{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:XMYCSADGYV4HGZNOIUWRTU5K43","short_pith_number":"pith:XMYCSADG","canonical_record":{"source":{"id":"0903.4177","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-24T20:00:47Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"0f820470b02ce46ea4cd1d80ad37ffd2c9932a48fd6584734e45783ce1659b10","abstract_canon_sha256":"d6dba81ede03df1803c548b8aaeccddb1e2a204067ecf7da0f45934e5c802adc"},"schema_version":"1.0"},"canonical_sha256":"bb30290066c5787365ae452d19d3aae6c87291f83c3a190f497230b2d3bcaa14","source":{"kind":"arxiv","id":"0903.4177","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.4177","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"arxiv_version","alias_value":"0903.4177v2","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.4177","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"pith_short_12","alias_value":"XMYCSADGYV4H","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"pith_short_16","alias_value":"XMYCSADGYV4HGZNO","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"pith_short_8","alias_value":"XMYCSADG","created_at":"2026-07-04T17:18:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:XMYCSADGYV4HGZNOIUWRTU5K43","target":"record","payload":{"canonical_record":{"source":{"id":"0903.4177","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-24T20:00:47Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"0f820470b02ce46ea4cd1d80ad37ffd2c9932a48fd6584734e45783ce1659b10","abstract_canon_sha256":"d6dba81ede03df1803c548b8aaeccddb1e2a204067ecf7da0f45934e5c802adc"},"schema_version":"1.0"},"canonical_sha256":"bb30290066c5787365ae452d19d3aae6c87291f83c3a190f497230b2d3bcaa14","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:18:44.534215Z","signature_b64":"xD0mcEj4mw7Aw/1LHjoH9Hb41DHusSHs+T/7iqhxLw3gCl+GeWhwoRPBi2WPK5ajIOKWr0Kqoh1g9NUw1E+SCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bb30290066c5787365ae452d19d3aae6c87291f83c3a190f497230b2d3bcaa14","last_reissued_at":"2026-07-04T17:18:44.533845Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:18:44.533845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0903.4177","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T17:18:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SZX9Hi07EGp1bPu+KKJaBNGDqH4DiXNxHBrJ3TuAP2tCjx1abriSmCh+IaTzrzgAYLeFB23Q/Chr5LvPXPWaDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T23:56:11.174372Z"},"content_sha256":"53782ee3720a66a874f27f62acc61d873d84e6f1ae4f36d7a51e601bd6c5bdc4","schema_version":"1.0","event_id":"sha256:53782ee3720a66a874f27f62acc61d873d84e6f1ae4f36d7a51e601bd6c5bdc4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:XMYCSADGYV4HGZNOIUWRTU5K43","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observing gravitational waves from the first generation of black holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Alberto Sesana, Alberto Vecchio, Ilya Mandel, Jonathan Gair","submitted_at":"2009-03-24T20:00:47Z","abstract_excerpt":"The properties of the first generation of black-hole seeds trace and distinguish different models of formation of cosmic structure in the high-redshift universe. The observational challenge lies in identifying black holes in the mass range ~100-1000 solar masses at redshift z~10. The typical frequencies of gravitational waves produced by the coalescence of the first generation of light seed black-hole binaries fall in the gap between the spectral ranges of low-frequency space-borne detectors (e.g., LISA) and high-frequency ground-based detectors (e.g., LIGO, Virgo and GEO 600). As such, these "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.4177","kind":"arxiv","version":2},"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/0903.4177/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":"2026-07-04T17:18:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z+2P3ObifwME0MDmAcp+93+S3VewoHAFq9wD58WOJuEVxW/R8p9HkrlzhkawL5jB2WzAAjb3jW67FdeBq163BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T23:56:11.180012Z"},"content_sha256":"cbf462b3caf19cd825ccaa15c5958485d98ba8564bc34456ce38124d98b745c0","schema_version":"1.0","event_id":"sha256:cbf462b3caf19cd825ccaa15c5958485d98ba8564bc34456ce38124d98b745c0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XMYCSADGYV4HGZNOIUWRTU5K43/bundle.json","state_url":"https://pith.science/pith/XMYCSADGYV4HGZNOIUWRTU5K43/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XMYCSADGYV4HGZNOIUWRTU5K43/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":"2026-08-14T23:56:11Z","links":{"resolver":"https://pith.science/pith/XMYCSADGYV4HGZNOIUWRTU5K43","bundle":"https://pith.science/pith/XMYCSADGYV4HGZNOIUWRTU5K43/bundle.json","state":"https://pith.science/pith/XMYCSADGYV4HGZNOIUWRTU5K43/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XMYCSADGYV4HGZNOIUWRTU5K43/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:XMYCSADGYV4HGZNOIUWRTU5K43","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":"d6dba81ede03df1803c548b8aaeccddb1e2a204067ecf7da0f45934e5c802adc","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-24T20:00:47Z","title_canon_sha256":"0f820470b02ce46ea4cd1d80ad37ffd2c9932a48fd6584734e45783ce1659b10"},"schema_version":"1.0","source":{"id":"0903.4177","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.4177","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"arxiv_version","alias_value":"0903.4177v2","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.4177","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"pith_short_12","alias_value":"XMYCSADGYV4H","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"pith_short_16","alias_value":"XMYCSADGYV4HGZNO","created_at":"2026-07-04T17:18:44Z"},{"alias_kind":"pith_short_8","alias_value":"XMYCSADG","created_at":"2026-07-04T17:18:44Z"}],"graph_snapshots":[{"event_id":"sha256:cbf462b3caf19cd825ccaa15c5958485d98ba8564bc34456ce38124d98b745c0","target":"graph","created_at":"2026-07-04T17:18:44Z","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/0903.4177/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The properties of the first generation of black-hole seeds trace and distinguish different models of formation of cosmic structure in the high-redshift universe. The observational challenge lies in identifying black holes in the mass range ~100-1000 solar masses at redshift z~10. The typical frequencies of gravitational waves produced by the coalescence of the first generation of light seed black-hole binaries fall in the gap between the spectral ranges of low-frequency space-borne detectors (e.g., LISA) and high-frequency ground-based detectors (e.g., LIGO, Virgo and GEO 600). As such, these ","authors_text":"Alberto Sesana, Alberto Vecchio, Ilya Mandel, Jonathan Gair","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-24T20:00:47Z","title":"Observing gravitational waves from the first generation of black holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.4177","kind":"arxiv","version":2},"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":"sha256:53782ee3720a66a874f27f62acc61d873d84e6f1ae4f36d7a51e601bd6c5bdc4","target":"record","created_at":"2026-07-04T17:18:44Z","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":"d6dba81ede03df1803c548b8aaeccddb1e2a204067ecf7da0f45934e5c802adc","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-24T20:00:47Z","title_canon_sha256":"0f820470b02ce46ea4cd1d80ad37ffd2c9932a48fd6584734e45783ce1659b10"},"schema_version":"1.0","source":{"id":"0903.4177","kind":"arxiv","version":2}},"canonical_sha256":"bb30290066c5787365ae452d19d3aae6c87291f83c3a190f497230b2d3bcaa14","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bb30290066c5787365ae452d19d3aae6c87291f83c3a190f497230b2d3bcaa14","first_computed_at":"2026-07-04T17:18:44.533845Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:18:44.533845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xD0mcEj4mw7Aw/1LHjoH9Hb41DHusSHs+T/7iqhxLw3gCl+GeWhwoRPBi2WPK5ajIOKWr0Kqoh1g9NUw1E+SCA==","signature_status":"signed_v1","signed_at":"2026-07-04T17:18:44.534215Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.4177","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:53782ee3720a66a874f27f62acc61d873d84e6f1ae4f36d7a51e601bd6c5bdc4","sha256:cbf462b3caf19cd825ccaa15c5958485d98ba8564bc34456ce38124d98b745c0"],"state_sha256":"9c209f4a2ef77dbfc3bee329c6a7ea6a640d699d67c77311df61dbd151177c9a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mu4aLYEt211LyHv8ARcVqr8zibA6eVxvja+eXMSi1ynY93sQbQpc0QqddNm9iiU5BIdFaJ982hWOz18JgnU9Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T23:56:11.199588Z","bundle_sha256":"bd757ed1e04b87974e7396506d31ffbc231b0ce8cebe289a19ebd009176172a9"}}