{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:L5SW4TAK72YLFDBQR3UOO5Y6TS","short_pith_number":"pith:L5SW4TAK","canonical_record":{"source":{"id":"1202.5042","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2012-02-22T21:02:14Z","cross_cats_sorted":["astro-ph.EP","q-bio.BM"],"title_canon_sha256":"e182c7bacd4105d70c66657aeb71844d435021d41777497a81a8e38812699245","abstract_canon_sha256":"2fd2bfb5cd46d9392b427b0fecb6f4e9ec8636ee78f4a5bb1ee5176fdd7987cf"},"schema_version":"1.0"},"canonical_sha256":"5f656e4c0afeb0b28c308ee8e7771e9caaae369f130531e4489d34cee57e68d5","source":{"kind":"arxiv","id":"1202.5042","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.5042","created_at":"2026-05-18T01:58:20Z"},{"alias_kind":"arxiv_version","alias_value":"1202.5042v2","created_at":"2026-05-18T01:58:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.5042","created_at":"2026-05-18T01:58:20Z"},{"alias_kind":"pith_short_12","alias_value":"L5SW4TAK72YL","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"L5SW4TAK72YLFDBQ","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"L5SW4TAK","created_at":"2026-05-18T12:27:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:L5SW4TAK72YLFDBQR3UOO5Y6TS","target":"record","payload":{"canonical_record":{"source":{"id":"1202.5042","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2012-02-22T21:02:14Z","cross_cats_sorted":["astro-ph.EP","q-bio.BM"],"title_canon_sha256":"e182c7bacd4105d70c66657aeb71844d435021d41777497a81a8e38812699245","abstract_canon_sha256":"2fd2bfb5cd46d9392b427b0fecb6f4e9ec8636ee78f4a5bb1ee5176fdd7987cf"},"schema_version":"1.0"},"canonical_sha256":"5f656e4c0afeb0b28c308ee8e7771e9caaae369f130531e4489d34cee57e68d5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:20.563911Z","signature_b64":"SqIB3jx8fS0CnK1SHwgI3eFjUig1SsdNwK15aSCI2Fvj95fadlhzHpm3qrY/FfxWUdpBjM+UYmm5GjBtUP6uBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5f656e4c0afeb0b28c308ee8e7771e9caaae369f130531e4489d34cee57e68d5","last_reissued_at":"2026-05-18T01:58:20.563366Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:20.563366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1202.5042","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":"2026-05-18T01:58:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hAb9x2NJaqYaPnFabdJ7kQSLVOpoIehx2BDNpfpxfyaY8qwHk35K/5/3eu8zKRpbOb/Gid65M/kXXnhhOf1ECg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T23:04:15.009357Z"},"content_sha256":"f5ecdf24dd9d50c8a3b621d92cfb5d0da95375900cd983b3aeff73649b1897ed","schema_version":"1.0","event_id":"sha256:f5ecdf24dd9d50c8a3b621d92cfb5d0da95375900cd983b3aeff73649b1897ed"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:L5SW4TAK72YLFDBQR3UOO5Y6TS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"From Cosmos to Intelligent Life: The Four Ages of Astrobiology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP","q-bio.BM"],"primary_cat":"physics.pop-ph","authors_text":"Marcelo Gleiser","submitted_at":"2012-02-22T21:02:14Z","abstract_excerpt":"The history of life on Earth and in other potential life-bearing planetary platforms is deeply linked to the history of the universe. Since life as we know it relies on chemical elements forged in dying heavy stars, the universe needs to be old enough for stars to form and evolve. Current cosmological theory indicates that the universe is 13.7$\\pm 0.13$ billion years old and that the first stars formed hundreds of millions of years after the big bang. At least some stars formed with stable planetary systems wherein a set of biochemical reactions leading to life could have taken place. In this "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.5042","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":""},"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":"2026-05-18T01:58:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GOT8OXwnXaZnnfLOl7+kJt0VuzUM+hpUUUB+TfcsYZnvDUIYPNFKjPYyLm4YQynaBTVvGdNJAwVUkJTQ7eNODQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T23:04:15.010009Z"},"content_sha256":"10b01cc3414551d20a60d36314a6a1241fc975f04c11b2b4b321ffcf82e4451b","schema_version":"1.0","event_id":"sha256:10b01cc3414551d20a60d36314a6a1241fc975f04c11b2b4b321ffcf82e4451b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L5SW4TAK72YLFDBQR3UOO5Y6TS/bundle.json","state_url":"https://pith.science/pith/L5SW4TAK72YLFDBQR3UOO5Y6TS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L5SW4TAK72YLFDBQR3UOO5Y6TS/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":"2026-05-31T23:04:15Z","links":{"resolver":"https://pith.science/pith/L5SW4TAK72YLFDBQR3UOO5Y6TS","bundle":"https://pith.science/pith/L5SW4TAK72YLFDBQR3UOO5Y6TS/bundle.json","state":"https://pith.science/pith/L5SW4TAK72YLFDBQR3UOO5Y6TS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L5SW4TAK72YLFDBQR3UOO5Y6TS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:L5SW4TAK72YLFDBQR3UOO5Y6TS","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":"2fd2bfb5cd46d9392b427b0fecb6f4e9ec8636ee78f4a5bb1ee5176fdd7987cf","cross_cats_sorted":["astro-ph.EP","q-bio.BM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2012-02-22T21:02:14Z","title_canon_sha256":"e182c7bacd4105d70c66657aeb71844d435021d41777497a81a8e38812699245"},"schema_version":"1.0","source":{"id":"1202.5042","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.5042","created_at":"2026-05-18T01:58:20Z"},{"alias_kind":"arxiv_version","alias_value":"1202.5042v2","created_at":"2026-05-18T01:58:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.5042","created_at":"2026-05-18T01:58:20Z"},{"alias_kind":"pith_short_12","alias_value":"L5SW4TAK72YL","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"L5SW4TAK72YLFDBQ","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"L5SW4TAK","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:10b01cc3414551d20a60d36314a6a1241fc975f04c11b2b4b321ffcf82e4451b","target":"graph","created_at":"2026-05-18T01:58:20Z","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":"The history of life on Earth and in other potential life-bearing planetary platforms is deeply linked to the history of the universe. Since life as we know it relies on chemical elements forged in dying heavy stars, the universe needs to be old enough for stars to form and evolve. Current cosmological theory indicates that the universe is 13.7$\\pm 0.13$ billion years old and that the first stars formed hundreds of millions of years after the big bang. At least some stars formed with stable planetary systems wherein a set of biochemical reactions leading to life could have taken place. In this ","authors_text":"Marcelo Gleiser","cross_cats":["astro-ph.EP","q-bio.BM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2012-02-22T21:02:14Z","title":"From Cosmos to Intelligent Life: The Four Ages of Astrobiology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.5042","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:f5ecdf24dd9d50c8a3b621d92cfb5d0da95375900cd983b3aeff73649b1897ed","target":"record","created_at":"2026-05-18T01:58:20Z","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":"2fd2bfb5cd46d9392b427b0fecb6f4e9ec8636ee78f4a5bb1ee5176fdd7987cf","cross_cats_sorted":["astro-ph.EP","q-bio.BM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2012-02-22T21:02:14Z","title_canon_sha256":"e182c7bacd4105d70c66657aeb71844d435021d41777497a81a8e38812699245"},"schema_version":"1.0","source":{"id":"1202.5042","kind":"arxiv","version":2}},"canonical_sha256":"5f656e4c0afeb0b28c308ee8e7771e9caaae369f130531e4489d34cee57e68d5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f656e4c0afeb0b28c308ee8e7771e9caaae369f130531e4489d34cee57e68d5","first_computed_at":"2026-05-18T01:58:20.563366Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:20.563366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SqIB3jx8fS0CnK1SHwgI3eFjUig1SsdNwK15aSCI2Fvj95fadlhzHpm3qrY/FfxWUdpBjM+UYmm5GjBtUP6uBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:20.563911Z","signed_message":"canonical_sha256_bytes"},"source_id":"1202.5042","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f5ecdf24dd9d50c8a3b621d92cfb5d0da95375900cd983b3aeff73649b1897ed","sha256:10b01cc3414551d20a60d36314a6a1241fc975f04c11b2b4b321ffcf82e4451b"],"state_sha256":"6966c16706ac4a75b958a2eb0d2e234e415f8c75fe754de5b7b3a443c66ab32e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yRQvMKUxv3Z9Obj7O8uMe3g+8vmOyQCA0A1FnYA/LJMdG/8zC7XXqdbfijNHPEDg2PHYTHLQM5pnyWPmIjw5Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T23:04:15.012596Z","bundle_sha256":"749ceae1096ee96d8a3f2a609324ce51df545ac989c5812c3da93ce4b72d55ec"}}