Question is: how could a Joe like me that has 0 hash power be able to double spend even with 0 confirmation transactions that sooner or later will be identified?
Well you can't technically make a double spent. You could however 'double spend' funds from a merchant in case of a bug in their software or something. 
Topic: Has anybody ever successfully double spent? - page 3. (Read 3123 times)
Question is: how could a Joe like me that has 0 hash power be able to double spend even with 0 confirmation transactions that sooner or later will be identified?
i was thinking about that too and found on google how to do it though i quit because i couldnt find any gambling sites that accept 0 confirms deposits and payouts instantly 
Question is: how could a Joe like me that has 0 hash power be able to double spend even with 0 confirmation transactions that sooner or later will be identified?
There have been several well-documented attempts but never successfully as far as I am aware
I don't think there have ever been double spending on Bitcoin. There has been case with altcoins which are easy to attack due to their low hashrate.
If Bitcoin is going to be attacked its going to be a coalition of big pools for whatever reasons. In that case everyone will get disrupted and it will be a huge event, and possibilities like this exist in all spheres of life.
If Bitcoin is going to be attacked its going to be a coalition of big pools for whatever reasons. In that case everyone will get disrupted and it will be a huge event, and possibilities like this exist in all spheres of life.
There was a fork in the blockchain back in March 2013 I think, due to incompatibility between new and old versions of Bitcoin QT. During that period, I seem to remember there was a successful double spend against an exchange. The situation was dealt with very quickly and I think the double spend was reversed.
As far as I'm aware, there haven't been any major successful double spends of Bitcoin since then.
As far as I'm aware, there haven't been any major successful double spends of Bitcoin since then.
there have been no double spends of bitcoin.. EVER
there have been instances that services have given away DIFFERENT currencies multiple times, but there is no actual double spend of bitcoin. the fault is of service providers not interpreting transactions appropriately.
That has to do with 51% attacks right? I haven't heard of any cases either. I did some research and there was a successful double-spend on 2013 (of course people already told you that lol) other than that nothing.
I remember reading it when I first started with bitcoin. Didn't understand much of it at the time.
The bitcoin nodes are so well linked. I think double spending on a healthy bitcoin network is extremely difficult. There is a page at blockchain.info on double spend attempts. I think none of them are successful:
https://blockchain.info/double-spends
I don't really get the page you linked though, on some of them it says "spent" which means the transaction was successful? sorry I'm newb
For example, a $10,000-equivalent double-spend was successfully issued during the March 2013 blockchain fork event: https://bitcointalksearch.org/topic/a-successful-double-spend-us10000-against-okpay-this-morning-152348
The price rallied significantly in the subsequent month.
The price rallied significantly in the subsequent month.
I remember reading it when I first started with bitcoin. Didn't understand much of it at the time.
And if so, is there a list of people that have gained from double spending and amounts that they were successful at double spending?
The bitcoin nodes are so well linked. I think double spending on a healthy bitcoin network is extremely difficult. There is a page at blockchain.info on double spend attempts. I think none of them are successful:
https://blockchain.info/double-spends
I don't really get the page you linked though, on some of them it says "spent" which means the transaction was successful? sorry I'm newb
For example, a $10,000-equivalent double-spend was successfully issued during the March 2013 blockchain fork event: https://bitcointalksearch.org/topic/a-successful-double-spend-us10000-against-okpay-this-morning-152348
The price rallied significantly in the subsequent month.
The price rallied significantly in the subsequent month.
I remember reading it when I first started with bitcoin. Didn't understand much of it at the time.
And if so, is there a list of people that have gained from double spending and amounts that they were successful at double spending?
The bitcoin nodes are so well linked. I think double spending on a healthy bitcoin network is extremely difficult. There is a page at blockchain.info on double spend attempts. I think none of them are successful:
https://blockchain.info/double-spends
There was a fork in the blockchain back in March 2013 I think, due to incompatibility between new and old versions of Bitcoin QT. During that period, I seem to remember there was a successful double spend against an exchange. The situation was dealt with very quickly and I think the double spend was reversed.
As far as I'm aware, there haven't been any major successful double spends of Bitcoin since then.
As far as I'm aware, there haven't been any major successful double spends of Bitcoin since then.
No. I'm not an overpowered guy that controls and/or can fool trusted bitcoin nodes.
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I have never heard of actually happening but the idea is that it would shatter the confidence crashing the coin.
double spend by a 51% attacker doing a multi block reorg would be confidence shattering.
double spend by a hacker on a 0 confirmation transaction, not so much.
Sure. Go ahead and accept BTC for payment and accept zero-conf transactions. Sell digital goods like Steam codes where the exchange is instant.
It doesn't happen very often because the market regularly prunes stupid people out.
ETA: No cheating by having the service check against the tx queue for double-spends.
It doesn't happen very often because the market regularly prunes stupid people out.
ETA: No cheating by having the service check against the tx queue for double-spends.
I have never heard of actually happening but the idea is that it would shatter the confidence crashing the coin.
No, the circumstances under which double-spends are theoretically possible are well-understood; a successful double-spend under such a circumstance wouldn't be particularly meaningful.
For example, a $10,000-equivalent double-spend was successfully issued during the March 2013 blockchain fork event: https://bitcointalksearch.org/topic/a-successful-double-spend-us10000-against-okpay-this-morning-152348
The price rallied significantly in the subsequent month.
And if so, is there a list of people that have gained from double spending and amounts that they were successful at double spending?
I am just wondering because lots of people talk about double spending being a major problem, yet I don't really see any cases of it. Just wondering if I missed them.
I am just wondering because lots of people talk about double spending being a major problem, yet I don't really see any cases of it. Just wondering if I missed them.
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