I've written up a new gist here describing a use case for OP_CHECKDATASIG.
https://gist.github.com/markblundeberg/bd28871548108fc66d958018b1bde085
The idea is that you could make a BCH transaction pays to someone by name (or other identifier), rather than paying to a specific cryptographic key that they own. They don't even need to have a BCH wallet yet. The funds are not held in any custodial account.
Thanks to u/jtoomim for sparking off this idea and a generous donation.
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source https://www.reddit.com/r/btc/comments/9do3y9/pay_to_identity_a_proposed_use_of_op_checkdatasig/
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