{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:WQ7WIUJYCWLWYNVXJLMIDSD67Y","short_pith_number":"pith:WQ7WIUJY","canonical_record":{"source":{"id":"astro-ph/0604367","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2006-04-18T15:13:19Z","cross_cats_sorted":[],"title_canon_sha256":"4405270de9f35937fd5cbf63d90388e85055d6bb35f4aaf8f12027f014376e92","abstract_canon_sha256":"31e626d5f40756378c5b5a0d5756035337e6844b928ae87bc1e6cbf29d6e623f"},"schema_version":"1.0"},"canonical_sha256":"b43f64513815976c36b74ad881c87efe10608536a9dc7ef92e2ec01e2ec1c86f","source":{"kind":"arxiv","id":"astro-ph/0604367","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0604367","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0604367v4","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0604367","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"pith_short_12","alias_value":"WQ7WIUJYCWLW","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"pith_short_16","alias_value":"WQ7WIUJYCWLWYNVX","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"pith_short_8","alias_value":"WQ7WIUJY","created_at":"2026-07-04T16:58:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:WQ7WIUJYCWLWYNVXJLMIDSD67Y","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0604367","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2006-04-18T15:13:19Z","cross_cats_sorted":[],"title_canon_sha256":"4405270de9f35937fd5cbf63d90388e85055d6bb35f4aaf8f12027f014376e92","abstract_canon_sha256":"31e626d5f40756378c5b5a0d5756035337e6844b928ae87bc1e6cbf29d6e623f"},"schema_version":"1.0"},"canonical_sha256":"b43f64513815976c36b74ad881c87efe10608536a9dc7ef92e2ec01e2ec1c86f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:58:36.680353Z","signature_b64":"/8s8i+WX3EcCPg2F6RCFp5L+Ph89a4WZXZQaz2+wFZAGBgSE8pXJAXh/5dzc/T9gjF19IT8bwemyU+RH3xKlCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b43f64513815976c36b74ad881c87efe10608536a9dc7ef92e2ec01e2ec1c86f","last_reissued_at":"2026-07-04T16:58:36.679846Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:58:36.679846Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0604367","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:58:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"f5erA0UpvQEkadJunhh86hWvW7GICFLNSQQzmvbs6A1Pr/CsjDUqMPBnVI+zLpSnTKetDZX4RjGrSsFBGR2TCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T06:53:49.614406Z"},"content_sha256":"a60de11e05a38082ed79cdfc82082c92c54535e42d0fa8ac509fc0ef02a0faab","schema_version":"1.0","event_id":"sha256:a60de11e05a38082ed79cdfc82082c92c54535e42d0fa8ac509fc0ef02a0faab"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:WQ7WIUJYCWLWYNVXJLMIDSD67Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two populations of metal-free stars in the early Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Thomas H. Greif, Volker Bromm","submitted_at":"2006-04-18T15:13:19Z","abstract_excerpt":"We construct star formation histories at redshifts z > 5 for two physically distinct populations of primordial, metal-free stars, motivated by theoretical and observational arguments that have hinted towards the existence of an intermediate stellar generation between Population III and Population I/II. Taking into account the cosmological parameters as recently revised by WMAP after three years of operation, we determine self-consistent reionization histories and discuss the resulting chemical enrichment from these early stellar generations. We find that the bulk of ionizing photons and heavy "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0604367","kind":"arxiv","version":4},"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/astro-ph/0604367/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":"2026-07-04T16:58:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tkTKDZGUgm/TKZRj1rokgqCI9cRx6befAPieaStgy8HMglaPH13mzFKhlDYgu8NYCR3RoAUbBXtqBA2MUlc3AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T06:53:49.615532Z"},"content_sha256":"0e3f688f217ffaeecd01f84565689be858e2d338fef2a56e2c058264c591663f","schema_version":"1.0","event_id":"sha256:0e3f688f217ffaeecd01f84565689be858e2d338fef2a56e2c058264c591663f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WQ7WIUJYCWLWYNVXJLMIDSD67Y/bundle.json","state_url":"https://pith.science/pith/WQ7WIUJYCWLWYNVXJLMIDSD67Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WQ7WIUJYCWLWYNVXJLMIDSD67Y/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":"2026-08-11T06:53:49Z","links":{"resolver":"https://pith.science/pith/WQ7WIUJYCWLWYNVXJLMIDSD67Y","bundle":"https://pith.science/pith/WQ7WIUJYCWLWYNVXJLMIDSD67Y/bundle.json","state":"https://pith.science/pith/WQ7WIUJYCWLWYNVXJLMIDSD67Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WQ7WIUJYCWLWYNVXJLMIDSD67Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:WQ7WIUJYCWLWYNVXJLMIDSD67Y","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":"31e626d5f40756378c5b5a0d5756035337e6844b928ae87bc1e6cbf29d6e623f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2006-04-18T15:13:19Z","title_canon_sha256":"4405270de9f35937fd5cbf63d90388e85055d6bb35f4aaf8f12027f014376e92"},"schema_version":"1.0","source":{"id":"astro-ph/0604367","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0604367","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0604367v4","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0604367","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"pith_short_12","alias_value":"WQ7WIUJYCWLW","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"pith_short_16","alias_value":"WQ7WIUJYCWLWYNVX","created_at":"2026-07-04T16:58:36Z"},{"alias_kind":"pith_short_8","alias_value":"WQ7WIUJY","created_at":"2026-07-04T16:58:36Z"}],"graph_snapshots":[{"event_id":"sha256:0e3f688f217ffaeecd01f84565689be858e2d338fef2a56e2c058264c591663f","target":"graph","created_at":"2026-07-04T16:58:36Z","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/astro-ph/0604367/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We construct star formation histories at redshifts z > 5 for two physically distinct populations of primordial, metal-free stars, motivated by theoretical and observational arguments that have hinted towards the existence of an intermediate stellar generation between Population III and Population I/II. Taking into account the cosmological parameters as recently revised by WMAP after three years of operation, we determine self-consistent reionization histories and discuss the resulting chemical enrichment from these early stellar generations. We find that the bulk of ionizing photons and heavy ","authors_text":"Thomas H. Greif, Volker Bromm","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2006-04-18T15:13:19Z","title":"Two populations of metal-free stars in the early Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0604367","kind":"arxiv","version":4},"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:a60de11e05a38082ed79cdfc82082c92c54535e42d0fa8ac509fc0ef02a0faab","target":"record","created_at":"2026-07-04T16:58:36Z","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":"31e626d5f40756378c5b5a0d5756035337e6844b928ae87bc1e6cbf29d6e623f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2006-04-18T15:13:19Z","title_canon_sha256":"4405270de9f35937fd5cbf63d90388e85055d6bb35f4aaf8f12027f014376e92"},"schema_version":"1.0","source":{"id":"astro-ph/0604367","kind":"arxiv","version":4}},"canonical_sha256":"b43f64513815976c36b74ad881c87efe10608536a9dc7ef92e2ec01e2ec1c86f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b43f64513815976c36b74ad881c87efe10608536a9dc7ef92e2ec01e2ec1c86f","first_computed_at":"2026-07-04T16:58:36.679846Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:58:36.679846Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/8s8i+WX3EcCPg2F6RCFp5L+Ph89a4WZXZQaz2+wFZAGBgSE8pXJAXh/5dzc/T9gjF19IT8bwemyU+RH3xKlCw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:58:36.680353Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0604367","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a60de11e05a38082ed79cdfc82082c92c54535e42d0fa8ac509fc0ef02a0faab","sha256:0e3f688f217ffaeecd01f84565689be858e2d338fef2a56e2c058264c591663f"],"state_sha256":"b81ecea291e59302d603355295c9b95bded1780773e68602e66b140474612200"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qF0Q+zURBt1d2oiEWrRByhKGhVICe6nNUxFEaC4FP97R2rXl6F7CifNEcWrQnBywZzfUAyrxec8JxqRtQpLWBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T06:53:49.621859Z","bundle_sha256":"dc001a4edf738af35b36c950a66b805238dbbde384d37edcb7276c6135f75a11"}}