How to do Double spend

[ariellee]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

[dkbit98]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

Why would you want to so double spend?
Not sure it will work anyway, depending on mempool and other things,
but it is 2 exact same transactions sfrom same wallet sent to some other wallet.

Again, DO NOT experiment with double spend!

[ariellee]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

Why would you want to so double spend?
Not sure it will work anyway, depending on mempool and other things,
but it is 2 exact same transactions sent from same wallet sent to some other wallet.

Again, DO NOT experiment with double spend!

Hi please don’t worry for me I just want to know how to do it. And also what do you mean by sending the same transaction twice ?
I want to know how to send bitcoin and make it back to my wallet. I think it’s still possible because somebody that I know did it but he does not want to show it to me that’s why I’m coming here to ask it to you.
Please help me

[figmentofmyass]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

why, so you can fool someone into accepting a zero-confirmation transaction, only to send the funds back to yourself?

anyway, the easiest way is to use something like double-spend.py---see here: https://bitcoin.stackexchange.com/a/32347

Basic usage:

./double-spend.py <address> <amount>

Creates two transactions in succession. The first pays the specified amount to the specified address. The second double-spends that transaction with a transaction with higher fees, paying only the change address. In addition you can optionally specify that the first transaction additional OP-RETURN, multisig, and "blacklisted" address outputs. Some miners won't accept transactions with these output types; those miners will accept the second double-spend transaction, helping you achieve a succesful double-spend.

[dkbit98]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

Why would you want to so double spend?
Not sure it will work anyway, depending on mempool and other things,
but it is 2 exact same transactions sent from same wallet sent to some other wallet.

Again, DO NOT experiment with double spend!

Hi please don’t worry for me I just want to know how to do it. And also what do you mean by sending the same transaction twice ?
I want to know how to send bitcoin and make it back to my wallet. I think it’s still possible because somebody that I know did it but he does not want to show it to me that’s why I’m coming here to ask it to you.
Please help me

  no comment
 

[ariellee]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

why, so you can fool someone into accepting a zero-confirmation transaction, only to send the funds back to yourself?

anyway, the easiest way is to use something like double-spend.py---see here: https://bitcoin.stackexchange.com/a/32347

Basic usage:

./double-spend.py <address> <amount>

Creates two transactions in succession. The first pays the specified amount to the specified address. The second double-spends that transaction with a transaction with higher fees, paying only the change address. In addition you can optionally specify that the first transaction additional OP-RETURN, multisig, and "blacklisted" address outputs. Some miners won't accept transactions with these output types; those miners will accept the second double-spend transaction, helping you achieve a succesful double-spend.

What do you mean by pay the change address? Can I have a live demo ? The tools  isn’t working well according to the comments.

Thanks

[TimeBits]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

You don`t double spend.

If you want to double spend, the first thing you do is find the tallest building, now jump off it!

[pooya87]

what do you mean by sending the same transaction twice ?

What do you mean by pay the change address?

based on your comments here, it seems to me like you may not know the basics of how bitcoin works. maybe it is best if you start there. read what is a transaction output, what is a change address, how transactions work, how the network works,... and then start looking for how to double spend! you can't jump in to the end.

[UserU]

It's like asking how to clone money.

Both are unethical and dishonest.

[tsaroz]

Almost all people and most of the sites requires you to have a number of confirmations before making your deal done.
Even the sites that advertise zero confirmation deposit require you confirmations before withdrawing.

The easiest way to double spend is to load your private key in multiple wallet and send to different address before any of them confirms.

[Thirdspace]

"true" double spending is not possible
but if a transaction hasn't received any confirmation, you can try to double spend (redirect) it
check this Open Source Automatic Double-Spending tool - Recover your stuck transaction
that is a thread of such tool and it's a fork of coinb.in, use it at your own risk!
after you understand how it works, I advise you to do this manually and offline using coinb.in

[Sonu_titu]

There are threads on Bitcointalk already explaining the complete double spend check this out:
https://bitcointalk.org/index.php?topic=5139225.msg50889936#msg50889936

In the above thread @Bitcoin_Arena, @o_e_l_e_o and few more have explained enough on this topic. Hope it will help you understand.

[crwth]

I like how you say, "educational purposes"

Why not search it in Google and use the researches that are there in your results? I think it's easy to do that but I hope you share what you are planning to do or put out the "educational purpose" you are talking about. Lol.

[Dreamchaser21]

I like how you say, "educational purposes"

Why not search it in Google and use the researches that are there in your results? I think it's easy to do that but I hope you share what you are planning to do or put out the "educational purpose" you are talking about. Lol.

If you want to know something, its true that its easy to search regarding on that topic so google is the best option I believe. Well, i never tried to do this such risky move and maybe OP is just asking for some experiences here. I might also interested to hear more about this, I don't know if this is working well so maybe anyone can share their experience and thoughts.

[crwth]

If you want to know something, its true that its easy to search regarding on that topic so google is the best option I believe. Well, i never tried to do this such risky move and maybe OP is just asking for some experiences here. I might also interested to hear more about this, I don't know if this is working well so maybe anyone can share their experience and thoughts.

That is why Google became a verb. From what I have learned ever since I came to this forum, I know that it is not possible because of the blockchain and miners verifying each block. That’s why it has become a solid digital currency because “double spending” can’t be done. At least, that’s what i know from learning here. Or I may have missed something?

[Johnzky]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

You don`t double spend.

If you want to double spend, the first thing you do is find the tallest building, now jump off it!

No You made me laugh on that mate 😂😂😂

Just like the comment above there is a possibilities that double spend can be use to mislead or to scam others,so basically this thing must not exist because there’s nothing this can bring good for crypto but abuse of knowledge and possibly scamming

[Khaos77]

Hi, is anybody there who can please explain me how to do double spend ?
I heard that is was possible to make it on coinb.in but I don’t really know it works. I am only asking it for an educational purpose. Please please please
If my post is in the wrong section please tell me.
Thank you

Funny, how many of the same users tout how bitcoin is so secure, but are skittish of explaining how to doublespend on BTC.

Educational Purpose Only
Option 1:
1st , you have to find someone dumb enough to accept zero confirmations

then send the agreed upon amount of bitcoins, with either zero or almost zero transaction fee
get product or service and leave

then send the entire amount of that wallet to another address, with an extremely high transaction fee.

The Miners will process your transaction with the highest fee before the no fee , thereby negating the 1st transaction and helping you to double spend.

* Now all any receivers of bitcoins have to do to stop this from happening is wait the required # of confirmations, and it protects them from the above doublespend attack.* * Recommended to wait at least 3 confirmations.*

* Note: Some ALTS process transactions in the order received and do so at fixed fees, so the above attack would fail against them.*

Option 2:
Coerce the 4 top bitcoin pool operators into colluding to orphan 3 blocks excluding your 1st transaction
and replace it with one sending to another address you own.
This one , their is no protection for or defense against if you use bitcoin.

* This is the reason that many PoS coins are more secure than bitcoin,
but next you are going to hear people tout hashrate and energy waste like they actually matter in securing bitcoin,
but the truth is 4 pool operators are given over 51% control on a daily basis, corrupt them and the bitcoin network is your doublespend playground.*

 

[BitcoinPanther]

Double-spending is spending the same currency or token for two or more transactions.
It is like cheating since you have one single amount but you want to spend it for two or more transactions since the transactions need to be confirmed first before it will be considered as a successful transaction.

I don't think it is possible in Bitcoin. Bitcoin and Blockchain Technology were invented to prevent double-spending of digital currency. That is how Satoshi Nakamoto solved the problem of double-spending which is one of the factors of the financial crisis during 2008.

I believe by principle, if you try that, the double-spending attempt will be considered both canceled transactions.

[sarmrakib]

You didn't make it clear what really you wanna know .I think you wanted to know how to double btc or something else .However its really hard to double any investment but it is realty possible into crypto .But you need to have vast knowledge behind that .You can make it by trading ,gambling .But it always so risky to make profit in quick .So i wanna suggest to study on crypto you can make double your capital easily.

[YuginKadoya]

You didn't make it clear what really you wanna know .I think you wanted to know how to double btc or something else .However its really hard to double any investment but it is realty possible into crypto .But you need to have vast knowledge behind that .You can make it by trading ,gambling .But it always so risky to make profit in quick .So i wanna suggest to study on crypto you can make double your capital easily.

I really think it is not to double his BTC but to make a transaction and to transact it back to the same wallet again If my understanding was right, And I guess this is a newbie question and honestly didn't know a thing about how a bitcoin transaction works, And he then added that his friend doesn't want to teach him about it and that is why he is trying his luck asking here in the forum and asking is we can provide him with some example and clips he can watch, Well, we can not blame him about it and he is just asking nicely in my opinion but the thing is engaging with Bitcoin you will need to have basic knowledge about it first.