{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:42EKSEXU4TI3SUCTP7HRZWDFEM","short_pith_number":"pith:42EKSEXU","canonical_record":{"source":{"id":"1407.0111","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-07-01T06:21:52Z","cross_cats_sorted":[],"title_canon_sha256":"efa95cd851918bcedc932f1a20f84e567afbc599f4707176feeec962f222da07","abstract_canon_sha256":"731e8dee54371fc8fe0df252b4d19eb2c5fded683c45593060b0d36a7ff21cce"},"schema_version":"1.0"},"canonical_sha256":"e688a912f4e4d1b950537fcf1cd8652310b351f6f10934b5149850ede672ef5e","source":{"kind":"arxiv","id":"1407.0111","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.0111","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"arxiv_version","alias_value":"1407.0111v1","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.0111","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"pith_short_12","alias_value":"42EKSEXU4TI3","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_16","alias_value":"42EKSEXU4TI3SUCT","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_8","alias_value":"42EKSEXU","created_at":"2026-05-18T12:28:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:42EKSEXU4TI3SUCTP7HRZWDFEM","target":"record","payload":{"canonical_record":{"source":{"id":"1407.0111","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-07-01T06:21:52Z","cross_cats_sorted":[],"title_canon_sha256":"efa95cd851918bcedc932f1a20f84e567afbc599f4707176feeec962f222da07","abstract_canon_sha256":"731e8dee54371fc8fe0df252b4d19eb2c5fded683c45593060b0d36a7ff21cce"},"schema_version":"1.0"},"canonical_sha256":"e688a912f4e4d1b950537fcf1cd8652310b351f6f10934b5149850ede672ef5e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:42:43.190889Z","signature_b64":"RLGIfBIOcZh39r8gnCb4diGMO6TbM6ZClLfsEsq+dX6YLqdab2Bo9unPNQ9TCtR5/jZKI8Gdz4Yj1Oatl6a0BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e688a912f4e4d1b950537fcf1cd8652310b351f6f10934b5149850ede672ef5e","last_reissued_at":"2026-05-18T01:42:43.190133Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:42:43.190133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.0111","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":"2026-05-18T01:42:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6PQLDYYgKqLtKSKEck/N9VhFk+qNQ620q/eqc08cgI63p8on39fPtmfp0B5c8Iq2QOwV3CmrxNuMJEnbZBfLBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T02:52:20.020732Z"},"content_sha256":"d68747df3ba2c6ebf63a6eaf8f5be59b2661a4c9cd559474a74c8a1a937990b3","schema_version":"1.0","event_id":"sha256:d68747df3ba2c6ebf63a6eaf8f5be59b2661a4c9cd559474a74c8a1a937990b3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:42EKSEXU4TI3SUCTP7HRZWDFEM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Interannual observations and quantification of summertime H2O ice deposition on the Martian CO2 ice south polar cap","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Adrian J. Brown, Sylvain Piqueux, Timothy N. Titus","submitted_at":"2014-07-01T06:21:52Z","abstract_excerpt":"The spectral signature of water ice was observed on Martian south polar cap in 2004 by the Observatoire pour l'Mineralogie, l'Eau les Glaces et l'Activite (OMEGA) (Bibring et al., 2004). Three years later, the OMEGA instrument was used to discover water ice deposited during southern summer on the polar cap (Langevin et al., 2007). However, temporal and spatial variations of these water ice signatures have remained unexplored, and the origins of these water deposits remains an important scientific question. To investigate this question, we have used observations from the Compact Reconnaissance "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.0111","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":"2026-05-18T01:42:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R5nye3faLM2pTss0x5l2iCs5jnQotBYk81B4nBJkj3Y02wPhXFTizExHerl9mVIpC2cc1EqF+VnifTB4xmMQDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T02:52:20.021090Z"},"content_sha256":"70e840a86dab897689e2243b8a5efab5b7c90a22966ca694be1a285d78517f58","schema_version":"1.0","event_id":"sha256:70e840a86dab897689e2243b8a5efab5b7c90a22966ca694be1a285d78517f58"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/42EKSEXU4TI3SUCTP7HRZWDFEM/bundle.json","state_url":"https://pith.science/pith/42EKSEXU4TI3SUCTP7HRZWDFEM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/42EKSEXU4TI3SUCTP7HRZWDFEM/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":"2026-06-04T02:52:20Z","links":{"resolver":"https://pith.science/pith/42EKSEXU4TI3SUCTP7HRZWDFEM","bundle":"https://pith.science/pith/42EKSEXU4TI3SUCTP7HRZWDFEM/bundle.json","state":"https://pith.science/pith/42EKSEXU4TI3SUCTP7HRZWDFEM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/42EKSEXU4TI3SUCTP7HRZWDFEM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:42EKSEXU4TI3SUCTP7HRZWDFEM","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":"731e8dee54371fc8fe0df252b4d19eb2c5fded683c45593060b0d36a7ff21cce","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-07-01T06:21:52Z","title_canon_sha256":"efa95cd851918bcedc932f1a20f84e567afbc599f4707176feeec962f222da07"},"schema_version":"1.0","source":{"id":"1407.0111","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.0111","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"arxiv_version","alias_value":"1407.0111v1","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.0111","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"pith_short_12","alias_value":"42EKSEXU4TI3","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_16","alias_value":"42EKSEXU4TI3SUCT","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_8","alias_value":"42EKSEXU","created_at":"2026-05-18T12:28:11Z"}],"graph_snapshots":[{"event_id":"sha256:70e840a86dab897689e2243b8a5efab5b7c90a22966ca694be1a285d78517f58","target":"graph","created_at":"2026-05-18T01:42:43Z","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":"The spectral signature of water ice was observed on Martian south polar cap in 2004 by the Observatoire pour l'Mineralogie, l'Eau les Glaces et l'Activite (OMEGA) (Bibring et al., 2004). Three years later, the OMEGA instrument was used to discover water ice deposited during southern summer on the polar cap (Langevin et al., 2007). However, temporal and spatial variations of these water ice signatures have remained unexplored, and the origins of these water deposits remains an important scientific question. To investigate this question, we have used observations from the Compact Reconnaissance ","authors_text":"Adrian J. Brown, Sylvain Piqueux, Timothy N. Titus","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-07-01T06:21:52Z","title":"Interannual observations and quantification of summertime H2O ice deposition on the Martian CO2 ice south polar cap"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.0111","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:d68747df3ba2c6ebf63a6eaf8f5be59b2661a4c9cd559474a74c8a1a937990b3","target":"record","created_at":"2026-05-18T01:42:43Z","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":"731e8dee54371fc8fe0df252b4d19eb2c5fded683c45593060b0d36a7ff21cce","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-07-01T06:21:52Z","title_canon_sha256":"efa95cd851918bcedc932f1a20f84e567afbc599f4707176feeec962f222da07"},"schema_version":"1.0","source":{"id":"1407.0111","kind":"arxiv","version":1}},"canonical_sha256":"e688a912f4e4d1b950537fcf1cd8652310b351f6f10934b5149850ede672ef5e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e688a912f4e4d1b950537fcf1cd8652310b351f6f10934b5149850ede672ef5e","first_computed_at":"2026-05-18T01:42:43.190133Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:42:43.190133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RLGIfBIOcZh39r8gnCb4diGMO6TbM6ZClLfsEsq+dX6YLqdab2Bo9unPNQ9TCtR5/jZKI8Gdz4Yj1Oatl6a0BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:42:43.190889Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.0111","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d68747df3ba2c6ebf63a6eaf8f5be59b2661a4c9cd559474a74c8a1a937990b3","sha256:70e840a86dab897689e2243b8a5efab5b7c90a22966ca694be1a285d78517f58"],"state_sha256":"d5b2a132dc0805d8e08d1c301f125ce60582296ba1f735b3a00f57aacd34ce40"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qdqs9ZrmaB/pZLV/Na+14u+uBvuNHsjHswE5t5fcETg5B6NLL/NWo84YCiJkplsJ7ys85dxMRZSUK9GSDu61Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T02:52:20.023405Z","bundle_sha256":"f9a9f4f06c907b73630730ca3424b310c7dfe2658438cee6d7cd1dd667bb2911"}}