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Topic: How to stop 'double spend' attack - page 3. (Read 3761 times)

sr. member
Activity: 462
Merit: 250
July 07, 2014, 07:32:52 PM
#52
Lol so we need some forensic investigation in here, but why are not more users of updown complaining about it?? or is because they havent spend the amount received?  Cheesy
In that case he could have gone over localbitcoins and sold thousands of dollars of btc worth or sell bitcoins even at cash in person.
hero member
Activity: 574
Merit: 500
July 07, 2014, 07:30:40 PM
#51
I'm not sure how I'm going to be able to accept a txn as verified now...
hero member
Activity: 574
Merit: 500
July 07, 2014, 07:29:34 PM
#50
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.

Forget Sig campaign. If double spending can be done so easily, Bitcoin will crash tomorrow.

Yeah - that's my point!

It was always my understanding that anyone could double spend, you didn't need to have 51% hash power or whatever.  That's why you have to wait for a confirmation or two, right?

No, these were small txns over the last two weeks adding up to 2 BTC 'winnings' - some of these txns has hundreds of confirmations showing in my wallet. Only when I re-downloaded the entire block chain did I find the problem.

So if you had like lets say 5 btcs in your wallet, the ones who dissapeared could have not been the updown ones, did you verify if you dont have any 0 confirmation tx in your wallet recently? maybe the 2 btc amount missing is from other txs

No, the only other txns are from mining at slush's pool - and the total I have remaining matches the total when I add up the payments from slush's site. The only missing txns are from updown.
sr. member
Activity: 462
Merit: 250
July 07, 2014, 07:26:41 PM
#49
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.

Forget Sig campaign. If double spending can be done so easily, Bitcoin will crash tomorrow.

Yeah - that's my point!

It was always my understanding that anyone could double spend, you didn't need to have 51% hash power or whatever.  That's why you have to wait for a confirmation or two, right?

No, these were small txns over the last two weeks adding up to 2 BTC 'winnings' - some of these txns has hundreds of confirmations showing in my wallet. Only when I re-downloaded the entire block chain did I find the problem.

So if you had like lets say 5 btcs in your wallet, the ones who dissapeared could have not been the updown ones, did you verify if you dont have any 0 confirmation tx in your wallet recently? maybe the 2 btc amount missing is from other txs
hero member
Activity: 574
Merit: 500
July 07, 2014, 07:26:31 PM
#48
z
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.

Forget Sig campaign. If double spending can be done so easily, Bitcoin will crash tomorrow.

Yeah - that's my point!

So now explain this carefully..

You got 2 btc as a payment from updown right?

They dissapeared when you tried to send them to another address?

how many confirmations did you got on that tx, the bitcoins you received?

show the amount you did receive from updown and show the address where you received it



Yes I got 2 btc as a payment from updown right? - in small txns over the last 2 weeks

No, they disappeared when I was forced to re-download the entire block chain

Hundreds of confirmations on the older txns

I can't show the received amounts as those txns are no longer in my wallet - but I have posted the sent txns - and if you follow them then you get the double spend warning.
legendary
Activity: 2394
Merit: 1216
The revolution will be digital
July 07, 2014, 07:24:42 PM
#47
Time for Death and Taxes to make a surprise appearance.

Ok...so I'm not alone who is badly missing him now.

I'm also missing Gavin, Theymos, Danny Hamilton, Gweedo.

Need them on this thread... NOW !!!
hero member
Activity: 574
Merit: 500
July 07, 2014, 07:22:48 PM
#46
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.

Forget Sig campaign. If double spending can be done so easily, Bitcoin will crash tomorrow.

Yeah - that's my point!

It was always my understanding that anyone could double spend, you didn't need to have 51% hash power or whatever.  That's why you have to wait for a confirmation or two, right?

No, these were small txns over the last two weeks adding up to 2 BTC 'winnings' - some of these txns has hundreds of confirmations showing in my wallet. Only when I re-downloaded the entire block chain did I find the problem.
legendary
Activity: 1862
Merit: 1011
Reverse engineer from time to time
July 07, 2014, 07:21:19 PM
#45
Time for Death and Taxes to make a surprise appearance.
sr. member
Activity: 462
Merit: 250
July 07, 2014, 07:18:43 PM
#44
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.

Forget Sig campaign. If double spending can be done so easily, Bitcoin will crash tomorrow.

Yeah - that's my point!

So now explain this carefully..

You got 2 btc as a payment from updown right?

They dissapeared when you tried to send them to another address?

how many confirmations did you got on that tx, the bitcoins you received?

show the amount you did receive from updown and show the address where you received it

hero member
Activity: 700
Merit: 500
July 07, 2014, 07:16:56 PM
#43
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.

Forget Sig campaign. If double spending can be done so easily, Bitcoin will crash tomorrow.

Yeah - that's my point!

It was always my understanding that anyone could double spend, you didn't need to have 51% hash power or whatever.  That's why you have to wait for a confirmation or two, right?
hero member
Activity: 574
Merit: 500
July 07, 2014, 07:14:41 PM
#42
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.

Forget Sig campaign. If double spending can be done so easily, Bitcoin will crash tomorrow.

Yeah - that's my point!
hero member
Activity: 574
Merit: 500
July 07, 2014, 07:14:15 PM
#41
now it dissapeared, but i can testify that i saw that error on address https://blockchain.info/es/address/16AxyGBRFQt1FETWtYNVGJFyv6udU6V3ER .

not sure if its a bug from blockchain or there is something wrong in those addreses

Well my wallet is 2 BTC light - so it's not an anomaly - it's real...
legendary
Activity: 2394
Merit: 1216
The revolution will be digital
July 07, 2014, 07:13:15 PM
#40
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.

Forget Sig campaign. If double spending can be done so easily, Bitcoin will crash tomorrow.
sr. member
Activity: 462
Merit: 250
July 07, 2014, 07:12:52 PM
#39
now it dissapeared, but i can testify that i saw that error on address https://blockchain.info/es/address/16AxyGBRFQt1FETWtYNVGJFyv6udU6V3ER .

not sure if its a bug from blockchain or there is something wrong in those addreses
hero member
Activity: 700
Merit: 500
July 07, 2014, 07:09:20 PM
#38
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721

Well if this is true, wow, and why wasn't this caught by anyone earlier?  It would have a big impact on the sig campaign as well.
sr. member
Activity: 462
Merit: 250
July 07, 2014, 07:06:14 PM
#37
update

The operator of those addreses can be doing something real scammy, im reporting now i can see that error too

https://bitcointalksearch.org/topic/m.7726721
hero member
Activity: 574
Merit: 500
July 07, 2014, 07:02:02 PM
#36
An double spend attacked wallet...

http://i.imgur.com/TdZfNG1.png

So your wallet got attacked not those addresses.

Just so happens that only the updown txns are affected? unlikely...

Point out what you define "double spend" on that screenshot of your wallet, it seems like you dont know what can be a double spent

Because if you saw some of your balance dissapear is because the tx dint go trough well and it was returned to the sender, this kind of txs never gets one confirmation, so in this case they have to send it to you again. this is an uncommon error of the clients not double spending.

updown cant double spend anything! only if you have more than 51% of hashing power you can do it, educate yourself

Ok, I'm pretty sure you seen my images from block chain and the image from my wallet - if you can't see a problem here then carry on - enjoy.
hero member
Activity: 574
Merit: 500
July 07, 2014, 07:00:38 PM
#35
An double spend attacked wallet...

http://i.imgur.com/TdZfNG1.png

So your wallet got attacked not those addresses.

Just so happens that only the updown txns are affected? unlikely...

Can u plz specify something ? Which one is affected according to your belief ?

1. Transaction

2. Address

3. Wallet




The transactions that updown.bt made to me (my winnings) were double spend txns. They appeared in my wallet just fine but when I was forced to re-download the blockchain, those txns were marked as 'double spends' on the block chain.

I don't have the txns in my wallet for the receiving coins any longer. But I do have the txns that I made to place my bets. Those are the txns I listed above. You can follow the path of a bitcoin on blockchain info so I searched it to see where my coins ended up by following my own payment txns. By doing this I get warnings that the addresses I was sending to were performing double spend attacks.

Basically I can't trust what's im my wallet - it might be showing perfectly fine, but if I re-download the blockchain then it may disappear - this is bad shit.
sr. member
Activity: 462
Merit: 250
July 07, 2014, 06:52:20 PM
#34
An double spend attacked wallet...

http://i.imgur.com/TdZfNG1.png

So your wallet got attacked not those addresses.

Just so happens that only the updown txns are affected? unlikely...

Point out what you define "double spend" on that screenshot of your wallet, it seems like you dont know what can be a double spent

Because if you saw some of your balance dissapear is because the tx dint go trough well and it was returned to the sender, this kind of txs never gets one confirmation, so in this case they have to send it to you again. this is an uncommon error of the clients not double spending.

updown cant double spend anything! only if you have more than 51% of hashing power you can do it, educate yourself
legendary
Activity: 2394
Merit: 1216
The revolution will be digital
July 07, 2014, 06:50:37 PM
#33
An double spend attacked wallet...

http://i.imgur.com/TdZfNG1.png

So your wallet got attacked not those addresses.

Just so happens that only the updown txns are affected? unlikely...

Can u plz specify something ? Which one is affected according to your belief ?

1. Transaction

2. Address

3. Wallet


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