Is it possible to guess a privkey?

[Syke]

Yes it is, it just like crackin' a password. But it will take a long long long time to do it, because private key has so many characters in it.

The short answer is, "The earth will no longer exist by the time you guess a private key."

Here's the long answer.

[vlom]

i once asked the same question.
one answer is missing here:
nothing easier than that. this has already be done. have a look at: http://directory.io

edit: read carefully 

[Decoded]

Yes, it is possible but a bitcoin address of just so long it souls take you a few trillion trillion trillion years, if I remember correctly. O don't think humans have even existed for that long.... Maybe we'll be able to goes a private key when Quantum computers come out though :-/

@DannyHamilton

I am astonished by the number of times you have replied to these kinds of threads. Anyone else would've lost their mind.

Sorry if this is a little off topic, but how do you change your name?

[calkob]

The sane answer is ....... "NO" 

[bob123]

Theoratically yes.. its possible..
.. but its not worth the time trying.. you probably wouldn't guess the right private key in your entire life.

[extrabyte]

Theoratically yes.. its possible..
.. but its not worth the time trying.. you probably wouldn't guess the right private key in your entire life.

In theoretically it should be but practically it is not possible not for now but even for a decade from now.

[Was]

Quick Spin on the question to anyone who feels obliged to answer,

If I created an Altcoin, and used the same algorithm (secpk256, i think) to generate the pub/priv key pairs, if I sent coins to an existing address on the bitcoin network, for example,one of Satoshi's, would the private key be the same for that address on the altcoin blockchain? i.e. would satoshi be able to spend these coins assuming he was aware of this?

thank in advance

Was

[fbueller]

Quick Spin on the question to anyone who feels obliged to answer,

If I created an Altcoin, and used the same algorithm (secpk256, i think) to generate the pub/priv key pairs, if I sent coins to an existing address on the bitcoin network, for example,one of Satoshi's, would the private key be the same for that address on the altcoin blockchain? i.e. would satoshi be able to spend these coins assuming he was aware of this?

thank in advance

Was

Yep!

[Was]

excellent, thank you.

[shorena]

excellent, thank you.

CLAM distribut(s|ed) its coins that way.

[watashi-kokoto]

you can create address.


then guess it.


probability is 100% key is same

but you're not richer
sad

[watashi-kokoto]

come to my house

take my pc

copy my key

you guessed it

congratulation you stole my funds

chance is 100% when I sleep

when awake i beat you up

[Was]

excellent, thank you.

CLAM distribut(s|ed) its coins that way.

clam?

[DannyHamilton]

- snip -
clam?

It's an "altcoin".  As a rule I generally avoid all altcoins, so I don't know a lot about it, but you can read a thread about it here if you like:
https://bitcointalk.org/index.php?topic=623147.0

[fbueller]

It is possible. Just don't waste your time.

[BurtW]

excellent, thank you.

CLAM distribut(s|ed) its coins that way.

clam?

The initial distribution of CLAMs is interesting. Basically, if you owned Bitcoins at a certain point in time then you own the corresponding CLAMs, all you have to do is claim them.

[shorena]

excellent, thank you.

CLAM distribut(s|ed) its coins that way.

clam?

The initial distribution of CLAMs is interesting. Basically, if you owned Bitcoins at a certain point in time then you own the corresponding CLAMs, all you have to do is claim them.

Sorry, I did not want to derail the thread with this. They also did(?) this for litecoin and dogecoin. I say did with a questionmark because there recently was a big discussion whether the dev should fork CLAM to change this behaviour. I did not follow the coin for a while though, so ...

-snip-
you can read a thread about it here if you like:
https://bitcointalk.org/index.php?topic=623147.0

[tommorisonwebdesign]

Don't worry, as stated before, private keys are strongly encrypted and would take quite some time even for supercomputers to decrypt. Don't worry, your coins are safe.

[Sir_lagsalot]

Yes it is, it just like crackin' a password. But it will take a long long long time to do it, because private key has so many characters in it.

The short answer is, "The earth will no longer exist by the time you guess a private key."

Here's the long answer.

Wow, now that I think about it, that makes an awful lot of sense. But hashing is a lot more random, on average it will be impossible, but even a lemon could guess a privkey first try.

[z0rg1nc]

I've used vanity miner before, and I've tried guessing an existing address, but according do vanitygen, it takes more than a billion years on average to solve. Assuming I was lucky enough to mine the exact same address, could I get the privkey?

Yes, in theory.  Note however that you provided the actual answer yourself:  The chance is so vanishingly small that it is, for all practical purposes, simply impossible.

If there isn't some RNG collision... I had experience with one same address in btc core and on blockchain.info Probably got so lucky=) No import\export of course. Generated with period 1 month+. This year. When developing exchange of BitMoney. No proofs but it happened.

So...

P.S. Oh i see there was some bug on blockchain.info, but how it could coicide with btc core?