{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:M4PUDGBPLQTWRQZV554BM56XC4","short_pith_number":"pith:M4PUDGBP","canonical_record":{"source":{"id":"1610.00802","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-04T00:11:09Z","cross_cats_sorted":[],"title_canon_sha256":"4addeab5651ade3d174830ca73f967fb809b4438dcd115aaf5d3bb071c9239f9","abstract_canon_sha256":"90681cb3f1b5b71ab51e712de7a449c13dab6c293d948ae58a4671e290e96edc"},"schema_version":"1.0"},"canonical_sha256":"671f41982f5c2768c335ef781677d7171691b14818a45683441cc156684e655c","source":{"kind":"arxiv","id":"1610.00802","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.00802","created_at":"2026-05-18T00:53:30Z"},{"alias_kind":"arxiv_version","alias_value":"1610.00802v1","created_at":"2026-05-18T00:53:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.00802","created_at":"2026-05-18T00:53:30Z"},{"alias_kind":"pith_short_12","alias_value":"M4PUDGBPLQTW","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"M4PUDGBPLQTWRQZV","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"M4PUDGBP","created_at":"2026-05-18T12:30:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:M4PUDGBPLQTWRQZV554BM56XC4","target":"record","payload":{"canonical_record":{"source":{"id":"1610.00802","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-04T00:11:09Z","cross_cats_sorted":[],"title_canon_sha256":"4addeab5651ade3d174830ca73f967fb809b4438dcd115aaf5d3bb071c9239f9","abstract_canon_sha256":"90681cb3f1b5b71ab51e712de7a449c13dab6c293d948ae58a4671e290e96edc"},"schema_version":"1.0"},"canonical_sha256":"671f41982f5c2768c335ef781677d7171691b14818a45683441cc156684e655c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:53:30.056383Z","signature_b64":"NGFtfubDYcXb1lakL/FEV8g7ckMOHItOjQPGsfxQp1smCaYLTK3Oua9p9vcI4ydr3nKUgjhgwNm4vAvOf6NzBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"671f41982f5c2768c335ef781677d7171691b14818a45683441cc156684e655c","last_reissued_at":"2026-05-18T00:53:30.056033Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:53:30.056033Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.00802","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":"2026-05-18T00:53:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CS2bV3VNT+pDBAcEKs9Ac15267cDsPrDVHXPei7iZ3YK4LArdfcJ5C0nsZmVk+eCnonooQet10Q6W4Y3uKjLBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T09:55:44.770511Z"},"content_sha256":"8b4b6c20023da70bf56d58ed58b9eb6075b34327a3d4ae528322abd88e957adc","schema_version":"1.0","event_id":"sha256:8b4b6c20023da70bf56d58ed58b9eb6075b34327a3d4ae528322abd88e957adc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:M4PUDGBPLQTWRQZV554BM56XC4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Detection of Water and/or Hydroxyl on Asteroid (16) Psyche","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Driss Takir, Joshua Emery, Juan Sanchez, Michael K. Shepard, Vishnu Reddy","submitted_at":"2016-10-04T00:11:09Z","abstract_excerpt":"In order to search for evidence of hydration on M-type asteroid (16) Psyche, we observed this object in the 3 micron spectral region using the long-wavelength cross-dispersed (LXD: 1.9-4.2 micron) mode of the SpeX spectrograph/imager at the NASA Infrared Telescope Facility (IRTF). Our observations show that Psyche exhibits a 3 micron absorption feature, attributed to water or hydroxyl. The 3 micron absorption feature is consistent with the hydration features found on the surfaces of water-rich asteroids, attributed to OH- and/or H2O-bearing phases (phyllosilicates). The detection of a 3 micron"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.00802","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":"2026-05-18T00:53:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qoNAqPswHMH05+BvoV2HQilLvPzEDzf0e3S+xOpmu9WHO3Hy4kW5jPUWD2lqJpUr4cNTxtoSBOkZwznoe3H8Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T09:55:44.771200Z"},"content_sha256":"55e4ff9b28be9b6c7fcaa4d8a792fe970c823b82367691152ebd2c9220563e15","schema_version":"1.0","event_id":"sha256:55e4ff9b28be9b6c7fcaa4d8a792fe970c823b82367691152ebd2c9220563e15"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M4PUDGBPLQTWRQZV554BM56XC4/bundle.json","state_url":"https://pith.science/pith/M4PUDGBPLQTWRQZV554BM56XC4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M4PUDGBPLQTWRQZV554BM56XC4/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":"2026-06-10T09:55:44Z","links":{"resolver":"https://pith.science/pith/M4PUDGBPLQTWRQZV554BM56XC4","bundle":"https://pith.science/pith/M4PUDGBPLQTWRQZV554BM56XC4/bundle.json","state":"https://pith.science/pith/M4PUDGBPLQTWRQZV554BM56XC4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M4PUDGBPLQTWRQZV554BM56XC4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:M4PUDGBPLQTWRQZV554BM56XC4","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":"90681cb3f1b5b71ab51e712de7a449c13dab6c293d948ae58a4671e290e96edc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-04T00:11:09Z","title_canon_sha256":"4addeab5651ade3d174830ca73f967fb809b4438dcd115aaf5d3bb071c9239f9"},"schema_version":"1.0","source":{"id":"1610.00802","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.00802","created_at":"2026-05-18T00:53:30Z"},{"alias_kind":"arxiv_version","alias_value":"1610.00802v1","created_at":"2026-05-18T00:53:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.00802","created_at":"2026-05-18T00:53:30Z"},{"alias_kind":"pith_short_12","alias_value":"M4PUDGBPLQTW","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"M4PUDGBPLQTWRQZV","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"M4PUDGBP","created_at":"2026-05-18T12:30:29Z"}],"graph_snapshots":[{"event_id":"sha256:55e4ff9b28be9b6c7fcaa4d8a792fe970c823b82367691152ebd2c9220563e15","target":"graph","created_at":"2026-05-18T00:53:30Z","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":"In order to search for evidence of hydration on M-type asteroid (16) Psyche, we observed this object in the 3 micron spectral region using the long-wavelength cross-dispersed (LXD: 1.9-4.2 micron) mode of the SpeX spectrograph/imager at the NASA Infrared Telescope Facility (IRTF). Our observations show that Psyche exhibits a 3 micron absorption feature, attributed to water or hydroxyl. The 3 micron absorption feature is consistent with the hydration features found on the surfaces of water-rich asteroids, attributed to OH- and/or H2O-bearing phases (phyllosilicates). The detection of a 3 micron","authors_text":"Driss Takir, Joshua Emery, Juan Sanchez, Michael K. Shepard, Vishnu Reddy","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-04T00:11:09Z","title":"Detection of Water and/or Hydroxyl on Asteroid (16) Psyche"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.00802","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":"sha256:8b4b6c20023da70bf56d58ed58b9eb6075b34327a3d4ae528322abd88e957adc","target":"record","created_at":"2026-05-18T00:53:30Z","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":"90681cb3f1b5b71ab51e712de7a449c13dab6c293d948ae58a4671e290e96edc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-04T00:11:09Z","title_canon_sha256":"4addeab5651ade3d174830ca73f967fb809b4438dcd115aaf5d3bb071c9239f9"},"schema_version":"1.0","source":{"id":"1610.00802","kind":"arxiv","version":1}},"canonical_sha256":"671f41982f5c2768c335ef781677d7171691b14818a45683441cc156684e655c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"671f41982f5c2768c335ef781677d7171691b14818a45683441cc156684e655c","first_computed_at":"2026-05-18T00:53:30.056033Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:53:30.056033Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NGFtfubDYcXb1lakL/FEV8g7ckMOHItOjQPGsfxQp1smCaYLTK3Oua9p9vcI4ydr3nKUgjhgwNm4vAvOf6NzBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:53:30.056383Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.00802","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8b4b6c20023da70bf56d58ed58b9eb6075b34327a3d4ae528322abd88e957adc","sha256:55e4ff9b28be9b6c7fcaa4d8a792fe970c823b82367691152ebd2c9220563e15"],"state_sha256":"e01cdbf94e0dc9254fa9e2a56671b2f38dc27e81c1ecaf17d67d47345f06a163"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/3D91/cRROGARr55kyRjl09Nci0rTslMhOUVdxhhSh1O7GXCotDmVGF1ao0IKxwE8cwOw85SwNFPGa7wlY67AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T09:55:44.774873Z","bundle_sha256":"d545f2488eab4278af7d2091ce52d034a0678fb31eb35cc0287a2293e4f2addd"}}