The Sign Under Test: Revelation 12 Against the Frozen Operator is a philological test report executing the pre-registered protocol of The Transform Signature, Frozen. Revelation 12 is scored in Greek against the twelve-clause Sappho 31 reception operator, with a declared biblical source-set (Genesis 37, Micah 4, Isaiah 26:17 and 66:7–9, Psalm 2, Daniel 7) adjudicated verbatim and a scoring rule fixed before adjudication. Eight of nine stations pass with a direction-sum of twelve. The doubled station is occlusion-as-gate: Revelation 12:5's ἔτεκεν υἱόν ἄρρενα imports Isaiah 66:7's ἔτεκεν ἄρσεν, establishing the source under the author's hand, and against that verse's explicit painless birth Revelation writes βασανιζομένη τεκεῖν — the torment reinserted into the verse that removed it. One station fails outright: the apocalyptic seeing-frame is covered by Genesis and Daniel and the correlative instantaneity marker is absent. Reported negatives include the birth-cry, fully covered by Isaiah 26:17, and the absence of the fire-lexeme at reactivation. Clean post-freeze findings include the accuser exercising the voice-channel day and night in the facing position, the soul-station's polarity flip against the Esther realization, the shedding profile matching the Judaic-prose carrier, and collapse inverted to flight on given wings. The verdict is held to the pre-registered ladder; the identification sentence is deliberately not asserted, and substrate-blind replication of the scoring is invited.