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No More Blob Captcha, Interested?

No More Blob Captcha, Interested?

Following on from last months investigation in to the ‘blob’ captcha we have continued to look at ways we can improve out OCR success. Through more testing we have been able to both pretty much work out what’s going on, and find a solution to it. In fact we are now running almost totally blob free and as such our MegaOCR solve rate is up there at 85-90% (It is actually 91% as I type this).

There appear to be two things going on:

  1. If you send a lot of bad answers your IP gets flagged much faster than before
  2. If your IP is from a datacenter and not an ISP it gets flagged even quicker

We have configured our system to specifically identity re-captcha and re-route that request through tens of thousands of different semi-private proxies, other traffic continues to go through our regular proxies.

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Pobman

P.S. This method has only been tested as working with SEnuke. Whilst we have tried we have so far been unable to get it working properly with other popular SEO link building software.

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