Topic: Competition to settle a bet and win 0.1btc (Read 215 times)

Just show him this video: How secure is 256 bit security?

However, this isn't the real security of a bitcoin address. A bitcoin address is an encoding of a 160-bit number (plus some extra things), which is calculated by hashing a 256-bit one. Therefore, a collision would only require about 2¹⁵⁹ searches. But, to be even more pedantic, you don't have to find a RIPEMD-160 collision to steal bitcoins you don't own (without threatening anyone!). The early bitcoin blocks have been paid in public key, meaning that if can you can solve the discrete logarithm problem, you could find those public keys' private keys.

Given that the known algorithms that can solve ECDLP (BSGS, Pollard's rho etc.) require O(sqrt(n)) steps where n the order of G in secp256k1 (n~=2^256), the security of a public key is about 128 bits.

So, instead, give him this public key:

Whose owner possesses :

It's 2^128 times easier and the prize is over a million times greater than 0.1 BTC.  (If we assume it's a prize  )

Why the detour? Just show the address holding 0.1 Bitcoin, and ask someone to find it's private key.
Let me help you: these are the first 100 out of 100,807 addresses holding 0.1BTC:

While you're at it, it may be more rewarding to try to brute-force the Bitcoin Rich List. Good luck

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As for your bet:
Let him prove it It gives him the chance to convince himself how secure Bitcoin is.

It's not a large sum. The Bitcoin Rich List proves that 100,000 BTC isn't enough to brute-force it either.

Am i on the right track?
EDIt: Dang i thought you were creating a bet and hiding the private keys in the btc addresses. NO it cant be done. Unless someone has posted it online  and it has been indexed. If you can extract private keys buy just having the public key then its game over for bitcoin

This isn't possible, that is correct. If it were, it would mean that there's a risk of the money in one's wallet, and it would defeat the whole point of the security that cryptography provides. It's not impossible in principle, though, right? It's just that the current technologies don't have enough computing power to make the calculations in any reasonable amount of time. But that's why some are afraid of quantum computers, and there were tons of discussions on how that can be the end of cryptos. Still, though, it has to be a major breakthrough in quantum computer to make that big of a difference that private keys can be figured out. And it's not clear if it's a matter of time or if it's going to ever happen (kind of like with people travelling to other planets).

Search for yourself on this site
https://keys.lol/
Maybe you will find other wallets that have a balance. Although it is impossible to do this, the traffic statistics of this site are surprising
https://keys.lol/statistics

This is an impossible mission and no one can ever get you the private keys unless the person owns the address, there has been a lot of effort in the past to break the Bitcoin blockchain security code to steal information from the source code but it has always met with a steel end,  if you see anyone having to access the private key or access public wallet address it must be an insider game so hackers most time don't walk alone there must be an insider's.

If your friend thinks so (and he's not the only one), then you need to give him the challenge to have fun for the rest of his life. From time to time you can ask him if he has found something, and maybe after a while, he will realize how wrong he is


Source

You don't have to provide any addresses yourself. Everything you need can be obtained from block explorers or by checking all addresses ever used here, or those that have/had balances here. 
If it was possible to obtain private keys that way, Bitcoin wouldn't make any sense. There isn't even a danger for addresses whose public keys are known, despite the occasional worry that supercomputers might one day be powerful enough to obtain a private key from a public key.

Yes, I completely agree, hence me putting up such a large sum as incentive.

The only way I think it may be possible is if, by sheer luck, one of these addresses have already been key paired on a database somewhere. But odds are almost nil.

Some people have a hard time imagining how big the search space is. It is clear here from using "trillions upon trillions" too. To put simply you are thinking in terms of a grain of sand compared to all the sand in the world.
Here is a trillion compared to 2²⁵⁶ which is about the number of private keys there are. It helps you visualize how ridiculous it is even if you search "trillions upon trillions" of keys!

P.S. The only way anybody would ever find a key by searching is if the key creation was flawed like the broken blockchain.info wallets back in the day that used the same entropy (bugged random.org) to create the same key for everyone or the puzzles where the search space is intentionally decreased to a much smaller one.

There's already proof this isn't possible. There were "mining" groups trying to use databases of known addresses and generate private keys for them to try to break them (it was mainly discussed and attempted a few years back).

I did hear rumours of claims from the group involved they succeeded with a few addresses but it's not really been well backed and it could've just been someone internally claiming it when they prefunded the address that they then claimed to have bruteforced. I do t think there's been anyone complaining their funds have been taken this way either.

Hey all,

This is a genuine competition.

My friend and I have a bet.

He says that because Bitcoin has been around so long now, it should be possible to crowd source a private key for almost any specific public address as he reckons there will now be databases out there with trillions upon trillions of matched key pairs. I say this is rubbish and it cannot be done.

So, here are 100 addresses. They are all zero balance, sorry.

If anyone can provide a correct private key for any of these addresses, I will give you 0.1 btc.

I don't think it can be done and I'm putting my money where my mouth is.

Prove me wrong haha!

If you do, then you can just post the private key in here for me to check.

Good luck!



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