{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:OL6BUN5OWD5OYFOXHE2NPRRDXJ","short_pith_number":"pith:OL6BUN5O","canonical_record":{"source":{"id":"2009.13505","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-28T17:55:28Z","cross_cats_sorted":[],"title_canon_sha256":"1ca8c883e978f467b48136fa21f6f3eab291df0d9122a9135ccc1716244dbf28","abstract_canon_sha256":"cef8248c7daa0e04d2f3cbf84fd09e49b673cfd02fd8970a46383f8fa1f7aaec"},"schema_version":"1.0"},"canonical_sha256":"72fc1a37aeb0faec15d73934d7c623ba5ca2a55dc5af5a3754462865c183ba6e","source":{"kind":"arxiv","id":"2009.13505","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.13505","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"arxiv_version","alias_value":"2009.13505v2","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.13505","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"pith_short_12","alias_value":"OL6BUN5OWD5O","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"pith_short_16","alias_value":"OL6BUN5OWD5OYFOX","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"pith_short_8","alias_value":"OL6BUN5O","created_at":"2026-07-05T01:48:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:OL6BUN5OWD5OYFOXHE2NPRRDXJ","target":"record","payload":{"canonical_record":{"source":{"id":"2009.13505","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-28T17:55:28Z","cross_cats_sorted":[],"title_canon_sha256":"1ca8c883e978f467b48136fa21f6f3eab291df0d9122a9135ccc1716244dbf28","abstract_canon_sha256":"cef8248c7daa0e04d2f3cbf84fd09e49b673cfd02fd8970a46383f8fa1f7aaec"},"schema_version":"1.0"},"canonical_sha256":"72fc1a37aeb0faec15d73934d7c623ba5ca2a55dc5af5a3754462865c183ba6e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:48:55.704706Z","signature_b64":"HZRqwEKocCqvQxIht+UL+Uz8QOXhBzEcj15Z5/steKDjrsCAKRH+5sf8PgdoG0Cx0QDl+DustAhxgF+f2pdlDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"72fc1a37aeb0faec15d73934d7c623ba5ca2a55dc5af5a3754462865c183ba6e","last_reissued_at":"2026-07-05T01:48:55.704334Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:48:55.704334Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2009.13505","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":"2026-07-05T01:48:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wwERwq0X005nksUaI6HWIilANu//M0kNqOhUB7YnAddPyKWi+PssLLQzZyJDSEiveb3qoZ/2hOZ611CAC+wADg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T20:58:07.891978Z"},"content_sha256":"36b7f68676ecb7303e09c0273b02589c4c075fa214eda37af9de22d7c8bd2cf2","schema_version":"1.0","event_id":"sha256:36b7f68676ecb7303e09c0273b02589c4c075fa214eda37af9de22d7c8bd2cf2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:OL6BUN5OWD5OYFOXHE2NPRRDXJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The mass assembly of high-redshift black holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Marta Volonteri, Olmo Piana, Pratika Dayal, Tirthankar Roy Choudhury","submitted_at":"2020-09-28T17:55:28Z","abstract_excerpt":"We use the Delphi semi-analytic model to study the mass assembly and properties of high-redshift ($z>4$) black holes over a wide mass range, $10^3 < M_{bh}/M_\\odot < 10^{10}$. Our black hole growth implementation includes a critical halo mass ($M_{h}^{crit}$) below which the black hole is starved and above which it is allowed to grow either at the Eddington limit or proportionally to the gas content of the galaxy. As a consequence, after an initial growth phase dominated by black hole mergers down to $z \\sim 7 (9)$, supermassive black holes in $z=4$ halo masses of $M_h|_{z=4} \\sim 10^{11.75} ~"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.13505","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/2009.13505/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":"2026-07-05T01:48:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GA6fWg8Bq+r/HdP+9yTAFzwwgLRbTo2/43Yrzzf0+JczhrY2dO9E33bJ9LofAWOTBGPq3Ge9z8GK2aCN32qLBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T20:58:07.893365Z"},"content_sha256":"b1542ffd58c91cafc5110984574f4f14903466f249fe6c40db449b42b4af90b8","schema_version":"1.0","event_id":"sha256:b1542ffd58c91cafc5110984574f4f14903466f249fe6c40db449b42b4af90b8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OL6BUN5OWD5OYFOXHE2NPRRDXJ/bundle.json","state_url":"https://pith.science/pith/OL6BUN5OWD5OYFOXHE2NPRRDXJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OL6BUN5OWD5OYFOXHE2NPRRDXJ/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":"2026-08-13T20:58:07Z","links":{"resolver":"https://pith.science/pith/OL6BUN5OWD5OYFOXHE2NPRRDXJ","bundle":"https://pith.science/pith/OL6BUN5OWD5OYFOXHE2NPRRDXJ/bundle.json","state":"https://pith.science/pith/OL6BUN5OWD5OYFOXHE2NPRRDXJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OL6BUN5OWD5OYFOXHE2NPRRDXJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:OL6BUN5OWD5OYFOXHE2NPRRDXJ","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":"cef8248c7daa0e04d2f3cbf84fd09e49b673cfd02fd8970a46383f8fa1f7aaec","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-28T17:55:28Z","title_canon_sha256":"1ca8c883e978f467b48136fa21f6f3eab291df0d9122a9135ccc1716244dbf28"},"schema_version":"1.0","source":{"id":"2009.13505","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.13505","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"arxiv_version","alias_value":"2009.13505v2","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.13505","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"pith_short_12","alias_value":"OL6BUN5OWD5O","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"pith_short_16","alias_value":"OL6BUN5OWD5OYFOX","created_at":"2026-07-05T01:48:55Z"},{"alias_kind":"pith_short_8","alias_value":"OL6BUN5O","created_at":"2026-07-05T01:48:55Z"}],"graph_snapshots":[{"event_id":"sha256:b1542ffd58c91cafc5110984574f4f14903466f249fe6c40db449b42b4af90b8","target":"graph","created_at":"2026-07-05T01:48:55Z","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/2009.13505/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We use the Delphi semi-analytic model to study the mass assembly and properties of high-redshift ($z>4$) black holes over a wide mass range, $10^3 < M_{bh}/M_\\odot < 10^{10}$. Our black hole growth implementation includes a critical halo mass ($M_{h}^{crit}$) below which the black hole is starved and above which it is allowed to grow either at the Eddington limit or proportionally to the gas content of the galaxy. As a consequence, after an initial growth phase dominated by black hole mergers down to $z \\sim 7 (9)$, supermassive black holes in $z=4$ halo masses of $M_h|_{z=4} \\sim 10^{11.75} ~","authors_text":"Marta Volonteri, Olmo Piana, Pratika Dayal, Tirthankar Roy Choudhury","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-28T17:55:28Z","title":"The mass assembly of high-redshift black holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.13505","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":"sha256:36b7f68676ecb7303e09c0273b02589c4c075fa214eda37af9de22d7c8bd2cf2","target":"record","created_at":"2026-07-05T01:48:55Z","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":"cef8248c7daa0e04d2f3cbf84fd09e49b673cfd02fd8970a46383f8fa1f7aaec","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-28T17:55:28Z","title_canon_sha256":"1ca8c883e978f467b48136fa21f6f3eab291df0d9122a9135ccc1716244dbf28"},"schema_version":"1.0","source":{"id":"2009.13505","kind":"arxiv","version":2}},"canonical_sha256":"72fc1a37aeb0faec15d73934d7c623ba5ca2a55dc5af5a3754462865c183ba6e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"72fc1a37aeb0faec15d73934d7c623ba5ca2a55dc5af5a3754462865c183ba6e","first_computed_at":"2026-07-05T01:48:55.704334Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:48:55.704334Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HZRqwEKocCqvQxIht+UL+Uz8QOXhBzEcj15Z5/steKDjrsCAKRH+5sf8PgdoG0Cx0QDl+DustAhxgF+f2pdlDw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:48:55.704706Z","signed_message":"canonical_sha256_bytes"},"source_id":"2009.13505","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:36b7f68676ecb7303e09c0273b02589c4c075fa214eda37af9de22d7c8bd2cf2","sha256:b1542ffd58c91cafc5110984574f4f14903466f249fe6c40db449b42b4af90b8"],"state_sha256":"4e5af493ec3a642c350179a9168f9e135b4014894c9420ba25f43777789e05c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BpePMxffAkTiMY+bibLFup9/ExuoH8rJmm7/gU7dDauIvvqwi3kQPqcdIZpkKAh+tCdu0dI5ze02JCbsI3pPAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T20:58:07.918619Z","bundle_sha256":"71665a6ed5c725e85ef902fb7bbcc65bef02dd4cd1cdc0338d19fa55faba073a"}}