{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:7FBDTV4LCL3VIXNRAK7GHTSQCD","short_pith_number":"pith:7FBDTV4L","canonical_record":{"source":{"id":"2605.19252","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"q-bio.BM","submitted_at":"2026-05-19T01:49:35Z","cross_cats_sorted":["astro-ph.EP","q-bio.MN"],"title_canon_sha256":"2072965befc97bfb45c36f125e6c10a5681ba2b2ea4b54837f604ac52acfc4c5","abstract_canon_sha256":"0b7c726a148c02bc9b8012a8e9630c2cf5e0a54acf4ffe3f123f9e07816727dc"},"schema_version":"1.0"},"canonical_sha256":"f94239d78b12f7545db102be63ce5010caeb29044d1cf271c78273cfd6c7e384","source":{"kind":"arxiv","id":"2605.19252","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.19252","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"arxiv_version","alias_value":"2605.19252v1","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.19252","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"pith_short_12","alias_value":"7FBDTV4LCL3V","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"pith_short_16","alias_value":"7FBDTV4LCL3VIXNR","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"pith_short_8","alias_value":"7FBDTV4L","created_at":"2026-05-20T01:05:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:7FBDTV4LCL3VIXNRAK7GHTSQCD","target":"record","payload":{"canonical_record":{"source":{"id":"2605.19252","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"q-bio.BM","submitted_at":"2026-05-19T01:49:35Z","cross_cats_sorted":["astro-ph.EP","q-bio.MN"],"title_canon_sha256":"2072965befc97bfb45c36f125e6c10a5681ba2b2ea4b54837f604ac52acfc4c5","abstract_canon_sha256":"0b7c726a148c02bc9b8012a8e9630c2cf5e0a54acf4ffe3f123f9e07816727dc"},"schema_version":"1.0"},"canonical_sha256":"f94239d78b12f7545db102be63ce5010caeb29044d1cf271c78273cfd6c7e384","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-20T01:05:36.110535Z","signature_b64":"pLcq8i8OXwOdnPoKxeP8FTeTpfITaJoLXnckZ3SpghGB5bLxS8PZfLOFXY8btCIqmXIJJkYkOXT4xCNT/czkDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f94239d78b12f7545db102be63ce5010caeb29044d1cf271c78273cfd6c7e384","last_reissued_at":"2026-05-20T01:05:36.109797Z","signature_status":"signed_v1","first_computed_at":"2026-05-20T01:05:36.109797Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.19252","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":"2026-05-20T01:05:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/mBQFFpyDnoHbwqfCjMuozHXDLQKp+LY+mv5HpiqV6o700hGQA9n1m59Ajjr3s+F4kMbpUDe3dLiosDjcvZmCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T09:53:39.022541Z"},"content_sha256":"54a19f1ec69982471d6c9fc6930be433d8ba4966866e8f706e922feb76a038d5","schema_version":"1.0","event_id":"sha256:54a19f1ec69982471d6c9fc6930be433d8ba4966866e8f706e922feb76a038d5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:7FBDTV4LCL3VIXNRAK7GHTSQCD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Elemental Stoichiometry as an Ecological Biosignature with Applications to Life Detection","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.EP","q-bio.MN"],"primary_cat":"q-bio.BM","authors_text":"Christopher P. Kempes, Cole Mathis, Elizabeth Trembath-Reichert, Hilairy E. Hartnett, John F. Malloy, L. Felipe Benites, Pilar C. Vergeli, Sara I. Walker","submitted_at":"2026-05-19T01:49:35Z","abstract_excerpt":"The vast chemical space of possible small molecules, estimated at 10^60 compounds for molecules composed of just C, N, O, and S, is only sparsely occupied by biology. We propose that where life selects molecules within this space constitutes a detectable ecological signature: a fingerprint not of specific compounds, but of the statistical structure of elemental composition across molecules sam-pled from ecological systems. Here we introduce a framework combining Van Krevelen diagrams and element scaling laws to characterize the elemental composition of regions of chemical space occupied by bio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.19252","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/2605.19252/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":"2026-05-20T01:05:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RrBdAGIzGj1YtC+6SyQ0Z9ytyJyK96HZ3Gl6R2wgiyhvlwZiIj3YknXpQnRk4bF6yXsZTtblr+Ypsjt2Qs8BDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T09:53:39.023007Z"},"content_sha256":"3926ea8393e3b693c11ab9d4fd0d57ea0f7fb7f73511e206d35ec07fabdf8c8b","schema_version":"1.0","event_id":"sha256:3926ea8393e3b693c11ab9d4fd0d57ea0f7fb7f73511e206d35ec07fabdf8c8b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7FBDTV4LCL3VIXNRAK7GHTSQCD/bundle.json","state_url":"https://pith.science/pith/7FBDTV4LCL3VIXNRAK7GHTSQCD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7FBDTV4LCL3VIXNRAK7GHTSQCD/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":"2026-05-24T09:53:39Z","links":{"resolver":"https://pith.science/pith/7FBDTV4LCL3VIXNRAK7GHTSQCD","bundle":"https://pith.science/pith/7FBDTV4LCL3VIXNRAK7GHTSQCD/bundle.json","state":"https://pith.science/pith/7FBDTV4LCL3VIXNRAK7GHTSQCD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7FBDTV4LCL3VIXNRAK7GHTSQCD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:7FBDTV4LCL3VIXNRAK7GHTSQCD","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":"0b7c726a148c02bc9b8012a8e9630c2cf5e0a54acf4ffe3f123f9e07816727dc","cross_cats_sorted":["astro-ph.EP","q-bio.MN"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"q-bio.BM","submitted_at":"2026-05-19T01:49:35Z","title_canon_sha256":"2072965befc97bfb45c36f125e6c10a5681ba2b2ea4b54837f604ac52acfc4c5"},"schema_version":"1.0","source":{"id":"2605.19252","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.19252","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"arxiv_version","alias_value":"2605.19252v1","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.19252","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"pith_short_12","alias_value":"7FBDTV4LCL3V","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"pith_short_16","alias_value":"7FBDTV4LCL3VIXNR","created_at":"2026-05-20T01:05:36Z"},{"alias_kind":"pith_short_8","alias_value":"7FBDTV4L","created_at":"2026-05-20T01:05:36Z"}],"graph_snapshots":[{"event_id":"sha256:3926ea8393e3b693c11ab9d4fd0d57ea0f7fb7f73511e206d35ec07fabdf8c8b","target":"graph","created_at":"2026-05-20T01:05:36Z","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/2605.19252/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The vast chemical space of possible small molecules, estimated at 10^60 compounds for molecules composed of just C, N, O, and S, is only sparsely occupied by biology. We propose that where life selects molecules within this space constitutes a detectable ecological signature: a fingerprint not of specific compounds, but of the statistical structure of elemental composition across molecules sam-pled from ecological systems. Here we introduce a framework combining Van Krevelen diagrams and element scaling laws to characterize the elemental composition of regions of chemical space occupied by bio","authors_text":"Christopher P. Kempes, Cole Mathis, Elizabeth Trembath-Reichert, Hilairy E. Hartnett, John F. Malloy, L. Felipe Benites, Pilar C. Vergeli, Sara I. Walker","cross_cats":["astro-ph.EP","q-bio.MN"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"q-bio.BM","submitted_at":"2026-05-19T01:49:35Z","title":"Elemental Stoichiometry as an Ecological Biosignature with Applications to Life Detection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.19252","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":"sha256:54a19f1ec69982471d6c9fc6930be433d8ba4966866e8f706e922feb76a038d5","target":"record","created_at":"2026-05-20T01:05:36Z","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":"0b7c726a148c02bc9b8012a8e9630c2cf5e0a54acf4ffe3f123f9e07816727dc","cross_cats_sorted":["astro-ph.EP","q-bio.MN"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"q-bio.BM","submitted_at":"2026-05-19T01:49:35Z","title_canon_sha256":"2072965befc97bfb45c36f125e6c10a5681ba2b2ea4b54837f604ac52acfc4c5"},"schema_version":"1.0","source":{"id":"2605.19252","kind":"arxiv","version":1}},"canonical_sha256":"f94239d78b12f7545db102be63ce5010caeb29044d1cf271c78273cfd6c7e384","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f94239d78b12f7545db102be63ce5010caeb29044d1cf271c78273cfd6c7e384","first_computed_at":"2026-05-20T01:05:36.109797Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-20T01:05:36.109797Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pLcq8i8OXwOdnPoKxeP8FTeTpfITaJoLXnckZ3SpghGB5bLxS8PZfLOFXY8btCIqmXIJJkYkOXT4xCNT/czkDA==","signature_status":"signed_v1","signed_at":"2026-05-20T01:05:36.110535Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.19252","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:54a19f1ec69982471d6c9fc6930be433d8ba4966866e8f706e922feb76a038d5","sha256:3926ea8393e3b693c11ab9d4fd0d57ea0f7fb7f73511e206d35ec07fabdf8c8b"],"state_sha256":"c32af8a943bf0c849159da2206e0ff96b2a65110dab76cfc700b3c0b2709d6e5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ixF2SXFgsmqoZ/Go5g6b0cLmhs6IhRZM1yDrHzcbS3Dmp6jFahCXOsQ+3IUUQBFOX/di1yU0+4XsIM/ZOMXLCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T09:53:39.027247Z","bundle_sha256":"93e15240b283a2fa1ae32ff4c9cfb71968db65444d54a766b00026e708f1f58e"}}