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Author Topic: How to stop 'double spend' attack  (Read 3697 times)
nottm28 (OP)
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July 07, 2014, 10:26:42 PM
 #1

I lost 2 btc on updown.bt - I wouldn't have even known if my local block chain had become corrupted and I was forced to re-download the chain.

When I re-downloaded the chain I was 2 BTC down. I checked transactions and found that a few gambles I made on updown.bt - the 'winnings' were dowble spends.

Here's an example...

tx:79ac7a63ecc1c9357b6b8c69b5e4738de8977ac72b916af4cb0d7f61a2266dad

Clicking on a few links shows the payout in red - my 'winnings' were a double spend.

This is pretty bad for BTC - how do I know that BTC I receive is real?

Twats

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kwukduck
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July 07, 2014, 10:30:43 PM
 #2

You could have known as that transaction never shows any confirmations

14b8PdeWLqK3yi3PrNHMmCvSmvDEKEBh3E
nottm28 (OP)
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July 07, 2014, 10:39:12 PM
 #3

I'm telling you this is something new - the transactions that won over the last two weeks from updown are all showing payment 'n/a' - when I follow through the sent transaction numbers I see 'warning this address is using double spends'

This is shit - follow through these txs

2cda7b3fc5d1a4773376f80b4211d8a4dd3a8b70c75c37e34e684169e7749514  (sent 0.1123)
1c5ec45d5d8294c568cc3f950cfbf9f64b03d08986f3399c935a7aadade8597f
2cda7b3fc5d1a4773376f80b4211d8a4dd3a8b70c75c37e34e684169e7749514

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BitCoinDream
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July 07, 2014, 10:57:08 PM
 #4

I'm telling you this is something new - the transactions that won over the last two weeks from updown are all showing payment 'n/a' - when I follow through the sent transaction numbers I see 'warning this address is using double spends'

This is shit - follow through these txs

2cda7b3fc5d1a4773376f80b4211d8a4dd3a8b70c75c37e34e684169e7749514  (sent 0.1123)
1c5ec45d5d8294c568cc3f950cfbf9f64b03d08986f3399c935a7aadade8597f
2cda7b3fc5d1a4773376f80b4211d8a4dd3a8b70c75c37e34e684169e7749514

There is no problem with any of the above transactions... u r making some mistake. No double spending at all !!! Please provide us screenshot.

nottm28 (OP)
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July 07, 2014, 10:58:13 PM
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https://www.flickr.com/photos/125077066@N04/14577098696/

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July 07, 2014, 11:05:16 PM
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Please provide the image link. Cant see the address here. Or upload it in imgur.

Keyser Soze
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July 07, 2014, 11:07:21 PM
 #7

I'm telling you this is something new - the transactions that won over the last two weeks from updown are all showing payment 'n/a' - when I follow through the sent transaction numbers I see 'warning this address is using double spends'

This is shit - follow through these txs

2cda7b3fc5d1a4773376f80b4211d8a4dd3a8b70c75c37e34e684169e7749514  (sent 0.1123)
1c5ec45d5d8294c568cc3f950cfbf9f64b03d08986f3399c935a7aadade8597f
2cda7b3fc5d1a4773376f80b4211d8a4dd3a8b70c75c37e34e684169e7749514

I'm not sure what to look for in any of the transactions posted. It sounds like your wallet removed the balance associated with transactions that have been unconfirmed for a long time.


Please provide the image link. Cant see the address here. Or upload it in imgur.
It is a screenshot of 12AaGnt5QT2N4Wxv6JP7i7ejSYRcm7nmRh on blockchain.info
nottm28 (OP)
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July 07, 2014, 11:08:59 PM
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Please provide the image link. Cant see the address here. Or upload it in imgur.

https://i.imgur.com/U5INaaW.png

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July 07, 2014, 11:09:33 PM
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your links look fine to me, you have a problem yourself.  Stop spreading crap, EVERYONE told you on the other thread that only YOU ARE SEEING A DOUBLE SPEND MESSAGE
nottm28 (OP)
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July 07, 2014, 11:10:20 PM
 #10

your links look fine to me, you have a problem yourself.  Stop spreading crap, EVERYONE told you on the other thread that only YOU ARE SEEING A DOUBLE SPEND MESSAGE

Hey dick face - see the imgur link

https://i.imgur.com/U5INaaW.png

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July 07, 2014, 11:11:09 PM
 #11


Im really pissed of you, you are posting all shit, and you are mad only because you lost 2 btc gambling, stop your gambling habit instead of posting this shit, you have posted this almost in every section of the forum.
Someone already said that a double spend tx never gets confirmed. and only you are getting that error msg
jjc326
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July 07, 2014, 11:11:49 PM
 #12

your links look fine to me, you have a problem yourself.  Stop spreading crap, EVERYONE told you on the other thread that only YOU ARE SEEING A DOUBLE SPEND MESSAGE

Hey dick face - see the imgur link

https://i.imgur.com/U5INaaW.png


"dick face" that's nice.  Grow up, I'm just telling you you're the only one seeing that

you lost too much BTC on the site, that's why you're mad. Take a deep breath and get away from gambling for a bit.
nottm28 (OP)
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July 07, 2014, 11:12:54 PM
 #13

your links look fine to me, you have a problem yourself.  Stop spreading crap, EVERYONE told you on the other thread that only YOU ARE SEEING A DOUBLE SPEND MESSAGE

Hey dick face - see the imgur link

https://i.imgur.com/U5INaaW.png


"dick face" that's nice.  Grow up, I'm just telling you you're the only one seeing that

you lost too much BTC on the site, that's why you're mad. Take a deep breath and get away from gambling for a bit.

ok - bit upset - sorry about that - still something new and wrong here

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nottm28 (OP)
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July 07, 2014, 11:13:49 PM
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Im really pissed of you, you are posting all shit, and you are mad only because you lost 2 btc gambling, stop your gambling habit instead of posting this shit, you have posted this almost in every section of the forum.
Someone already said that a double spend tx never gets confirmed. and only you are getting that error msg

These txns were confirmed OK over the last 2 weeks - no doubt about it - only when I reloaded the block chain did I find this problem

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jjc326
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July 07, 2014, 11:14:23 PM
 #15

your links look fine to me, you have a problem yourself.  Stop spreading crap, EVERYONE told you on the other thread that only YOU ARE SEEING A DOUBLE SPEND MESSAGE

Hey dick face - see the imgur link

https://i.imgur.com/U5INaaW.png


"dick face" that's nice.  Grow up, I'm just telling you you're the only one seeing that

you lost too much BTC on the site, that's why you're mad. Take a deep breath and get away from gambling for a bit.

ok - bit upset - sorry about that - still something new and wrong here

I'm actually inclined to possibly believe you because I'm in the updown sig campaign and something funny appears to be going on with that.  
nottm28 (OP)
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July 07, 2014, 11:19:36 PM
 #16

your links look fine to me, you have a problem yourself.  Stop spreading crap, EVERYONE told you on the other thread that only YOU ARE SEEING A DOUBLE SPEND MESSAGE

Hey dick face - see the imgur link

https://i.imgur.com/U5INaaW.png


"dick face" that's nice.  Grow up, I'm just telling you you're the only one seeing that

you lost too much BTC on the site, that's why you're mad. Take a deep breath and get away from gambling for a bit.

ok - bit upset - sorry about that - still something new and wrong here

I'm actually inclined to possibly believe you because I'm in the updown sig campaign and something funny appears to be going on with that. 

If you check my post history - I wouldn;t post ike this unless I thought there was something seriously wrong here...

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July 07, 2014, 11:19:45 PM
 #17


Well... now I can see and compare things. Here is my explanation...

U saw the message when the Tx was not confirmed. Blockchain.info somethimes show this when multiple unconfirmed Tx are going out of an address, which is normal from a real time gambling site. Now, u saw that first.

Here begins the second part. Blockchain.info is distributed by cloudflare. Cloudflare catched that message as static against your public IP and hence keep showing it to u even when the Tx has got confirmation.

...This is what I understand out of the whole fiasco... may be wrong. If it is correct, then u log out, have a drink, have sleep, come back after a few hour and login ...u'll see everything is fine with this address... Just like what we are seeing now.

Keyser Soze
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July 07, 2014, 11:21:15 PM
 #18

These txns were confirmed OK over the last 2 weeks - no doubt about it - only when I reloaded the block chain did I find this problem
What txids do you have that were confirmed up to two weeks ago, but suddenly were not? Nothing appears to be wrong with any of the txids you have given in this thread.
nottm28 (OP)
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July 07, 2014, 11:23:34 PM
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Well... now I can see and compare things. Here is my explanation...

U saw the message when the Tx was not confirmed. Blockchain.info somethimes show this when multiple unconfirmed Tx are going out of an address, which is normal from a real time gambling site. Now, u saw that first.

Here begins the second part. Blockchain.info is distributed by cloudflare. Cloudflare catched that message as static against your public IP and hence keep showing it to u even when the Tx has got confirmation.

...This is what I understand out of the whole fiasco... may be wrong. If it is correct, then u log out, have a drink, have sleep, come back after a few hour and login ...u'll see everything is fine with this address... Just like what we are seeing now.

These txns were over the last 2 weeks - I havent been on updown for 3 days - all of the winnings txns from them over the last two weeks are showing payment address n/a and when I click thoough the txn ids on block chain I keep getting the 'double spend' warning in the image I posted.

I now find that when I refresh the page the warning disappears - but then I click on a few more red links and find another. Even more worrying. And my wallet is 2 BTC light at the end of the day - so there is a BIG warning sign here.

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July 07, 2014, 11:23:45 PM
 #20

These txns were confirmed OK over the last 2 weeks - no doubt about it - only when I reloaded the block chain did I find this problem
What txids do you have that were confirmed up to two weeks ago, but suddenly were not? Nothing appears to be wrong with any of the txids you have given in this thread.

I assume, OP is a non-tech guy. He is talking about Tx and posting addresses !!! We should consider the last Tx associated with these addresses.

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