The Bitcoin white paper has been discovered hidden deep inside Apple’s system files for machines running macOS Catalina or later.

Labeled as “simpledoc.pdf” the file appears to showcase Satoshi Nakamoto’s vision for decentralized cash, based on a public ledger, in all its nine pages of glory.

The subtle nod to the world’s oldest blockchain — on the day of Nakamoto’s 48th birthday — was first reported by an independent blogger, Andy Baio, on his Waxy blog.