{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:5HXAAZKLXVQMUIFOEZRSKQYXY6","short_pith_number":"pith:5HXAAZKL","canonical_record":{"source":{"id":"1507.01314","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2015-07-06T01:04:39Z","cross_cats_sorted":["cs.HC"],"title_canon_sha256":"6235bfa93d8b9b5e368855f3af4f1ebfd0a745695ac724c50f095ad454dd047d","abstract_canon_sha256":"55a3367cec0e8ec545b25673d5a6a22bda5d93e5a81b2f7ebbe612a3cfba0dbb"},"schema_version":"1.0"},"canonical_sha256":"e9ee00654bbd60ca20ae2663254317c7a8f6fe0ac76a5f54fecf4f6071bd6f9f","source":{"kind":"arxiv","id":"1507.01314","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.01314","created_at":"2026-05-18T01:37:17Z"},{"alias_kind":"arxiv_version","alias_value":"1507.01314v1","created_at":"2026-05-18T01:37:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.01314","created_at":"2026-05-18T01:37:17Z"},{"alias_kind":"pith_short_12","alias_value":"5HXAAZKLXVQM","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"5HXAAZKLXVQMUIFO","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"5HXAAZKL","created_at":"2026-05-18T12:29:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:5HXAAZKLXVQMUIFOEZRSKQYXY6","target":"record","payload":{"canonical_record":{"source":{"id":"1507.01314","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2015-07-06T01:04:39Z","cross_cats_sorted":["cs.HC"],"title_canon_sha256":"6235bfa93d8b9b5e368855f3af4f1ebfd0a745695ac724c50f095ad454dd047d","abstract_canon_sha256":"55a3367cec0e8ec545b25673d5a6a22bda5d93e5a81b2f7ebbe612a3cfba0dbb"},"schema_version":"1.0"},"canonical_sha256":"e9ee00654bbd60ca20ae2663254317c7a8f6fe0ac76a5f54fecf4f6071bd6f9f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:17.369957Z","signature_b64":"wc+nIWNwvUoilyUOnoSfTkCDPeabe5MXIxa3P7K8RHB3IQ0WGZUfk/VIRq3jpWg2aSmHujMm8eBeG0etzn/ODg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e9ee00654bbd60ca20ae2663254317c7a8f6fe0ac76a5f54fecf4f6071bd6f9f","last_reissued_at":"2026-05-18T01:37:17.369166Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:17.369166Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.01314","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:37:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oG1oneTi9a9bjvDSDZtKEYkF3yz19b1bT3WKTSMa5I12smnB7qkAvxm4S0Pn2V7v2S3vjn+YTHpteXXJsjJuCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T08:43:15.896654Z"},"content_sha256":"3fd813732a7f2fe10d71f3528a8a3112c8205b77e83fe77a7a815392bc91cbb2","schema_version":"1.0","event_id":"sha256:3fd813732a7f2fe10d71f3528a8a3112c8205b77e83fe77a7a815392bc91cbb2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:5HXAAZKLXVQMUIFOEZRSKQYXY6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Mudslide: A Spatially Anchored Census of Student Confusion for Online Lecture Videos","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.HC"],"primary_cat":"cs.CY","authors_text":"Andr\\'es Monroy-Hern\\'andez, Elena L. Glassman, Juho Kim, Meredith Ringel Morris","submitted_at":"2015-07-06T01:04:39Z","abstract_excerpt":"Educators have developed an effective technique to get feedback after in-person lectures, called \"muddy card.\" Students are given time to reflect and write the \"muddiest\" (least clear) point on an index card, to hand in as they leave class. This practice of assigning end-of-lecture reflection tasks to generate explicit student feedback is well suited for adaptation to the challenge of supporting feedback in online video lectures. We describe the design and evaluation of Mudslide, a prototype system that translates the practice of muddy cards into the realm of online lecture videos. Based on an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.01314","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:37:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"scj7vrksKC4+LOoyVR3okGI0qXTmKkbFR/+6HIr6UutIrEG2+wr6wMH9oyzsIOAKlu0eTt1mf9UMuYf+5oLBAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T08:43:15.897016Z"},"content_sha256":"03eb91a0be1c2db7e0d644a118278ed9a1024ed517c92740f69a64333c894a01","schema_version":"1.0","event_id":"sha256:03eb91a0be1c2db7e0d644a118278ed9a1024ed517c92740f69a64333c894a01"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5HXAAZKLXVQMUIFOEZRSKQYXY6/bundle.json","state_url":"https://pith.science/pith/5HXAAZKLXVQMUIFOEZRSKQYXY6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5HXAAZKLXVQMUIFOEZRSKQYXY6/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-03T08:43:15Z","links":{"resolver":"https://pith.science/pith/5HXAAZKLXVQMUIFOEZRSKQYXY6","bundle":"https://pith.science/pith/5HXAAZKLXVQMUIFOEZRSKQYXY6/bundle.json","state":"https://pith.science/pith/5HXAAZKLXVQMUIFOEZRSKQYXY6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5HXAAZKLXVQMUIFOEZRSKQYXY6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:5HXAAZKLXVQMUIFOEZRSKQYXY6","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"55a3367cec0e8ec545b25673d5a6a22bda5d93e5a81b2f7ebbe612a3cfba0dbb","cross_cats_sorted":["cs.HC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2015-07-06T01:04:39Z","title_canon_sha256":"6235bfa93d8b9b5e368855f3af4f1ebfd0a745695ac724c50f095ad454dd047d"},"schema_version":"1.0","source":{"id":"1507.01314","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.01314","created_at":"2026-05-18T01:37:17Z"},{"alias_kind":"arxiv_version","alias_value":"1507.01314v1","created_at":"2026-05-18T01:37:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.01314","created_at":"2026-05-18T01:37:17Z"},{"alias_kind":"pith_short_12","alias_value":"5HXAAZKLXVQM","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"5HXAAZKLXVQMUIFO","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"5HXAAZKL","created_at":"2026-05-18T12:29:05Z"}],"graph_snapshots":[{"event_id":"sha256:03eb91a0be1c2db7e0d644a118278ed9a1024ed517c92740f69a64333c894a01","target":"graph","created_at":"2026-05-18T01:37:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Educators have developed an effective technique to get feedback after in-person lectures, called \"muddy card.\" Students are given time to reflect and write the \"muddiest\" (least clear) point on an index card, to hand in as they leave class. This practice of assigning end-of-lecture reflection tasks to generate explicit student feedback is well suited for adaptation to the challenge of supporting feedback in online video lectures. We describe the design and evaluation of Mudslide, a prototype system that translates the practice of muddy cards into the realm of online lecture videos. Based on an","authors_text":"Andr\\'es Monroy-Hern\\'andez, Elena L. Glassman, Juho Kim, Meredith Ringel Morris","cross_cats":["cs.HC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2015-07-06T01:04:39Z","title":"Mudslide: A Spatially Anchored Census of Student Confusion for Online Lecture Videos"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.01314","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:3fd813732a7f2fe10d71f3528a8a3112c8205b77e83fe77a7a815392bc91cbb2","target":"record","created_at":"2026-05-18T01:37:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"55a3367cec0e8ec545b25673d5a6a22bda5d93e5a81b2f7ebbe612a3cfba0dbb","cross_cats_sorted":["cs.HC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2015-07-06T01:04:39Z","title_canon_sha256":"6235bfa93d8b9b5e368855f3af4f1ebfd0a745695ac724c50f095ad454dd047d"},"schema_version":"1.0","source":{"id":"1507.01314","kind":"arxiv","version":1}},"canonical_sha256":"e9ee00654bbd60ca20ae2663254317c7a8f6fe0ac76a5f54fecf4f6071bd6f9f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e9ee00654bbd60ca20ae2663254317c7a8f6fe0ac76a5f54fecf4f6071bd6f9f","first_computed_at":"2026-05-18T01:37:17.369166Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:17.369166Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wc+nIWNwvUoilyUOnoSfTkCDPeabe5MXIxa3P7K8RHB3IQ0WGZUfk/VIRq3jpWg2aSmHujMm8eBeG0etzn/ODg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:17.369957Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.01314","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3fd813732a7f2fe10d71f3528a8a3112c8205b77e83fe77a7a815392bc91cbb2","sha256:03eb91a0be1c2db7e0d644a118278ed9a1024ed517c92740f69a64333c894a01"],"state_sha256":"56623c17b6c0446320378a55bd77cf88a7c81174e2e5da31b97a505604a7c0e4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9wA1ENIWwvGgwkAXy3HanBrYZHEF9jtyNc942BoLT5no9o5+OvgdZncZuS0KeuJ3QreBL6lu71Upp61IrIn0Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T08:43:15.899007Z","bundle_sha256":"40ec7f7baf1605ac6a6b2b0b8ffb8d4c47dc61ca0ed3e504dff44b6e5c096f94"}}