AI Recreates Satoshi's Bitcoin Software, Matching Original Hash

A 17-year puzzle about Bitcoin's origins has been solved. Satoshi Nakamoto made the cryptocurrency's code public, yet no one could duplicate the precise Windows executable from 2009.

A developer has reportedly used artificial intelligence to crack it.

Using Anthropic's Claude Opus 5.5, the developer—going by the handle T4T5—rebuilt the exact computing environment Satoshi employed.

The outcome was striking. The reconstructed bitcoin.exe was an exact match: its SHA-256 hash and every byte were identical to the original.

How Artificial Intelligence Revealed Satoshi's Build Process

The challenge turned out to be unexpectedly complex.

Bitcoin's initial release was not built to be reproducible. Variations in the compiler, library versions, or even line endings could alter the resulting file.

T4T5 needed to recreate a full development setup, relying on software packages dating from 2006 through 2008.

Details about Satoshi's work practices are now visible in the GitHub repository.

Satoshi appears to have run Windows XP with MinGW GCC 3.4.5. Most of Bitcoin was compiled in debug mode, but the hashing code for mining was optimized to the maximum.

He also updated a portion of his toolchain partway through the project.

The probe revealed an even more unexpected finding.

Does the Original 2009 Bitcoin Software Still Remain Lost?

The file commonly referred to as Bitcoin 0.1.0 is actually version 0.1.1, built on January 10, 2009, at 23:16 UTC.

That date is two days after Bitcoin was publicly announced.

No authenticated copy of the original January 8 launch executable is known to exist.

The reconstruction strongly indicates that the preserved 2009 software aligns with Satoshi's published source code, containing no hidden, unexplained code.

The direct security impact is negligible. However, the finding provides Bitcoin historians with a valuable asset: a verifiable record of how the early software was constructed.

Even as artificial intelligence aids research into Bitcoin's origins, the original launch-day executable is still absent.

The hunt for Bitcoin's first executable is ongoing.