{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:5RVXP54EGYUCNLDELM7QNUFYC4","short_pith_number":"pith:5RVXP54E","canonical_record":{"source":{"id":"2106.00981","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-06-02T06:55:28Z","cross_cats_sorted":[],"title_canon_sha256":"24d2934697ccda5d23b5e1ba94f02b7b5d9d7001fb9bdb590521c3c65c2b90cc","abstract_canon_sha256":"f82bbc4cb4b7c167f7652fa31394772517bc87189c0df2a38939bc7d7cec03ca"},"schema_version":"1.0"},"canonical_sha256":"ec6b77f784362826ac645b3f06d0b8173523ff1fb97a6e2aa668b855239e5129","source":{"kind":"arxiv","id":"2106.00981","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2106.00981","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"arxiv_version","alias_value":"2106.00981v1","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.00981","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"pith_short_12","alias_value":"5RVXP54EGYUC","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"pith_short_16","alias_value":"5RVXP54EGYUCNLDE","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"pith_short_8","alias_value":"5RVXP54E","created_at":"2026-07-05T02:45:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:5RVXP54EGYUCNLDELM7QNUFYC4","target":"record","payload":{"canonical_record":{"source":{"id":"2106.00981","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-06-02T06:55:28Z","cross_cats_sorted":[],"title_canon_sha256":"24d2934697ccda5d23b5e1ba94f02b7b5d9d7001fb9bdb590521c3c65c2b90cc","abstract_canon_sha256":"f82bbc4cb4b7c167f7652fa31394772517bc87189c0df2a38939bc7d7cec03ca"},"schema_version":"1.0"},"canonical_sha256":"ec6b77f784362826ac645b3f06d0b8173523ff1fb97a6e2aa668b855239e5129","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:45:42.368942Z","signature_b64":"Momsmsh0NseDqMD67TSqVAI/w9Eih4sBC+uu47F/r9e880qgvYHeoBVna+AV6vKrUqYs1GRT6GEm2l71jYU9BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ec6b77f784362826ac645b3f06d0b8173523ff1fb97a6e2aa668b855239e5129","last_reissued_at":"2026-07-05T02:45:42.368459Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:45:42.368459Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2106.00981","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":"2026-07-05T02:45:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"29jFRQ5pnrbZd+tIbzpklKWjTL6R2T7VdcR0Vydo66dT1JtSYyPPurOMunXXi8ufanMe2ovo6ySDndmLGipQBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T02:51:17.498327Z"},"content_sha256":"820f2490babf49621d578ecd2135f02d11b53895f8d9f22a8b81b6e3453739f8","schema_version":"1.0","event_id":"sha256:820f2490babf49621d578ecd2135f02d11b53895f8d9f22a8b81b6e3453739f8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:5RVXP54EGYUCNLDELM7QNUFYC4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"OxyJet: Design and Evaluation of A Low-Cost Precision Venturi Based Continuous Positive Airway Pressure (CPAP) System","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Farhan Muhib, Kaisar Ahmed Alman, Md. Kawsar Ahmed, Meemnur Rashid, Saeedur Rahman, Taufiq Hasan","submitted_at":"2021-06-02T06:55:28Z","abstract_excerpt":"The Covid-19 pandemic has strained the hospital systems in many countries in the world, especially in developing countries. In many low-resource hospitals, severely ill hypoxemic Covid-19 patients are treated with various forms of low-flow oxygen therapy (0-15 L/min), including interfaces such as a nasal cannula, Hudson mask, venturi-mask, and non-rebreather masks. When 15L/min of pure oxygen flow is not sufficient for the patient, treatment guidelines suggest non-invasive positive pressure ventilation (NIPPV) or high-flow nasal oxygenation (HFNO) as the next stage of treatment. However, admin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.00981","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/2106.00981/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":"2026-07-05T02:45:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x5gaGVF50rID65y+Xh4Gs7iYxfir1kxmz0sjm8XnAkcY68nNVKaQ8Eqry679RdOrtOdX5lT6+QchDsIZguOrCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T02:51:17.498660Z"},"content_sha256":"543beec39752d3d5e4123471d1e040446b14ace9de21453a8b246208a4a4b3dd","schema_version":"1.0","event_id":"sha256:543beec39752d3d5e4123471d1e040446b14ace9de21453a8b246208a4a4b3dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5RVXP54EGYUCNLDELM7QNUFYC4/bundle.json","state_url":"https://pith.science/pith/5RVXP54EGYUCNLDELM7QNUFYC4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5RVXP54EGYUCNLDELM7QNUFYC4/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":"2026-08-21T02:51:17Z","links":{"resolver":"https://pith.science/pith/5RVXP54EGYUCNLDELM7QNUFYC4","bundle":"https://pith.science/pith/5RVXP54EGYUCNLDELM7QNUFYC4/bundle.json","state":"https://pith.science/pith/5RVXP54EGYUCNLDELM7QNUFYC4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5RVXP54EGYUCNLDELM7QNUFYC4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:5RVXP54EGYUCNLDELM7QNUFYC4","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":"f82bbc4cb4b7c167f7652fa31394772517bc87189c0df2a38939bc7d7cec03ca","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-06-02T06:55:28Z","title_canon_sha256":"24d2934697ccda5d23b5e1ba94f02b7b5d9d7001fb9bdb590521c3c65c2b90cc"},"schema_version":"1.0","source":{"id":"2106.00981","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2106.00981","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"arxiv_version","alias_value":"2106.00981v1","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.00981","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"pith_short_12","alias_value":"5RVXP54EGYUC","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"pith_short_16","alias_value":"5RVXP54EGYUCNLDE","created_at":"2026-07-05T02:45:42Z"},{"alias_kind":"pith_short_8","alias_value":"5RVXP54E","created_at":"2026-07-05T02:45:42Z"}],"graph_snapshots":[{"event_id":"sha256:543beec39752d3d5e4123471d1e040446b14ace9de21453a8b246208a4a4b3dd","target":"graph","created_at":"2026-07-05T02:45:42Z","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/2106.00981/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The Covid-19 pandemic has strained the hospital systems in many countries in the world, especially in developing countries. In many low-resource hospitals, severely ill hypoxemic Covid-19 patients are treated with various forms of low-flow oxygen therapy (0-15 L/min), including interfaces such as a nasal cannula, Hudson mask, venturi-mask, and non-rebreather masks. When 15L/min of pure oxygen flow is not sufficient for the patient, treatment guidelines suggest non-invasive positive pressure ventilation (NIPPV) or high-flow nasal oxygenation (HFNO) as the next stage of treatment. However, admin","authors_text":"Farhan Muhib, Kaisar Ahmed Alman, Md. Kawsar Ahmed, Meemnur Rashid, Saeedur Rahman, Taufiq Hasan","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-06-02T06:55:28Z","title":"OxyJet: Design and Evaluation of A Low-Cost Precision Venturi Based Continuous Positive Airway Pressure (CPAP) System"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.00981","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":"sha256:820f2490babf49621d578ecd2135f02d11b53895f8d9f22a8b81b6e3453739f8","target":"record","created_at":"2026-07-05T02:45:42Z","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":"f82bbc4cb4b7c167f7652fa31394772517bc87189c0df2a38939bc7d7cec03ca","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-06-02T06:55:28Z","title_canon_sha256":"24d2934697ccda5d23b5e1ba94f02b7b5d9d7001fb9bdb590521c3c65c2b90cc"},"schema_version":"1.0","source":{"id":"2106.00981","kind":"arxiv","version":1}},"canonical_sha256":"ec6b77f784362826ac645b3f06d0b8173523ff1fb97a6e2aa668b855239e5129","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ec6b77f784362826ac645b3f06d0b8173523ff1fb97a6e2aa668b855239e5129","first_computed_at":"2026-07-05T02:45:42.368459Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:45:42.368459Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Momsmsh0NseDqMD67TSqVAI/w9Eih4sBC+uu47F/r9e880qgvYHeoBVna+AV6vKrUqYs1GRT6GEm2l71jYU9BQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:45:42.368942Z","signed_message":"canonical_sha256_bytes"},"source_id":"2106.00981","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:820f2490babf49621d578ecd2135f02d11b53895f8d9f22a8b81b6e3453739f8","sha256:543beec39752d3d5e4123471d1e040446b14ace9de21453a8b246208a4a4b3dd"],"state_sha256":"0fdfe51eeb8fdb515c076827a74f8cea2a7ad60da12ed177837ceaed9697d0ca"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+1JdEgf18Yw72GpNs/ns7Gt+ysWt49w3HNPhSgiD6+bb6sNvc++9bIKQUUgcgUKtWyeMd9CklOBuj4r+NlSBCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T02:51:17.502050Z","bundle_sha256":"6738b0b899f3f69c6fedff5162ede4dbe6b839ab85717464fb6d96a773b06bf3"}}