Quote from: Itskok on October 07, 2016, 05:09:28 PM

This is exactly what I am trying to do, not just analyzing the Nodes in real time, also analyzing the input's "history",

Great. So, you check to make sure the transaction paid a reasonable transaction fee, that the inputs are all already confirmed, that there are no excessively small output or unusual output scripts, and that there are no competing transactions being broadcast by other nodes on the network. Once you've verified all that the transaction is safer to accept than cash, check, or credit card (all of which can be used fraudulently). What's the problem?

Quote from: Itskok on October 07, 2016, 05:09:28 PM

But it seems that not too much change from this days :
https://bitcointalk.org/index.php?topic=3441.msg48365#msg48365

Actually several things have changed. For example, back then transactions would make it into the next block even if they didn't include a transaction fee. Now confirmations take a LOT longer if you don't include a transaction fee. Also, some miners are now reluctant to confirm transactions that have excessively small value outputs.

Quote from: Itskok on October 07, 2016, 05:09:28 PM

Maybe its too complicated,

Nope. Pretty simple. Check inputs, check outputs, check for fees and competing transactions. That's it.

Quote from: Itskok on October 07, 2016, 05:09:28 PM

or maybe there is not enough double spend transaction out there?

They are difficult to do, so they aren't common. Credit card fraud, check fraud, and counterfeit cash are all probably more common than Bitcoin double spends. Perhaps businesses should think about not accepting credit cards and cash since there is such a risk? Bitcoin would be much safer.

Quote from: Itskok on October 07, 2016, 05:09:28 PM

what is sure is that the "Double spend" issue is one of the biggest barriers for Bitcoin to be adopted by "regular" payments companies/Financial institutions,

Only among those businesses that are too uneducated or unknowledgable to understand risk management and are incapable of comparing the bitcoin risks to the risks associated with the other payment systems that they accept.

Quote from: Itskok on October 07, 2016, 05:09:28 PM

Its 10 minutes Bitcoin against 0.08 mil second Visa..

Nope. Visa transactions can be double-spent for more than 3 months easier than bitcoin can be double-spent in 1 second.

Quote from: Itskok on October 07, 2016, 05:09:28 PM

they are really afraid from it as far as I spoke with some of them.

Then they don't understand it, and you've done a poor job of educating them.

Quote from: Itskok on October 07, 2016, 05:09:28 PM

Someone know where I can find "All time" statistics about double spend transactions?

There is no "Bitcoin Company" in charge of bitcoin. Who would you ask for the information? I'm not aware of anyone making any attempts to record all the fraudulent double-spend attempts or how many of them were successful. You'll probably need to hire a polling company to do a scientific poll for you. You could try contacting Coinbase or BitPay and see if they have any internal records they'd be willing to share with you.

Quote from: Itskok on October 07, 2016, 05:09:28 PM

we need to wait for 4-5 to be sure

What? Why would you be any more sure with 4 confirmations than 2? What's so magical about the number 4?

Quote from: Itskok on October 07, 2016, 05:09:28 PM

that's gonna take 5-6 minutes at least, that's a lot of time for a digital money,

You aren't very good at maths, are you? If the average time between blocks is 10 minutes, and you want to wait for 4 blocks, it's going to take a LOT more than 6 minutes (on average). Fortunately, you don't need to wait that long in most cases.

Quote from: Itskok on October 07, 2016, 05:09:28 PM

Maybe some Block-scale will solve that during the years too.

Not sure what you're trying to say there.