My idea its creation for government trusted CA for decenteralized trust to human public keys, like you pay money to some CA and transfer locally generated on your pc by open source software certificate request, and get signed cert for CA, CA sends your certificate to public registry of certificate transparency, this certificates registry provides to all humans information about created trusted ceritficates issuers and private key owners
Like if some government organization need send document for you, this organization sign this document using trusted key and encrypt this document for you, and sends over public networks
This idea better for centralized registy or website for documents exchange, like if some hacker hacks this website its be very VERY destruct for country security