{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:XCTBVZSDZNJM7LOFOABOOCY42C","short_pith_number":"pith:XCTBVZSD","canonical_record":{"source":{"id":"1909.11177","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-08-22T03:18:42Z","cross_cats_sorted":["eess.SP"],"title_canon_sha256":"2e47cb98cd52461fe0936bf9fb50fc1111c10a6bbe6e90a69af3c623d3fc4dbe","abstract_canon_sha256":"20df8b0b63135f8e0321caee3f17ddb9894408f1b8cc3d29071edac50bf33f3b"},"schema_version":"1.0"},"canonical_sha256":"b8a61ae643cb52cfadc57002e70b1cd0bb09fe3673e5e7c5b93c6d211116d116","source":{"kind":"arxiv","id":"1909.11177","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.11177","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"arxiv_version","alias_value":"1909.11177v1","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.11177","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"pith_short_12","alias_value":"XCTBVZSDZNJM","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"pith_short_16","alias_value":"XCTBVZSDZNJM7LOF","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"pith_short_8","alias_value":"XCTBVZSD","created_at":"2026-07-05T00:07:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:XCTBVZSDZNJM7LOFOABOOCY42C","target":"record","payload":{"canonical_record":{"source":{"id":"1909.11177","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-08-22T03:18:42Z","cross_cats_sorted":["eess.SP"],"title_canon_sha256":"2e47cb98cd52461fe0936bf9fb50fc1111c10a6bbe6e90a69af3c623d3fc4dbe","abstract_canon_sha256":"20df8b0b63135f8e0321caee3f17ddb9894408f1b8cc3d29071edac50bf33f3b"},"schema_version":"1.0"},"canonical_sha256":"b8a61ae643cb52cfadc57002e70b1cd0bb09fe3673e5e7c5b93c6d211116d116","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:07:09.116185Z","signature_b64":"fl24CMNUsKM54n/kmwootAUjxjzHkJ/iPfETXjQi7luAkwIwfxKXZTh0zxMOVIkrrIejTWPL+vSLiMu31wTOAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b8a61ae643cb52cfadc57002e70b1cd0bb09fe3673e5e7c5b93c6d211116d116","last_reissued_at":"2026-07-05T00:07:09.115795Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:07:09.115795Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.11177","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":"2026-07-05T00:07:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MiM5H91K5l8SnElIZ8RG/wufSlBoaoKxPIPn2IEkLBcx05K3V0Kk7BZGsEqwgI9rMPJs/rQRi/YjXGW27KByAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T14:38:18.503827Z"},"content_sha256":"3cff82d9e4a7413687d4214bbd7dae521527602a96ef23b89dbd27fdfe0506d7","schema_version":"1.0","event_id":"sha256:3cff82d9e4a7413687d4214bbd7dae521527602a96ef23b89dbd27fdfe0506d7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:XCTBVZSDZNJM7LOFOABOOCY42C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Using infrared gas sensors in an in-vitro dynamic gut model for detecting short-chain fatty-acids: Technical Report","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP"],"primary_cat":"physics.ins-det","authors_text":"Amy Loutfi, Igancio Rangel, Johnny Karlsson, Martin L\\\"angkvist, Robert Jan Brummer","submitted_at":"2019-08-22T03:18:42Z","abstract_excerpt":"Short-chain fatty acids (SCFAs), including acetate, propionate and butyrate, are organic fatty-acids that are produced when indigested carbohydrates are fermented in the colon by gut-bacteria. Butyrate is especially considered a beneficial compound in relation to gut health and the maintenance of colonic homeostasis. Little is known about butyrate production and the current measurement methods of fecal samples are not representative and there is a strong unmet need to measure SCFAs in-vivo to further understand their role and effect on colonic function in human gut health and disease. The gene"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.11177","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/1909.11177/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":"2026-07-05T00:07:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aMrjp6tf0O2epDc73LCEQKj0M9JSfcCE1xfpNbdjqLWyo8cBeoq30Ve01b79BmfX8wc2JJMzE+zOfwQYkYT8Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T14:38:18.504773Z"},"content_sha256":"ec7275b7fc228d0b77fbcb56452d2a42a8351e6edce79fad431444d9e0a7944c","schema_version":"1.0","event_id":"sha256:ec7275b7fc228d0b77fbcb56452d2a42a8351e6edce79fad431444d9e0a7944c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XCTBVZSDZNJM7LOFOABOOCY42C/bundle.json","state_url":"https://pith.science/pith/XCTBVZSDZNJM7LOFOABOOCY42C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XCTBVZSDZNJM7LOFOABOOCY42C/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":"2026-08-16T14:38:18Z","links":{"resolver":"https://pith.science/pith/XCTBVZSDZNJM7LOFOABOOCY42C","bundle":"https://pith.science/pith/XCTBVZSDZNJM7LOFOABOOCY42C/bundle.json","state":"https://pith.science/pith/XCTBVZSDZNJM7LOFOABOOCY42C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XCTBVZSDZNJM7LOFOABOOCY42C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XCTBVZSDZNJM7LOFOABOOCY42C","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":"20df8b0b63135f8e0321caee3f17ddb9894408f1b8cc3d29071edac50bf33f3b","cross_cats_sorted":["eess.SP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-08-22T03:18:42Z","title_canon_sha256":"2e47cb98cd52461fe0936bf9fb50fc1111c10a6bbe6e90a69af3c623d3fc4dbe"},"schema_version":"1.0","source":{"id":"1909.11177","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.11177","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"arxiv_version","alias_value":"1909.11177v1","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.11177","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"pith_short_12","alias_value":"XCTBVZSDZNJM","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"pith_short_16","alias_value":"XCTBVZSDZNJM7LOF","created_at":"2026-07-05T00:07:09Z"},{"alias_kind":"pith_short_8","alias_value":"XCTBVZSD","created_at":"2026-07-05T00:07:09Z"}],"graph_snapshots":[{"event_id":"sha256:ec7275b7fc228d0b77fbcb56452d2a42a8351e6edce79fad431444d9e0a7944c","target":"graph","created_at":"2026-07-05T00:07:09Z","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/1909.11177/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Short-chain fatty acids (SCFAs), including acetate, propionate and butyrate, are organic fatty-acids that are produced when indigested carbohydrates are fermented in the colon by gut-bacteria. Butyrate is especially considered a beneficial compound in relation to gut health and the maintenance of colonic homeostasis. Little is known about butyrate production and the current measurement methods of fecal samples are not representative and there is a strong unmet need to measure SCFAs in-vivo to further understand their role and effect on colonic function in human gut health and disease. The gene","authors_text":"Amy Loutfi, Igancio Rangel, Johnny Karlsson, Martin L\\\"angkvist, Robert Jan Brummer","cross_cats":["eess.SP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-08-22T03:18:42Z","title":"Using infrared gas sensors in an in-vitro dynamic gut model for detecting short-chain fatty-acids: Technical Report"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.11177","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":"sha256:3cff82d9e4a7413687d4214bbd7dae521527602a96ef23b89dbd27fdfe0506d7","target":"record","created_at":"2026-07-05T00:07:09Z","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":"20df8b0b63135f8e0321caee3f17ddb9894408f1b8cc3d29071edac50bf33f3b","cross_cats_sorted":["eess.SP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-08-22T03:18:42Z","title_canon_sha256":"2e47cb98cd52461fe0936bf9fb50fc1111c10a6bbe6e90a69af3c623d3fc4dbe"},"schema_version":"1.0","source":{"id":"1909.11177","kind":"arxiv","version":1}},"canonical_sha256":"b8a61ae643cb52cfadc57002e70b1cd0bb09fe3673e5e7c5b93c6d211116d116","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b8a61ae643cb52cfadc57002e70b1cd0bb09fe3673e5e7c5b93c6d211116d116","first_computed_at":"2026-07-05T00:07:09.115795Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:07:09.115795Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fl24CMNUsKM54n/kmwootAUjxjzHkJ/iPfETXjQi7luAkwIwfxKXZTh0zxMOVIkrrIejTWPL+vSLiMu31wTOAA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:07:09.116185Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.11177","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3cff82d9e4a7413687d4214bbd7dae521527602a96ef23b89dbd27fdfe0506d7","sha256:ec7275b7fc228d0b77fbcb56452d2a42a8351e6edce79fad431444d9e0a7944c"],"state_sha256":"6d77aea16a5d208ee3b10240c01d0d47328d7844b8e8b24fbd9a49352c12ce8f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7opi1NuHg90ncpsWrCumtGtYRkDVUxfDBu9WhNP7awsOBcNpo6U54MgLZjI7M5V5Pu6XKHuCp4BqtZd/BslRCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T14:38:18.514372Z","bundle_sha256":"b22e758cccc7021d4735493899feb21df39b8cf591cf85d4e72d194148189391"}}