It would be so cool if I could just send you a private memo and give you the key so you could unencrypt my private details about any case matters we could use this all on the blockchain without needing cell phones or any utilities provided by the state.
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You can already send encrypted memos on Hive. You can also post encrypted data to the blockchain. So this is already doable.
Zcash would allow for a higher level of privacy with the sheilded addresses.