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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 parti
by 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 agoThe public key still needs to be shared.
- bouncycastle 7y agoOf 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)