The fundamental innovation of the bitcoin protocol is how it made the blockchain, a traditionally centralized data structure invented in the early 1990s, a distributed append-only database using PoW consensus. It's incredibly inefficient, its unimaginable inefficiency is there to buy trust in a trustless peer-to-peer network. You're basically forcing every writer to cut down a pound of their own computational flesh to write to the database. How can this be necessary or useful in a trusted setting? why can you not rely on trust or traditional register-and-authenticate to write to the database?
You're either using PoW consensus or you're not. If you're, you're not a central authority (unless the blockchain is somehow not an authoritative state and you're simply using it as a fancy bulletin board), if you're not, then whatever you're doing is different from what everbody else have been calling 'blockchain' since 13 years and you're just inviting confusion by calling it that.