{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2002:VL3IKMC4RNUXELQ66FZCQWRE27","short_pith_number":"pith:VL3IKMC4","canonical_record":{"source":{"id":"astro-ph/0204147","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2002-04-09T09:57:05Z","cross_cats_sorted":[],"title_canon_sha256":"ecefaf9406393144b7d752720dedad709436a8d777762b9ba90245f33ee7f0d5","abstract_canon_sha256":"f20cd2628db4189a0bf9422b272d1cbcd592817da71a7ddfcc2a58bc75ee316e"},"schema_version":"1.0"},"canonical_sha256":"aaf685305c8b69722e1ef172285a24d7dc163b81c6315eabdb0fd96be2e04de7","source":{"kind":"arxiv","id":"astro-ph/0204147","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0204147","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0204147v1","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0204147","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"pith_short_12","alias_value":"VL3IKMC4RNUX","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"pith_short_16","alias_value":"VL3IKMC4RNUXELQ6","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"pith_short_8","alias_value":"VL3IKMC4","created_at":"2026-07-04T16:29:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2002:VL3IKMC4RNUXELQ66FZCQWRE27","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0204147","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2002-04-09T09:57:05Z","cross_cats_sorted":[],"title_canon_sha256":"ecefaf9406393144b7d752720dedad709436a8d777762b9ba90245f33ee7f0d5","abstract_canon_sha256":"f20cd2628db4189a0bf9422b272d1cbcd592817da71a7ddfcc2a58bc75ee316e"},"schema_version":"1.0"},"canonical_sha256":"aaf685305c8b69722e1ef172285a24d7dc163b81c6315eabdb0fd96be2e04de7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:29:40.405504Z","signature_b64":"Eiufcd/qdkAexG0XkKL6xCI0mPoc8hOvfrFgpvNO9IpkmMVHtf4zq/gTv5j/5i1P0EWucuQT9qFFcZ0sX/ZHDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aaf685305c8b69722e1ef172285a24d7dc163b81c6315eabdb0fd96be2e04de7","last_reissued_at":"2026-07-04T16:29:40.405115Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:29:40.405115Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0204147","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":"2026-07-04T16:29:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8owmLUD7Kz1iJdPoyHXHbG4qtmRm4qbiOuoc5yLO6yoHTWpe1JV3Q8d7PoI0plo9qOKiDc0XW/fsHfOCeG5qCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T07:20:21.949916Z"},"content_sha256":"3465d4d2d1e85a2181d6926d737d5f45f8775819a1a25720e78c6a0c51ad03da","schema_version":"1.0","event_id":"sha256:3465d4d2d1e85a2181d6926d737d5f45f8775819a1a25720e78c6a0c51ad03da"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2002:VL3IKMC4RNUXELQ66FZCQWRE27","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"X-ray background measurements with XMM-Newton EPIC","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. De Luca, D. H. Lumb, M. Page, R. S. Warwick","submitted_at":"2002-04-09T09:57:05Z","abstract_excerpt":"We discuss the methods used to compile a high signal-to-noise dataset representative of both the instrumental and cosmic background signal measured at high galactic latitude by the XMM-Newton EPIC cameras. The characteristics of the EPIC background are described and the potential applications of the derived dataset in general science analysis are outlined. In the case of the cosmic X-ray background, the transition between a hard power-law spectrum (due to the integrated emission of unresolved, largely extragalactic, point sources) and a softer thermal spectrum (produced by hot plasma associate"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0204147","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/astro-ph/0204147/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":"2026-07-04T16:29:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/Mlw1mKw+Qb3QNKkdQmIE0MuWGEcjhSAU31qJd4rEnwKzUW8jntgxkp4TdCHh6VZTlQ18JbLWRABpemJFPgHCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T07:20:21.950425Z"},"content_sha256":"0044b31781729d784c01be70d9c3c9ae5882fd1d2fed0bda5cc22676a69c7360","schema_version":"1.0","event_id":"sha256:0044b31781729d784c01be70d9c3c9ae5882fd1d2fed0bda5cc22676a69c7360"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VL3IKMC4RNUXELQ66FZCQWRE27/bundle.json","state_url":"https://pith.science/pith/VL3IKMC4RNUXELQ66FZCQWRE27/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VL3IKMC4RNUXELQ66FZCQWRE27/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":"2026-08-12T07:20:21Z","links":{"resolver":"https://pith.science/pith/VL3IKMC4RNUXELQ66FZCQWRE27","bundle":"https://pith.science/pith/VL3IKMC4RNUXELQ66FZCQWRE27/bundle.json","state":"https://pith.science/pith/VL3IKMC4RNUXELQ66FZCQWRE27/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VL3IKMC4RNUXELQ66FZCQWRE27/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:VL3IKMC4RNUXELQ66FZCQWRE27","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":"f20cd2628db4189a0bf9422b272d1cbcd592817da71a7ddfcc2a58bc75ee316e","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-04-09T09:57:05Z","title_canon_sha256":"ecefaf9406393144b7d752720dedad709436a8d777762b9ba90245f33ee7f0d5"},"schema_version":"1.0","source":{"id":"astro-ph/0204147","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0204147","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0204147v1","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0204147","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"pith_short_12","alias_value":"VL3IKMC4RNUX","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"pith_short_16","alias_value":"VL3IKMC4RNUXELQ6","created_at":"2026-07-04T16:29:40Z"},{"alias_kind":"pith_short_8","alias_value":"VL3IKMC4","created_at":"2026-07-04T16:29:40Z"}],"graph_snapshots":[{"event_id":"sha256:0044b31781729d784c01be70d9c3c9ae5882fd1d2fed0bda5cc22676a69c7360","target":"graph","created_at":"2026-07-04T16:29:40Z","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/astro-ph/0204147/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We discuss the methods used to compile a high signal-to-noise dataset representative of both the instrumental and cosmic background signal measured at high galactic latitude by the XMM-Newton EPIC cameras. The characteristics of the EPIC background are described and the potential applications of the derived dataset in general science analysis are outlined. In the case of the cosmic X-ray background, the transition between a hard power-law spectrum (due to the integrated emission of unresolved, largely extragalactic, point sources) and a softer thermal spectrum (produced by hot plasma associate","authors_text":"A. De Luca, D. H. Lumb, M. Page, R. S. Warwick","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2002-04-09T09:57:05Z","title":"X-ray background measurements with XMM-Newton EPIC"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0204147","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":"sha256:3465d4d2d1e85a2181d6926d737d5f45f8775819a1a25720e78c6a0c51ad03da","target":"record","created_at":"2026-07-04T16:29:40Z","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":"f20cd2628db4189a0bf9422b272d1cbcd592817da71a7ddfcc2a58bc75ee316e","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-04-09T09:57:05Z","title_canon_sha256":"ecefaf9406393144b7d752720dedad709436a8d777762b9ba90245f33ee7f0d5"},"schema_version":"1.0","source":{"id":"astro-ph/0204147","kind":"arxiv","version":1}},"canonical_sha256":"aaf685305c8b69722e1ef172285a24d7dc163b81c6315eabdb0fd96be2e04de7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aaf685305c8b69722e1ef172285a24d7dc163b81c6315eabdb0fd96be2e04de7","first_computed_at":"2026-07-04T16:29:40.405115Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:29:40.405115Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Eiufcd/qdkAexG0XkKL6xCI0mPoc8hOvfrFgpvNO9IpkmMVHtf4zq/gTv5j/5i1P0EWucuQT9qFFcZ0sX/ZHDA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:29:40.405504Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0204147","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3465d4d2d1e85a2181d6926d737d5f45f8775819a1a25720e78c6a0c51ad03da","sha256:0044b31781729d784c01be70d9c3c9ae5882fd1d2fed0bda5cc22676a69c7360"],"state_sha256":"0724e21b4a153459d8434af59e7c1dda4d634fd19e698119e1aa5297545c53e9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HvRSR0MYDYtyId+ztnEXL8gqPLGD8nwUW5V2azjiUg1OLUDUwWcQebrbhLt3/BupEe9XW8QDiueH8Wgav/4nDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-12T07:20:21.955532Z","bundle_sha256":"3024ebfc61f6eb2b8d0da59cb850e3600849f38856c18da27ba670e6c724626f"}}