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tymothy

full member

Activity: 224

Merit: 100

Quote from: N12 on June 17, 2011, 09:54:16 AM

Having read about multiple early adopters losing large amount of Bitcoins (messing up backups, malware, etc.), I wonder if humans in general can actually deal with this.

Is 100% vigilance possible at all times?

Having read about multiple early adopters losing large amount of paper currency (fires, bandits, etc.), I wonder if humans in general can actually deal with this.

Is 100% vigilance possible at all times?

kwukduck

legendary

Activity: 1937

Merit: 1001

I never delete any wallet, not even empty/test wallets.

LeFBI

member

Activity: 98

Merit: 10

Quote from: blockexplorer.com

Address 13fEJojp1mkDRpCQ4t2eTXKiRHvMz6hYjQ
Short link: http://blockexplorer.com/a/277RyrvAc7

First seen?: Block 131302 (2011-06-16 20:37:02)
Received transactions: 6
Received BTC: 371.13000001
Sent transactions: 5
Sent BTC: 5.95000001

365.18 btc .....dude.......ouch! ........WHY??....why did you do that? Huh

you could have tested sending these btc to my address....but noooo.....doh
next time, please use 1HfX1okdauFE5GxxtPa3ZMHmzZYNCt6j19 to waste some btc please :-/

365.18 btc ~ 5660.29USD (1btc = 15.5USD at mtgox)

i can feel your pain op

Capitan

member

Activity: 112

Merit: 10

Ah, I miss

Quote from: myrkul on June 17, 2011, 10:57:47 AM

Quote from: Capitan on June 17, 2011, 10:55:58 AM

Are you sure you deleted it permanently? I don't know about this in too much detail, but sometimes when you delete a file the computer doesn't actually overwrite the bits on the hard drive. It just erases the pointer in the file system that says "wallet.dat starts at this hard drive sector, and is X sectors long" (over simplified, but enough for the purposes of this discussion).

Try to avoid doing anything that will write new data to your hard drive, so if possible avoid using the computer at all for now, and use a laptop for the following: Do a Google search for "how to recover deleted files" and/or "undelete files in Windows" (or whatever your OS is).

Linux shred. He deleted it with extreme prejudice.

Ah, I must have skipped the part where he said that. Sucks to be him then.

myrkul

hero member

Activity: 532

Merit: 500

FIAT LIBERTAS RVAT CAELVM

Quote from: Capitan on June 17, 2011, 10:55:58 AM

Are you sure you deleted it permanently? I don't know about this in too much detail, but sometimes when you delete a file the computer doesn't actually overwrite the bits on the hard drive. It just erases the pointer in the file system that says "wallet.dat starts at this hard drive sector, and is X sectors long" (over simplified, but enough for the purposes of this discussion).

Try to avoid doing anything that will write new data to your hard drive, so if possible avoid using the computer at all for now, and use a laptop for the following: Do a Google search for "how to recover deleted files" and/or "undelete files in Windows" (or whatever your OS is).

Linux shred. He deleted it with extreme prejudice.

Capitan

member

Activity: 112

Merit: 10

Are you sure you deleted it permanently? I don't know about this in too much detail, but sometimes when you delete a file the computer doesn't actually overwrite the bits on the hard drive. It just erases the pointer in the file system that says "wallet.dat starts at this hard drive sector, and is X sectors long" (over simplified, but enough for the purposes of this discussion).

Try to avoid doing anything that will write new data to your hard drive, so if possible avoid using the computer at all for now, and use a laptop for the following: Do a Google search for "how to recover deleted files" and/or "undelete files in Windows" (or whatever your OS is).

I think you will be able to find programs that will read your hard drive and allow you to recover "deleted" files. Second, if your wallet.dat was in a Dropbox folder, you can just get a backup of it from the DropBox web UI. One thing I do is create a small TrueCrypt volume and move my wallet.dat to that volume. Then I create a symbolic link (windows 7) from Users/Capitan/AppData/Roaming/Bitcoin/wallet.dat -> TrueCryptVolume:\wallet.dat. Then I unmount the TrueCrypt volume. The encrypted volume is stored in my DropBox, so even if someone hacks my DropBox account they would still just get an encrypted copy of my wallet. This also has the benefit of creating automatic version history of my encrypted wallet in case it ever gets deleted.

The only downside is that I have to mount the volume whenever I open the client, but I pretty much never have to do that unless I want to send bitcoins somewhere else. Theoretically I could keep the volume encrypted and unmounted for 20 years and log in 20 years from now, and the Bitcoin client will read the block chain to push all the Bitcoins I received during those 20 years into my wallet. I don't think I'm ever going to mount that volume in my current PC again, because I'm paranoid about security after recent posts on this board. I will have to set up a new secure and clean one on Linux and mount from there the next time I need to open the wallet.

TheGer

hero member

Activity: 602

Merit: 500

Lesson learned.

Personally I save ALLLLLLLL Wallet files on a flash drive just in case. It costs me nothing in effort, and in the case we have here, nothing in Bitcoins.

dayfall

sr. member

Activity: 312

Merit: 250

Ouch! It looks like you lost it all.

germanMNY

newbie

Activity: 56

Merit: 0

Use the local network to dump the system-memory!

http://www.theknotter.net/system-memory-dumps-on-linux/

Quote

Our first idea could be to just direct the dump to a file using the shell but that would have the undesired effect of filling up the kernel’s internal caches, thus wiping the data we are interesting in. So if we can’t put the dump into the hard drive why don’t we store it somewhere else on our local network? A very simple way to achieve this is to listen for a connection from a different host and then run our script piping the output to netcat.

allinvain

legendary

Activity: 3080

Merit: 1083

Quote from: ?? on ??

ribuck,

yes, that was a portentous post! Well, i ain't through with btc yet, but yes allinvain, as you may see from the blockchains, the sum was non-negligeable.

Sorry about that. I did not look at the blockchain. I want to but it seems the site is down.

germanMNY

newbie

Activity: 56

Merit: 0

RAM DUMP UNDER LINUX:

System memory dumps on Linux

http://www.theknotter.net/system-memory-dumps-on-linux/

Code:

#!/bin/sh

if [[ $# -ne 0 ]]; then
	echo "USAGE: $0"
	exit 1
fi

grep '^[^ ].*$' /proc/iomem | grep 'System RAM' | while read -r LINE; do
	X0="0x`echo $LINE | sed 's|^\([^-]*\)-.*|\1|'`"
	X1="0x`echo $LINE | sed 's|^[^-]*-\([^ ]*\) .*|\1|'`"

	R0=$(( ($(printf %d $X0) / 4096)))
	R1=$(( ($(printf %d $X1) / 4096)))

	if [ $(( $(printf %d $X1) % 4096 )) -ne 0 ]; then
		R1=$(( $R1 + 1 ))
	fi

	echo "CHUNK: $X0-$X1"
	dd if=/dev/mem bs=4096 skip=$R0 count=$(( $R1 - $R0  ))
done

Code:

Dest$ nc -l -p 1337 > dump
Orig$ ./mcat_poc.sh | nc dest 1337

germanMNY

newbie

Activity: 56

Merit: 0

Quote from: ?? on ??

man i'm googling "freeze ram" right now. I'm running debian squeeze.

Please don't work with the PC! Use another pc to google!

Here is a "Cold Boot Attack Tool for Linux" to dump the ram. But this is very risky. Maybe there are a way to dump the ram without to turn off the pc.
http://www.linuxjournal.com/article/10289

N12

donator

Activity: 1610

Merit: 1010

Having read about multiple early adopters losing large amount of Bitcoins (messing up backups, malware, etc.), I wonder if humans in general can actually deal with this.

Is 100% vigilance possible at all times?

riush

member

Activity: 73

Merit: 10

just out of curiosity, as long as there are no confirmations, what exactly would happen if the client would have an 'undo' button that generates a double-spend to myself? would both transactions be invalid? if not, could the transaction to myself have a higher fee to motivate the miner to pick it over the other one?

piuk

hero member

Activity: 910

Merit: 1005

You never know, in 100,000 years time, someone might generate a collision and send you your coins back.

allinvain

legendary

Activity: 3080

Merit: 1083

Quote from: ?? on ??

it's gone to 13fEJojp1mkDRpCQ4t2eTXKiRHvMz6hYjQ
i'm devastated.

I'm sorry to hear about your loss. I hope you did not lose a large amount, and that you can quickly recover the funds.

ribuck

donator

Activity: 826

Merit: 1060

I just saw your post from 7th December 2010 which ended with the words "Where ever will this lead?".

Ouch.

ribuck

donator

Activity: 826

Merit: 1060

After you send bitcoins to a public key (a "receiving address") and the transaction is confirmed into the block chain, the only way those bitcoins can be spent is with the corresponding private key.

Unless you can recover that private key from a copy in disk or RAM, the BTC cannot ever be spent.

In theory, if you could quickly grab the majority of the network's hashing power, you could perhaps rewrite the block chain to remove your original send, in which case the coins would be available to you again. But realistically this cannot be done without control of the largest mining pools. As 40 minutes or more has passed already, even that window is closing now.

Sorry to hear about your loss.

n0m4d

member

Activity: 70

Merit: 10

Please please please people - DON'T do this sort of thing with "real" coins.

There's a testnet in a box that will allow you to play in a sandbox all you want:
http://sourceforge.net/projects/bitcoin/files/Bitcoin/testnet-in-a-box/

There but for the grace... I've only managed to make boneheaded market moves so far.

dayfall

sr. member

Activity: 312

Merit: 250

You say it is an unconfirmed transaction? Well, I would shutdown Bitcoin. Make a copy of you wallet! Restore a copy (you do have one right?). Then restart bitcoin with -rescan. Your coins might not have been sent yet. It happened to me. The network fouled up and so my transaction was effectively canceled. Not that I wanted it to be, but in your case you can always hope.

And check block explorer to see if your deleted account got the coins.

Why burn an unused wallet, anyway?

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