The existence of PoA chains, which have existed for many years, does not disprove my point about the special security of blockchains - those chains lack it, the

The existence of PoA chains, which have existed for many years, does not disprove my point about the special security of blockchains - those chains lack it, they rely on trust and are fundamentally closed. The special security I refer to is a system which anyone can participate in which has objective and significant costs for revision.