{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:DQY7TUBY2P52Q4NF3LVIDTKNJ5","short_pith_number":"pith:DQY7TUBY","canonical_record":{"source":{"id":"1805.07553","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-05-19T09:15:47Z","cross_cats_sorted":[],"title_canon_sha256":"89da62cd508322bb92c56fe2f64c1d7d2d39d45a1e764a2e5a4a2df888fc53ad","abstract_canon_sha256":"1a5d69e173ebb4e7fd83c78b013f8075b97b41fb969ed2bfd427bece304083fe"},"schema_version":"1.0"},"canonical_sha256":"1c31f9d038d3fba871a5daea81cd4d4f75aa90f5f73d967a8691471ac0a90884","source":{"kind":"arxiv","id":"1805.07553","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.07553","created_at":"2026-05-18T00:15:33Z"},{"alias_kind":"arxiv_version","alias_value":"1805.07553v1","created_at":"2026-05-18T00:15:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.07553","created_at":"2026-05-18T00:15:33Z"},{"alias_kind":"pith_short_12","alias_value":"DQY7TUBY2P52","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"DQY7TUBY2P52Q4NF","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"DQY7TUBY","created_at":"2026-05-18T12:32:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:DQY7TUBY2P52Q4NF3LVIDTKNJ5","target":"record","payload":{"canonical_record":{"source":{"id":"1805.07553","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-05-19T09:15:47Z","cross_cats_sorted":[],"title_canon_sha256":"89da62cd508322bb92c56fe2f64c1d7d2d39d45a1e764a2e5a4a2df888fc53ad","abstract_canon_sha256":"1a5d69e173ebb4e7fd83c78b013f8075b97b41fb969ed2bfd427bece304083fe"},"schema_version":"1.0"},"canonical_sha256":"1c31f9d038d3fba871a5daea81cd4d4f75aa90f5f73d967a8691471ac0a90884","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:15:33.269765Z","signature_b64":"HLMh51YMjs1vt6kdETNA27o26BaNroNvp7nOe4wSmbG/LUFzIiCesbePnK35cCwW/JHNyHriioO0kitiYIzpBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1c31f9d038d3fba871a5daea81cd4d4f75aa90f5f73d967a8691471ac0a90884","last_reissued_at":"2026-05-18T00:15:33.269188Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:15:33.269188Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.07553","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":"2026-05-18T00:15:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nf2ByXNG3wyS1nGuNUXy7Wx05PyTHyWT5vkNcoX+5y6MZk5WP9gaaP/oJvs+XYVEBDz1JygJuQSep0fRfyeHCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T07:39:46.953631Z"},"content_sha256":"a24465a921c24cb961f3a5d67deffb2d005a7fc2ecff957ac914016e90f4d8c6","schema_version":"1.0","event_id":"sha256:a24465a921c24cb961f3a5d67deffb2d005a7fc2ecff957ac914016e90f4d8c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:DQY7TUBY2P52Q4NF3LVIDTKNJ5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Improved spot formation for flexible multi-mode fiber endoscope using partial reflector","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Cory Rewcastle, Elaine Chou, Joseph M. Kahn, Ofer Levi, Ruo Yu Gu","submitted_at":"2018-05-19T09:15:47Z","abstract_excerpt":"Multi-mode fiber (MMF) endoscopes are a new type of endoscope that use only a single optical fiber to transmit images, achieving much higher spatial resolution for a given diameter than commercial fiber bundle endoscopes. However, a drawback of MMF endoscopes is that imaging quality degrades substantially as the MMF is perturbed. We propose a method for improving spot formation at the distal end of a perturbed MMF, and thus improving imaging quality, by attaching a partial reflector to the distal end of the MMF. We experimentally find that the perturbation of the light reflected from the parti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.07553","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":"2026-05-18T00:15:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NjEEuuLdc8fIHLqI17TyLlYxxehTbn7glNnk6u80xC8vNa0jQeAczDQXQkyQDCiVNY1r9T+5yf2eeJwqNDSrBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T07:39:46.954091Z"},"content_sha256":"e7e1e80f5e496e00d157b3fe0407c662c8b8eb60f139d8438716336e71f593b1","schema_version":"1.0","event_id":"sha256:e7e1e80f5e496e00d157b3fe0407c662c8b8eb60f139d8438716336e71f593b1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DQY7TUBY2P52Q4NF3LVIDTKNJ5/bundle.json","state_url":"https://pith.science/pith/DQY7TUBY2P52Q4NF3LVIDTKNJ5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DQY7TUBY2P52Q4NF3LVIDTKNJ5/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":"2026-06-25T07:39:46Z","links":{"resolver":"https://pith.science/pith/DQY7TUBY2P52Q4NF3LVIDTKNJ5","bundle":"https://pith.science/pith/DQY7TUBY2P52Q4NF3LVIDTKNJ5/bundle.json","state":"https://pith.science/pith/DQY7TUBY2P52Q4NF3LVIDTKNJ5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DQY7TUBY2P52Q4NF3LVIDTKNJ5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:DQY7TUBY2P52Q4NF3LVIDTKNJ5","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":"1a5d69e173ebb4e7fd83c78b013f8075b97b41fb969ed2bfd427bece304083fe","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-05-19T09:15:47Z","title_canon_sha256":"89da62cd508322bb92c56fe2f64c1d7d2d39d45a1e764a2e5a4a2df888fc53ad"},"schema_version":"1.0","source":{"id":"1805.07553","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.07553","created_at":"2026-05-18T00:15:33Z"},{"alias_kind":"arxiv_version","alias_value":"1805.07553v1","created_at":"2026-05-18T00:15:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.07553","created_at":"2026-05-18T00:15:33Z"},{"alias_kind":"pith_short_12","alias_value":"DQY7TUBY2P52","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"DQY7TUBY2P52Q4NF","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"DQY7TUBY","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:e7e1e80f5e496e00d157b3fe0407c662c8b8eb60f139d8438716336e71f593b1","target":"graph","created_at":"2026-05-18T00:15:33Z","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":"Multi-mode fiber (MMF) endoscopes are a new type of endoscope that use only a single optical fiber to transmit images, achieving much higher spatial resolution for a given diameter than commercial fiber bundle endoscopes. However, a drawback of MMF endoscopes is that imaging quality degrades substantially as the MMF is perturbed. We propose a method for improving spot formation at the distal end of a perturbed MMF, and thus improving imaging quality, by attaching a partial reflector to the distal end of the MMF. We experimentally find that the perturbation of the light reflected from the parti","authors_text":"Cory Rewcastle, Elaine Chou, Joseph M. Kahn, Ofer Levi, Ruo Yu Gu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-05-19T09:15:47Z","title":"Improved spot formation for flexible multi-mode fiber endoscope using partial reflector"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.07553","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:a24465a921c24cb961f3a5d67deffb2d005a7fc2ecff957ac914016e90f4d8c6","target":"record","created_at":"2026-05-18T00:15:33Z","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":"1a5d69e173ebb4e7fd83c78b013f8075b97b41fb969ed2bfd427bece304083fe","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-05-19T09:15:47Z","title_canon_sha256":"89da62cd508322bb92c56fe2f64c1d7d2d39d45a1e764a2e5a4a2df888fc53ad"},"schema_version":"1.0","source":{"id":"1805.07553","kind":"arxiv","version":1}},"canonical_sha256":"1c31f9d038d3fba871a5daea81cd4d4f75aa90f5f73d967a8691471ac0a90884","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1c31f9d038d3fba871a5daea81cd4d4f75aa90f5f73d967a8691471ac0a90884","first_computed_at":"2026-05-18T00:15:33.269188Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:15:33.269188Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HLMh51YMjs1vt6kdETNA27o26BaNroNvp7nOe4wSmbG/LUFzIiCesbePnK35cCwW/JHNyHriioO0kitiYIzpBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:15:33.269765Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.07553","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a24465a921c24cb961f3a5d67deffb2d005a7fc2ecff957ac914016e90f4d8c6","sha256:e7e1e80f5e496e00d157b3fe0407c662c8b8eb60f139d8438716336e71f593b1"],"state_sha256":"d96c11c4d4d77b2067115d051972d822f51edb602854804ac5e5063227333cba"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0j6TftHmtRIbh3XjIaMMErUqfbFWb6WF5jsbg0Mg/XKsqdg0j7g57pXhzTt2qNfZ5dXyYfiXbFU1w6P4MnAnBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-25T07:39:46.956564Z","bundle_sha256":"b693a4e28567fc6b4b9f5ea7cfdb0a8eacbe3f0104c39f3b42c4de9a0e279c24"}}