[acdha]

Why wouldn’t you use traditional PKI for that? Ultimately it comes down to trusting a known authority and tamper-evidence could be provided at orders of magnitude less cost and greater reliability by either using a Merkle tree or notarization from a third-party.

As for the cynicism, note that this is an audience with deep technical knowledge and the ability to reason about systems, years into salespeople making big claims which have not been delivered. Given the conflicts of interest inherent to a system which requires outsiders to put fresh money in before insiders can cash out, skepticism seems warranted.