Eliminating Captcha's w/ Bitcoin

[Mike Hearn]

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

[1715603441]

1715603441

[thezerg]

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...

[kokojie]

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.

[thezerg]

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]

I think the bitcoin passport/fidelity bond ideas are the best CAPTCHA alternative yet proposed.

[TTBit]

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.