{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:VE3LSUGEZNDTWYUDZXKVN6UA6X","short_pith_number":"pith:VE3LSUGE","canonical_record":{"source":{"id":"2109.10375","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-21T18:01:00Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"bf167ea524c523ee42890c1dde8c495ca7d32156ab6c8094bf214150667861c5","abstract_canon_sha256":"92a0d1f67b1c4b627d923bed5a0d30652dfead7b20b3509cbd231931cf6195c4"},"schema_version":"1.0"},"canonical_sha256":"a936b950c4cb473b6283cdd556fa80f5fa914c96fd9d5598b4439e3bed27727f","source":{"kind":"arxiv","id":"2109.10375","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.10375","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"arxiv_version","alias_value":"2109.10375v2","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.10375","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"pith_short_12","alias_value":"VE3LSUGEZNDT","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"pith_short_16","alias_value":"VE3LSUGEZNDTWYUD","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"pith_short_8","alias_value":"VE3LSUGE","created_at":"2026-07-05T04:22:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:VE3LSUGEZNDTWYUDZXKVN6UA6X","target":"record","payload":{"canonical_record":{"source":{"id":"2109.10375","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-21T18:01:00Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"bf167ea524c523ee42890c1dde8c495ca7d32156ab6c8094bf214150667861c5","abstract_canon_sha256":"92a0d1f67b1c4b627d923bed5a0d30652dfead7b20b3509cbd231931cf6195c4"},"schema_version":"1.0"},"canonical_sha256":"a936b950c4cb473b6283cdd556fa80f5fa914c96fd9d5598b4439e3bed27727f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:22:16.963584Z","signature_b64":"fNBE2f4MtzFOTtLikgdFCfFcsIz4Bwi5SeGadA3V0YQqvDI2HlrvokrF8vE0sS+bItCMr+4Agbxu4yOr0aidDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a936b950c4cb473b6283cdd556fa80f5fa914c96fd9d5598b4439e3bed27727f","last_reissued_at":"2026-07-05T04:22:16.963055Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:22:16.963055Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.10375","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":"2026-07-05T04:22:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I4Z0d/K08L68UMdYWizZzYyfbGdkOI9nueHDILM4fDo91PiVCCaX6efPdLBZhCt94TE6aX6KssflyXoNREafCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T19:55:48.683921Z"},"content_sha256":"a1b717d6bd122bd1de492af70b726b866d027150b6baa7d07e2070e4854fcb84","schema_version":"1.0","event_id":"sha256:a1b717d6bd122bd1de492af70b726b866d027150b6baa7d07e2070e4854fcb84"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:VE3LSUGEZNDTWYUDZXKVN6UA6X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.IM"],"primary_cat":"astro-ph.CO","authors_text":"Hy Trac, Ian Holst, Marcelo A. Alvarez, Nianyi Chen, Renyue Cen","submitted_at":"2021-09-21T18:01:00Z","abstract_excerpt":"The Abundance Matching Box for the Epoch of Reionization (AMBER) is a semi-numerical code for modeling the cosmic dawn. The new algorithm is not based on the excursion set formalism for reionization, but takes the novel approach of calculating the reionization-redshift field $z_\\mathrm{re}(\\boldsymbol{x})$ assuming that hydrogen gas encountering higher radiation intensity are photoionized earlier. Redshift values are assigned while matching the abundance of ionized mass according to a given mass-weighted ionization fraction $\\bar{x}_\\mathrm{i}(z)$. The code has the unique advantage of allowing"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.10375","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/2109.10375/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":"2026-07-05T04:22:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FdMZRMCgWTI5X1wVNJTJ6bETBO/rBElQzftjMLB1yaMFZPiatLurNzmQGcGLNdxsOqo1aLkk6QE/4q1TyqW3Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T19:55:48.684769Z"},"content_sha256":"ae140e73208f18612496043fb218c6c13e883fbca668a0cabc3093f98488a28a","schema_version":"1.0","event_id":"sha256:ae140e73208f18612496043fb218c6c13e883fbca668a0cabc3093f98488a28a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VE3LSUGEZNDTWYUDZXKVN6UA6X/bundle.json","state_url":"https://pith.science/pith/VE3LSUGEZNDTWYUDZXKVN6UA6X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VE3LSUGEZNDTWYUDZXKVN6UA6X/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":"2026-08-07T19:55:48Z","links":{"resolver":"https://pith.science/pith/VE3LSUGEZNDTWYUDZXKVN6UA6X","bundle":"https://pith.science/pith/VE3LSUGEZNDTWYUDZXKVN6UA6X/bundle.json","state":"https://pith.science/pith/VE3LSUGEZNDTWYUDZXKVN6UA6X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VE3LSUGEZNDTWYUDZXKVN6UA6X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:VE3LSUGEZNDTWYUDZXKVN6UA6X","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":"92a0d1f67b1c4b627d923bed5a0d30652dfead7b20b3509cbd231931cf6195c4","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-21T18:01:00Z","title_canon_sha256":"bf167ea524c523ee42890c1dde8c495ca7d32156ab6c8094bf214150667861c5"},"schema_version":"1.0","source":{"id":"2109.10375","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.10375","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"arxiv_version","alias_value":"2109.10375v2","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.10375","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"pith_short_12","alias_value":"VE3LSUGEZNDT","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"pith_short_16","alias_value":"VE3LSUGEZNDTWYUD","created_at":"2026-07-05T04:22:16Z"},{"alias_kind":"pith_short_8","alias_value":"VE3LSUGE","created_at":"2026-07-05T04:22:16Z"}],"graph_snapshots":[{"event_id":"sha256:ae140e73208f18612496043fb218c6c13e883fbca668a0cabc3093f98488a28a","target":"graph","created_at":"2026-07-05T04:22:16Z","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/2109.10375/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The Abundance Matching Box for the Epoch of Reionization (AMBER) is a semi-numerical code for modeling the cosmic dawn. The new algorithm is not based on the excursion set formalism for reionization, but takes the novel approach of calculating the reionization-redshift field $z_\\mathrm{re}(\\boldsymbol{x})$ assuming that hydrogen gas encountering higher radiation intensity are photoionized earlier. Redshift values are assigned while matching the abundance of ionized mass according to a given mass-weighted ionization fraction $\\bar{x}_\\mathrm{i}(z)$. The code has the unique advantage of allowing","authors_text":"Hy Trac, Ian Holst, Marcelo A. Alvarez, Nianyi Chen, Renyue Cen","cross_cats":["astro-ph.GA","astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-21T18:01:00Z","title":"AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.10375","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:a1b717d6bd122bd1de492af70b726b866d027150b6baa7d07e2070e4854fcb84","target":"record","created_at":"2026-07-05T04:22:16Z","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":"92a0d1f67b1c4b627d923bed5a0d30652dfead7b20b3509cbd231931cf6195c4","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-21T18:01:00Z","title_canon_sha256":"bf167ea524c523ee42890c1dde8c495ca7d32156ab6c8094bf214150667861c5"},"schema_version":"1.0","source":{"id":"2109.10375","kind":"arxiv","version":2}},"canonical_sha256":"a936b950c4cb473b6283cdd556fa80f5fa914c96fd9d5598b4439e3bed27727f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a936b950c4cb473b6283cdd556fa80f5fa914c96fd9d5598b4439e3bed27727f","first_computed_at":"2026-07-05T04:22:16.963055Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:22:16.963055Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fNBE2f4MtzFOTtLikgdFCfFcsIz4Bwi5SeGadA3V0YQqvDI2HlrvokrF8vE0sS+bItCMr+4Agbxu4yOr0aidDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T04:22:16.963584Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.10375","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a1b717d6bd122bd1de492af70b726b866d027150b6baa7d07e2070e4854fcb84","sha256:ae140e73208f18612496043fb218c6c13e883fbca668a0cabc3093f98488a28a"],"state_sha256":"ee79d4c2ae34433eaa45a17ad2f93f72d3aa01a1cacbfdb4df6bd01af513d313"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3BRfJAHgjkfWAdlq4EgRt3tI8SxMdCOKhleBDdfzMJd1THaYlWvGegL41VuzJM9DS591wgygn0UvOmMhRIGWAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T19:55:48.689426Z","bundle_sha256":"18fe2768e17083c5d6038b5d002e9f6bf5e765823bd88ebdf51fb3b27ebef7e7"}}