Koberstein

This plugin adds an option under ‘General Settings’ for you to put your donation Bitcoin address. It places this address in hidden meta tags in the head section of your site. This allows your site’s Bitcoin address to be detected by browser extensions that allow visitors to make donations or microtips to your website.

Bitcoin Meta Tags

Pronamic

Remco Tolsma

<a href="https://www.pronamic.eu/" rel="nofollow ugc">Pronamic</a> · <a href="https://github.com/pronamic/wp-pronamic-client" rel="nofollow ugc">GitHub</a>
The Pronamic Client plugin is a handy plugin for all WordPress users who use plugins or themes developed by Pronamic.

Bitcoin Meta Tags vs Pronamic Client