Divinity can cheat and change answer

[spalladino]

The divinity can choose to not reveal its previous answer from its oracle, allowing them to change the answer. I believe this may be fixed once you migrate to an ImmutableSingleton (as described in a TODO), since what you want to do is emit a nullifier (that depends only on the question) when you answer it.

aztec-private-oracle/src/main.nr

Lines 154 to 160 in afe8cb4

	// Check if this question was previously answered
	let answerFilter = NoteGetterOptions::new()
	.select(0, question)
	.set_limit(1);
	let answerNote = storage.answers.get_notes(answerFilter)[0].unwrap_unchecked();