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Author Topic: Odd pattern in BitcoinMonitor  (Read 10521 times)
theymos
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April 19, 2011, 06:02:05 PM
 #61

There are multiple transactions showing up which have a combined size of 94600 BTC.
Is this a double-spending attempt or does someone actually have multiple chunks of 94600 BTC?

They're the same coins.

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April 19, 2011, 10:22:31 PM
 #62

Since the sending of the money doesn't need to be instantaneous, how about a captcha system kinda like this:

You collect a bank of images, things like group photos, photos of animals, landmarks etc (perhaps simply by scraping the results of image searchs, taking note of the keywords used, and if the site the image comes from got tags for the image, take note of the tags too, ) .

Each time someone tries to request coins from the faucet, the server randomly picks one of the pictures, distorts it a bit, in a unique way each time, taking note of the way it's distorted to remap distorted corrdinates back to original; and then asks the person to click where in the picture somthing is (selecting what based on the keywords used to find the picture and associated tags if any; things like the front left headlight of the car, the nose of the cat, the tip of the Eiffel tower, the biggest digit in the picture, the face of the youngest person in the picture etc).

Remaping the clicks to the undistorted coordinates, the server then starts ranking the clicks in terms of how close to the average of the other clicks for that same feature. But  each time a same person refreshes or asks to try a different picture the weighting of their vote for the coordinate of the picture average is reduced, so if someone tries several times in order to find the same picture and being asked for the same feature, to try to distort the average in their favour, their attempt of tampering will not easilly outvote legit clicks.



Perhaps besides the geometric distortion, it might be good to also add other interferences, like hue, saturation and brightness noise and gradients, invert the color in small randomly shaped part, "burn" out little holes here and there, add a few blur gradients (kinda like randrops on the camera lens), overlay small randomly shaped patches with the colors "solarized", the resolution reduced (pixelazing the image) etc; basicly all sorts of image "filters" that would confuse computer vision, specially when combined, but (at least most of the time) still leave the contents of the image easilly identifyable by humans.

(I dont always get new reply notifications, pls send a pm when you think it has happened)

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ironwolf
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April 19, 2011, 10:54:55 PM
 #63

Hi all. I just looked at the monitor again and I'm seeing this stripe pattern— again, and it looks like Gavin's opened the faucet again. So, attack in progress again?

Ironwolf

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April 19, 2011, 11:24:31 PM
 #64

No, Its in 100BTC. gavin wont give 100btc per person.
Also some guy is sending 0.02 & 0.12 continuously, to take bandwidth?
 
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April 19, 2011, 11:40:29 PM
 #65

Also some guy is sending 0.02 & 0.12 continuously, to take bandwidth?

I bet that's the Bitcoin Bubble game. A lot of 0.01 and 0.02 going on there. http://bitcointalk.org/index.php?topic=6117.0

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Anonymous
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April 20, 2011, 12:50:06 AM
 #66

Post in http://free.witcoin.com and if another human likes it you get voted up.

free bitcoins - if you entertain us that is  Cheesy

If a bot can come up with something I like then all power to it for making me laugh or causing a reaction.

Hint: you wont get voted up for submitting a million viagra ads.
I really don't understand what you saying.
You mocking up me or rena or telling some thing else?


He's saying that Witcoin is a better way for newbies to get coins than the Faucet. It's like Reddit, except votes cost small fractions of a Bitcoin, and the person who posted the comments gets some large fraction of the money collected by voting.


No its a different way not a better way. Something as simple as you posting a pic or a photoshop of a bitcoin logo in a funny place would convince me you've done something to earn a free coin.

http://free.witcoin.com if you want to try it out. Also a percentage of site profits go to the bitcoin faucet if people choose. http://witcoin.com/charity/The-Bitcoin-Faucet


This is a complementary service not a replacement.
ironwolf
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April 20, 2011, 01:07:37 AM
 #67

No, Its in 100BTC. gavin wont give 100btc per person.

If I'm not mistaken, doesn't the "total" reflect the sum of the "Ins" on the transfer, while the other numbers represent the "Outs", in this case 1 bitcent and about 100 bitcoins in change. This is the same pattern I witnessed when the faucet was drained before, but it was 0.05 BTC at a time, and this was 0.01 BTC.
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April 20, 2011, 07:56:05 AM
 #68

No, Its in 100BTC. gavin wont give 100btc per person.

If I'm not mistaken, doesn't the "total" reflect the sum of the "Ins" on the transfer, while the other numbers represent the "Outs", in this case 1 bitcent and about 100 bitcoins in change.

That's correct. Well, the total reflects the sum of all "outs" and then the outs are listed separately in brackets. Eventually I plan to list the sum of the "ins" as well, which also makes it possible to calculate the fee (total in - total out = fee). But just from looking at a single transaction you don't actually know the sum of the "ins". You have to look up the in-transactions in the block chain / database. I haven't implemented that yet and it will probably require a little bit of reorganizing of my codebase.

In any case, this is probably still not the faucet, because it's just 0.01 BTC and the faucet still gives out 0.05 BTC as far as I know.

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April 21, 2011, 02:59:37 AM
 #69

Add a delay to the payout which is a function of the number of payouts in the last hour. Set it to not kick in unless payouts are much more frequent than usual.
+1  !

I second this idea.  Much less of an incentive to game the system then.

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bourgis
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May 29, 2011, 09:53:51 PM
 #70

I think I found some other anomalies at Bitcoin Monitor earlier today (May 29th). Look at around 20:00 UTC and 21:00 UTC. There are a lot of transactions at exactly a few seconds after every whole hour. Is this normal? Also at 20:45 UTC there seem to be an unusual long time between new block creations?

/Bourgis


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