{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:NA73DANA3EDEVBKIGLJS5EPXBV","short_pith_number":"pith:NA73DANA","canonical_record":{"source":{"id":"1604.03092","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-11T19:56:50Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"bdf71f1932d19d0215354b8e2587b9b75830e14ee3aa53fb0b0a3cec4e8b3842","abstract_canon_sha256":"bb5d09ab48959279041d31d19c3dc97bd4fe2dc00566a559ffccb00e9b4ac7e3"},"schema_version":"1.0"},"canonical_sha256":"683fb181a0d9064a854832d32e91f70d5713f52d4da6721acd05ecaf6bcf213c","source":{"kind":"arxiv","id":"1604.03092","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.03092","created_at":"2026-05-18T01:17:21Z"},{"alias_kind":"arxiv_version","alias_value":"1604.03092v1","created_at":"2026-05-18T01:17:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.03092","created_at":"2026-05-18T01:17:21Z"},{"alias_kind":"pith_short_12","alias_value":"NA73DANA3EDE","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_16","alias_value":"NA73DANA3EDEVBKI","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_8","alias_value":"NA73DANA","created_at":"2026-05-18T12:30:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:NA73DANA3EDEVBKIGLJS5EPXBV","target":"record","payload":{"canonical_record":{"source":{"id":"1604.03092","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-11T19:56:50Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"bdf71f1932d19d0215354b8e2587b9b75830e14ee3aa53fb0b0a3cec4e8b3842","abstract_canon_sha256":"bb5d09ab48959279041d31d19c3dc97bd4fe2dc00566a559ffccb00e9b4ac7e3"},"schema_version":"1.0"},"canonical_sha256":"683fb181a0d9064a854832d32e91f70d5713f52d4da6721acd05ecaf6bcf213c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:17:21.486458Z","signature_b64":"SuWDZaG/c+Dh1RVQnfYPiRaMD9maHOCNi1cS7CjXEVTsCYL2+LYm1qQu6Bq4BP7gHLVyqU4mvSjebR8X/vSUDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"683fb181a0d9064a854832d32e91f70d5713f52d4da6721acd05ecaf6bcf213c","last_reissued_at":"2026-05-18T01:17:21.485845Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:17:21.485845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.03092","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":"2026-05-18T01:17:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iqlpBtpiVyOq658pdy9OqvQzwXy8Bl1ZoK4HkEyuFe9/Z5y7CDxxgMPN8UAhNYMu2TmDbFYR9FJVLCv/OcHUAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T11:57:49.138332Z"},"content_sha256":"848546d4f320e0918e341906c069287d158563141ad93b9c5b0a10ff278d0da2","schema_version":"1.0","event_id":"sha256:848546d4f320e0918e341906c069287d158563141ad93b9c5b0a10ff278d0da2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:NA73DANA3EDEVBKIGLJS5EPXBV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Circumstellar Debris and Pollution at White Dwarf Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"J. Farihi","submitted_at":"2016-04-11T19:56:50Z","abstract_excerpt":"Circumstellar disks of planetary debris are now known or suspected to closely orbit hundreds of white dwarf stars. To date, both data and theory support disks that are entirely contained within the preceding giant stellar radii, and hence must have been produced during the white dwarf phase. This picture is strengthened by the signature of material falling onto the pristine stellar surfaces; disks are always detected together with atmospheric heavy elements. The physical link between this debris and the white dwarf host abundances enables unique insight into the bulk chemistry of extrasolar pl"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.03092","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":"2026-05-18T01:17:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bGWS1/kfmq6efd8Dim9Dl0FZ333ZhhuLvcG1wLxW6IgYknWrf56JlW5p4SNAuT28A+8Gxf36PDpXrR7zxfaJBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T11:57:49.138687Z"},"content_sha256":"356066c62501892209a85012f5578c6ed574f9fb84d280ddb24cfd23dd5fd295","schema_version":"1.0","event_id":"sha256:356066c62501892209a85012f5578c6ed574f9fb84d280ddb24cfd23dd5fd295"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NA73DANA3EDEVBKIGLJS5EPXBV/bundle.json","state_url":"https://pith.science/pith/NA73DANA3EDEVBKIGLJS5EPXBV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NA73DANA3EDEVBKIGLJS5EPXBV/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":"2026-06-30T11:57:49Z","links":{"resolver":"https://pith.science/pith/NA73DANA3EDEVBKIGLJS5EPXBV","bundle":"https://pith.science/pith/NA73DANA3EDEVBKIGLJS5EPXBV/bundle.json","state":"https://pith.science/pith/NA73DANA3EDEVBKIGLJS5EPXBV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NA73DANA3EDEVBKIGLJS5EPXBV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:NA73DANA3EDEVBKIGLJS5EPXBV","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":"bb5d09ab48959279041d31d19c3dc97bd4fe2dc00566a559ffccb00e9b4ac7e3","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-11T19:56:50Z","title_canon_sha256":"bdf71f1932d19d0215354b8e2587b9b75830e14ee3aa53fb0b0a3cec4e8b3842"},"schema_version":"1.0","source":{"id":"1604.03092","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.03092","created_at":"2026-05-18T01:17:21Z"},{"alias_kind":"arxiv_version","alias_value":"1604.03092v1","created_at":"2026-05-18T01:17:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.03092","created_at":"2026-05-18T01:17:21Z"},{"alias_kind":"pith_short_12","alias_value":"NA73DANA3EDE","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_16","alias_value":"NA73DANA3EDEVBKI","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_8","alias_value":"NA73DANA","created_at":"2026-05-18T12:30:32Z"}],"graph_snapshots":[{"event_id":"sha256:356066c62501892209a85012f5578c6ed574f9fb84d280ddb24cfd23dd5fd295","target":"graph","created_at":"2026-05-18T01:17:21Z","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":"Circumstellar disks of planetary debris are now known or suspected to closely orbit hundreds of white dwarf stars. To date, both data and theory support disks that are entirely contained within the preceding giant stellar radii, and hence must have been produced during the white dwarf phase. This picture is strengthened by the signature of material falling onto the pristine stellar surfaces; disks are always detected together with atmospheric heavy elements. The physical link between this debris and the white dwarf host abundances enables unique insight into the bulk chemistry of extrasolar pl","authors_text":"J. Farihi","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-11T19:56:50Z","title":"Circumstellar Debris and Pollution at White Dwarf Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.03092","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":"sha256:848546d4f320e0918e341906c069287d158563141ad93b9c5b0a10ff278d0da2","target":"record","created_at":"2026-05-18T01:17:21Z","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":"bb5d09ab48959279041d31d19c3dc97bd4fe2dc00566a559ffccb00e9b4ac7e3","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-11T19:56:50Z","title_canon_sha256":"bdf71f1932d19d0215354b8e2587b9b75830e14ee3aa53fb0b0a3cec4e8b3842"},"schema_version":"1.0","source":{"id":"1604.03092","kind":"arxiv","version":1}},"canonical_sha256":"683fb181a0d9064a854832d32e91f70d5713f52d4da6721acd05ecaf6bcf213c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"683fb181a0d9064a854832d32e91f70d5713f52d4da6721acd05ecaf6bcf213c","first_computed_at":"2026-05-18T01:17:21.485845Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:17:21.485845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SuWDZaG/c+Dh1RVQnfYPiRaMD9maHOCNi1cS7CjXEVTsCYL2+LYm1qQu6Bq4BP7gHLVyqU4mvSjebR8X/vSUDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:17:21.486458Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.03092","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:848546d4f320e0918e341906c069287d158563141ad93b9c5b0a10ff278d0da2","sha256:356066c62501892209a85012f5578c6ed574f9fb84d280ddb24cfd23dd5fd295"],"state_sha256":"3b0e9d06326bca727f3f4fad1487ab0d041bbef50b4cc89d43a71d2347fb3845"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VKACseO+HpZxZlhnhVnWerL6TE14B9Fy+oKCFvfLpF6jT8UYnVyjtz7X1g2n1YhPpNyqr2uxFTuf93cxxCsMDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-30T11:57:49.140630Z","bundle_sha256":"0e7f79663ae27f27027858bb20a0299b4217e867724f2c1c67f0faf8a3aa201b"}}