{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:TB74WW4Z466TCI3CTLQF445QDV","short_pith_number":"pith:TB74WW4Z","canonical_record":{"source":{"id":"2607.01121","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-01T16:08:46Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","gr-qc"],"title_canon_sha256":"9b7dc01148a42ecf55f1e2778293260df3fc3bf99b0931eb887e9406ae8b2185","abstract_canon_sha256":"cd3ccec36e2d719ca7fda533c40104c521707fe8d20b5bd146a396e89ae934e2"},"schema_version":"1.0"},"canonical_sha256":"987fcb5b99e7bd3123629ae05e73b01d77332c88df6ef7a7ed6e87a197e0c886","source":{"kind":"arxiv","id":"2607.01121","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.01121","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"arxiv_version","alias_value":"2607.01121v1","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.01121","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"pith_short_12","alias_value":"TB74WW4Z466T","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"pith_short_16","alias_value":"TB74WW4Z466TCI3C","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"pith_short_8","alias_value":"TB74WW4Z","created_at":"2026-07-02T01:18:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:TB74WW4Z466TCI3CTLQF445QDV","target":"record","payload":{"canonical_record":{"source":{"id":"2607.01121","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-01T16:08:46Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","gr-qc"],"title_canon_sha256":"9b7dc01148a42ecf55f1e2778293260df3fc3bf99b0931eb887e9406ae8b2185","abstract_canon_sha256":"cd3ccec36e2d719ca7fda533c40104c521707fe8d20b5bd146a396e89ae934e2"},"schema_version":"1.0"},"canonical_sha256":"987fcb5b99e7bd3123629ae05e73b01d77332c88df6ef7a7ed6e87a197e0c886","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-02T01:18:29.673507Z","signature_b64":"I8y6GGXe2VE1/oeAS7JcBTHqel0zxJFQgfGxVeBhzdlF61724l0Y8Zcm26NojAOK8NDi4ckHB11wyuAnwX9rBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"987fcb5b99e7bd3123629ae05e73b01d77332c88df6ef7a7ed6e87a197e0c886","last_reissued_at":"2026-07-02T01:18:29.673028Z","signature_status":"signed_v1","first_computed_at":"2026-07-02T01:18:29.673028Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.01121","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":"2026-07-02T01:18:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ydR+wsToMdGbKcTmKmj/lt/VONhc6yFNPJoah8yLv/HLUQz/1u4Ifrl9V5vZ5oDcoVSqWflKVteM0bGFmsnzAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-03T11:51:49.064370Z"},"content_sha256":"a9c4e4ffa58e60c570123cee9fd2664880a78fdad7c793bcb02dff975084027b","schema_version":"1.0","event_id":"sha256:a9c4e4ffa58e60c570123cee9fd2664880a78fdad7c793bcb02dff975084027b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:TB74WW4Z466TCI3CTLQF445QDV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Smoking-gun evidence for hierarchical black-hole mergers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA","gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Shao-Peng Tang, Yin-Jie Li, Yi-Zhong Fan, Yuan-Zhu Wang","submitted_at":"2026-07-01T16:08:46Z","abstract_excerpt":"How stellar-mass black holes grow after their birth is a central open question in astrophysics. Gravitational-wave observations have revealed a subpopulation of coalescing black holes with both high masses and high spins, but whether these properties arise from hierarchical mergers in dense stellar environments or from accretion onto isolated black holes has remained unresolved. Here, using a flexible mixture population model applied to the 259 binary black hole mergers in GWTC-5, we show that the mass function of the high-spin subpopulation traces, peak by peak, the predicted remnant-mass dis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.01121","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/2607.01121/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":"2026-07-02T01:18:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CKV5Hjdq4j2bb++hzU4bVxRZaKRPXy6FUzkd/tDKtSZSczZh/npqHNIIC1uPn8pEteI/rQSYeyzACdPskHkJBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-03T11:51:49.064755Z"},"content_sha256":"a0369dd2a9852ff72d412bb6062cec0b0edf0df505bbbe8743764eff3814be8e","schema_version":"1.0","event_id":"sha256:a0369dd2a9852ff72d412bb6062cec0b0edf0df505bbbe8743764eff3814be8e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TB74WW4Z466TCI3CTLQF445QDV/bundle.json","state_url":"https://pith.science/pith/TB74WW4Z466TCI3CTLQF445QDV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TB74WW4Z466TCI3CTLQF445QDV/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":"2026-07-03T11:51:49Z","links":{"resolver":"https://pith.science/pith/TB74WW4Z466TCI3CTLQF445QDV","bundle":"https://pith.science/pith/TB74WW4Z466TCI3CTLQF445QDV/bundle.json","state":"https://pith.science/pith/TB74WW4Z466TCI3CTLQF445QDV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TB74WW4Z466TCI3CTLQF445QDV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:TB74WW4Z466TCI3CTLQF445QDV","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":"cd3ccec36e2d719ca7fda533c40104c521707fe8d20b5bd146a396e89ae934e2","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-01T16:08:46Z","title_canon_sha256":"9b7dc01148a42ecf55f1e2778293260df3fc3bf99b0931eb887e9406ae8b2185"},"schema_version":"1.0","source":{"id":"2607.01121","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.01121","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"arxiv_version","alias_value":"2607.01121v1","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.01121","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"pith_short_12","alias_value":"TB74WW4Z466T","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"pith_short_16","alias_value":"TB74WW4Z466TCI3C","created_at":"2026-07-02T01:18:29Z"},{"alias_kind":"pith_short_8","alias_value":"TB74WW4Z","created_at":"2026-07-02T01:18:29Z"}],"graph_snapshots":[{"event_id":"sha256:a0369dd2a9852ff72d412bb6062cec0b0edf0df505bbbe8743764eff3814be8e","target":"graph","created_at":"2026-07-02T01:18:29Z","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/2607.01121/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"How stellar-mass black holes grow after their birth is a central open question in astrophysics. Gravitational-wave observations have revealed a subpopulation of coalescing black holes with both high masses and high spins, but whether these properties arise from hierarchical mergers in dense stellar environments or from accretion onto isolated black holes has remained unresolved. Here, using a flexible mixture population model applied to the 259 binary black hole mergers in GWTC-5, we show that the mass function of the high-spin subpopulation traces, peak by peak, the predicted remnant-mass dis","authors_text":"Shao-Peng Tang, Yin-Jie Li, Yi-Zhong Fan, Yuan-Zhu Wang","cross_cats":["astro-ph.CO","astro-ph.GA","gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-01T16:08:46Z","title":"Smoking-gun evidence for hierarchical black-hole mergers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.01121","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:a9c4e4ffa58e60c570123cee9fd2664880a78fdad7c793bcb02dff975084027b","target":"record","created_at":"2026-07-02T01:18:29Z","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":"cd3ccec36e2d719ca7fda533c40104c521707fe8d20b5bd146a396e89ae934e2","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-01T16:08:46Z","title_canon_sha256":"9b7dc01148a42ecf55f1e2778293260df3fc3bf99b0931eb887e9406ae8b2185"},"schema_version":"1.0","source":{"id":"2607.01121","kind":"arxiv","version":1}},"canonical_sha256":"987fcb5b99e7bd3123629ae05e73b01d77332c88df6ef7a7ed6e87a197e0c886","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"987fcb5b99e7bd3123629ae05e73b01d77332c88df6ef7a7ed6e87a197e0c886","first_computed_at":"2026-07-02T01:18:29.673028Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-02T01:18:29.673028Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"I8y6GGXe2VE1/oeAS7JcBTHqel0zxJFQgfGxVeBhzdlF61724l0Y8Zcm26NojAOK8NDi4ckHB11wyuAnwX9rBQ==","signature_status":"signed_v1","signed_at":"2026-07-02T01:18:29.673507Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.01121","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a9c4e4ffa58e60c570123cee9fd2664880a78fdad7c793bcb02dff975084027b","sha256:a0369dd2a9852ff72d412bb6062cec0b0edf0df505bbbe8743764eff3814be8e"],"state_sha256":"8b76e456452f2c9a809691bb3c2ea3dd5957f12d01ceaa9ccb42a960d9381bb8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NBcGr1AX79l1MLKK3ENDyB3BfEz6V4ALu1dsF4IG7/JJ0MlgampSyEgYUU+GbnJNQytXwAOyL7Z24RnLifXlDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-03T11:51:49.066831Z","bundle_sha256":"a06d5c42217a6f2ea38ed2b2ed925ffa8e820dcc6ae5b0619e98b9ba76361ad4"}}