PHP API client class library released at github.com [https://github.com/articlefr/captchacoin]

Cookies are an option to consider...

Never the less how it works is that website owners may have premium services or content and they want to accept bitcoins. They can use the captcha together with their registration or purchase pages. Once the user has paid they will just input their btc address used for payment and then they can have access when ever they want.

Welcome CaptchaCO.IN https://www.captchaco.in/

Bitcoin Wallet And Bitcoin Captcha System
Start earning with your site's content using bitcoin captchas!

INTRODUCTION

CaptchaCO.IN is a website that offers a premium and free Bitcoin wallet service. Aside from a free wallet service CaptchaCO.IN also offers a free pay captcha service.

WHAT IS A PAY CAPTCHA?

By the name itself a pay captcha is a type of captcha alternative that accepts payments from users. It secure's a page or content and even a service by placing a secured pay captcha widget anywhere you want it to appear in your page. A pay captcha is a service that is interactive and merchant enabled captcha solution.

STEPS TO GET STARTED AND INTEGRATE THE PAY CAPTCHA CODE

• Register or login a free account here CaptchaCO.IN.
• After login click on the "Integration" menu section in your dashboard.
• Enter your desired amount to accept.
• Copy the Pay Captcha code.
• Paste the code anywhere in your website.

STEP-BY-STEP GUIDE ON HOW CAPTCHACO.IN'S PAY CAPTCHA ACCEPTS BITCOINS

• Captcha.CO.IN pay captcha widget embeded and displayed in a web page.
• Payer sends Bitcoins to the specified CaptchaCO.IN pay captcha address.
• CaptchaCO.IN stores the payment and sender's address as 1 conversion.
• Payer clicks on "I HAVE ALREADY PAID" button.
• Payer enters his/her own Bitcoin address where she/he paid the captcha from.
• CaptchaCO.IN verifies the address.
• If address is valid captcha is set.
• User or payer continues to the page process.
• Website or page checks pay captcha's validation response.
• Done...

For more information check "How it Works?" https://www.captchaco.in/how_it_works.php

WordPress plugin available https://wordpress.org/plugins/wp-captchacoin-content-locker/