4 ms·

What is the proof? That the domain owner signed it with a certain key? Is that key shared out-of-band? If so why do we even need the blockchain?

• bouncycastle 7y ago
  Yes, the proof would be some sort of signature. No, public key cryptography means that the key doesn't need to be shared. A blockchain is only needed if parties need to write to the database in a decentralized manner, and the order of the writes is important & can't be tampered with.
  • SAI_Peregrinus 7y ago
    The public key still needs to be shared.
    • bouncycastle 7y ago
      Of course. The OP didn't mention which key, so assumed they are talking about the private key, especially when they mentioned out-of-bound sharing, usually terminology used for asymmetric cryptography. Public keys don't need to be shared out-of-band, in fact they are always published along with the transaction on the blockchain. (well technically, only the curve points and the hash are, but using these, we can re-create the public key)