[geekpowa]

That depends on how you define "Blockchain".

My definition of "blockchain" is a distributed ledger in a entirely trustless p2p network. To which PoW is the most widely deployed mechanism in use to secure against the double spend problem. Pow being a mechanism that remains un-superseded inspite of significant efforts to do so. All this making PoW hardly orthogonal.

Of course this definition of a "blockchain" can be loosened. One of two tweaks and suddenly we need to label prosaic everyday items such as a git repos as "blockchains".

At which point it becomes difficult to even have conversation about "blockchains" since our industry has yet to bring to bear a sufficient amount of focus to even define the term with any sort of useful precision.

[specialist]

"That depends on how you define "Blockchain"."

https://en.wikipedia.org/wiki/Blockchain