Linked Questions

17
votes
3answers
4k views

Is this “transaction malleability” really an issue?

The well-known Bitcoin exchange Mt.Gox last week suspended all Bitcoin withdrawals because of "technical issues", which today have been better described in this press release. This looks like a ...
2
votes
2answers
994 views

can man in the middle change transaction before its broadcast?

i'm very new to bitcoins (started learning it today). i hope i get the question right: i understand when a transaction is created, using my private key i sign the transaction, but i also provide the ...
2
votes
1answer
1k views

How can bitcoins be stolen?

I read about Mt. Gox and how 850,000 bitcoins has been "stolen" from it. I do not understand how someone can steal bitcoins: if MtGox has bitcoins, and MrThief wants to use this bitcoins, then MrThief ...
3
votes
2answers
191 views

is transaction malleability a threat to my local wallet?

I have a local Bitcoin-QT wallet. Can transaction malleability be used to steal my horde of tens of thousands of Satoshis?
1
vote
1answer
836 views

What can be the reason to change transaction ID?

I always thought that when my wallet create a transaction, it's transaction id is fixed (it is the SHA256 of the transaction message). Yes, the transaction might not be included in the next block (and ...
1
vote
2answers
104 views

Do miners become temporary dictators of blocks they mined?

This is something I've read here: https://blockgeeks.com/guides/bitcoin-forks-guide/ "When a group of miners discovers and mine a new block, they become temporary dictators of that block" Can anyone ...
3
votes
1answer
327 views

How are transaction IDs generated and how are they then changed by transaction malleability?

How are the transaction IDs generated for a Bitcoin transaction? How can the transaction ID change due to a transaction malleability attack?
6
votes
2answers
220 views

How did transaction malleability/DDOS attacks allow an exchange's internal accounting system to get “out of sync”?

This Coindesk article says that: “So as transactions are being created, malformed/parallel transactions are also being created so as to create a fog of confusion over the entire network, which ...
2
votes
2answers
43 views

Why are the fee value and modified fee value always the same?

I do not see any transaction in the mempool having differing values for the fee and modified fee fields. Does nobody modify or accelerate their transactions? How do transactions with modified fees ...
0
votes
1answer
44 views

How malleability ussue works?

Can you explain malleability issue, please? This is what I read here: https://qz.com/175565/why-nobody-can-withdraw-bitcoins-from-one-of-the-currencys-largest-exchanges/ "When a transaction record ...