Tatsuaki Okamoto or the 1996 NSA paper “How To Make A Mint: The Cryptography of Anonymous Electronic Cash”

Some see it as a pretty standard proposal for electronic cash others like the definite proof that Bitcoin is a NSA job.

With the onset of the Information Age, our nation is becoming increasingly dependent upon network communications. Computer-based technology is significantly impacting our ability to access, store, and distribute information. Among the most important uses of this technology is electronic commerce: performing financial transactions via electronic information exchanged over telecommunications lines. A key requirement for electronic commerce is the development of secure and efficient electronic payment systems.

HOW TO MAKE A MINT: THE CRYPTOGRAPHY OF ANONYMOUS ELECTRONIC CASH 1996

But NSA is definitely involved with Bitcoin, you can say, until its core. SHA-256 is an NSA hash function algorithm first published in 2001.