How to implement a decentralised CA based on blockchain?


I found one proposal is “We propose splitting a CA’s private key among multiple parties, and producing signatures using a generic secure multi-party computation protocol that never exposes the actual signing key.”

The proposal is based on MPC.
Is there any possible solution which can be implemented with smart contract?


For clarity, I suggest you state the acronym in full. CA = Chartered Accountant? MPC = Multi-party computation?


CA = Certificate Authority
MPC = Multi Party Computation