{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:7UJETVCTFQNYRLEQAPURNQHG2G","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":"a8f15a97b56ca5d1c94e41ad5e98dffd59d5570222c94f3a3222cfdb7a04123e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-26T09:23:41Z","title_canon_sha256":"26cece54bd9063c7bb4cf6fc2273eaa0378cd84ddff0c047dca5eb5092db024e"},"schema_version":"1.0","source":{"id":"1508.06417","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.06417","created_at":"2026-05-18T01:28:03Z"},{"alias_kind":"arxiv_version","alias_value":"1508.06417v1","created_at":"2026-05-18T01:28:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.06417","created_at":"2026-05-18T01:28:03Z"},{"alias_kind":"pith_short_12","alias_value":"7UJETVCTFQNY","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"7UJETVCTFQNYRLEQ","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"7UJETVCT","created_at":"2026-05-18T12:29:10Z"}],"graph_snapshots":[{"event_id":"sha256:39bf1b8f8d0db56b349636645c9fd19dcc333d1ab8629df9371e617e96ea5bde","target":"graph","created_at":"2026-05-18T01:28:03Z","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":"Our present understanding of high-mass star formation still remains very schematic. In particular, it is not yet clear how much of the difference between low-mass and high-mass star formation occurs during the earliest star formation phases. The chemical characteristics of massive cold clumps, and the comparison with those of their low-mass counterparts, could provide crucial clues about the exact role that chemistry plays in differentiating the early phases of low-mass and high-mass star formation. Water, in particular, is a unique probe of physical and chemical conditions in star-forming reg","authors_text":"Carina M. Persson, Claudio Codella, Luca Olmi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-26T09:23:41Z","title":"Herschel-HIFI observations of H2O, NH3 and N2H+ toward high-mass starless and proto-stellar clumps identified by the Hi-GAL survey"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.06417","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:ddeb9bb1f802a42744c79653cf55d9ea069060fbe9d1ddcc0062b326ba40ceec","target":"record","created_at":"2026-05-18T01:28:03Z","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":"a8f15a97b56ca5d1c94e41ad5e98dffd59d5570222c94f3a3222cfdb7a04123e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-26T09:23:41Z","title_canon_sha256":"26cece54bd9063c7bb4cf6fc2273eaa0378cd84ddff0c047dca5eb5092db024e"},"schema_version":"1.0","source":{"id":"1508.06417","kind":"arxiv","version":1}},"canonical_sha256":"fd1249d4532c1b88ac9003e916c0e6d1a43827166c4b9edf14f1d965c3d28494","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fd1249d4532c1b88ac9003e916c0e6d1a43827166c4b9edf14f1d965c3d28494","first_computed_at":"2026-05-18T01:28:03.388597Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:28:03.388597Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TzDFMFUt8d/otevvBuKrm+KPJkjEUEUHr8bms41Y/qXNPkI7T3n0G1QdLD7yGCiDLoU4ttw9ckgykggTBKLbAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:28:03.389229Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.06417","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ddeb9bb1f802a42744c79653cf55d9ea069060fbe9d1ddcc0062b326ba40ceec","sha256:39bf1b8f8d0db56b349636645c9fd19dcc333d1ab8629df9371e617e96ea5bde"],"state_sha256":"496f196f29606c5956f89ba88cc99289c468fbd5f91d03f1f06c0dafd0424ee3"}