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A comment on Sweden’s central bank says it has begun testing an e-krona. Parent comment

Re:Sweden’s central bank says it has begun testing an e-krona by volgar1x on Thursday February 20, 2020 @12:38PM (#22376818)
Without proof of work
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Re:Sweden’s central bank says it has begun testing an e-krona by azov on Thursday February 20, 2020 @01:19PM (#22377210)
The term you’re looking for is “Merkle tree”. Git and Bitcoin are both Merkle trees.
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Re:Sweden’s central bank says it has begun testing an e-krona by gruez on Thursday February 20, 2020 @01:32PM (#22377330)
having proof of work or not is orthogonal to whether it's a blockchain or not. see: blockchains for proof of stake cryptocurrencies.
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Re:Sweden’s central bank says it has begun testing an e-krona by bronipstid on Sunday February 23, 2020 @12:52AM (#22395372)
I think a lot of non-technical business people and journos didn't fully understand that the Bitcoin blockchain is more than just a Merkel tree, and so have started using "blockchain" to mean a bare MT, despite the fact that the blockchain in Bitcoin is only meaningful because of how it's computed.

So maybe proof of work can be replaced, but without some consensus protocol it's not a blockchain in any meaningful sense.

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Re:Sweden’s central bank says it has begun testing an e-krona by kragen on Sunday February 23, 2020 @01:01AM (#22395402)
"Merkle graph" may be a better term, since both Git and Bitcoin may have multiple hash references to the same node [in some sense].

I pretty much agree that "some consensus protocol" is probably the right place to draw the line. I'd add "decentralized", in the sense that no single entity can control the "consensus", which I think may be what you mean: "some decentralized consensus protocol".

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