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"Buckets" contain cryptographic trapdoors which are necessary to witness spendable value. The sender constructs them and encrypts them with an IND-CCA2-secure key and places it inside the transaction. Only the recipient should be able to decrypt it to obtain the trapdoors which it needs in order to spend it.

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I understand that. Well, I don't know what IND-CCA2 is. And presumably, therefore, my question. Does the 'spend' reveal the equivalent of a Bitcoin address? Or does the 'spend' merely provide a zero knowledge proof that the funding was legitimate?

> Or does the 'spend' merely provide a zero knowledge proof that the funding was legitimate?

This. :) (Alongside a demonstration that it wasn't spent before.)

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