{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:W3ZNQCWEGE5XB66S4PFMNR47PH","short_pith_number":"pith:W3ZNQCWE","canonical_record":{"source":{"id":"1002.4229","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-23T00:55:11Z","cross_cats_sorted":[],"title_canon_sha256":"7682c498e6b26ac368ae27637f2a29079b024cb6fe75146618a3326b308c4f3f","abstract_canon_sha256":"c419fcc8d061515d95f38cbdd302d10abbf3927daa82c8ff4fd62c66db9b10f9"},"schema_version":"1.0"},"canonical_sha256":"b6f2d80ac4313b70fbd2e3cac6c79f79faa7c6c5cfaec54ad0eb0e5eb37b38a1","source":{"kind":"arxiv","id":"1002.4229","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.4229","created_at":"2026-05-18T03:54:49Z"},{"alias_kind":"arxiv_version","alias_value":"1002.4229v1","created_at":"2026-05-18T03:54:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.4229","created_at":"2026-05-18T03:54:49Z"},{"alias_kind":"pith_short_12","alias_value":"W3ZNQCWEGE5X","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"W3ZNQCWEGE5XB66S","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"W3ZNQCWE","created_at":"2026-05-18T12:26:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:W3ZNQCWEGE5XB66S4PFMNR47PH","target":"record","payload":{"canonical_record":{"source":{"id":"1002.4229","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-23T00:55:11Z","cross_cats_sorted":[],"title_canon_sha256":"7682c498e6b26ac368ae27637f2a29079b024cb6fe75146618a3326b308c4f3f","abstract_canon_sha256":"c419fcc8d061515d95f38cbdd302d10abbf3927daa82c8ff4fd62c66db9b10f9"},"schema_version":"1.0"},"canonical_sha256":"b6f2d80ac4313b70fbd2e3cac6c79f79faa7c6c5cfaec54ad0eb0e5eb37b38a1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:54:49.623536Z","signature_b64":"yxudaLGFf5BOE89+sKS8L2bZ8mPLkMY+qwLOGpuLkfyl/zoEXTu2imkfWlZ3I0epfTgoo10onfSgy6zfebxLBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b6f2d80ac4313b70fbd2e3cac6c79f79faa7c6c5cfaec54ad0eb0e5eb37b38a1","last_reissued_at":"2026-05-18T03:54:49.622852Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:54:49.622852Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1002.4229","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:54:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VRemN86KyO3GsNk5fLixDXHBBbv002n4Mhg7rEkUfnLrZrCNKMubDZ/VoHZagBmA2Z+lUZ2GRzHuJIugCTYTDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T06:08:07.703993Z"},"content_sha256":"8ca1d78fe45b36f716e5f5f832e5c8eaf812f4d2bda436777e5833ca985a3683","schema_version":"1.0","event_id":"sha256:8ca1d78fe45b36f716e5f5f832e5c8eaf812f4d2bda436777e5833ca985a3683"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:W3ZNQCWEGE5XB66S4PFMNR47PH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Birthrates and delay times of Type Ia supernovae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Bo Wang, Yangping Luo, Yunkun Han, Zhanwen Han, Zhengwei Liu, Zhenxin Lei","submitted_at":"2010-02-23T00:55:11Z","abstract_excerpt":"Type Ia supernovae (SNe Ia) play an important role in diverse areas of astrophysics, from the chemical evolution of galaxies to observational cosmology. However, the nature of the progenitors of SNe Ia is still unclear. In this paper, according to a detailed binary population synthesis study, we obtained SN Ia birthrates and delay times from different progenitor models, and compared them with observations. We find that the Galactic SN Ia birthrate from the double-degenerate (DD) model is close to those inferred from observations, while the birthrate from the single-degenerate (SD) model accoun"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.4229","kind":"arxiv","version":1},"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":"2026-05-18T03:54:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rZbsjj0FXPrroKqK9cBwj2QtgGQAcq2Tt+Dg3ccxUcKmBpUyI3zQanRfU1b26cWww77M7qrj8rqcIWf6tDx2Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T06:08:07.704693Z"},"content_sha256":"6cc08701b317973856e96b98627a828b9657dda90daa4a411d0a617a2c52628b","schema_version":"1.0","event_id":"sha256:6cc08701b317973856e96b98627a828b9657dda90daa4a411d0a617a2c52628b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W3ZNQCWEGE5XB66S4PFMNR47PH/bundle.json","state_url":"https://pith.science/pith/W3ZNQCWEGE5XB66S4PFMNR47PH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W3ZNQCWEGE5XB66S4PFMNR47PH/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":"2026-06-03T06:08:07Z","links":{"resolver":"https://pith.science/pith/W3ZNQCWEGE5XB66S4PFMNR47PH","bundle":"https://pith.science/pith/W3ZNQCWEGE5XB66S4PFMNR47PH/bundle.json","state":"https://pith.science/pith/W3ZNQCWEGE5XB66S4PFMNR47PH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W3ZNQCWEGE5XB66S4PFMNR47PH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:W3ZNQCWEGE5XB66S4PFMNR47PH","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":"c419fcc8d061515d95f38cbdd302d10abbf3927daa82c8ff4fd62c66db9b10f9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-23T00:55:11Z","title_canon_sha256":"7682c498e6b26ac368ae27637f2a29079b024cb6fe75146618a3326b308c4f3f"},"schema_version":"1.0","source":{"id":"1002.4229","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.4229","created_at":"2026-05-18T03:54:49Z"},{"alias_kind":"arxiv_version","alias_value":"1002.4229v1","created_at":"2026-05-18T03:54:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.4229","created_at":"2026-05-18T03:54:49Z"},{"alias_kind":"pith_short_12","alias_value":"W3ZNQCWEGE5X","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"W3ZNQCWEGE5XB66S","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"W3ZNQCWE","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:6cc08701b317973856e96b98627a828b9657dda90daa4a411d0a617a2c52628b","target":"graph","created_at":"2026-05-18T03:54:49Z","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":"Type Ia supernovae (SNe Ia) play an important role in diverse areas of astrophysics, from the chemical evolution of galaxies to observational cosmology. However, the nature of the progenitors of SNe Ia is still unclear. In this paper, according to a detailed binary population synthesis study, we obtained SN Ia birthrates and delay times from different progenitor models, and compared them with observations. We find that the Galactic SN Ia birthrate from the double-degenerate (DD) model is close to those inferred from observations, while the birthrate from the single-degenerate (SD) model accoun","authors_text":"Bo Wang, Yangping Luo, Yunkun Han, Zhanwen Han, Zhengwei Liu, Zhenxin Lei","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-23T00:55:11Z","title":"Birthrates and delay times of Type Ia supernovae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.4229","kind":"arxiv","version":1},"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":"sha256:8ca1d78fe45b36f716e5f5f832e5c8eaf812f4d2bda436777e5833ca985a3683","target":"record","created_at":"2026-05-18T03:54:49Z","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":"c419fcc8d061515d95f38cbdd302d10abbf3927daa82c8ff4fd62c66db9b10f9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-23T00:55:11Z","title_canon_sha256":"7682c498e6b26ac368ae27637f2a29079b024cb6fe75146618a3326b308c4f3f"},"schema_version":"1.0","source":{"id":"1002.4229","kind":"arxiv","version":1}},"canonical_sha256":"b6f2d80ac4313b70fbd2e3cac6c79f79faa7c6c5cfaec54ad0eb0e5eb37b38a1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6f2d80ac4313b70fbd2e3cac6c79f79faa7c6c5cfaec54ad0eb0e5eb37b38a1","first_computed_at":"2026-05-18T03:54:49.622852Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:54:49.622852Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yxudaLGFf5BOE89+sKS8L2bZ8mPLkMY+qwLOGpuLkfyl/zoEXTu2imkfWlZ3I0epfTgoo10onfSgy6zfebxLBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:54:49.623536Z","signed_message":"canonical_sha256_bytes"},"source_id":"1002.4229","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8ca1d78fe45b36f716e5f5f832e5c8eaf812f4d2bda436777e5833ca985a3683","sha256:6cc08701b317973856e96b98627a828b9657dda90daa4a411d0a617a2c52628b"],"state_sha256":"fcef57f7fb4d408c0555091430e682df827ff324d011f3a64497e6c64200ccac"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6D5X8MrN+1wcSUL8wBxvQvviJNBdi54/p5boq/q0f+jH97qHUmz1+KHv9sn0E8qkmSWSoyZlCSmOS8CiaBFQDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T06:08:07.706814Z","bundle_sha256":"ee66d545601475143107d04f73a5aaccf6e372a63ec702ba8c8766a0b3fcd549"}}