solve key 66 67 Puzzle how to avoid double spends the tx? - page 2.

seoincorporation

legendary

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Quote from: a8832021 on April 15, 2024, 08:27:52 AM

If the pubkey is revealed,may someone use BSGS algorithm to crack the privkey and double spend the coins? Huh

The public key is already known information, but that is not enough to crack the private key, and if someone get's access to the private key first they need to spend the coins before be able to double spend it. But looks like you are lost in the topic, what op means is.

Let's say someone finds the private key from puzzles 66 and 67, if they spend the coins and make public the private key, som users could use that private key to make a double spend from the same coins and if they use bigger fees then they could steal those coins. But the way to avoid that is to not make public the private key until it has more than 1 confirmation.

a8832021

newbie

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If the pubkey is revealed,may someone use BSGS algorithm to crack the privkey and double spend the coins? Huh

vjudeu

copper member

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Quote from: vjudeu on October 26, 2023, 05:25:47 AM

4. Provably fair transaction puzzles:
Input script: " "
Output script: " OP_SWAP OP_CAT OP_CHECKSIG"
Execution:

Code:

OP_SWAP
OP_CAT
OP_CHECKSIG
OP_TRUE

Then, if you pick for example 0xbadc0ded as your , then people could mine a public key, starting with x-value equal to 0xbadc0ded, and that would be a proof, that someone can break 32-bit public keys. Of course, any non-zero pattern will do (the only reason why zero will not work, is the half of the generator).

Which means, that if you want to do the same thing with OP_HASH160, then after a small modification, it should also work, when OP_CAT would be activated:

Input script: " "
Output script: " OP_SWAP OP_CAT OP_OVER OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG"
Execution:

Code:

OP_SWAP
OP_CAT
OP_OVER
OP_HASH160
OP_EQUALVERIFY
OP_CHECKSIG
OP_TRUE

As many people already noticed, a lot of problems could be solved, if we only would have OP_CAT. But I still wonder, if it would be activated or not.

DaCryptoRaccoon

hero member

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OGRaccoon

Seems kind of pointless puzzle if when you do find a solution someone else can just rob the coins off you by spam attacking and kangaroo attack.

So really the whole point of the "weak" keys puzzle is flawed as many people will just be waiting for the TX to hit the network then just go after that.

In essence unless your conneced to some mining pool or have connections there is zero chance your going to get a pool to include this actually you may find they try steal it from you.

And yes there are people running this stuff on crazy crazy machines so there is a good chance once broadcast before it gets picked up someone else then it's fee race and yea before in the past this happened someone ended up paying a massive fee just to get what little coins they could.

So don't participate unless your well linked up and know exactly how to do this stuff or you will get mugged for your find on broadcast.

HeRetiK

legendary

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Merit: 2178

Playgram - The Telegram Casino

I don't really follow the Bitcoin Puzzle scene, but assuming the public keys for these particular puzzles are indeed within a range that could be derived within seconds, digaran already answered the question following the post you were linking:

Quote from: digaran on January 08, 2024, 05:05:15 PM

you'd need to either have a bot that automatically double spends the tx or talk with a large mining pool to privately include your tx in a block

Though even that will not guarantee success if your adversary is able to broadcast their transaction at the roughly the same time (i.e. within seconds) as you: (1) They may attempt multiple double spends so now it just becomes a competition of who spams the network most effectively and (2) the mining pool you are colluding with may not be the one actually find the next block. Nonetheless following either approach would increase your chances over just hitting send and hoping for the best (though as mentioned above I can not asses the risk of getting looted for those particular puzzles).

Airfin Same

newbie

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Merit: 1

Quote from: un_rank on April 12, 2024, 12:45:33 AM

Your question is not clear enough for me to give an answer. Where are you importing your private keys from and where (which address) are you sending to?

If you are asking if you are protected from double spending, Yes you are if you wait for 1 confirmation for lower amounts and 3 confirmations for very large amounts of bitcoin.

- Jay -

https://bitcointalksearch.org/topic/btc-puzzle-6667-and-68-solo-pool-5454194

assuming someone found the private key
by using kangaroo the algorithme here https://bitcointalksearch.org/topic/pollards-kangaroo-ecdlp-solver-5244940 anyone can get the private key with the public key
public key will be known to everyone the second your transaction is shown

how to prevent looters from double spend this transaction? the amount is 6.6btc or 6.7btc or 6.8btc depend on the puzzle number 66,67,68

Quote from: Charles-Tim on April 12, 2024, 02:41:26 AM

Quote from: Airfin Same on April 11, 2024, 08:48:38 PM

importing private key to electrum wallet then send to your address is it enough?

You import the private key and then send the coins to another address. Why not just sweep the private key instead. But if you just prefer to import and send the coin to another of your address, that is not also bad as long as the private key that you imported is not compromised and your if the wallet that you sent the coin to also is not compromised.

the private key will be compromise in seconds (1s) as i mention above with kangaroo or a similar algorithme

link to ann of the puzzle
https://bitcointalksearch.org/topic/m.63933672

here someone talk about double spend
https://bitcointalksearch.org/topic/m.63465321

Charles-Tim

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Quote from: Airfin Same on April 11, 2024, 08:48:38 PM

importing private key to electrum wallet then send to your address is it enough?

You import the private key and then send the coins to another address. Why not just sweep the private key instead. But if you just prefer to import and send the coin to another of your address, that is not also bad as long as the private key that you imported is not compromised and your if the wallet that you sent the coin to also is not compromised.

un_rank

hero member

Activity: 644

Merit: 661

- Jay -

Your question is not clear enough for me to give an answer. Where are you importing your private keys from and where (which address) are you sending to?

If you are asking if you are protected from double spending, Yes you are if you wait for 1 confirmation for lower amounts and 3 confirmations for very large amounts of bitcoin.

- Jay -

Airfin Same

newbie

Activity: 17

Merit: 1

importing private key to electrum wallet then send to your address is it enough? or some bots can double spend tx

someone pls advise how to avoid such attack i read that the second of the public key of key 66 67 is revealed looters can double spend tx and steal those coins

suppose someone lucky find the private key of the puzzle what he should do what wallet is more secure to use to send those coin

Topic: solve key 66 67 Puzzle how to avoid double spends the tx? - page 2. (Read 803 times)