Is it possible to guess a privkey? | Bitcointalksearch.org

letsplayagame

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Quote from: shorena on November 24, 2015, 09:07:49 AM

Quote from: Hugroll on November 24, 2015, 08:55:58 AM

Quote from: DannyHamilton on November 24, 2015, 08:26:00 AM

Quote from: Sir_lagsalot on November 24, 2015, 07:38:29 AM

Assuming I was lucky enough to mine the exact same address, could I get the privkey?

Yes, if you got the exact same address, then you would have one of the 7.9 X 10²⁸ (on average) working private keys for that address.

wait im not quite sure i understand, are you saying that every bitcoin address has more than 1 private key associated with it? I've always thought it was 1private key that links to 1 address

That is correct. There are 2²⁵⁶ private keys with 2²⁵⁶ public keys. The public key is hashed with ripemd160(sha256(pubkey)). Ripemd160 is limited to 2¹⁶⁰ possible solutions thus[1] there are 2¹⁶⁰ possible addresses with 2²⁵⁶ private keys or 2²⁵⁶/2¹⁶⁰ = 2⁹⁶ private keys per address. 2⁹⁶ ~7.9*10²⁸

[1] under some minor assumptions like even distribution

Basically you have a better chance of winning the lottery AND being hit by lightning than guessing the correct private key for a given address. As pointed about in a prior post, the math can change drastically if a faulty RNG was used.

z0rg1nc

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Quote from: domob on November 24, 2015, 07:53:52 AM

Quote from: Sir_lagsalot on November 24, 2015, 07:38:29 AM

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?

Sir_lagsalot

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Quote from: Syke on November 28, 2015, 10:29:21 PM

Quote from: Jeremycoin on November 28, 2015, 08:08:52 PM

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.

tommorisonwebdesign

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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.

shorena

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No I dont escrow anymore.

Quote from: BurtW on December 03, 2015, 12:04:51 PM

Quote from: Was on December 03, 2015, 06:37:24 AM

Quote from: shorena on December 02, 2015, 06:34:49 AM

Quote from: Was on December 02, 2015, 01:52:26 AM

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 ...

Quote from: DannyHamilton on December 03, 2015, 08:15:40 AM

-snip-
you can read a thread about it here if you like:
https://bitcointalksearch.org/topic/annclam-clams-proof-of-chain-proof-of-working-stake-aka-clamcoin-623147

BurtW

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All paid signature campaigns should be banned.

Quote from: Was on December 03, 2015, 06:37:24 AM

Quote from: shorena on December 02, 2015, 06:34:49 AM

Quote from: Was on December 02, 2015, 01:52:26 AM

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.

fbueller

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

DannyHamilton

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Quote from: Was on December 03, 2015, 06:37:24 AM

- 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://bitcointalksearch.org/topic/annclam-clams-proof-of-chain-proof-of-working-stake-aka-clamcoin-623147

Was

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We are Satoshi.

Quote from: shorena on December 02, 2015, 06:34:49 AM

Quote from: Was on December 02, 2015, 01:52:26 AM

excellent, thank you.

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

clam?

watashi-kokoto

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come to my house

take my pc

copy my key

you guessed it Cheesy

congratulation you stole my funds

chance is 100% when I sleep

when awake i beat you up

watashi-kokoto

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you can create address.

then guess it.

probability is 100% key is same Cheesy

but you're not richer
sad

shorena

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No I dont escrow anymore.

Quote from: Was on December 02, 2015, 01:52:26 AM

excellent, thank you.

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

Was

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We are Satoshi.

excellent, thank you.

fbueller

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Quote from: Was on December 02, 2015, 01:46:02 AM

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

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We are Satoshi.

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

extrabyte

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Quote from: bob123 on November 30, 2015, 05:01:54 PM

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.

bob123

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

calkob

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The sane answer is ....... "NO" Cheesy

Decoded

legendary

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give me your cryptos

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 :-/

Quote from: Remember remember the 5th of November on November 28, 2015, 08:08:58 AM

@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?

vlom

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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 Roll Eyes

Topic: Is it possible to guess a privkey? (Read 3893 times)