BitcoinCAPTCHA - Free Bitcoin CAPtCHA Tool - page 2.

Killdozer

full member

Activity: 203

Merit: 100

Quote

Technically there is nothing preventing someone from doing this but OCR could be used to defeat text CAPTCHA as well. With BitcoinCAPTCHA it will cost them more to bypass your CAPTCHA screen, adding a monetary deterrent.

Only the monetary deterrent is the issue here. (Arguably whether it is good.)
OCR is much harder to do than scan barcodes, which are basically engineered to be scanned very easily.

TTBit

legendary

Activity: 1137

Merit: 1001

Nice implementation!

When creating LBAAT.net, I suggested something similar - you send coins to yourself, but in the future. The card provided would have the user's public key, and send coins to an address that won't be revealed until tomorrow, next week, etc.

bittenbob

hero member

Activity: 560

Merit: 500

Technically there is nothing preventing someone from doing this but OCR could be used to defeat text CAPTCHA as well. With BitcoinCAPTCHA it will cost them more to bypass your CAPTCHA screen, adding a monetary deterrent.

Quote from: zoinky on December 23, 2012, 12:19:09 PM

Cool idea but what stops a tool from reading the QR code and sending a payment? :O

hazek

legendary

Activity: 1078

Merit: 1003

Quote from: zoinky on December 23, 2012, 12:19:09 PM

Cool idea but what stops a tool from reading the QR code and sending a payment? :O

That's not the point. The point is to make each attempt cost a bit of wealth which is basically meaningless to an actual user but which will add up to being very expensive for someone who wants to use a bot.

This was a long time coming and I'm very happy someone put the work into it and made it happen!

zoinky

hero member

Activity: 811

Merit: 1000

Web Developer

Cool idea but what stops a tool from reading the QR code and sending a payment? :O

bittenbob

hero member

Activity: 560

Merit: 500

WalletBit is pleased to give the Bitcoin community BitcoinCAPTCHA. This is a new method of ensuring users filling out forms are real people using Bitcoin. There is no charge for using the service and the BitcoinCAPTCHA can be fully customized.

BitcoinCAPTCHA replaces the standard CAPTCHA with a QR code where any amount of Bitcoins must be sent. It is also URI wallet compatible, providing effortless payments from someone logged into a URI wallet service. Simple instructions on how to use BitcoinCAPTCHA are included, along with source code and a template for your own custom CSS.

https://bitcoincaptcha.com/

Topic: BitcoinCAPTCHA - Free Bitcoin CAPtCHA Tool - page 2. (Read 4912 times)