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Author Topic: Eliminating Captcha's w/ Bitcoin  (Read 4994 times)
Mike Hearn
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July 01, 2012, 05:03:45 PM
 #41

See here for a description of how to use Bitcoin deposits to replace CAPTCHAs in a low trust way:

https://en.bitcoin.it/wiki/Contracts#Example_1:_Providing_a_deposit
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March 27, 2013, 01:56:41 PM
 #42

Necroing this thread because with bitcoins' growth in popularity this may start becoming relevant.

Also, its not just about captchas... news sites are increasingly requiring login even to +1 or flag a comment; this is a serious PITA!  I'm guessing that's because of spammers as well.


I wonder if you would really need to send a txn.  Imagine a browser plugin that simply signs a message containing the browser's IP address from a bitcoin address that has held X coins for N days (X,N limits can be chosen by each website).  This would limit spammers to relatively few accounts and IP addresses.  These could rapidly be identified, either because there are a lot of IP addresses using the same bitcoin address (spam botnets) or simply by downvotes.

Of course just like with today's captchas a web service is providing this so end sites don't have to worry about bitcoin.  And is gathering spammer data across all sites...

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March 27, 2013, 01:59:54 PM
 #43


I had no idea about this stuff. So your basically saying there are services that have human beings breaking captcha's and people pay for them ? lol

Roughly 80% is still done by specialized scripts developed by the de-captcha service operator, then the 20% that script can not break gets sent to humans in Thailand/Philippines or something, and gets manually broken.

If my post has been helpful, send me some love -> BTC: 1kokojUapmWqCqPw3Ch2rjcVh57tJEzka | PPC: PDyXAgA8eH47gokVW6zVZPSuu15aao5nZF | Bitshares: kokojie
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thezerg
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March 27, 2013, 02:20:02 PM
 #44


I had no idea about this stuff. So your basically saying there are services that have human beings breaking captcha's and people pay for them ? lol

Roughly 80% is still done by specialized scripts developed by the de-captcha service operator, then the 20% that script can not break gets sent to humans in Thailand/Philippines or something, and gets manually broken.

Can your script (or human) crack my proposal?
Mike Hearn
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March 27, 2013, 03:26:46 PM
 #45

I think the bitcoin passport/fidelity bond ideas are the best CAPTCHA alternative yet proposed.
TTBit
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March 27, 2013, 03:48:59 PM
 #46


This is one use for LBAAT.net. You require a user to send bitcoins to themselves in the future. It is provable that the coins are locked up, and allow access.

good judgment comes from experience, and experience comes from bad judgment
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