2013, 07:03:39 PM
Why is this site worth so much?
Completely easy to replicate.
Are bitcoiners so degenerate in their gambling?
It's not even poker.

Why are the bitcoins used to buy the site worth so much?
Completely easy to replicate.

Think about this too much, and you can ask the same of most companies. AOL was worth $350 *Billion* dollars to Time Warner? Huffington Post was worth $315 Million to AOL? Just as much nonsense.
977  Alternate cryptocurrencies / Service Announcements (Altcoins) / Re: Just-Dice.com : Invest in 1% House Edge Dice Game on: July 18, 2013, 06:52:00 PM
But max bet should be somewhere 0.1% -0.2% (and you know that whales are often smarter than the little guy betting).

The site has a fixed 1% edge. There is no such thing as a smart bet, big or small.

The smart bet is the one you don't make after a series of dumb bets got you up 900BTC.
978  Bitcoin / Technical Support / Re: bitcoin-qt falls back to 8 connections after some time on: July 18, 2013, 06:42:01 AM
On my DSL connection, if my ip gets changed (usually pppoe reset), the connection count will drop to 8. Probably has something to do with the client not updating its external IP. The only real solution is to prevent your internet from dropping out. If you think your ISP is blocking bitcoin, an external port scan on TCP 8333 should tell if it's really the case.

That appears correct, the code in net.cpp GetMyExternalIP seems only to be called upon startup. External IPs changing on an always-on connection should only affect a few users, perhaps a command line option to enable periodic polling of external IP would be the solution, so not everyone is hammering external IP service providers unnecessarily by default.
979  Bitcoin / Technical Support / Re: Will 256 mb usb be enough to hold a LITE client ? on: July 18, 2013, 05:47:09 AM
You can certainly store a wallet file on that size of USB, however a bootable OS with a lite client would be a stretch. One could start with tiny core linux http://distro.ibiblio.org/tinycorelinux/downloads.html - then install extra software on it.

If you want to sell them, just sell them as 256MB drives, you don't need to make promises about what people can do with them.
980  Bitcoin / Development & Technical Discussion / Re: Forking scenario - when border connections are closed on: July 17, 2013, 10:47:11 PM
It would only take one person smuggling a blockchain copy on a USB flash disk across the border to catch everybody up in censor-stan. Spending money (smuggling out transactions) would be a bit harder though; you'd have to get out a hibernated laptop with cached transactions or such.

The mining power of an isolated area would be much less than the rest of Bitcoin, they would only need to know to not trust payments in any locally mined blocks if they happen during isolation.

Deepceleron's razor #17: If something is worth saying to a noob, deepceleron has probably already said it.
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