{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:AJ6V5EI272VMTSSMVSNZV3O426","short_pith_number":"pith:AJ6V5EI2","canonical_record":{"source":{"id":"1909.02283","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-05T09:34:53Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"e7cf7fdf5318ee21fbf22e408dd0868dbfe20b8651d7f17c29bbce19fb2646f7","abstract_canon_sha256":"dac5295d7949d89bed951983e3c41ecdbf68c81fddc20e08a1368cd8e45c71ae"},"schema_version":"1.0"},"canonical_sha256":"027d5e911afeaac9ca4cac9b9aeddcd799fac15031acc853a98876491d629462","source":{"kind":"arxiv","id":"1909.02283","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.02283","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"arxiv_version","alias_value":"1909.02283v1","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.02283","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"pith_short_12","alias_value":"AJ6V5EI272VM","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"pith_short_16","alias_value":"AJ6V5EI272VMTSSM","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"pith_short_8","alias_value":"AJ6V5EI2","created_at":"2026-07-05T00:02:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:AJ6V5EI272VMTSSMVSNZV3O426","target":"record","payload":{"canonical_record":{"source":{"id":"1909.02283","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-05T09:34:53Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"e7cf7fdf5318ee21fbf22e408dd0868dbfe20b8651d7f17c29bbce19fb2646f7","abstract_canon_sha256":"dac5295d7949d89bed951983e3c41ecdbf68c81fddc20e08a1368cd8e45c71ae"},"schema_version":"1.0"},"canonical_sha256":"027d5e911afeaac9ca4cac9b9aeddcd799fac15031acc853a98876491d629462","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:02:32.585354Z","signature_b64":"nf9AxtjetQnhHPC/Z7LCrOkTJcGhFcxU9N9cgelPG5uDgaTxRSR1dz/FzDt99NzyuNSDCtwKU81UnU0PBop0Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"027d5e911afeaac9ca4cac9b9aeddcd799fac15031acc853a98876491d629462","last_reissued_at":"2026-07-05T00:02:32.584789Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:02:32.584789Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.02283","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":"2026-07-05T00:02:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2mYf1EMD2DfE2Btu5YEjTwrhMSQPgbqdf9FfaUzWAF22Bbux8dAKHPqC2vcSDW8Pjn9b54L2mCK/Kv3hvSx5Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T11:31:17.981675Z"},"content_sha256":"9d134eb75a1595320da3ee763617c2ab2231dccb7f894f62402b50e3aa7865b2","schema_version":"1.0","event_id":"sha256:9d134eb75a1595320da3ee763617c2ab2231dccb7f894f62402b50e3aa7865b2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:AJ6V5EI272VMTSSMVSNZV3O426","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A snapshot full-Stokes spectropolarimeter for detecting life on Earth","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.IM","authors_text":"Antoine Pommerol, Brice-Olivier Demory, C. H. Lucas Patty, Christoph U. Keller, Daphne M. Stam, David S. Doelman, Frans Snik, H. Jens Hoeijmakers, Jonas K\\\"uhn, Olivier Poch, Vidhya Pallichadath","submitted_at":"2019-09-05T09:34:53Z","abstract_excerpt":"We present the design of a point-and-shoot non-imaging full-Stokes spectropolarimeter dedicated to detecting life on Earth from an orbiting platform like the ISS. We specifically aim to map circular polarization in the spectral features of chlorophyll and other biopigments for our planet as a whole. These non-zero circular polarization signatures are caused by homochirality of the molecular and supramolecular configurations of organic matter, and are considered the most unambiguous biomarker. To achieve a fully solid-state snapshot design, we implement a novel spatial modulation that completel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.02283","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/1909.02283/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":"2026-07-05T00:02:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gpJg0KWDB+NtAYkIZtv5uveNOjvgZKxdPwEmLw4TVoNDRoqS5TCg8kxp4/X7HVP5t+2DLXGlzYS6+f3XHdKJAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T11:31:17.982641Z"},"content_sha256":"29bfef1b410855d2fd39c4cab7f1fe2edc65090b56be0cd00eb56ae74d910659","schema_version":"1.0","event_id":"sha256:29bfef1b410855d2fd39c4cab7f1fe2edc65090b56be0cd00eb56ae74d910659"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AJ6V5EI272VMTSSMVSNZV3O426/bundle.json","state_url":"https://pith.science/pith/AJ6V5EI272VMTSSMVSNZV3O426/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AJ6V5EI272VMTSSMVSNZV3O426/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":"2026-08-14T11:31:17Z","links":{"resolver":"https://pith.science/pith/AJ6V5EI272VMTSSMVSNZV3O426","bundle":"https://pith.science/pith/AJ6V5EI272VMTSSMVSNZV3O426/bundle.json","state":"https://pith.science/pith/AJ6V5EI272VMTSSMVSNZV3O426/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AJ6V5EI272VMTSSMVSNZV3O426/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:AJ6V5EI272VMTSSMVSNZV3O426","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":"dac5295d7949d89bed951983e3c41ecdbf68c81fddc20e08a1368cd8e45c71ae","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-05T09:34:53Z","title_canon_sha256":"e7cf7fdf5318ee21fbf22e408dd0868dbfe20b8651d7f17c29bbce19fb2646f7"},"schema_version":"1.0","source":{"id":"1909.02283","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.02283","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"arxiv_version","alias_value":"1909.02283v1","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.02283","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"pith_short_12","alias_value":"AJ6V5EI272VM","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"pith_short_16","alias_value":"AJ6V5EI272VMTSSM","created_at":"2026-07-05T00:02:32Z"},{"alias_kind":"pith_short_8","alias_value":"AJ6V5EI2","created_at":"2026-07-05T00:02:32Z"}],"graph_snapshots":[{"event_id":"sha256:29bfef1b410855d2fd39c4cab7f1fe2edc65090b56be0cd00eb56ae74d910659","target":"graph","created_at":"2026-07-05T00:02:32Z","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/1909.02283/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present the design of a point-and-shoot non-imaging full-Stokes spectropolarimeter dedicated to detecting life on Earth from an orbiting platform like the ISS. We specifically aim to map circular polarization in the spectral features of chlorophyll and other biopigments for our planet as a whole. These non-zero circular polarization signatures are caused by homochirality of the molecular and supramolecular configurations of organic matter, and are considered the most unambiguous biomarker. To achieve a fully solid-state snapshot design, we implement a novel spatial modulation that completel","authors_text":"Antoine Pommerol, Brice-Olivier Demory, C. H. Lucas Patty, Christoph U. Keller, Daphne M. Stam, David S. Doelman, Frans Snik, H. Jens Hoeijmakers, Jonas K\\\"uhn, Olivier Poch, Vidhya Pallichadath","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-05T09:34:53Z","title":"A snapshot full-Stokes spectropolarimeter for detecting life on Earth"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.02283","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":"sha256:9d134eb75a1595320da3ee763617c2ab2231dccb7f894f62402b50e3aa7865b2","target":"record","created_at":"2026-07-05T00:02:32Z","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":"dac5295d7949d89bed951983e3c41ecdbf68c81fddc20e08a1368cd8e45c71ae","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-05T09:34:53Z","title_canon_sha256":"e7cf7fdf5318ee21fbf22e408dd0868dbfe20b8651d7f17c29bbce19fb2646f7"},"schema_version":"1.0","source":{"id":"1909.02283","kind":"arxiv","version":1}},"canonical_sha256":"027d5e911afeaac9ca4cac9b9aeddcd799fac15031acc853a98876491d629462","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"027d5e911afeaac9ca4cac9b9aeddcd799fac15031acc853a98876491d629462","first_computed_at":"2026-07-05T00:02:32.584789Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:02:32.584789Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nf9AxtjetQnhHPC/Z7LCrOkTJcGhFcxU9N9cgelPG5uDgaTxRSR1dz/FzDt99NzyuNSDCtwKU81UnU0PBop0Cg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:02:32.585354Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.02283","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d134eb75a1595320da3ee763617c2ab2231dccb7f894f62402b50e3aa7865b2","sha256:29bfef1b410855d2fd39c4cab7f1fe2edc65090b56be0cd00eb56ae74d910659"],"state_sha256":"b255373d86839daf55bc2e7f2fa1d86e5eebe9d7e3079b55bb2f2a8a8f579b38"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"68Gm8adhc9BO0VQgFBZJOSNMYN4FmNgW2oWHCiPFQsDOMlYLfjOdq2/LNa0rkHZSvBfeU4vs9yT9a/EfbyxBCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T11:31:17.990577Z","bundle_sha256":"6c17936d91a6b3193c662738cb8ffb3a65994a035675be7abd413a67d8643fac"}}