Questions tagged [hacking]

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Bitcoin Core stores public keys and balance unencrypted, a few questions

I came across this statement in the Sparrow Wallet documentation; Unfortunately, Bitcoin Core stores your public keys and balance unencrypted on the computer it is running on. If this computer is ...
FractalEncrypt's user avatar
0 votes
1 answer
149 views

Trezor - Can a hacker rebuild my wallet with my RECOVERY SEED without my Trezor PASSPHRASE?

I know a hacker could rebuild my wallet on another trezor or compatible hot wallet with my recovery seedphrase. This would get them to the ROOT of my original account. But what if I had a PASSPHRASE ...
Alot Anor's user avatar
0 votes
0 answers
22 views

I don't understand why Wallet keys are only a little over a kilobyte when the transaction signatures are extreme in size [duplicate]

I'm asking this question related to bitcoin security. There's a general consensus that it's nearly impossible for a %51 attack on the bitcoin blockchain which isn't generally considered a risk that ...
podlook's user avatar
-1 votes
2 answers
92 views

Is the 'real barrier' to attack bitcoin's consensus 33.34%, rather than 51%?

Saw a random tweet thread that claimed that the "51" in "51% attack" was misinformation, and that in reality only 33.34% of hash power would be needed for a bad actor to attack the ...
Runeaway3's user avatar
  • 329
1 vote
2 answers
603 views

How (un)safe is it to use non-random seed words?

Suppose someone chooses to use a seed (mnemonic) that is easy to memorise, like true kid true kid true kid true kid true kid true kid - using a passphrase, of course. The benefit is clear: he'd only ...
room101's user avatar
  • 11
2 votes
1 answer
117 views

Can a signed raw transaction's locktime be changed?

If I create a signed raw transaction with a locktime in the future, and give this raw transaction to somebody else, can they edit the locktime so that they recieve the bitcoin immediately? For example,...
Cannabijoy's user avatar
1 vote
1 answer
89 views

Addresses to do with illegal transactions

I have been searching for sources to obtain illegal addresses used in high profile incidents such as the Mt. Gox hack, Stone Man Hack etc. It would be helpful if someone has this on hand.
Rohan Maheshwari's user avatar
0 votes
0 answers
247 views

Is there software that can scan for reused R-values?

Is there any up-to-date program that can check for reused R-value for a specific Bitcoin address? (I don't want to scan the whole blockchain, just for a particular address.)
Riaan Groenewald's user avatar
1 vote
4 answers
116 views

If the nodes are what keep Bitcoin decentralized, what if some big internet company spun up 60%+ majority nodes?

If the nodes are what keep Bitcoin decentralized, what if some big internet company spun up 60%+ majority nodes? What’s stopping them from manipulating the blockchain to change transactions?
Trevor Wood's user avatar
3 votes
1 answer
105 views

Specifying delivery addresses on channel closes - includes force closes?

In https://github.com/lnbook/lnbook/blob/develop/07_payment_channels.asciidoc We see this block of text: Typically the addresses used in this cooperative close transaction are generated freshly for ...
Michael Tidwell's user avatar
0 votes
1 answer
311 views

Security of online Electrum wallet after deleting wallet file

I just created an Electrum wallet using my computer which is connected to the Internet. Suppose I send my bitcoin from an online exchange to that wallet, then delete the wallet file. Are there any ...
Betterthan Kwora's user avatar
2 votes
2 answers
136 views

How Crypto Payment Processors Handle Wallet Balance Privacy?

If an online store accepts crypto payments directly into its wallet there is a problem: "Anyone can make a small transfer to any BTC address derived from the MPK so they can watch the store's and its ...
ManjaroDan's user avatar
1 vote
1 answer
3k views

How to transfer BTC balance when I have Private Key? [duplicate]

I have BTC public address and privatekey with balance. Can I Transfer the balance for another address?
Kumarasiri Silva's user avatar
0 votes
1 answer
1k views

How can someone get my private data (such as email, name, IP ...) from bitcoin transaction?

I am curious about privacy of bitcoin transactions. I heard that if you are good enough at hacking, you can get private data from bitcoin transaction, or associate someone to transaction. How is it ...
Nika Kurashvili's user avatar
17 votes
3 answers
9k views

How do you derive the private key from two signatures that share the same k value?

I wrote my own ECDSA signature algorithm just for the purpose of creating unit tests. With it I created two signatures which went into transaction 56ec7ca7df..., sending from 1GXFXm3es.... These ...
Thorkil Værge's user avatar
3 votes
1 answer
122 views

What's relationship to each address other in Bitcoin Core?

I just made two and more address in Bitcoin Core wallet. Is there any relationship to each address? Like based on seedphase? or Just literally making 'random' address? If so, an attacker can hack ...
bitcoinlearner's user avatar
0 votes
1 answer
262 views

btc transaction show all btc moved from wallet [duplicate]

I transfered a small amount of btc from my private wallet with bitcoin core client. When I check blockchain.info I see the transaction with the amount of btc i transferred going to the correct address....
Frank's user avatar
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1 vote
1 answer
244 views

What happens if a network “splits”

I’m a developer but a total noob about bitcoin and Blockchain so i’ll, for sure, say something wrong. I know that bitcoin approve transactions via nodes (normal and full nodes) and that they are ...
LombaX's user avatar
  • 111
2 votes
1 answer
324 views

Can malicious peer hack freshly installed bitcoin-core node

I'm considering two scenarios of hacking freshly installed bitcoin core node. Does freshly installed bitcoin-core node have genesis block included in the installation? This fresh node contacts some ...
croraf's user avatar
  • 1,238
0 votes
1 answer
279 views

Am I being hacked, can I prevent it?

I have just sent bitcoins from one account of mine to another, and after I sent it I checked on blockchain.info to get updated about confirmation. There, I noticed something peculiar, it said that I ...
Adam Shem-Tov's user avatar
0 votes
3 answers
547 views

Pictures and non-transaction data in block chain

It is well known that non transaction related information has found its way into the block chain. This raises multiple questions: (1) How was it done, and is it still possible (2) If someone where to ...
redcode's user avatar
0 votes
0 answers
58 views

At what market cap will bitcoin be worth "cracking"?

This is the doomsday scenario: bitcoin's market cap goes into the trillions of dollars and the cost/benefit ratio of cracking the encryption algorithm tips so that it becomes attractive to throw ...
Tom Russell's user avatar
1 vote
1 answer
384 views

Can hackers behind the ransomware WannaCry be traced through bitcoin transactions?

Can hackers behind the ransomware WannaCry be traced through bitcoin transactions? Is there is central server of Bitcoin where all transactions can be looked up from? And is it possible to identify ...
Johnson Zhou's user avatar
13 votes
3 answers
1k views

What's stopping someone from taking over all the bitcoin addresses?

Anyone can generate unlimited bitcoin addresses. Presumably, there's a limited number of these (even if it's a very very large number). What's stopping someone from taking over all the bitcoin ...
thanks_in_advance's user avatar
3 votes
1 answer
389 views

What was the timeline of the Bitcoin Unlimited Hack as of 2017-March and where was it in the code?

I've been trying to follow the Bitcoin Unlimited hack timeline (2017-Mar) and there seems to be conflicting stories on both sides. It's obviously to confuse the 3rd party into finding the truth. My ...
Patoshi パトシ's user avatar
0 votes
2 answers
2k views

How to tell if I have been hacked?

Lately, I had a synchronization problem using bitcoin core, and I asked in this forum how to solve it. Here is the link of the forum post. I resigned trying to make bitcoin core work again, and ...
positive.citizen's user avatar
5 votes
2 answers
2k views

Can a clever hacker still steal everyone's money from the blockchain.info wallet?

Blockchain.info claims: We cannot (and don't want to): View your balance View your address book Make transactions on your behalf Confiscate your wallet Lock you into our service. ...
Claudiu's user avatar
  • 447
5 votes
4 answers
701 views

I just lost 1.36275883 ($313), and I don't know how it happened or how to prevent it again

I just opened my multi bit wallet, and the 1.36275883 that was in there is now gone. It loaded a brand new wallet, so I don't even have my old wallet with the old transactions or password. I know ...
guest's user avatar
  • 59
0 votes
2 answers
1k views

How to recover from a double spending attack?

I found myself incapable of answering what would happen in this case, so here it is: A hacker (Mr Hacker) spends UTXO_1 and UTXO_2 in TX_1, depositing the monetary value of all TX_1's outputs into a ...
Doug Peters's user avatar
  • 1,366
8 votes
1 answer
3k views

When to worry about 1-confirmation payments

A customer sends me a payment for some digital good at my service, where delayed delivery is a deal-breaker, so I only wait for 1 confirmation by the network before releasing the links for the ...
Doug Peters's user avatar
  • 1,366
1 vote
1 answer
195 views

Tracing solo miners and anonymity

Can one, theoretically, write a program that is similar to a solo miner but instead it just logs IPs of other computers on the bitcoin net to trace IPs that might have bitcoin wallets on them and then ...
thedrs's user avatar
  • 319
4 votes
1 answer
2k views

How do Blockchain.info recovery mnemonics encrypt wallet data and what prevents hacking of the algorithm?

How do mnemonics encrypt wallet data and what prevents hacking of the algorithm? For example Blockchain seems to encrypt all data using a mnemonic yet doesn't hold customer data server side. What ...
Wizard Of Ozzie's user avatar
3 votes
3 answers
843 views

Are hacked bitcoins spendable?

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 ...
michaelbinary's user avatar
2 votes
1 answer
234 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? ...
Pacerier's user avatar
  • 2,105
1 vote
2 answers
1k 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 ...
User2344452's user avatar
0 votes
2 answers
1k views

Why does my wallet say that I have 0.00BTC and 8.91 unconfirmed, when I had done nothing with them?

Here is my BTC wallet page. Is it normal that I have 0.00 ?
clementgamache's user avatar
2 votes
1 answer
444 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 ...
Robert Christian's user avatar
0 votes
1 answer
279 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 ...
Saaru Lindestøkke's user avatar
2 votes
1 answer
355 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 ...
Robert Christian's user avatar
1 vote
2 answers
151 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 -...
user10405's user avatar
2 votes
2 answers
1k 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 ...
Jairo's user avatar
  • 21
8 votes
4 answers
4k 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 ...
user599464's user avatar
0 votes
1 answer
156 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 ...
vi.su.'s user avatar
  • 1,852
3 votes
2 answers
4k 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 ...
Pacerier's user avatar
  • 2,105
7 votes
3 answers
7k 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 ...
Bastiaan Quast's user avatar
3 votes
1 answer
208 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 itself....
unor's user avatar
  • 316
0 votes
1 answer
232 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 ...
Indolering's user avatar
8 votes
2 answers
3k 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 ...
John Smith's user avatar
1 vote
0 answers
96 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 ...
CQM's user avatar
  • 1,590
7 votes
1 answer
719 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.
ripper234's user avatar
  • 26.6k