Description
This plugin allows you to stamp the contents of your posts to the blockchain. Protect the authenticity of your original work by timestamping the unique identifier (SHA256 hash) of each posts’s content.
Using this plugin you can stamp your posts and add a custom signature with the resulting hash and transaction ID.
Learn more about it and how it works: https://stampd.io/#/about
It requires that you have an account in stampd.io. Visit this URL to register: https://stampd.io/#/register
Screenshots
Stampd.io plugin settings 
Stampd.io blockchain stamping metabox displays the current sha256 hash of the content after every save 
After a post has been stamped, changes will invalidate the stamping. In this case the post needs to be stamped again or returned to the previous revision 
Custom signature displayed below each stamped post
FAQ
Read our FAQ here: https://stampd.io/#/faq
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Contributors & Developers
“STAMPD.IO – Blockchain Stamping” is open source software. The following people have contributed to this plugin.
Contributors
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Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
Initial submission
Updated for use with Guttenberg blocks
Minor JS fix
Updates to UI
Post content fix
Minor corrections for WP 6