{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:3FJS2VUWMQWBDZJROU525VP45V","short_pith_number":"pith:3FJS2VUW","canonical_record":{"source":{"id":"2607.05495","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-06T18:00:01Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"70de50f945fd7a45960b5a2e83a4edc55fe6b5837fcc1f5225021b4ac2ae2560","abstract_canon_sha256":"2d358e729ea6b41356998fe8f9b4ceb585c8cf426027b6600126137fb1f48203"},"schema_version":"1.0"},"canonical_sha256":"d9532d5696642c11e531753baed5fced5b1a6d81c49be3afb4c34795181bea66","source":{"kind":"arxiv","id":"2607.05495","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.05495","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"arxiv_version","alias_value":"2607.05495v1","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.05495","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"pith_short_12","alias_value":"3FJS2VUWMQWB","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"pith_short_16","alias_value":"3FJS2VUWMQWBDZJR","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"pith_short_8","alias_value":"3FJS2VUW","created_at":"2026-07-08T01:18:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:3FJS2VUWMQWBDZJROU525VP45V","target":"record","payload":{"canonical_record":{"source":{"id":"2607.05495","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-06T18:00:01Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"70de50f945fd7a45960b5a2e83a4edc55fe6b5837fcc1f5225021b4ac2ae2560","abstract_canon_sha256":"2d358e729ea6b41356998fe8f9b4ceb585c8cf426027b6600126137fb1f48203"},"schema_version":"1.0"},"canonical_sha256":"d9532d5696642c11e531753baed5fced5b1a6d81c49be3afb4c34795181bea66","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-08T01:18:11.927284Z","signature_b64":"AYlaN0Y1GWOjFownOcKD/F2W22+1xvyvAKiq2mo1Y7nvHAlPy+j0aZie54lZHq0WpnZ2oEBmQ+UoowKCo7sGDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d9532d5696642c11e531753baed5fced5b1a6d81c49be3afb4c34795181bea66","last_reissued_at":"2026-07-08T01:18:11.925636Z","signature_status":"signed_v1","first_computed_at":"2026-07-08T01:18:11.925636Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.05495","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":"2026-07-08T01:18:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eLbHzxe5hIcOIkj3wkyJmKXvf2xC1Ahx7zc2tTXsgtGlbRoNHU5HkNcYCddwK4fclQkzNVlinQjMggX/8dxWBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-12T03:47:02.070771Z"},"content_sha256":"5460f70b728d104668790f29d5d76488d7b9fa85e71de49976ca4119d722918b","schema_version":"1.0","event_id":"sha256:5460f70b728d104668790f29d5d76488d7b9fa85e71de49976ca4119d722918b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:3FJS2VUWMQWBDZJROU525VP45V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Formation of rotating supergiants via stellar mergers in dense clusters: Implications for black hole natal spins","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"Daichi Tsuna, Fulya K{\\i}ro\\u{g}lu, Ishaan Satish, Kyle Kremer, Shahed Shayan Aran","submitted_at":"2026-07-06T18:00:01Z","abstract_excerpt":"We investigate how massive stellar mergers in young star clusters imprint on black hole spin distributions and the broader implications for gravitational wave sources. The central hypothesis is that angular momentum transferred during stellar mergers substantially affects the spins of the merger products and resulting black holes, with some merger products evolving into collapsar-like objects that retain thick accretion disks that enable efficient spin up. This is in contrast to the more general expectation that black holes form with very small spins, having shed most of their envelope angular"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.05495","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/2607.05495/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":"2026-07-08T01:18:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V0kaxtKIQkmH7Otoq/TbujzAdV2GAe6xf9Injweika8Sop+UdfPihh2T8FRW3XfJO6gxMnuMomGPvcmefzvSAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-12T03:47:02.071210Z"},"content_sha256":"55d537186ec700eddffd8c31a908c17e36f6ec4bb14be66dea12c2156a85e1a1","schema_version":"1.0","event_id":"sha256:55d537186ec700eddffd8c31a908c17e36f6ec4bb14be66dea12c2156a85e1a1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3FJS2VUWMQWBDZJROU525VP45V/bundle.json","state_url":"https://pith.science/pith/3FJS2VUWMQWBDZJROU525VP45V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3FJS2VUWMQWBDZJROU525VP45V/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":"2026-07-12T03:47:02Z","links":{"resolver":"https://pith.science/pith/3FJS2VUWMQWBDZJROU525VP45V","bundle":"https://pith.science/pith/3FJS2VUWMQWBDZJROU525VP45V/bundle.json","state":"https://pith.science/pith/3FJS2VUWMQWBDZJROU525VP45V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3FJS2VUWMQWBDZJROU525VP45V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:3FJS2VUWMQWBDZJROU525VP45V","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":"2d358e729ea6b41356998fe8f9b4ceb585c8cf426027b6600126137fb1f48203","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-06T18:00:01Z","title_canon_sha256":"70de50f945fd7a45960b5a2e83a4edc55fe6b5837fcc1f5225021b4ac2ae2560"},"schema_version":"1.0","source":{"id":"2607.05495","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.05495","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"arxiv_version","alias_value":"2607.05495v1","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.05495","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"pith_short_12","alias_value":"3FJS2VUWMQWB","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"pith_short_16","alias_value":"3FJS2VUWMQWBDZJR","created_at":"2026-07-08T01:18:11Z"},{"alias_kind":"pith_short_8","alias_value":"3FJS2VUW","created_at":"2026-07-08T01:18:11Z"}],"graph_snapshots":[{"event_id":"sha256:55d537186ec700eddffd8c31a908c17e36f6ec4bb14be66dea12c2156a85e1a1","target":"graph","created_at":"2026-07-08T01:18:11Z","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/2607.05495/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We investigate how massive stellar mergers in young star clusters imprint on black hole spin distributions and the broader implications for gravitational wave sources. The central hypothesis is that angular momentum transferred during stellar mergers substantially affects the spins of the merger products and resulting black holes, with some merger products evolving into collapsar-like objects that retain thick accretion disks that enable efficient spin up. This is in contrast to the more general expectation that black holes form with very small spins, having shed most of their envelope angular","authors_text":"Daichi Tsuna, Fulya K{\\i}ro\\u{g}lu, Ishaan Satish, Kyle Kremer, Shahed Shayan Aran","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-06T18:00:01Z","title":"Formation of rotating supergiants via stellar mergers in dense clusters: Implications for black hole natal spins"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.05495","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":"sha256:5460f70b728d104668790f29d5d76488d7b9fa85e71de49976ca4119d722918b","target":"record","created_at":"2026-07-08T01:18:11Z","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":"2d358e729ea6b41356998fe8f9b4ceb585c8cf426027b6600126137fb1f48203","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-06T18:00:01Z","title_canon_sha256":"70de50f945fd7a45960b5a2e83a4edc55fe6b5837fcc1f5225021b4ac2ae2560"},"schema_version":"1.0","source":{"id":"2607.05495","kind":"arxiv","version":1}},"canonical_sha256":"d9532d5696642c11e531753baed5fced5b1a6d81c49be3afb4c34795181bea66","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d9532d5696642c11e531753baed5fced5b1a6d81c49be3afb4c34795181bea66","first_computed_at":"2026-07-08T01:18:11.925636Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-08T01:18:11.925636Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AYlaN0Y1GWOjFownOcKD/F2W22+1xvyvAKiq2mo1Y7nvHAlPy+j0aZie54lZHq0WpnZ2oEBmQ+UoowKCo7sGDA==","signature_status":"signed_v1","signed_at":"2026-07-08T01:18:11.927284Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.05495","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5460f70b728d104668790f29d5d76488d7b9fa85e71de49976ca4119d722918b","sha256:55d537186ec700eddffd8c31a908c17e36f6ec4bb14be66dea12c2156a85e1a1"],"state_sha256":"90e688ec0f32a61e94bbf623d5bdd0e54301c5061cc6a2f98e357c5a4872f5da"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yjqek9opvxo4ol5XokQkokml7OA2VN9w70mhL3ZPEfbnswuzTXGy0edR3LHWqulUmJ4mz0a2FDLkvQrIO7xEAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-12T03:47:02.073451Z","bundle_sha256":"5a6db950171b14f12fdc2fb67fdb02f2e4a0a63c218ee32f046718e02a3f1065"}}