{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:KCG2JWB3I46PWJO2HVBMJH6GWF","short_pith_number":"pith:KCG2JWB3","canonical_record":{"source":{"id":"1811.12079","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-11-29T11:38:38Z","cross_cats_sorted":[],"title_canon_sha256":"a063ceaffc4725e78b91a222166660ab423881291bd936c67fceb3a770204557","abstract_canon_sha256":"4a728c77d002f844b32b2a61d95ff52e461f964d961d1340d0f61bc76ba0763d"},"schema_version":"1.0"},"canonical_sha256":"508da4d83b473cfb25da3d42c49fc6b172419fe89b6c40a84ec9d5b568c84a4c","source":{"kind":"arxiv","id":"1811.12079","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.12079","created_at":"2026-05-17T23:55:10Z"},{"alias_kind":"arxiv_version","alias_value":"1811.12079v1","created_at":"2026-05-17T23:55:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.12079","created_at":"2026-05-17T23:55:10Z"},{"alias_kind":"pith_short_12","alias_value":"KCG2JWB3I46P","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"KCG2JWB3I46PWJO2","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"KCG2JWB3","created_at":"2026-05-18T12:32:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:KCG2JWB3I46PWJO2HVBMJH6GWF","target":"record","payload":{"canonical_record":{"source":{"id":"1811.12079","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-11-29T11:38:38Z","cross_cats_sorted":[],"title_canon_sha256":"a063ceaffc4725e78b91a222166660ab423881291bd936c67fceb3a770204557","abstract_canon_sha256":"4a728c77d002f844b32b2a61d95ff52e461f964d961d1340d0f61bc76ba0763d"},"schema_version":"1.0"},"canonical_sha256":"508da4d83b473cfb25da3d42c49fc6b172419fe89b6c40a84ec9d5b568c84a4c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:10.869731Z","signature_b64":"dA99CjEo2mNHMCBMifLRPujzJg6I9h4dQ/QBmto+TVrjs03k77ErhzzZ9a/ztHYm+7uuTl6XFTWlsgM5CSc7CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"508da4d83b473cfb25da3d42c49fc6b172419fe89b6c40a84ec9d5b568c84a4c","last_reissued_at":"2026-05-17T23:55:10.869292Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:10.869292Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.12079","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":"2026-05-17T23:55:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xxneAYUhmFurSw8tNQG567F6Cte/KgP4jMPXtMU/4HEG8kl8CeOQBn41ShKUE2QbGeAPu3UxEJaJj4WcMRzmBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T21:45:48.492491Z"},"content_sha256":"0d3292e2e2fd35bc64355929b73ad68998dae6089a40355d12ee018968ffd43f","schema_version":"1.0","event_id":"sha256:0d3292e2e2fd35bc64355929b73ad68998dae6089a40355d12ee018968ffd43f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:KCG2JWB3I46PWJO2HVBMJH6GWF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectral and Temporal Variability of Earth Observed in Polarization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Claudia Emde, Daphne M. Stam, Michael F. Sterzik, Mihail Manev, Stefano Bagnulo","submitted_at":"2018-11-29T11:38:38Z","abstract_excerpt":"We present a comprehensive set of spectropolarimetric observations of Earthshine as obtained by FORS2 at the VLT for phase angles from 50degree to 135degree (Sun-Earth-Moon angle), covering a spectral range from 430nm to 920nm. The degree of polarization in BVRI passbands, the differential polarization vegetation index, and the equivalent width of the O2A polarization band around 760nm are determined with absolute errors around 0.1 percent in the degree of polarization. Earthshine polarization spectra are corrected for the effect of depolarization introduced by backscattering on the lunar surf"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.12079","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":"2026-05-17T23:55:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a51jx0NjK5hDCn1gm8JR8D+7M0HMTVnaLPZ/otlJBboj36QEUwcJUO0/NbiTGFLYX1gmlvKtE0d1huQehRVSBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T21:45:48.492858Z"},"content_sha256":"ff2c5d600ddb92ba35e9e44176af1c1160b7c9b6a1b0dee7439a625fc7073c2a","schema_version":"1.0","event_id":"sha256:ff2c5d600ddb92ba35e9e44176af1c1160b7c9b6a1b0dee7439a625fc7073c2a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KCG2JWB3I46PWJO2HVBMJH6GWF/bundle.json","state_url":"https://pith.science/pith/KCG2JWB3I46PWJO2HVBMJH6GWF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KCG2JWB3I46PWJO2HVBMJH6GWF/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":"2026-06-04T21:45:48Z","links":{"resolver":"https://pith.science/pith/KCG2JWB3I46PWJO2HVBMJH6GWF","bundle":"https://pith.science/pith/KCG2JWB3I46PWJO2HVBMJH6GWF/bundle.json","state":"https://pith.science/pith/KCG2JWB3I46PWJO2HVBMJH6GWF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KCG2JWB3I46PWJO2HVBMJH6GWF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:KCG2JWB3I46PWJO2HVBMJH6GWF","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":"4a728c77d002f844b32b2a61d95ff52e461f964d961d1340d0f61bc76ba0763d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-11-29T11:38:38Z","title_canon_sha256":"a063ceaffc4725e78b91a222166660ab423881291bd936c67fceb3a770204557"},"schema_version":"1.0","source":{"id":"1811.12079","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.12079","created_at":"2026-05-17T23:55:10Z"},{"alias_kind":"arxiv_version","alias_value":"1811.12079v1","created_at":"2026-05-17T23:55:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.12079","created_at":"2026-05-17T23:55:10Z"},{"alias_kind":"pith_short_12","alias_value":"KCG2JWB3I46P","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"KCG2JWB3I46PWJO2","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"KCG2JWB3","created_at":"2026-05-18T12:32:33Z"}],"graph_snapshots":[{"event_id":"sha256:ff2c5d600ddb92ba35e9e44176af1c1160b7c9b6a1b0dee7439a625fc7073c2a","target":"graph","created_at":"2026-05-17T23:55:10Z","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":"We present a comprehensive set of spectropolarimetric observations of Earthshine as obtained by FORS2 at the VLT for phase angles from 50degree to 135degree (Sun-Earth-Moon angle), covering a spectral range from 430nm to 920nm. The degree of polarization in BVRI passbands, the differential polarization vegetation index, and the equivalent width of the O2A polarization band around 760nm are determined with absolute errors around 0.1 percent in the degree of polarization. Earthshine polarization spectra are corrected for the effect of depolarization introduced by backscattering on the lunar surf","authors_text":"Claudia Emde, Daphne M. Stam, Michael F. Sterzik, Mihail Manev, Stefano Bagnulo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-11-29T11:38:38Z","title":"Spectral and Temporal Variability of Earth Observed in Polarization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.12079","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":"sha256:0d3292e2e2fd35bc64355929b73ad68998dae6089a40355d12ee018968ffd43f","target":"record","created_at":"2026-05-17T23:55:10Z","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":"4a728c77d002f844b32b2a61d95ff52e461f964d961d1340d0f61bc76ba0763d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-11-29T11:38:38Z","title_canon_sha256":"a063ceaffc4725e78b91a222166660ab423881291bd936c67fceb3a770204557"},"schema_version":"1.0","source":{"id":"1811.12079","kind":"arxiv","version":1}},"canonical_sha256":"508da4d83b473cfb25da3d42c49fc6b172419fe89b6c40a84ec9d5b568c84a4c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"508da4d83b473cfb25da3d42c49fc6b172419fe89b6c40a84ec9d5b568c84a4c","first_computed_at":"2026-05-17T23:55:10.869292Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:10.869292Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dA99CjEo2mNHMCBMifLRPujzJg6I9h4dQ/QBmto+TVrjs03k77ErhzzZ9a/ztHYm+7uuTl6XFTWlsgM5CSc7CQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:10.869731Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.12079","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0d3292e2e2fd35bc64355929b73ad68998dae6089a40355d12ee018968ffd43f","sha256:ff2c5d600ddb92ba35e9e44176af1c1160b7c9b6a1b0dee7439a625fc7073c2a"],"state_sha256":"68b95088abf03df93315d56473f778f79fda7a09d4ad8ac3f2c0b370e5d80acc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6jy5JRxaog54H0zZAZ30fEbydjGnKBfTDRyLx/Y2cz4tYG73x2vg8/IIQgBrxzhmlHvBERPvyfJpmxVbgXSlDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T21:45:48.495181Z","bundle_sha256":"e699043cc156b660f9bbf149e6bfc73bb96b23810ce2ce8c984443df64133dcb"}}