How does signature validation work

Now some answers for the crypto geeks: How do CVNs know who should have what key? The list of CVNs is actually embedded in the blockchain. For each one you have its ID and its public key (see the CVN payload blocks and browse to the earliest one). A CVN just happen to have the private key corresponding to its ID. Both pieces of information are embedded in the FASITO. Private keys are generated on the FASITO and are not retrievable.