{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:SGHQLZVKU5MWAWGNG2PLLRSVZ5","short_pith_number":"pith:SGHQLZVK","canonical_record":{"source":{"id":"0807.4294","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-27T14:13:28Z","cross_cats_sorted":[],"title_canon_sha256":"514a9f71b2c1a4f9f652d54b3a8cf82cd35517227a73873e54fb83ba459fa985","abstract_canon_sha256":"a98d415a492a75f18778d28e6c1c64c6f175dac4f46b44ec0ba28188e3468b0e"},"schema_version":"1.0"},"canonical_sha256":"918f05e6aaa7596058cd369eb5c655cf4a317f7fcc1b4c7f6b0981f728c4f066","source":{"kind":"arxiv","id":"0807.4294","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.4294","created_at":"2026-05-18T02:35:15Z"},{"alias_kind":"arxiv_version","alias_value":"0807.4294v2","created_at":"2026-05-18T02:35:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.4294","created_at":"2026-05-18T02:35:15Z"},{"alias_kind":"pith_short_12","alias_value":"SGHQLZVKU5MW","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"SGHQLZVKU5MWAWGN","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"SGHQLZVK","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:SGHQLZVKU5MWAWGNG2PLLRSVZ5","target":"record","payload":{"canonical_record":{"source":{"id":"0807.4294","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-27T14:13:28Z","cross_cats_sorted":[],"title_canon_sha256":"514a9f71b2c1a4f9f652d54b3a8cf82cd35517227a73873e54fb83ba459fa985","abstract_canon_sha256":"a98d415a492a75f18778d28e6c1c64c6f175dac4f46b44ec0ba28188e3468b0e"},"schema_version":"1.0"},"canonical_sha256":"918f05e6aaa7596058cd369eb5c655cf4a317f7fcc1b4c7f6b0981f728c4f066","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:35:15.468842Z","signature_b64":"u+VG3qeA2TAZXdAy0/Gb79Y2ha/mg+J8OpdgAiTSq8SF9/lW9UH6aEKONEFzDfptKgadK1EHLhyIqBo/4b8jCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"918f05e6aaa7596058cd369eb5c655cf4a317f7fcc1b4c7f6b0981f728c4f066","last_reissued_at":"2026-05-18T02:35:15.468268Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:35:15.468268Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0807.4294","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:35:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zniojbI+UIvYyWMoLUNtMfS8bQvPs0nbM7rcnjv//HdwJIGurJZOmtFoMs4KUyc5IeJ9h7ohbz9kOuwyXDWQAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T07:44:04.893586Z"},"content_sha256":"5666007f89e80448bddbf8eeaea8183354276ab503fa0dd54fd7617023fafbce","schema_version":"1.0","event_id":"sha256:5666007f89e80448bddbf8eeaea8183354276ab503fa0dd54fd7617023fafbce"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:SGHQLZVKU5MWAWGNG2PLLRSVZ5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The stellar contribution to the extra-galactic background light and absorption of high-energy gamma-rays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Charles D. Dermer, Justin D. Finke, Soebur Razzaque","submitted_at":"2008-07-27T14:13:28Z","abstract_excerpt":"TeV gamma rays from distant astrophysical sources are attenuated due to electron-positron pair creation by interacting with ultraviolet/optical to infrared photons which fill the universe and are collectively known as the extra-galactic background light (EBL). We model the ~0.1-10 eV starlight component of the EBL derived from expressions for the stellar initial mass function, star formation history of the universe, and wavelength-dependent absorption of a large sample of galaxies in the local universe. These models are simultaneously fitted to the EBL data as well as to the data on the stella"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.4294","kind":"arxiv","version":2},"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":"2026-05-18T02:35:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/AVbVE7MpRcpzUjTlKFizIE0tnK6Yx76/BW/+3Q1m5xWlkz6P9Yblbk3w/8iOpebSqmPGUHN2XFxwuhhXnO+BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T07:44:04.893931Z"},"content_sha256":"14475fa9d0cd3cc636036298fad16b3d6ae09367edb7f33b221ddd3312dce1ec","schema_version":"1.0","event_id":"sha256:14475fa9d0cd3cc636036298fad16b3d6ae09367edb7f33b221ddd3312dce1ec"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SGHQLZVKU5MWAWGNG2PLLRSVZ5/bundle.json","state_url":"https://pith.science/pith/SGHQLZVKU5MWAWGNG2PLLRSVZ5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SGHQLZVKU5MWAWGNG2PLLRSVZ5/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":"2026-06-03T07:44:04Z","links":{"resolver":"https://pith.science/pith/SGHQLZVKU5MWAWGNG2PLLRSVZ5","bundle":"https://pith.science/pith/SGHQLZVKU5MWAWGNG2PLLRSVZ5/bundle.json","state":"https://pith.science/pith/SGHQLZVKU5MWAWGNG2PLLRSVZ5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SGHQLZVKU5MWAWGNG2PLLRSVZ5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:SGHQLZVKU5MWAWGNG2PLLRSVZ5","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":"a98d415a492a75f18778d28e6c1c64c6f175dac4f46b44ec0ba28188e3468b0e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-27T14:13:28Z","title_canon_sha256":"514a9f71b2c1a4f9f652d54b3a8cf82cd35517227a73873e54fb83ba459fa985"},"schema_version":"1.0","source":{"id":"0807.4294","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.4294","created_at":"2026-05-18T02:35:15Z"},{"alias_kind":"arxiv_version","alias_value":"0807.4294v2","created_at":"2026-05-18T02:35:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.4294","created_at":"2026-05-18T02:35:15Z"},{"alias_kind":"pith_short_12","alias_value":"SGHQLZVKU5MW","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"SGHQLZVKU5MWAWGN","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"SGHQLZVK","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:14475fa9d0cd3cc636036298fad16b3d6ae09367edb7f33b221ddd3312dce1ec","target":"graph","created_at":"2026-05-18T02:35:15Z","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":"TeV gamma rays from distant astrophysical sources are attenuated due to electron-positron pair creation by interacting with ultraviolet/optical to infrared photons which fill the universe and are collectively known as the extra-galactic background light (EBL). We model the ~0.1-10 eV starlight component of the EBL derived from expressions for the stellar initial mass function, star formation history of the universe, and wavelength-dependent absorption of a large sample of galaxies in the local universe. These models are simultaneously fitted to the EBL data as well as to the data on the stella","authors_text":"Charles D. Dermer, Justin D. Finke, Soebur Razzaque","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-27T14:13:28Z","title":"The stellar contribution to the extra-galactic background light and absorption of high-energy gamma-rays"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.4294","kind":"arxiv","version":2},"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":"sha256:5666007f89e80448bddbf8eeaea8183354276ab503fa0dd54fd7617023fafbce","target":"record","created_at":"2026-05-18T02:35:15Z","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":"a98d415a492a75f18778d28e6c1c64c6f175dac4f46b44ec0ba28188e3468b0e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-27T14:13:28Z","title_canon_sha256":"514a9f71b2c1a4f9f652d54b3a8cf82cd35517227a73873e54fb83ba459fa985"},"schema_version":"1.0","source":{"id":"0807.4294","kind":"arxiv","version":2}},"canonical_sha256":"918f05e6aaa7596058cd369eb5c655cf4a317f7fcc1b4c7f6b0981f728c4f066","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"918f05e6aaa7596058cd369eb5c655cf4a317f7fcc1b4c7f6b0981f728c4f066","first_computed_at":"2026-05-18T02:35:15.468268Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:35:15.468268Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"u+VG3qeA2TAZXdAy0/Gb79Y2ha/mg+J8OpdgAiTSq8SF9/lW9UH6aEKONEFzDfptKgadK1EHLhyIqBo/4b8jCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:35:15.468842Z","signed_message":"canonical_sha256_bytes"},"source_id":"0807.4294","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5666007f89e80448bddbf8eeaea8183354276ab503fa0dd54fd7617023fafbce","sha256:14475fa9d0cd3cc636036298fad16b3d6ae09367edb7f33b221ddd3312dce1ec"],"state_sha256":"2fabef27edc2d1cf36adc560c849dd462adb258f52e3bf5632a705b17b572c73"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S5IxpxO7y8nsAsM3lc7rA2orjhhIqjK6TZSbakehDKkwxDqlbezO4PBDb3Pz1Adeq0sku//301LWerh/CghOBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T07:44:04.895832Z","bundle_sha256":"1d7ddd5cfe054ebda23628142aa75f47fcb4fec528d97f17cdf86e73ac70d467"}}