I was wondering if anyone has a minimalistic, C++ (can also be C, or any other lang, as long as it's minimalistic but complete) Implementation of the original bitcoin protocol, and by "the original bitcoin protocol" I mean just the most basic features, legacy addresses and maybe basic multisig functionality only, only what is necessary to form a working bitcoin chain.

I searched for it for sometime in github with no luck. any implementation i find is either something like btcd, with more advanced non-minimalistic features or a miniature blockchain.