The version 0.1 codebase created by Satoshi Nakamoto was believed to be lost for well over ten years. It's very tough to find if one searches, yet some people have managed to decipher little portions of the code.
On October 7, Bitcoiner Jim Blasko revealed via a Facebook post that he had managed to recover the long-lost code by employing a little browser hacking. After briefly describing the background, Blasko outlined how long it took the founder of Bitcoin to mine his 1 million BTC hoard.
The secret code that Martti Malmi, alias SIRIUS, posted on August 30, 2009, can be accessed thanks to Blasko's discovery. The discovery made by Blasko is special since it is the original, unaltered Bitcoin codebase and includes all of Satoshi's personal annotations.
The codebase for Bitcoin version 0.1 is available in previous and current versions on Github, according to Blasko, but he still considers it to be "the cleanest original version of Bitcoin."
Nakamoto provides explanations for decisions like why base-58 was chosen over base-64 encoding conventions as well as other notations for things the creator planned "to do" in the future. The original Bitcoin operations codes (opcodes) and what each one accomplishes are also very well described. OP_CHECKSIG, OP_CHECKSIGVERIFY, OP_CHECKMULTISIG, and OP_CHECKMULTISIGVERIFY are examples of opcodes.
