[whatisweb3]

Application-level protocols should not be attempting to secure their own consensus mechanisms - it ties the security of the application to the base token.

If you are seeking decentralized naming and certificate authorities you can look at Ethereum and ENS. Besides the eventual transition to Proof-of-Stake, building an application on top of an existing consensus mechanism means that your application will inherit the security of that blockchain.

[easrng]

It's not possible to make a lightweight ENS resolver that doesn't fully trust the Ethereum node it's using.

[whatisweb3]

True, even though a current "light client" can run on Raspberry Pi, really there should be even lighter clients for validating on-chain state. See [1] which is an area of development.

[1] https://nimbus.team/docs/fluffy.html