{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:N3OT7XTIOWLIILAWA2P2ELHE4N","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":"815e9265ad17d003a24f56122e107b385ccbd5c2ae5344cdd8bfd8aeb56d204d","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-02T15:28:50Z","title_canon_sha256":"44a8f2ac97896853f10841fc35d1839c6c5f8755f0290dd534c13fc7b639ab53"},"schema_version":"1.0","source":{"id":"2606.03776","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.03776","created_at":"2026-06-03T02:06:02Z"},{"alias_kind":"arxiv_version","alias_value":"2606.03776v1","created_at":"2026-06-03T02:06:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.03776","created_at":"2026-06-03T02:06:02Z"},{"alias_kind":"pith_short_12","alias_value":"N3OT7XTIOWLI","created_at":"2026-06-03T02:06:02Z"},{"alias_kind":"pith_short_16","alias_value":"N3OT7XTIOWLIILAW","created_at":"2026-06-03T02:06:02Z"},{"alias_kind":"pith_short_8","alias_value":"N3OT7XTI","created_at":"2026-06-03T02:06:02Z"}],"graph_snapshots":[{"event_id":"sha256:9d4d8c1206b4bc9ca80997f4e49e41f9e6e7949765f5960db7b24df211a59b77","target":"graph","created_at":"2026-06-03T02:06:02Z","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/2606.03776/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Next-generation gravitational-wave detectors such as the Einstein Telescope and Cosmic Explorer will be able to detect binary black-hole mergers out to the cosmic dawn. Mergers observed in the local Universe represent a mixture of systems formed across the entire cosmic history, spanning a wide range of astrophysical environments. Iron-group elements govern metallicity effects on stellar evolution, making metallicity a key tracer that leaves a strong imprint on the black-hole population. We introduce the concept of a \"target\" redshift, $z_t$, defined as the epoch at which more than 90% of star","authors_text":"Davide Gerosa, Federico Leto di Priolo, Martyna Chru\\'sli\\'nska","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-02T15:28:50Z","title":"Targeting black holes from metal-poor progenitors with next-generation gravitational-wave detectors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.03776","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":"sha256:6c319cdfdd07aab80ed386ff5a999b768e48f3ddbd6d7c7fca3d6e2a2bdfe952","target":"record","created_at":"2026-06-03T02:06:02Z","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":"815e9265ad17d003a24f56122e107b385ccbd5c2ae5344cdd8bfd8aeb56d204d","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-02T15:28:50Z","title_canon_sha256":"44a8f2ac97896853f10841fc35d1839c6c5f8755f0290dd534c13fc7b639ab53"},"schema_version":"1.0","source":{"id":"2606.03776","kind":"arxiv","version":1}},"canonical_sha256":"6edd3fde687596842c16069fa22ce4e3627a1094a41cfd0e7942435ee56150f2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6edd3fde687596842c16069fa22ce4e3627a1094a41cfd0e7942435ee56150f2","first_computed_at":"2026-06-03T02:06:02.164784Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-03T02:06:02.164784Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EjdFJ4GPkLD5itY1iOi6giw/Sm8/te4A7QtWvXYz0dnEMl6llji72BWdl/vnAvUwOuNM2VyHzvVk84IeAg8aDg==","signature_status":"signed_v1","signed_at":"2026-06-03T02:06:02.165190Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.03776","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6c319cdfdd07aab80ed386ff5a999b768e48f3ddbd6d7c7fca3d6e2a2bdfe952","sha256:9d4d8c1206b4bc9ca80997f4e49e41f9e6e7949765f5960db7b24df211a59b77"],"state_sha256":"aa64c2eb0e2e06f3b624d12f26cacc4530b91be43f06ffe8ecf7fc2de2d16dac"}