Proof of Person is the problem we most need to solve.
A means to cryptographically assert in a privacy-preserving way "a human being generated this"; or less privacy-preserving, "human being X generated this".
To do either in a distributed fashion would perhaps involve peer-to-peer attestations of human-ness, published as a "web of trust" in a distributed database. But any anonymity/pseudonymity would be easily broken if done naively.
Of course, "human being X generated this" is something that would be easily facilitated by governments, with certificates issued to each citizen/national. Americans can only dream of this happening at the federal level---states will have to be where the action's at.
Proof of personhood doesn't really help that much, when you can hire thousands of real people to click on things and generate fake content all day.
If doing online action X makes $0.01, there will always exist someone willing to have 10,000 people to sit there doing X 10,000 times a day or a week, generating $1M in revenue (check my math). Figure out what to pay those 10,000 people and the rest is profit.
Sorry but what is to stop actual humans from signing bot generated or false content using their private keys? It also creates incentives to steal other keys. What will happen if your private keys get stolen and they start being abused by someone else?
This sounds overtly Orwellian mixed with a PKI disaster.
A means to cryptographically assert in a privacy-preserving way "a human being generated this"; or less privacy-preserving, "human being X generated this".
To do either in a distributed fashion would perhaps involve peer-to-peer attestations of human-ness, published as a "web of trust" in a distributed database. But any anonymity/pseudonymity would be easily broken if done naively.
Of course, "human being X generated this" is something that would be easily facilitated by governments, with certificates issued to each citizen/national. Americans can only dream of this happening at the federal level---states will have to be where the action's at.