Key management & binding keys to identities is one of the hard problems in cryptography.
Cryptocurrency and friends really have no bearing on the problem. The known solutions are the same as they always were - web of trust, pki, tofu, pre-shared keys, or just give up and ignore the outside world. All have tradeoffs and are very far from satisfactory.
If you take a subpar solution and wrap it in 10 layers of cryptocurrency and magical thinking, you are just left with a complex version of the same subpar solution.
Cryptocurrency and friends really have no bearing on the problem. The known solutions are the same as they always were - web of trust, pki, tofu, pre-shared keys, or just give up and ignore the outside world. All have tradeoffs and are very far from satisfactory.
If you take a subpar solution and wrap it in 10 layers of cryptocurrency and magical thinking, you are just left with a complex version of the same subpar solution.