Very cool. So, effectively this is a "blockchain" that requires confirmation by the receiver before a block can be added, which allows hiding data that might normally be required on a public ledger? If this paper is to be believed, it would be possible to hide basically everything.
Is this idea completely novel, or are there already systems that implement a protocol like this?
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I'm not sure, but Mina Protocol might be using something quite similar. https://minaprotocol.com
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interesting
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