{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:Z5UDN4AJOJOLJRAODNLHMGDQXL","short_pith_number":"pith:Z5UDN4AJ","canonical_record":{"source":{"id":"2607.06877","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-07-08T00:25:10Z","cross_cats_sorted":[],"title_canon_sha256":"14310ccba9bd2d05b787f8e0df5ec8bf26b6af85cf19de57c68a4945974c1576","abstract_canon_sha256":"6d842c19a0ae2957d8240d576fb313c0b2203cb107bf5461453bd28e860fe5cc"},"schema_version":"1.0"},"canonical_sha256":"cf6836f009725cb4c40e1b56761870baefc86b5d1552b0fef016776e04b94504","source":{"kind":"arxiv","id":"2607.06877","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.06877","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"arxiv_version","alias_value":"2607.06877v1","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.06877","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"pith_short_12","alias_value":"Z5UDN4AJOJOL","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"pith_short_16","alias_value":"Z5UDN4AJOJOLJRAO","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"pith_short_8","alias_value":"Z5UDN4AJ","created_at":"2026-07-09T00:19:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:Z5UDN4AJOJOLJRAODNLHMGDQXL","target":"record","payload":{"canonical_record":{"source":{"id":"2607.06877","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-07-08T00:25:10Z","cross_cats_sorted":[],"title_canon_sha256":"14310ccba9bd2d05b787f8e0df5ec8bf26b6af85cf19de57c68a4945974c1576","abstract_canon_sha256":"6d842c19a0ae2957d8240d576fb313c0b2203cb107bf5461453bd28e860fe5cc"},"schema_version":"1.0"},"canonical_sha256":"cf6836f009725cb4c40e1b56761870baefc86b5d1552b0fef016776e04b94504","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-09T00:19:38.389651Z","signature_b64":"XCmhVtofK74z8Fk9ztWZXs12pk96haAj1/SfDIW9xdelY6Xn1IDjq0sw600Tt8x0hJ3sf2P90Bvm/l77Yth+AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf6836f009725cb4c40e1b56761870baefc86b5d1552b0fef016776e04b94504","last_reissued_at":"2026-07-09T00:19:38.389157Z","signature_status":"signed_v1","first_computed_at":"2026-07-09T00:19:38.389157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.06877","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":"2026-07-09T00:19:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q/cKM/FBC+Yir10PWLy4G/brwMNsMAkvIt5xhoy5XEvnMuIrNV1e3KkvaMT0dQu8iWj/XaxbfVq9uw/Wvx7cBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T07:31:25.640782Z"},"content_sha256":"7981641facfcebc27a2f023ade63c78a5f7f882e1d095dfb232c95cfb429f0dd","schema_version":"1.0","event_id":"sha256:7981641facfcebc27a2f023ade63c78a5f7f882e1d095dfb232c95cfb429f0dd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:Z5UDN4AJOJOLJRAODNLHMGDQXL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Beyond Silica Assumptions: Optical Network Design in the Hollow-Core Era","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Md Ghulam Saber, Zhiping Jiang","submitted_at":"2026-07-08T00:25:10Z","abstract_excerpt":"Hollow-core fiber (HCF) is often presented as a modestly improved transmission medium that can be inserted into networks originally designed for solid-core silica. We argue instead that recent progress -- most notably the reported attenuation below 0.1 dBkm$^{-1}$, together with a broad low-loss window, reduced propagation delay, and extremely low optical nonlinearity -- makes it timely to reconsider which long-standing design conventions are fundamental to optical communication and which are specific to silica fiber. By reviewing implications at the physical-layer, transceiver, and network-ar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.06877","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.06877/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-09T00:19:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6+qAa4U5C42b0eKHdNgEv3BXcK+dTDDsEc7w5H1wuJy4o9CkdWIPX7T2dEB5y3KYx7QpXAzXQpXjNkRCrHdaBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T07:31:25.641736Z"},"content_sha256":"0f21dbe14b0509a577cf06d32a7fcaa3c7148fcd3d87a675174b80d474aa3a8c","schema_version":"1.0","event_id":"sha256:0f21dbe14b0509a577cf06d32a7fcaa3c7148fcd3d87a675174b80d474aa3a8c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z5UDN4AJOJOLJRAODNLHMGDQXL/bundle.json","state_url":"https://pith.science/pith/Z5UDN4AJOJOLJRAODNLHMGDQXL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z5UDN4AJOJOLJRAODNLHMGDQXL/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":"2026-08-14T07:31:25Z","links":{"resolver":"https://pith.science/pith/Z5UDN4AJOJOLJRAODNLHMGDQXL","bundle":"https://pith.science/pith/Z5UDN4AJOJOLJRAODNLHMGDQXL/bundle.json","state":"https://pith.science/pith/Z5UDN4AJOJOLJRAODNLHMGDQXL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z5UDN4AJOJOLJRAODNLHMGDQXL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:Z5UDN4AJOJOLJRAODNLHMGDQXL","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":"6d842c19a0ae2957d8240d576fb313c0b2203cb107bf5461453bd28e860fe5cc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-07-08T00:25:10Z","title_canon_sha256":"14310ccba9bd2d05b787f8e0df5ec8bf26b6af85cf19de57c68a4945974c1576"},"schema_version":"1.0","source":{"id":"2607.06877","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.06877","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"arxiv_version","alias_value":"2607.06877v1","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.06877","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"pith_short_12","alias_value":"Z5UDN4AJOJOL","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"pith_short_16","alias_value":"Z5UDN4AJOJOLJRAO","created_at":"2026-07-09T00:19:38Z"},{"alias_kind":"pith_short_8","alias_value":"Z5UDN4AJ","created_at":"2026-07-09T00:19:38Z"}],"graph_snapshots":[{"event_id":"sha256:0f21dbe14b0509a577cf06d32a7fcaa3c7148fcd3d87a675174b80d474aa3a8c","target":"graph","created_at":"2026-07-09T00:19:38Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2607.06877/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Hollow-core fiber (HCF) is often presented as a modestly improved transmission medium that can be inserted into networks originally designed for solid-core silica. We argue instead that recent progress -- most notably the reported attenuation below 0.1 dBkm$^{-1}$, together with a broad low-loss window, reduced propagation delay, and extremely low optical nonlinearity -- makes it timely to reconsider which long-standing design conventions are fundamental to optical communication and which are specific to silica fiber. By reviewing implications at the physical-layer, transceiver, and network-ar","authors_text":"Md Ghulam Saber, Zhiping Jiang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-07-08T00:25:10Z","title":"Beyond Silica Assumptions: Optical Network Design in the Hollow-Core Era"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.06877","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":"sha256:7981641facfcebc27a2f023ade63c78a5f7f882e1d095dfb232c95cfb429f0dd","target":"record","created_at":"2026-07-09T00:19:38Z","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":"6d842c19a0ae2957d8240d576fb313c0b2203cb107bf5461453bd28e860fe5cc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-07-08T00:25:10Z","title_canon_sha256":"14310ccba9bd2d05b787f8e0df5ec8bf26b6af85cf19de57c68a4945974c1576"},"schema_version":"1.0","source":{"id":"2607.06877","kind":"arxiv","version":1}},"canonical_sha256":"cf6836f009725cb4c40e1b56761870baefc86b5d1552b0fef016776e04b94504","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cf6836f009725cb4c40e1b56761870baefc86b5d1552b0fef016776e04b94504","first_computed_at":"2026-07-09T00:19:38.389157Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-09T00:19:38.389157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XCmhVtofK74z8Fk9ztWZXs12pk96haAj1/SfDIW9xdelY6Xn1IDjq0sw600Tt8x0hJ3sf2P90Bvm/l77Yth+AQ==","signature_status":"signed_v1","signed_at":"2026-07-09T00:19:38.389651Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.06877","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7981641facfcebc27a2f023ade63c78a5f7f882e1d095dfb232c95cfb429f0dd","sha256:0f21dbe14b0509a577cf06d32a7fcaa3c7148fcd3d87a675174b80d474aa3a8c"],"state_sha256":"28aa5b2995fe4b957faf140cb7050d5e6ce93a649c30004578152b349ece5714"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"moKjN14LVz62g+XyWJ1rAtGQga8gc67u/G+s20XzERDmneW54o64lnqwrxHgfFFOK/ygnUzjPCcz2Ss+9FaTCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T07:31:25.649076Z","bundle_sha256":"b1cf55f617b7008f50350f83ccaf0e4f4d0b1c1239b61434788f02efacca4c67"}}