Satoshi Nakamoto’s original white paper laying out the Bitcoin (BTC) network is seemingly hiding within every modern version of the operating system for Apple’s Mac computers.

According to a blog post from technologist Andy Baio, a PDF of the Bitcoin white paper has apparently been shipped with every copy of macOS since Mojave in 2018.

Baio noted that he was just trying to fix his printer and scan a document with a wireless scanner when a device called “Virtual Scanner II” appeared that he’d never seen on his device before. By default, Virtual Scanner II showed a photo, but when Baio changed the media type from “Photo” to “Document,” Nakamoto’s white paper appeared.

In his post, Baio said there is virtually nothing about this online. He shared a November 2020 Twitter thread from designer Joshua Dickens, who also found the whitepaper, which Baio used to find the file location.

Baio explains that the way to access the document is to open Terminal and type a specific command:

In his blog post, Baio claimed the file is found on every version of macOS from Mojave (10.14.0) to the current version (Ventura), but isn’t in High Sierra (10.13) or earlier.

It’s unknown why Nakamoto’s white paper is shipped with modern versions of macOS. Baio speculated in his post that it was just a convenient, lightweight multipage PDF for testing purposes, never meant to be seen by end users.