Malleability, stress-tests and other Bitcoin problems. AMA

AlisterMaclin · 17分前

Thanks! (As you demonstrated, leaving the bug unfixed is harmful to many clients and services too... But I suppose that it is easier to excuse harmful inaction than harmful action...)

doctorwhony · 32分前

Right now you have to trust the 5 largest miners, who together have more than 70% of the hash rate. And the top 4 Chinese pools have shown that they can get together and agree on common policies...

You also have to trust various software developers. And trust that any news about security risks will not be censored by your forum's admins. And trust that the big holders will not decide to dump all their holdings before your get to sell yours.

AlisterMaclin · 44分前

Malleability has been a widely known problem since the MtGOX collapse 20 months ago. Can you guess why the developers failed to fix it in all that time?

AlisterMaclin · 56分前

Are there other malleable details in the transactions besides the one you are exploiting (sign of r and/or k, is that correct), or is that the only remaining one?

giziti · 9時間前

I seem to remember that there was in some Gospel something about a needle through the eye of a camel, or something like that. Or was that a Buñuel movie?

It does not seem to be a very popular passage, though; I haven't seen it mentioned in many years...

Onceasmoker · 12時間前

Suppose you somehow control a largish amount of money (or a humongous amount, like Bill Gates). Someone like Steve Zilber (or Wences Casares) approaches you and demands that you should really invest some of that money, or some of your time, to support some silly enterprise that he is obviously fanatic about, but you know that is bullshit. How should you answer:

(a) "No thanks, but I don't think that it is interesting."

(b) "Oh, thank you, I will definiely look into it and call you back."

Before choosing the answer, consider how the person is likely to react in each case...

MineForeman · 12時間前

Is it possible that Theymos and his gang don't see how harmful their censorship is for bitcoin?

In that infamous leaked chat log, Theymos brags of having successfully steered the opinion of some other community by censoring their forum. I wonder what community was that. Censorship may work with the kind of readers that are now left in that /r/bitcoin; but the players who matter -- developers, CEOs, serious investors -- should be put off by it. How could an investor take bitcoin seriously, if he learns that it must be "protected" by censorship?

How could anyone trust the core developers, when they are seen condoning (if not promoting) forum censorship?

MineForeman · 18時間前

You should be more explicit: "Any opinion that is negative towards ~~Paycoin~~ Blockstream or their products, plans, actions, or staff, or any fact or argument that might lead other readers to acquire such opinions on their own, will be grounds for immediate and permanent ban."

davout-bc · 19時間前

VCs will start buying BTC companies for the sole intention of transitioning them to fiat-based

Or they will do it themselves -- like Circle is doing already.

jstolfi · 20時間前

Thanks. I knew about the stock exchange, but isn't there a bitcoin "fund" (or more than one) among those stocks?

Ditto for Havelock: do they trade some "funds" too?

giziti · 20時間前

Oh, sorry for the misunderstanding. Didn't you say that you did some missionary work, at least?

giziti · 22時間前

BitChick posts occasionally to the Wall Observer thread on bitcointalk. According to what she herself told there, she and her husband are priests of some Christian denomination.

Delusionalbull · 1日前

A couple of months ago a vulture literally exploded when it landed on a high voltage feed, one paw on each wire, a block from my office on campus. The electrician who came to replace the blown fuses told me that "oh, we see that sometimes happen to our wire thieves".

davout-bc · 1日前

Some autoimmune degenerative disease, as the developers turn against themselves. Or maybe general organ failure due to obesity and cholesterol buildup in the protocol. Block rupture cannot be excluded either.

Or maybe from swallowing a hard fork, having mistaken it for a soft one.

sciencehatesyou · 1日前

As long as Blockstream "owns" the protocol and the default implementation, they can put in them any "improvement" that their products need (like CLTV, RBF, CPFP, two-way sidechain pegs) and block any changes that goes against their plans, or that is good for their competitors (like raising the size liimit).

Presumably they made sure that their would-be investors were aware of that unique advantage. And that explains why the defection of Gavin to BitcoinXT sent them into panic mode. Capisce?

BraydenH · 1日前

You should run a full butt node. It will dump a really big and always growing file on your phone that you will have to keep forever.

rdnkjdi · 1日前

I believe that, for this attack, he does not need to spend any BTC of his own, not even for fees. He just re-issues other people's transactions after "malleating" them.

rdnkjdi · 1日前

Is that the same Swarm that recently ran the failed election to the Bitcoin Foundation board? That had an overwhelming few hundred voters in all? That had to be cancelled and redone by another company?

jstolfi · 2日前

You mean, after three days still be unable to spend the $99?

theirmoss · 2日前

It is like auditing a company by analyzing only the list of input and output dollar amounts, without being told what each amount was for, and with no way to independently check anything.

Onceasmoker · 2日前

But the owner of snapshillbot happens to be a robot himself, I am sure.

GreatGuy_GG · 2日前

That's OK, I just checked with the head of our Troll Training program. It is just an exercise that they do every quarter, to teach the new recruits about the importance of being subtle.

jstolfi

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