The first example of blockchain protocol was invented by a person or persons going by the name of Satoshi Nakamoto. The purpose of the original protocol was to power Bitcoin, the world’s first cryptocurrency.
For reasons known only to him, her or them, the inventor(s) of blockchain chose to remain anonymous, publishing the original protocol under a pseudonym on a public forum and collaborating with a small group of other interested parties on improving the early versions of the protocol while still not revealing his, her or their identity. Nakamoto last communicated with the early Bitcoin group in 2011, and has not been heard from since.
While there has been much speculation on who Satoshi Nakamoto really is, to this date the identity is still unknown.