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A comment on Walmart Requires Lettuce, Spinach Suppliers to Join Blockchain. Parent comment

Re:Walmart Requires Lettuce, Spinach Suppliers to Join Block... by rocqua on Wednesday September 26, 2018 @09:26AM (#18075648)
You can replace PoW by a simple signatures, or a quorum of signatures. This is quite centralized, but still write-once.

In any case, with a 'hash-linked-chain-of-blocks' attempted forks are really easy to prove.

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Re:Walmart Requires Lettuce, Spinach Suppliers to Join Block... by ruiquelhas on Tuesday October 02, 2018 @10:18AM (#18121903)
I get that, but there are no guarantees it is write-once, because it might happen that the "quorum of signatures" changes their mind.
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