{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:W2ASQVRJNR236WEB7JAZHMNZBE","short_pith_number":"pith:W2ASQVRJ","canonical_record":{"source":{"id":"2107.02518","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-06T10:22:33Z","cross_cats_sorted":[],"title_canon_sha256":"49b684e9a4cb9f0818f8cd736844fb2d65bea8311d7bcb8769d5a20bb1d43cb0","abstract_canon_sha256":"3236c5d28b849da48988bd2c6deb9bee841226664097532d5f670d24afa42d33"},"schema_version":"1.0"},"canonical_sha256":"b6812856296c75bf5881fa4193b1b9091f04033353e6ae8e12dfd790a33f5f6d","source":{"kind":"arxiv","id":"2107.02518","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.02518","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"arxiv_version","alias_value":"2107.02518v1","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.02518","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"pith_short_12","alias_value":"W2ASQVRJNR23","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"pith_short_16","alias_value":"W2ASQVRJNR236WEB","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"pith_short_8","alias_value":"W2ASQVRJ","created_at":"2026-07-05T02:55:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:W2ASQVRJNR236WEB7JAZHMNZBE","target":"record","payload":{"canonical_record":{"source":{"id":"2107.02518","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-06T10:22:33Z","cross_cats_sorted":[],"title_canon_sha256":"49b684e9a4cb9f0818f8cd736844fb2d65bea8311d7bcb8769d5a20bb1d43cb0","abstract_canon_sha256":"3236c5d28b849da48988bd2c6deb9bee841226664097532d5f670d24afa42d33"},"schema_version":"1.0"},"canonical_sha256":"b6812856296c75bf5881fa4193b1b9091f04033353e6ae8e12dfd790a33f5f6d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:55:21.675222Z","signature_b64":"/0Cg1DHiW61kjJ4fD97K+lxD65khqZdt3+I25NRhobdiQXVKJpvCEfQs7iwbG25Fc8Bj/FnSxY53tH4dsi83DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b6812856296c75bf5881fa4193b1b9091f04033353e6ae8e12dfd790a33f5f6d","last_reissued_at":"2026-07-05T02:55:21.674740Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:55:21.674740Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.02518","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":"2026-07-05T02:55:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8FocfVBynotjS89995F0NnuypI/1XSxKy/xdC4CI0DNPfqqMfXEkavMpUXSQLOnVKdtOlTSn0TW499AOmrg5AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T18:06:08.316650Z"},"content_sha256":"c4b3407157a93b2cf9876c0d1153601954c5a640824db1633ea8311ade1bb62a","schema_version":"1.0","event_id":"sha256:c4b3407157a93b2cf9876c0d1153601954c5a640824db1633ea8311ade1bb62a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:W2ASQVRJNR236WEB7JAZHMNZBE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Theoretical predictions of surface light element abundances in protostellar and pre-Main Sequence phase","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Chiavassa, A. Tumino, C. Spitaleri, E. Tognelli, L. Lamia, P.G. Prada Moroni, R.G. Pizzone, S. Degl'Innocenti","submitted_at":"2021-07-06T10:22:33Z","abstract_excerpt":"Theoretical prediction of surface stellar abundances of light elements -- lithium, beryllium, and boron -- represents one of the most interesting open problems in astrophysics. As well known, several measurements of 7-Li abundances in stellar atmospheres point out a disagreement between predictions and observations in different stellar evolutionary phases, rising doubts about the capability of present stellar models to precisely reproduce stellar envelope characteristics. Light elements are burned at relatively low temperatures (from 2 to 5 MK) and thus in the evolutionary stages of a star the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.02518","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2107.02518/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":"2026-07-05T02:55:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EuCBrA+U29A2BF9ZO2vRNYukBuObiRsb+crDJ620c/rTFXMggdd/+kmqWHJeqj79jWhqOPeAjh9saEI3x/wWDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T18:06:08.316996Z"},"content_sha256":"b74d4729500dd425ff46a38582d697af289074f91bd9c23e71d4bec8d1c4fd3c","schema_version":"1.0","event_id":"sha256:b74d4729500dd425ff46a38582d697af289074f91bd9c23e71d4bec8d1c4fd3c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W2ASQVRJNR236WEB7JAZHMNZBE/bundle.json","state_url":"https://pith.science/pith/W2ASQVRJNR236WEB7JAZHMNZBE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W2ASQVRJNR236WEB7JAZHMNZBE/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":"2026-07-31T18:06:08Z","links":{"resolver":"https://pith.science/pith/W2ASQVRJNR236WEB7JAZHMNZBE","bundle":"https://pith.science/pith/W2ASQVRJNR236WEB7JAZHMNZBE/bundle.json","state":"https://pith.science/pith/W2ASQVRJNR236WEB7JAZHMNZBE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W2ASQVRJNR236WEB7JAZHMNZBE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:W2ASQVRJNR236WEB7JAZHMNZBE","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":"3236c5d28b849da48988bd2c6deb9bee841226664097532d5f670d24afa42d33","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-06T10:22:33Z","title_canon_sha256":"49b684e9a4cb9f0818f8cd736844fb2d65bea8311d7bcb8769d5a20bb1d43cb0"},"schema_version":"1.0","source":{"id":"2107.02518","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.02518","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"arxiv_version","alias_value":"2107.02518v1","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.02518","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"pith_short_12","alias_value":"W2ASQVRJNR23","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"pith_short_16","alias_value":"W2ASQVRJNR236WEB","created_at":"2026-07-05T02:55:21Z"},{"alias_kind":"pith_short_8","alias_value":"W2ASQVRJ","created_at":"2026-07-05T02:55:21Z"}],"graph_snapshots":[{"event_id":"sha256:b74d4729500dd425ff46a38582d697af289074f91bd9c23e71d4bec8d1c4fd3c","target":"graph","created_at":"2026-07-05T02:55:21Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2107.02518/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Theoretical prediction of surface stellar abundances of light elements -- lithium, beryllium, and boron -- represents one of the most interesting open problems in astrophysics. As well known, several measurements of 7-Li abundances in stellar atmospheres point out a disagreement between predictions and observations in different stellar evolutionary phases, rising doubts about the capability of present stellar models to precisely reproduce stellar envelope characteristics. Light elements are burned at relatively low temperatures (from 2 to 5 MK) and thus in the evolutionary stages of a star the","authors_text":"A. Chiavassa, A. Tumino, C. Spitaleri, E. Tognelli, L. Lamia, P.G. Prada Moroni, R.G. Pizzone, S. Degl'Innocenti","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-06T10:22:33Z","title":"Theoretical predictions of surface light element abundances in protostellar and pre-Main Sequence phase"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.02518","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:c4b3407157a93b2cf9876c0d1153601954c5a640824db1633ea8311ade1bb62a","target":"record","created_at":"2026-07-05T02:55:21Z","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":"3236c5d28b849da48988bd2c6deb9bee841226664097532d5f670d24afa42d33","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-06T10:22:33Z","title_canon_sha256":"49b684e9a4cb9f0818f8cd736844fb2d65bea8311d7bcb8769d5a20bb1d43cb0"},"schema_version":"1.0","source":{"id":"2107.02518","kind":"arxiv","version":1}},"canonical_sha256":"b6812856296c75bf5881fa4193b1b9091f04033353e6ae8e12dfd790a33f5f6d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6812856296c75bf5881fa4193b1b9091f04033353e6ae8e12dfd790a33f5f6d","first_computed_at":"2026-07-05T02:55:21.674740Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:55:21.674740Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/0Cg1DHiW61kjJ4fD97K+lxD65khqZdt3+I25NRhobdiQXVKJpvCEfQs7iwbG25Fc8Bj/FnSxY53tH4dsi83DQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:55:21.675222Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.02518","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c4b3407157a93b2cf9876c0d1153601954c5a640824db1633ea8311ade1bb62a","sha256:b74d4729500dd425ff46a38582d697af289074f91bd9c23e71d4bec8d1c4fd3c"],"state_sha256":"6e35b319a2472a7fde6ef311a0f8f24e115c57a7fb2fd394d41338f7c1c3cfab"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+VOmLAzUI3Dagp9j7ogDuCPZhu21hcp1crQNbP30M+1DI97cCF9j8YVCpQwgh43xHJXq7q+BUZM5gxo4VO/gBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T18:06:08.319878Z","bundle_sha256":"885cc1998675c22314a3f2e116cbba73541cc9815e8c058120fe45a0db867c4a"}}