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Specify how to record on-chain which UA an output was sent to
Suppose we send to a UA and then lose wallet state, and need to recover it from the chain. Currently only the actual protocol address we sent to is recoverable, not the UA. We could record the UA in the change output memo.
See also https://github.com/zcash/zcash/issues/5505, which is about saving this information when we do not lose wallet state.