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3answers
169 views

Are hacked bitcoins spendable

ok, 700,000 BTC were stolen from MTGox. So are they actually spendable by the hacker or are they now just lost to the world. I can understand wallets being encrypted, but why aren't individual BTC ...
2
votes
1answer
85 views

In what ways could “bitcoin” be hacked?

Dan Kaminsky said that he spent 4 months trying to hack "bitcoin" but failed. Besides trying to find vulnerabilities in double-spending and 51% attack, what other hacks would a hacker try to achieve? ...
1
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0answers
457 views

Cryptsy account got hacked

About 14 hours ago I had about 700 Cat coins and 500000 Doge coins on my Cryptsy account. I have sold 0.02725061 BTC worth of DOGE and withdraw it to another address. Soon after as expected I received ...
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2answers
154 views
0
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1answer
101 views

The bitcoin address space seems to be closer to 2^40, not 2^160

The Base58 Encoding of a public key hash outputs: "A set of 58 alphanumeric symbols consisting of easily distinguished uppercase and lowercase letters (0OIl are not used)" This set is a fixed string ...
0
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1answer
189 views

Several millions of Dogecoins have been stolen. Is a similar hack possible with Bitcoin?

This Christmas several millions of Dogecoins have been stolen from Dogewallet. On Reddit it is explained that the hacker gained access to the filesystem and modified the send/receive page to send to a ...
1
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1answer
182 views

Gaming Bitcoin by generating millions of wallets [duplicate]

What’s to stop someone from gaming the system and creating millions of wallets, increasing their odds of accidental deposits? If nothing else you could conceive of a DOS attack of sorts, where the ...
1
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2answers
79 views

Could there be an exploit by creating millions of meaningless transactions? [duplicate]

Would it be possible to hamper the network's efforts in validating blocks by creating millions and millions of bogus transactions- simply sending back and forth say 0.1 BTC from address A --> B --> C ...
2
votes
1answer
56 views

How are hacks in bitcoin functioning reported so that they can be corrected?

I am wondering if someone discovers a bug/exploit in Bitcoin software or protocol, who should it be disclosed to? Who is the authority? What would happen if the bug went public? Has it occurred in the ...
2
votes
2answers
672 views

Is there anyway I can recover my passphrase? [duplicate]

I have a wallet for the bitcoin qt wallet but I accidentally deleted the only copy of my encryption passphrase... I have read about something called brute force but I'm not entirely sure on how its ...
7
votes
4answers
2k views

Secure way to store BTC over a long time - and its risks?

What are the most secure way to store a huge amount of BTC over a long time and its (detailed) risks? A other assumption is that the owner does not have a very technical background, thus it will not ...
0
votes
1answer
91 views

Sweep transaction issue

I have old (pre-random-number-bug) addresses in my android bitcoin wallet app, with 0 balance. After patch I am using a new address (with balance) and still keeping my old address in my wallet. Should ...
3
votes
2answers
956 views

Why does transaction activity show on the blockchain for my Bitcoin address at my hosted (shared) E-Wallet service?

I have an online wallet at localbitcoins.com (address 12pHFR5yv2KGqck5N8teb5MgoRtzAgLRn2). I made three transfers to it, for a total of 0.5 BTC + 0.5 BTC + 0.3031 BTC = 1.3031 BTC. Blockchain.info ...
7
votes
2answers
3k views

Hacked my blockchain.info wallet, stole 760 coins

Two days ago my wallet at blockchain.info was hacked, everything was taken (760 coins). https://blockchain.info/tx/0619d221a761a3b8ec205773440fa6607d65957ef985dac5fb5273a08bda2c89 Besides the ...
3
votes
1answer
184 views

Compromised Bitcoin clients?

Are there any known cases of compromised Bitcoin clients (whether proprietary or free)? I don’t mean separate malware that attacks installed clients, but malware that is included in the client ...
1
vote
1answer
201 views

Measuring levels of spammer participation on the Bitcoin network

Is there any reliable way of estimating the number of spammer controlled miners? I was thinking about the common wisdom that BitCoin should have been implemented with a hashing mechanism that is ...
5
votes
2answers
1k views

If SHA256 and/or RIPEMD-160 were broken, would all bitcoin addresses be compromised?

If not, what else would be needed to steal all funds from all people and completely break bitcoin? I bet some will say ECSDA gives bitcoin an additional layer of protection. I counter this by saying ...
1
vote
0answers
68 views

How difficult is it to determine the owner of some bitcoins? [duplicate]

When Bitcoin was making the media waves back in 2011, a lot of it focused on the anonymity aspect of bitcoins, the hacks, and the illegal contents of the silk road onion address. From my limited ...
4
votes
1answer
447 views

How much Bitcoin was lost in the Jul. 2011 MyBitcoin site shutdown incident?

https://en.bitcoin.it/wiki/MyBitcoin How much money was lost when it shut down? (You can also edit the wiki page and add this info). Best estimates of course.
4
votes
1answer
376 views

What happened to my coins, hacked?

I'm new to bitcoin, downloaded the bitcoin.org client, encrypted my wallet, and purchase a few bitcoins (5.25), for learning purposes. But now my coins seem to have disappeared to an unknown address. ...
5
votes
2answers
349 views

What does the term “Longest chain” mean?

What does the term "Longest chain" mean, as there is only one 'right' blockchain exists? How another longer chain would make the 'right' chain invalid?
-1
votes
1answer
179 views

What's the story behind the Mitt Romney's tax return information blackmail

On the 6th of September, 2012 CNN reported that a hacker group got a hold of Mitt Romney's tax return information and demanded a ransom of 1 million dollars equivalent in bitcoins to be paid for not ...
2
votes
1answer
558 views

What user data has been leaked from MtGox's database during June 2011 hack?

What user data has been leaked from MtGox's database during the June 2011 hack? Is the database still available for download anywhere, like it was almost a year ago?
7
votes
1answer
274 views

What could be the impact of the distribution of “tainted” Bitcoinica coins?

The hacker was distributing them in IRC recently, and sent some to the Bitcoin Faucet. Is this a reliable method for evading the "Bitcoin Police"? Here's a forum thread discussing the distribution ...
2
votes
1answer
407 views

What is the story behind MyBitcoin?

The name of MyBitcoin eWallet comes up quite often here and there. What is the story behind it and the attack on it they claimed occurred?