{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:2U2GGJ7TZ2FGYP2RSSJ5CATKZA","short_pith_number":"pith:2U2GGJ7T","canonical_record":{"source":{"id":"1908.04350","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-08-12T19:29:19Z","cross_cats_sorted":[],"title_canon_sha256":"44598013206c4cb3d3409f82617b7d8fa8804da12953a7c619b56ab99fde6e19","abstract_canon_sha256":"231c6de70d0f212fd2cc2cadf27d384af9b6a14d8b459dd9adc573e224f21019"},"schema_version":"1.0"},"canonical_sha256":"d5346327f3ce8a6c3f519493d1026ac80b08dd220b2aa45852cc8b1e034911be","source":{"kind":"arxiv","id":"1908.04350","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.04350","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"arxiv_version","alias_value":"1908.04350v1","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.04350","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"pith_short_12","alias_value":"2U2GGJ7TZ2FG","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"pith_short_16","alias_value":"2U2GGJ7TZ2FGYP2R","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"pith_short_8","alias_value":"2U2GGJ7T","created_at":"2026-07-05T00:00:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:2U2GGJ7TZ2FGYP2RSSJ5CATKZA","target":"record","payload":{"canonical_record":{"source":{"id":"1908.04350","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-08-12T19:29:19Z","cross_cats_sorted":[],"title_canon_sha256":"44598013206c4cb3d3409f82617b7d8fa8804da12953a7c619b56ab99fde6e19","abstract_canon_sha256":"231c6de70d0f212fd2cc2cadf27d384af9b6a14d8b459dd9adc573e224f21019"},"schema_version":"1.0"},"canonical_sha256":"d5346327f3ce8a6c3f519493d1026ac80b08dd220b2aa45852cc8b1e034911be","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:00:27.764996Z","signature_b64":"Yk9JPAr3iRDsmP8fDRDQDwd92iPGgXE+ajFNzRIRjDjXKxAgClfaMV+h0/cTbWAIFfsPEtoYnw4L1BVCiW5WBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d5346327f3ce8a6c3f519493d1026ac80b08dd220b2aa45852cc8b1e034911be","last_reissued_at":"2026-07-05T00:00:27.764494Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:00:27.764494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.04350","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":"2026-07-05T00:00:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n3zteP3tu7Pcdlh4h4zXvG0iP71sojAz4iBqrRHaRt+T8436kMKNrPnbpzRX7d3ndlwM8yvIXY0k73tNGQzUAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T12:02:43.803547Z"},"content_sha256":"74a41550dde6ac37b4734be25f2fc8824d99393c29290a09b00bf953f525ea69","schema_version":"1.0","event_id":"sha256:74a41550dde6ac37b4734be25f2fc8824d99393c29290a09b00bf953f525ea69"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:2U2GGJ7TZ2FGYP2RSSJ5CATKZA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Earth as an Exoplanet: A Two-dimensional Alien Map","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Cheng Li, David Crisp, Jia-Zheng Li, Jonathan H. Jiang, Siteng Fan, Stuart Bartlett, Vijay Natraj, Yuk L. Yung","submitted_at":"2019-08-12T19:29:19Z","abstract_excerpt":"Resolving spatially-varying exoplanet features from single-point light curves is essential for determining whether Earth-like worlds harbor geological features and/or climate systems that influence habitability. To evaluate the feasibility and requirements of this spatial feature resolving problem, we present an analysis of multi-wavelength single-point light curves of Earth, where it plays the role of a proxy exoplanet. Here, ~10,000 DSCOVR/EPIC frames collected over a two-year period were integrated over the Earth's disk to yield a spectrally-dependent point source and analyzed using singula"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.04350","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/1908.04350/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":"2026-07-05T00:00:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bdhkhIkPQq49n5Z4wnH6wV2/Z8wE9gls3dcwfJtC70kni+nq3hFHe+GRB9zRDnAEiYY3+77tNS514ydzdrixDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T12:02:43.804500Z"},"content_sha256":"8fb2cecf1fc316984885d38153a3442d17965472072bf6bad1f85a1dcc80dbbc","schema_version":"1.0","event_id":"sha256:8fb2cecf1fc316984885d38153a3442d17965472072bf6bad1f85a1dcc80dbbc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2U2GGJ7TZ2FGYP2RSSJ5CATKZA/bundle.json","state_url":"https://pith.science/pith/2U2GGJ7TZ2FGYP2RSSJ5CATKZA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2U2GGJ7TZ2FGYP2RSSJ5CATKZA/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":"2026-08-16T12:02:43Z","links":{"resolver":"https://pith.science/pith/2U2GGJ7TZ2FGYP2RSSJ5CATKZA","bundle":"https://pith.science/pith/2U2GGJ7TZ2FGYP2RSSJ5CATKZA/bundle.json","state":"https://pith.science/pith/2U2GGJ7TZ2FGYP2RSSJ5CATKZA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2U2GGJ7TZ2FGYP2RSSJ5CATKZA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:2U2GGJ7TZ2FGYP2RSSJ5CATKZA","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":"231c6de70d0f212fd2cc2cadf27d384af9b6a14d8b459dd9adc573e224f21019","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-08-12T19:29:19Z","title_canon_sha256":"44598013206c4cb3d3409f82617b7d8fa8804da12953a7c619b56ab99fde6e19"},"schema_version":"1.0","source":{"id":"1908.04350","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.04350","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"arxiv_version","alias_value":"1908.04350v1","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.04350","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"pith_short_12","alias_value":"2U2GGJ7TZ2FG","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"pith_short_16","alias_value":"2U2GGJ7TZ2FGYP2R","created_at":"2026-07-05T00:00:27Z"},{"alias_kind":"pith_short_8","alias_value":"2U2GGJ7T","created_at":"2026-07-05T00:00:27Z"}],"graph_snapshots":[{"event_id":"sha256:8fb2cecf1fc316984885d38153a3442d17965472072bf6bad1f85a1dcc80dbbc","target":"graph","created_at":"2026-07-05T00:00:27Z","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/1908.04350/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Resolving spatially-varying exoplanet features from single-point light curves is essential for determining whether Earth-like worlds harbor geological features and/or climate systems that influence habitability. To evaluate the feasibility and requirements of this spatial feature resolving problem, we present an analysis of multi-wavelength single-point light curves of Earth, where it plays the role of a proxy exoplanet. Here, ~10,000 DSCOVR/EPIC frames collected over a two-year period were integrated over the Earth's disk to yield a spectrally-dependent point source and analyzed using singula","authors_text":"Cheng Li, David Crisp, Jia-Zheng Li, Jonathan H. Jiang, Siteng Fan, Stuart Bartlett, Vijay Natraj, Yuk L. Yung","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-08-12T19:29:19Z","title":"Earth as an Exoplanet: A Two-dimensional Alien Map"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.04350","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":"sha256:74a41550dde6ac37b4734be25f2fc8824d99393c29290a09b00bf953f525ea69","target":"record","created_at":"2026-07-05T00:00:27Z","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":"231c6de70d0f212fd2cc2cadf27d384af9b6a14d8b459dd9adc573e224f21019","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-08-12T19:29:19Z","title_canon_sha256":"44598013206c4cb3d3409f82617b7d8fa8804da12953a7c619b56ab99fde6e19"},"schema_version":"1.0","source":{"id":"1908.04350","kind":"arxiv","version":1}},"canonical_sha256":"d5346327f3ce8a6c3f519493d1026ac80b08dd220b2aa45852cc8b1e034911be","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d5346327f3ce8a6c3f519493d1026ac80b08dd220b2aa45852cc8b1e034911be","first_computed_at":"2026-07-05T00:00:27.764494Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:00:27.764494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Yk9JPAr3iRDsmP8fDRDQDwd92iPGgXE+ajFNzRIRjDjXKxAgClfaMV+h0/cTbWAIFfsPEtoYnw4L1BVCiW5WBA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:00:27.764996Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.04350","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:74a41550dde6ac37b4734be25f2fc8824d99393c29290a09b00bf953f525ea69","sha256:8fb2cecf1fc316984885d38153a3442d17965472072bf6bad1f85a1dcc80dbbc"],"state_sha256":"c2ed4fd2bcc3e5441e1c1c174455aedc161b1e1dc7b5f97ad6549f1c2501e8c6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V+1NwsBBSCt7M/rFPCc2fj3aIThaUQZbUOVRAhNegXkJECsIy6d6JJnT6sx2W6vkqcrkN8hTsA5eEox9mBUiDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T12:02:43.819231Z","bundle_sha256":"c9d2138a9d4898379362767ac6a30bf79e9d97c81c09731dd8e27b1a5db41300"}}