{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:HHB25GXUSMYOTSH6GH2PFITZY7","short_pith_number":"pith:HHB25GXU","canonical_record":{"source":{"id":"1703.06869","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-03-20T17:53:12Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"deddbe032efb130a212fb06920749e0488ad540aa2c576085b5fe4fd75656a0c","abstract_canon_sha256":"36a63fc654b1b3ae3286987a3bc52d449985c0d7a4b9891838daffd07ce2a411"},"schema_version":"1.0"},"canonical_sha256":"39c3ae9af49330e9c8fe31f4f2a279c7ca36e6abc7ea3f9c2ab650b7a05516d2","source":{"kind":"arxiv","id":"1703.06869","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.06869","created_at":"2026-05-18T00:43:15Z"},{"alias_kind":"arxiv_version","alias_value":"1703.06869v3","created_at":"2026-05-18T00:43:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.06869","created_at":"2026-05-18T00:43:15Z"},{"alias_kind":"pith_short_12","alias_value":"HHB25GXUSMYO","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"HHB25GXUSMYOTSH6","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"HHB25GXU","created_at":"2026-05-18T12:31:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:HHB25GXUSMYOTSH6GH2PFITZY7","target":"record","payload":{"canonical_record":{"source":{"id":"1703.06869","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-03-20T17:53:12Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"deddbe032efb130a212fb06920749e0488ad540aa2c576085b5fe4fd75656a0c","abstract_canon_sha256":"36a63fc654b1b3ae3286987a3bc52d449985c0d7a4b9891838daffd07ce2a411"},"schema_version":"1.0"},"canonical_sha256":"39c3ae9af49330e9c8fe31f4f2a279c7ca36e6abc7ea3f9c2ab650b7a05516d2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:43:15.540832Z","signature_b64":"t9SQiUeveO80lXL7VyvkGBk7KG48L4RgbuZqZmHI6boe1ZOzmCdofwzNjrLoGRHswHa1BzguLk2En6HTIHzMBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"39c3ae9af49330e9c8fe31f4f2a279c7ca36e6abc7ea3f9c2ab650b7a05516d2","last_reissued_at":"2026-05-18T00:43:15.540124Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:43:15.540124Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1703.06869","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:43:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RjDXHRwKibfG5hzBulhkSztaGE6K8sazs/vFmXrcratSNJ/pSDax+q5M/Ns9q6TNq1qgjIOrHD1I8tiiNifUAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T18:16:48.533034Z"},"content_sha256":"a9a3f34dd0248a6564afaf71d4afc1a37e157ebddc274b53f4111c3c7249310b","schema_version":"1.0","event_id":"sha256:a9a3f34dd0248a6564afaf71d4afc1a37e157ebddc274b53f4111c3c7249310b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:HHB25GXUSMYOTSH6GH2PFITZY7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Are LIGO's Black Holes Made From Smaller Black Holes?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Ben Farr, Daniel E. Holz, Maya Fishbach","submitted_at":"2017-03-20T17:53:12Z","abstract_excerpt":"One proposed formation channel for stellar mass black holes (BHs) is through hierarchical mergers of smaller BHs. Repeated mergers between comparable mass BHs leave an imprint on the spin of the resulting BH, since the final BH spin is largely determined by the orbital angular momentum of the binary. We find that for stellar mass BHs forming hierarchically the distribution of spin magnitudes is universal, with a peak at $a \\sim 0.7$ and little support below $a \\sim 0.5$. We show that the spin distribution is robust against changes to the mass ratio of the merging binaries, the initial spin dis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.06869","kind":"arxiv","version":3},"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":"2026-05-18T00:43:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O5qaPr16BvQaKGQZTL7+I9FQKWKhCrNGGXYe2WMS2Jhb12UD9EYtobCXq1u5xHCr40FkFE0tYsRFzlHuIfSVAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T18:16:48.533810Z"},"content_sha256":"3f94ff74dd4c68b6fd546fe5be2f11b6d72541acbd03ae6ac1cdbd3b74f3eb6f","schema_version":"1.0","event_id":"sha256:3f94ff74dd4c68b6fd546fe5be2f11b6d72541acbd03ae6ac1cdbd3b74f3eb6f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HHB25GXUSMYOTSH6GH2PFITZY7/bundle.json","state_url":"https://pith.science/pith/HHB25GXUSMYOTSH6GH2PFITZY7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HHB25GXUSMYOTSH6GH2PFITZY7/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":"2026-05-31T18:16:48Z","links":{"resolver":"https://pith.science/pith/HHB25GXUSMYOTSH6GH2PFITZY7","bundle":"https://pith.science/pith/HHB25GXUSMYOTSH6GH2PFITZY7/bundle.json","state":"https://pith.science/pith/HHB25GXUSMYOTSH6GH2PFITZY7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HHB25GXUSMYOTSH6GH2PFITZY7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:HHB25GXUSMYOTSH6GH2PFITZY7","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":"36a63fc654b1b3ae3286987a3bc52d449985c0d7a4b9891838daffd07ce2a411","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-03-20T17:53:12Z","title_canon_sha256":"deddbe032efb130a212fb06920749e0488ad540aa2c576085b5fe4fd75656a0c"},"schema_version":"1.0","source":{"id":"1703.06869","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.06869","created_at":"2026-05-18T00:43:15Z"},{"alias_kind":"arxiv_version","alias_value":"1703.06869v3","created_at":"2026-05-18T00:43:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.06869","created_at":"2026-05-18T00:43:15Z"},{"alias_kind":"pith_short_12","alias_value":"HHB25GXUSMYO","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"HHB25GXUSMYOTSH6","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"HHB25GXU","created_at":"2026-05-18T12:31:18Z"}],"graph_snapshots":[{"event_id":"sha256:3f94ff74dd4c68b6fd546fe5be2f11b6d72541acbd03ae6ac1cdbd3b74f3eb6f","target":"graph","created_at":"2026-05-18T00:43:15Z","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":"One proposed formation channel for stellar mass black holes (BHs) is through hierarchical mergers of smaller BHs. Repeated mergers between comparable mass BHs leave an imprint on the spin of the resulting BH, since the final BH spin is largely determined by the orbital angular momentum of the binary. We find that for stellar mass BHs forming hierarchically the distribution of spin magnitudes is universal, with a peak at $a \\sim 0.7$ and little support below $a \\sim 0.5$. We show that the spin distribution is robust against changes to the mass ratio of the merging binaries, the initial spin dis","authors_text":"Ben Farr, Daniel E. Holz, Maya Fishbach","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-03-20T17:53:12Z","title":"Are LIGO's Black Holes Made From Smaller Black Holes?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.06869","kind":"arxiv","version":3},"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:a9a3f34dd0248a6564afaf71d4afc1a37e157ebddc274b53f4111c3c7249310b","target":"record","created_at":"2026-05-18T00:43:15Z","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":"36a63fc654b1b3ae3286987a3bc52d449985c0d7a4b9891838daffd07ce2a411","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-03-20T17:53:12Z","title_canon_sha256":"deddbe032efb130a212fb06920749e0488ad540aa2c576085b5fe4fd75656a0c"},"schema_version":"1.0","source":{"id":"1703.06869","kind":"arxiv","version":3}},"canonical_sha256":"39c3ae9af49330e9c8fe31f4f2a279c7ca36e6abc7ea3f9c2ab650b7a05516d2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"39c3ae9af49330e9c8fe31f4f2a279c7ca36e6abc7ea3f9c2ab650b7a05516d2","first_computed_at":"2026-05-18T00:43:15.540124Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:43:15.540124Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"t9SQiUeveO80lXL7VyvkGBk7KG48L4RgbuZqZmHI6boe1ZOzmCdofwzNjrLoGRHswHa1BzguLk2En6HTIHzMBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:43:15.540832Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.06869","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a9a3f34dd0248a6564afaf71d4afc1a37e157ebddc274b53f4111c3c7249310b","sha256:3f94ff74dd4c68b6fd546fe5be2f11b6d72541acbd03ae6ac1cdbd3b74f3eb6f"],"state_sha256":"7ff6d8121b85d3e95491be3228916a7d7b3d98a95626e045ca755a2b7c90f149"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RXcBDW1iDfC+rYB32JXUwoXr0duCLseJVPh1BUipgIDaTdcCxdZ//FJy9e0B3Tekfbed9JIwZ+VdtB0adgzRCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T18:16:48.538235Z","bundle_sha256":"31eea50474a4cbd806aa02e279a875dd0e9138f45f52f664bddd6dd1dcb88329"}}