Hi Malcolm, thank for the follow-up. My understanding of blockchain ledgers is that the integrity of the ledger is paramount. This is one reason why the ledger is encrypted and widely distributed. This protects the integrity of the ledger and also makes non-repudiation non-trivial (a certain number of nodes have to agree).

Perhaps private Webmentions -- something that I did not know existed until I read your post, "credentials: a distributed ledger for the #indieweb" -- can help but ... I guess I'm concerned that a "one-and-only-copy" ledger system is prone to attack, and the fact that Webmentions can be deleted may compromise "trust".

I think the idea is worth exploring but the design (putting on my security systems development lifecycle hat) needs more thinking on the "information security" aspect.