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We present ARCHANGEL; a novel distributed ledger based system for assuring the long-term integrity of digital video archives. First, we describe a novel deep network architecture for computing compact temporal content hashes (TCHs) from audio-visual streams with durations of minutes or hours. Our TCHs are sensitive to accidental or malicious content modification (tampering) but invariant to the codec used to encode the video. This is necessary due to the curatorial requirement for archives todoi:10.1109/cvprw.2019.00338 dblp:conf/cvpr/BuiCCB0SHDKTB19 fatcat:4yzbrchmmzcbroknhmgf6f6gmm