{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:TD3PJRXAJTH7UKPNDQJNCY6KX2","short_pith_number":"pith:TD3PJRXA","canonical_record":{"source":{"id":"1310.4841","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2013-10-17T20:09:11Z","cross_cats_sorted":[],"title_canon_sha256":"24d9a58527cbae5e8508f8605d76a8214dfd0b724f16236262f0a1f0d2b08f65","abstract_canon_sha256":"1e39b4fb85ddeac4cc6981eba062658923fd9d9f0e2cc00588628966e71c0653"},"schema_version":"1.0"},"canonical_sha256":"98f6f4c6e04ccffa29ed1c12d163cabe828e8827aa56b03cfd6455d47146836b","source":{"kind":"arxiv","id":"1310.4841","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.4841","created_at":"2026-05-18T01:46:58Z"},{"alias_kind":"arxiv_version","alias_value":"1310.4841v1","created_at":"2026-05-18T01:46:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.4841","created_at":"2026-05-18T01:46:58Z"},{"alias_kind":"pith_short_12","alias_value":"TD3PJRXAJTH7","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_16","alias_value":"TD3PJRXAJTH7UKPN","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_8","alias_value":"TD3PJRXA","created_at":"2026-05-18T12:28:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:TD3PJRXAJTH7UKPNDQJNCY6KX2","target":"record","payload":{"canonical_record":{"source":{"id":"1310.4841","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2013-10-17T20:09:11Z","cross_cats_sorted":[],"title_canon_sha256":"24d9a58527cbae5e8508f8605d76a8214dfd0b724f16236262f0a1f0d2b08f65","abstract_canon_sha256":"1e39b4fb85ddeac4cc6981eba062658923fd9d9f0e2cc00588628966e71c0653"},"schema_version":"1.0"},"canonical_sha256":"98f6f4c6e04ccffa29ed1c12d163cabe828e8827aa56b03cfd6455d47146836b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:58.220877Z","signature_b64":"71ncXdTi4TPUcpnxNyOfnPIoi6f5qrFCixYvXBM4Rg9ZckJMWqERPdYKHHFpvEoVQiHrVlW1/caJ5jEfoe2XDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"98f6f4c6e04ccffa29ed1c12d163cabe828e8827aa56b03cfd6455d47146836b","last_reissued_at":"2026-05-18T01:46:58.220185Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:58.220185Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.4841","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":"2026-05-18T01:46:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KR93ZiRM5B2dtRPZwSwYFrmIAsxNrRqmiz+XEZivPpOH7/S+7huvMG2yTUx1DiCmnqfHWwLffJvJTJItAPi4Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T14:14:03.358855Z"},"content_sha256":"bc99a9c40948dba11c9d8a22f981890b00884445b0695fe5bcbe07f84a5420d7","schema_version":"1.0","event_id":"sha256:bc99a9c40948dba11c9d8a22f981890b00884445b0695fe5bcbe07f84a5420d7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:TD3PJRXAJTH7UKPNDQJNCY6KX2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Swansong Biospheres II: The final signs of life on terrestrial planets near the end of their habitable lifetimes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Charles S. Cockell, Jack T. O'Malley-James, Jane S. Greaves, John. A. Raven","submitted_at":"2013-10-17T20:09:11Z","abstract_excerpt":"The biosignatures of life on Earth do not remain static, but change considerably over the planet's habitable lifetime. Earth's future biosphere, much like that of the early Earth, will consist of predominantly unicellular microorganisms due to the increased hostility of environmental conditions caused by the Sun as it enters the late stage of its main sequence evolution. Building on previous work, the productivity of the biosphere is evaluated during different stages of biosphere decline between 1 Gyr and 2.8 Gyr from present. A simple atmosphere-biosphere interaction model is used to estimate"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.4841","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":"2026-05-18T01:46:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vPCs05PrFy0g0Vc6z780wKa7ydA+Uyp0cKJidTNeHmD2kQWL9t+KZ7fqAODL7URMAsbq8uaHl4WHV7chnCJmDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T14:14:03.359245Z"},"content_sha256":"64b3b316ca454b8f499bbe01155a9f9333779cc5f4195d16efd515926862413d","schema_version":"1.0","event_id":"sha256:64b3b316ca454b8f499bbe01155a9f9333779cc5f4195d16efd515926862413d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TD3PJRXAJTH7UKPNDQJNCY6KX2/bundle.json","state_url":"https://pith.science/pith/TD3PJRXAJTH7UKPNDQJNCY6KX2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TD3PJRXAJTH7UKPNDQJNCY6KX2/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":"2026-05-26T14:14:03Z","links":{"resolver":"https://pith.science/pith/TD3PJRXAJTH7UKPNDQJNCY6KX2","bundle":"https://pith.science/pith/TD3PJRXAJTH7UKPNDQJNCY6KX2/bundle.json","state":"https://pith.science/pith/TD3PJRXAJTH7UKPNDQJNCY6KX2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TD3PJRXAJTH7UKPNDQJNCY6KX2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:TD3PJRXAJTH7UKPNDQJNCY6KX2","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":"1e39b4fb85ddeac4cc6981eba062658923fd9d9f0e2cc00588628966e71c0653","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2013-10-17T20:09:11Z","title_canon_sha256":"24d9a58527cbae5e8508f8605d76a8214dfd0b724f16236262f0a1f0d2b08f65"},"schema_version":"1.0","source":{"id":"1310.4841","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.4841","created_at":"2026-05-18T01:46:58Z"},{"alias_kind":"arxiv_version","alias_value":"1310.4841v1","created_at":"2026-05-18T01:46:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.4841","created_at":"2026-05-18T01:46:58Z"},{"alias_kind":"pith_short_12","alias_value":"TD3PJRXAJTH7","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_16","alias_value":"TD3PJRXAJTH7UKPN","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_8","alias_value":"TD3PJRXA","created_at":"2026-05-18T12:28:02Z"}],"graph_snapshots":[{"event_id":"sha256:64b3b316ca454b8f499bbe01155a9f9333779cc5f4195d16efd515926862413d","target":"graph","created_at":"2026-05-18T01:46:58Z","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 biosignatures of life on Earth do not remain static, but change considerably over the planet's habitable lifetime. Earth's future biosphere, much like that of the early Earth, will consist of predominantly unicellular microorganisms due to the increased hostility of environmental conditions caused by the Sun as it enters the late stage of its main sequence evolution. Building on previous work, the productivity of the biosphere is evaluated during different stages of biosphere decline between 1 Gyr and 2.8 Gyr from present. A simple atmosphere-biosphere interaction model is used to estimate","authors_text":"Charles S. Cockell, Jack T. O'Malley-James, Jane S. Greaves, John. A. Raven","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2013-10-17T20:09:11Z","title":"Swansong Biospheres II: The final signs of life on terrestrial planets near the end of their habitable lifetimes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.4841","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:bc99a9c40948dba11c9d8a22f981890b00884445b0695fe5bcbe07f84a5420d7","target":"record","created_at":"2026-05-18T01:46:58Z","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":"1e39b4fb85ddeac4cc6981eba062658923fd9d9f0e2cc00588628966e71c0653","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2013-10-17T20:09:11Z","title_canon_sha256":"24d9a58527cbae5e8508f8605d76a8214dfd0b724f16236262f0a1f0d2b08f65"},"schema_version":"1.0","source":{"id":"1310.4841","kind":"arxiv","version":1}},"canonical_sha256":"98f6f4c6e04ccffa29ed1c12d163cabe828e8827aa56b03cfd6455d47146836b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"98f6f4c6e04ccffa29ed1c12d163cabe828e8827aa56b03cfd6455d47146836b","first_computed_at":"2026-05-18T01:46:58.220185Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:46:58.220185Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"71ncXdTi4TPUcpnxNyOfnPIoi6f5qrFCixYvXBM4Rg9ZckJMWqERPdYKHHFpvEoVQiHrVlW1/caJ5jEfoe2XDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:46:58.220877Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.4841","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bc99a9c40948dba11c9d8a22f981890b00884445b0695fe5bcbe07f84a5420d7","sha256:64b3b316ca454b8f499bbe01155a9f9333779cc5f4195d16efd515926862413d"],"state_sha256":"0fa8d320aa6d8675415b4024c30b56c04ac910318b67d942648f2afd25dc93ff"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FZBzXMQhsOka2IVCsTouMIc3+PH4hztTh4lC67v414NcOY5YPQl90kjRbYmk7DhxJtCMHNo/09Z4OLaPbhF3AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T14:14:03.362379Z","bundle_sha256":"560988c2d94f0e3c597014831fd0b1c6c813deded56518abc7bab1405a7468db"}}