Mid-Qīng (Kāng-xī-era) Buddhist-Daoist syncretic spirit-medium, sobriquet Gǔkǒu Zǐzhēn 谷口子真 (“Valley-Mouth Zǐzhēn”) and Zǐzhēn dàxiān 子真大仙 (“Great Immortal Zǐzhēn”). Lifedates unrecorded. DILA classifies him as 是 (a monk), but the title dàxiān and the jīshū (spirit-writing planchette) practice place him in a Daoist-Buddhist syncretic fújī 扶乩 community. Per the preface to KR6c0082 Jīngāng jīng zhùshì, on Kāngxī 60 / 2 / 19 = 1721-03-17 he invited the monk Yúnfēng 溥仁 to the xīnyì to open a Vajracchedikā teaching platform; over 40 days until Kāngxī 60 / 4 / 9 = 1721-05-04 the lectures were delivered, with Yúnfēng as jīshū (spirit-writing recorder) and Zǐzhēn as jīdìng (spirit-writing collator). The work that resulted — composed under the joint authority of medium and immortal — is a rare specimen of canonized planchette-mediated Buddhist sūtra commentary.