This page details what signatures are and how to verify them.
Signatures are a way for readers to know that something is genuine and not written by a malicous third party. The public key is as follows:
1BayerNGeyWgdjq5DruQ4Mo5LoR1nHvxNE
Please remember that if this website can be tampered with, so can this key. Please also verify this key via internet archives and other means.
The public key is a bitcoin address. Signatures will always be of the SHA-256 of a file, never raw text to allow for fluidity in signing other files such as images, audio, and video.
There are multiple ways for you to verify signatures. Electrum is great cross-platform software for using bitcoin as well as verifying signatures, you can also use this open-source tool. Simply download the repository and open index.html.