{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:PRXNSCB2B53IMNBDBMYNGRVRZW","short_pith_number":"pith:PRXNSCB2","canonical_record":{"source":{"id":"0802.3806","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-26T13:04:35Z","cross_cats_sorted":[],"title_canon_sha256":"32a5d0e2c657313dc703869375e465ed69335019e5a90b2052374b7cfc888820","abstract_canon_sha256":"266f940d255969161c4f54575c51e82d520b115eaa0288b2eaa7d2d9893520f3"},"schema_version":"1.0"},"canonical_sha256":"7c6ed9083a0f768634230b30d346b1cd93098ef9d60c19db76f33372f26b41ef","source":{"kind":"arxiv","id":"0802.3806","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0802.3806","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"arxiv_version","alias_value":"0802.3806v1","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0802.3806","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"pith_short_12","alias_value":"PRXNSCB2B53I","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"pith_short_16","alias_value":"PRXNSCB2B53IMNBD","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"pith_short_8","alias_value":"PRXNSCB2","created_at":"2026-07-04T15:09:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:PRXNSCB2B53IMNBDBMYNGRVRZW","target":"record","payload":{"canonical_record":{"source":{"id":"0802.3806","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-26T13:04:35Z","cross_cats_sorted":[],"title_canon_sha256":"32a5d0e2c657313dc703869375e465ed69335019e5a90b2052374b7cfc888820","abstract_canon_sha256":"266f940d255969161c4f54575c51e82d520b115eaa0288b2eaa7d2d9893520f3"},"schema_version":"1.0"},"canonical_sha256":"7c6ed9083a0f768634230b30d346b1cd93098ef9d60c19db76f33372f26b41ef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:09:49.982266Z","signature_b64":"7d1pGrKM6svQdXcdRe2Trny9V9jgLuT2bSDmnSVVgBmN5EgtNVhcVbThDiPwYil7Hf1AakCKqpbt6YOPU53hDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7c6ed9083a0f768634230b30d346b1cd93098ef9d60c19db76f33372f26b41ef","last_reissued_at":"2026-07-04T15:09:49.981806Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:09:49.981806Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0802.3806","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":"2026-07-04T15:09:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N8ezgEoxevxswNI/jD5IMsbIZzdM8SlKCaKAgm7ANybOKGnyqW7E/pcLf3w+bBROWPtNm/XOSaUh1hjRXJ/hCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T17:00:30.002230Z"},"content_sha256":"0bb81bb8b82e39f5a0148a05759204af8d9f2b60a8a4fff8c6e3e7444df30a9f","schema_version":"1.0","event_id":"sha256:0bb81bb8b82e39f5a0148a05759204af8d9f2b60a8a4fff8c6e3e7444df30a9f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:PRXNSCB2B53IMNBDBMYNGRVRZW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the potential value of Ca II K spectroheliogram time-series for solar activity and irradiance studies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. G. Tlatov, I. Ermolli, J. Singh, N. A. Krivova, R. K. Ulrich, S. K. Solanki","submitted_at":"2008-02-26T13:04:35Z","abstract_excerpt":"Various observatories around the globe started regular full-disk imaging of the solar atmosphere in the Ca II K line since the early decades of the 20th century. The archives made by these observations have the potential of providing far more detailed information on solar magnetism than just the sunspot number and area records to which most studies of solar activity and irradiance changes are restricted. We evaluate the image contents of three Ca II K spectroheliogram time-series, specifically those obtained by the digitization of the Arcetri, Kodaikanal, and Mt Wilson photographic archives. W"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0802.3806","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/0802.3806/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":"2026-07-04T15:09:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+7amAWFuOMaCd4MXbhlTbCORGScEyrLko3x9fVQ4Ras572HTKXSRVLxIB+6eLuNgOUUMjLffFwd8wP53OfqnDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T17:00:30.002862Z"},"content_sha256":"d0b2c3d961b6369b3b136747c1650876ef6333ff27bd585d10f1dfcfee834964","schema_version":"1.0","event_id":"sha256:d0b2c3d961b6369b3b136747c1650876ef6333ff27bd585d10f1dfcfee834964"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PRXNSCB2B53IMNBDBMYNGRVRZW/bundle.json","state_url":"https://pith.science/pith/PRXNSCB2B53IMNBDBMYNGRVRZW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PRXNSCB2B53IMNBDBMYNGRVRZW/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":"2026-08-13T17:00:30Z","links":{"resolver":"https://pith.science/pith/PRXNSCB2B53IMNBDBMYNGRVRZW","bundle":"https://pith.science/pith/PRXNSCB2B53IMNBDBMYNGRVRZW/bundle.json","state":"https://pith.science/pith/PRXNSCB2B53IMNBDBMYNGRVRZW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PRXNSCB2B53IMNBDBMYNGRVRZW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:PRXNSCB2B53IMNBDBMYNGRVRZW","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":"266f940d255969161c4f54575c51e82d520b115eaa0288b2eaa7d2d9893520f3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-26T13:04:35Z","title_canon_sha256":"32a5d0e2c657313dc703869375e465ed69335019e5a90b2052374b7cfc888820"},"schema_version":"1.0","source":{"id":"0802.3806","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0802.3806","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"arxiv_version","alias_value":"0802.3806v1","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0802.3806","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"pith_short_12","alias_value":"PRXNSCB2B53I","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"pith_short_16","alias_value":"PRXNSCB2B53IMNBD","created_at":"2026-07-04T15:09:49Z"},{"alias_kind":"pith_short_8","alias_value":"PRXNSCB2","created_at":"2026-07-04T15:09:49Z"}],"graph_snapshots":[{"event_id":"sha256:d0b2c3d961b6369b3b136747c1650876ef6333ff27bd585d10f1dfcfee834964","target":"graph","created_at":"2026-07-04T15:09:49Z","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/0802.3806/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Various observatories around the globe started regular full-disk imaging of the solar atmosphere in the Ca II K line since the early decades of the 20th century. The archives made by these observations have the potential of providing far more detailed information on solar magnetism than just the sunspot number and area records to which most studies of solar activity and irradiance changes are restricted. We evaluate the image contents of three Ca II K spectroheliogram time-series, specifically those obtained by the digitization of the Arcetri, Kodaikanal, and Mt Wilson photographic archives. W","authors_text":"A. G. Tlatov, I. Ermolli, J. Singh, N. A. Krivova, R. K. Ulrich, S. K. Solanki","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-26T13:04:35Z","title":"On the potential value of Ca II K spectroheliogram time-series for solar activity and irradiance studies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0802.3806","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":"sha256:0bb81bb8b82e39f5a0148a05759204af8d9f2b60a8a4fff8c6e3e7444df30a9f","target":"record","created_at":"2026-07-04T15:09:49Z","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":"266f940d255969161c4f54575c51e82d520b115eaa0288b2eaa7d2d9893520f3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-26T13:04:35Z","title_canon_sha256":"32a5d0e2c657313dc703869375e465ed69335019e5a90b2052374b7cfc888820"},"schema_version":"1.0","source":{"id":"0802.3806","kind":"arxiv","version":1}},"canonical_sha256":"7c6ed9083a0f768634230b30d346b1cd93098ef9d60c19db76f33372f26b41ef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7c6ed9083a0f768634230b30d346b1cd93098ef9d60c19db76f33372f26b41ef","first_computed_at":"2026-07-04T15:09:49.981806Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:09:49.981806Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7d1pGrKM6svQdXcdRe2Trny9V9jgLuT2bSDmnSVVgBmN5EgtNVhcVbThDiPwYil7Hf1AakCKqpbt6YOPU53hDQ==","signature_status":"signed_v1","signed_at":"2026-07-04T15:09:49.982266Z","signed_message":"canonical_sha256_bytes"},"source_id":"0802.3806","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0bb81bb8b82e39f5a0148a05759204af8d9f2b60a8a4fff8c6e3e7444df30a9f","sha256:d0b2c3d961b6369b3b136747c1650876ef6333ff27bd585d10f1dfcfee834964"],"state_sha256":"f4a11847e8968bfe6b195e29eac4a4e5576a4eb4bee7623d818cbfea40aa2a58"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AfWS7wrnlHNygo2Nctx+3JIB6Lg3MxSzBMvr7zO2fCvDMYCktOHpspK0glSKxORB9VSCghVlGVUBsWkMs3B5DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T17:00:30.009930Z","bundle_sha256":"cee1187dc69b1418ccbf454d238c04207e9727785590db32b16c8f6e27bcf5b8"}}