I'd be in for #3
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Everyone else has the choice to annoy ezeminer to try to get this hint.
Nice find, that's something we're actively working on. The development costs may exceed 0.1 BTC to get this capability in-house. Proceeds of this mystery note will make this possible.
The inks used to make this UV effect are generally restricted for obvious reasons. Mystery notes are a form of R&D for us. The learning process and project funding happens through these notes.