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1  Other / MultiBit / i just lost over 100BTC... on: December 04, 2015, 12:39:23 PM
i had my private keys on paper, it worked for me OK for a long time so spending become a routine
open multibit classic, create new wallet on ramdisk, export keys, edit file entering my private key,
import keys, send btc, close wallet, delete wallet from ramdisk

i never had a problem with this scenario so i didn't even check if the change came back last couple of times

and last time (the day that my son was born - i have been a bit busy that day Wink ) it didn't came back where i expected, but i only found out today

it happened due to fact that
Quote
"When additional private keys are created or imported the second address in the wallet is always used for change."
Code:
source: https://github.com/bitcoin-solutions/multibit/issues/661

and due to recent slight rise in prices i was collecting unspent bits from here and there, imported few keys, transferred few times etc.

for some reason i presumed that change will be always given back to sending address (that was the very reason i choose multibit over regular client back in the days that you could count wallets on fingers of one hand)...

i know that i have only myself to blame, but for f**k sake...
2  Economy / Currency exchange / need to buy small amount of btc asap (preferably irish seller or paypal) on: March 09, 2012, 11:23:46 PM
need around 10 btc, can pay via bank transfer in euros or paypal

and yes, im aware that mtgox exists Wink

3  Economy / Currency exchange / will buy some LTC for BTC / NMC or paypal on: October 20, 2011, 10:12:58 PM
if you have 1k+ of LTC for sale name your price
4  Bitcoin / Bitcoin Technical Support / btc lost in transfer on: July 30, 2011, 03:46:37 PM
i did small transfer between two btc clients
it has some confirmations on sending client



both clients have the same block count, but there is no sign of anything on receiving one



i can see that there is correct address displayed, transaction exists in block explorer with same address http://blockexplorer.com/address/1TaKbwZTBLrj1ad64V6sUJEr1ZhdgghBv

already tried restarting, and copying wallet.dat to another client, no luck

what can i do to investigate further?
5  Economy / Goods / 1340 Mh/s - dual 5970 rig for sale (~650W) 1200 euro - delivered within europe on: June 29, 2011, 05:03:02 PM
two 5970 2GB (one in x16 mobo slot, other one on x1 pcie ribbon extender) both fitted with accelero xtreme coolers
1KW psu - cooler master Silent Pro M1000 certifies 80+ bronze
gigabyte GA-P41T-D3 ddr3 mobo
2GB ddr3 ram
celeron e2200@1.2GHz , arctic cooling freezer 7 pro
250GB 2,5 inch (laptop) WD hdd
ubuntu installed
dummy plugs (if you want to run windows)

i can't say that it is inaudible, but it is a very quiet rig, you can easily sleep in the same room

sucking ~650W from the wall and giving at least 1340 Mh/s (this result is with some overclocking - 760 mhz first and 850 mhz second card) there is still more to get, as i didn't play with gpu voltage, and some cores may be pushed even more (my guess is around 10-15% more to get if you want to play with it)

selling this without a case (i have it in some shitty 10 euro case now)

if anyone want to comment price - you need to spend at least 900 euro at this moment if you want two 5970 with accelero fitted, psu is another 150 euro

if there is someone looking for cards only we probably could make a deal too
6  Bitcoin / Mining support / dual 5970 on windows shows only 3 cores - 1BTC bounty on: June 16, 2011, 06:40:43 PM
i have two 5970, they both work ok separate, but when i put both of them together (pcie x1 and pcie x16, four dummy plugs)
i can see four desktops in catalysts but only have three cypress devices in poclbm

tried both phoenix and poclbm (lastest and 20101126) on 10.11 drivers with all versions of sdk (crashes)
and 11.3, 11.5, 11.6 with 2.3&2.4 (three devices available)


if there is no solution in next 12h there is 0.5BTC bounty for pointing me to tested and working linux mining guide for linux newbies
7  Other / Obsolete (selling) / IRELAND ONLY! two radeons 6950 for BTC on: May 21, 2011, 10:32:33 PM
have two of those http://goo.gl/CFllj for sale, one brand new in box, second one is mining for a week now

im going for long holidays in 10 days - when i'll be back mining won't be profitable for me anymore, so i may as well sell them now

looking for 45 BTC (through clearcoin) for one delivered within Ireland
8  Bitcoin / Development & Technical Discussion / Portable Bitcoin Client on: May 08, 2011, 06:52:12 PM
most of the people on that forum don't really need that (as they [we] are bit on a geeky side) , but as bitcoin gains more and more popularity it have to have proper backup solution
(average windows user don't even know that there is such file as \Users\user\AppData\Roaming\Bitcoin\wallet.dat or if it is important)

next, before era of bitcoin clents that are actually working on your mobile devices, why not to have your bitcoin client with you on pendrive?
(after all you most likely won't need to send bitcoins unless it is linked to some other activity as online purchase, currency trading, and that mean you will have access to some pc)

so one simple solution - http://portableapps.com

can be copied into another place\medium with all necessary data
can be stored in truecrypt traveller disk container or to keep it simple in password protected zip archive (although that need additional shredder app for deleting wallet  to be safe - still, good for holding some every day wallet with just few btc)

any opinions? (i can't create a pool - either not allowed in this subforum or may be due to fact that i'm still newbie)
9  Bitcoin / Mining / poclbm mining problems with 6950 on: March 19, 2011, 06:15:08 PM
had 5870 and 5970 (both working in another dedicated machine now) and almost all possible driver & stream combinations - everything worked fine

yesterday i swapped 5970 in my desktop with 6950 and problems started

when i have poclbm running (poclbm.exe --verbose --vectors --worksize=128 --frames=120 --host=deepbit.net --port=8332 --user=xxxxx@xxxxx --pass=xxxxx --device=0)

i have 297-335 Mhash/s (depending if it is overclocked and shaders unlocked or not)

but my system freeze instantly (before playback actually starts) when try to play any video in media player classic or flash video in browser

that never happened before with 5870 or 5970, psu is fine and i can put 5970 and 5870 at the same time without problems

6950 seems completely stable (furmark, crysis warhead, futuremark) and i can play videos for hours without any problems (with both oc or default, and same with shaders) and stays below 80 celsius

what i tried so far:
uninstalled and used driver sweper on all ati stuff, tried fresh installations of 10.11, 11.2 and 11.4
it is mining ok, but it stays the same - i have instant (with 10.11 not instant - i can move cursor for few more seconds) freeze - happens only with poclbm running

will try diablo tomorrow, anyone have any other ideas what to check?
10  Bitcoin / Development & Technical Discussion / what happening with lost bitcoins? on: February 08, 2011, 01:22:35 AM
i have some basic understanding of how this system works, but i have one question that i can't find simple answer
(i know that this must be covered somewhere already, but i don't want to get degree in cryptography as someone may by nice enough to explain it in plain english)

imagine you have 100 BTC in your wallet, due to hardware fault your wallet will be destroyed

i found info that no more than 21 millons of BTC will be ever created

is it 21 millions minus all lost btc? i'm guessing that a great number must be lost already, and until now when single BTC is worth almost USD no one really cared too much

or if system is created that way so it keep an average of 21 million BTC all the time, but what are the criteria of regenerating units for replacing lost ones?
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