{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:GDSIHVE4NJZUTOMLXPUCLHB6TP","short_pith_number":"pith:GDSIHVE4","canonical_record":{"source":{"id":"2512.13720","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2025-12-11T22:26:41Z","cross_cats_sorted":["q-bio.QM"],"title_canon_sha256":"c2e794db34802f68a3a21fe9e0b14862f04841231ff7453be039225ccc5a7c4b","abstract_canon_sha256":"64c0660f5a6ad6d50209e5a6785c9e7c96857925c8c8b4abd7923a7bf11aff95"},"schema_version":"1.0"},"canonical_sha256":"30e483d49c6a7349b98bbbe8259c3e9bc955a751665183ac482b7c2a6d673333","source":{"kind":"arxiv","id":"2512.13720","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.13720","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"arxiv_version","alias_value":"2512.13720v2","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.13720","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"pith_short_12","alias_value":"GDSIHVE4NJZU","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"pith_short_16","alias_value":"GDSIHVE4NJZUTOML","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"pith_short_8","alias_value":"GDSIHVE4","created_at":"2026-07-31T00:10:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:GDSIHVE4NJZUTOMLXPUCLHB6TP","target":"record","payload":{"canonical_record":{"source":{"id":"2512.13720","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2025-12-11T22:26:41Z","cross_cats_sorted":["q-bio.QM"],"title_canon_sha256":"c2e794db34802f68a3a21fe9e0b14862f04841231ff7453be039225ccc5a7c4b","abstract_canon_sha256":"64c0660f5a6ad6d50209e5a6785c9e7c96857925c8c8b4abd7923a7bf11aff95"},"schema_version":"1.0"},"canonical_sha256":"30e483d49c6a7349b98bbbe8259c3e9bc955a751665183ac482b7c2a6d673333","receipt":{"kind":"pith_receipt","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"30e483d49c6a7349b98bbbe8259c3e9bc955a751665183ac482b7c2a6d673333","last_reissued_at":"2026-07-31T00:10:11.360030Z","signature_status":"unsigned_v0","first_computed_at":"2026-07-31T00:10:11.360030Z"},"source_kind":"arxiv","source_id":"2512.13720","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-31T00:10:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xPgYO3V0xms85uEqdgP05CW4k1CeKwmOMJ4JRRMDMoFk6QrfV3tTtiWQiVXU9fAVD0N9wGD5Y24k8+PyEIfZBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T10:21:29.500098Z"},"content_sha256":"d4123b91fc15a3cae09f47e18c004df08a415de716ff003fa4ef1078751e19e0","schema_version":"1.0","event_id":"sha256:d4123b91fc15a3cae09f47e18c004df08a415de716ff003fa4ef1078751e19e0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:GDSIHVE4NJZUTOMLXPUCLHB6TP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Absement: Quantitative Assessment of Metabolic Cost during Quasi-Isometric Muscle Loading","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["q-bio.QM"],"primary_cat":"physics.bio-ph","authors_text":"Serhii V Marchenko","submitted_at":"2025-12-11T22:26:41Z","abstract_excerpt":"Small deviations during nominally isometric loading can be separated into a sustained mean offset and fluctuations about that offset. We develop a local quasi-static model that connects these video-accessible kinematic quantities to metabolic energy. Muscle activation is eliminated through joint-moment equilibrium, and the resulting metabolic power is reduced to a smooth function of a locally invertible muscle-length coordinate. For the deviation \\(x(t)=\\ell(t)-\\ell_0\\), the reduced energy satisfies \\[ \\mathcal{E}_{\\mathrm{met}}[\\ell] =\nP_0T +\nC_1\\Delta\\mathcal{A}_{\\ell} +\nC_2\\mathcal{M}_{2,\\e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.13720","kind":"arxiv","version":2},"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/2512.13720/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":"2026-07-31T00:10:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F5tHCUg4nN+ChTGwsvSat43ybExMyRfDmFqxtY4FnR9P0Z+nrhX3aCsonVM+oRRowzX570r72OKHgAejl5nLCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T10:21:29.500696Z"},"content_sha256":"56beb7d850fc024ddedcb666b9a028a323ec3025792e32938f48379ab006f912","schema_version":"1.0","event_id":"sha256:56beb7d850fc024ddedcb666b9a028a323ec3025792e32938f48379ab006f912"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GDSIHVE4NJZUTOMLXPUCLHB6TP/bundle.json","state_url":"https://pith.science/pith/GDSIHVE4NJZUTOMLXPUCLHB6TP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GDSIHVE4NJZUTOMLXPUCLHB6TP/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":"2026-08-21T10:21:29Z","links":{"resolver":"https://pith.science/pith/GDSIHVE4NJZUTOMLXPUCLHB6TP","bundle":"https://pith.science/pith/GDSIHVE4NJZUTOMLXPUCLHB6TP/bundle.json","state":"https://pith.science/pith/GDSIHVE4NJZUTOMLXPUCLHB6TP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GDSIHVE4NJZUTOMLXPUCLHB6TP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:GDSIHVE4NJZUTOMLXPUCLHB6TP","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":"64c0660f5a6ad6d50209e5a6785c9e7c96857925c8c8b4abd7923a7bf11aff95","cross_cats_sorted":["q-bio.QM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2025-12-11T22:26:41Z","title_canon_sha256":"c2e794db34802f68a3a21fe9e0b14862f04841231ff7453be039225ccc5a7c4b"},"schema_version":"1.0","source":{"id":"2512.13720","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.13720","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"arxiv_version","alias_value":"2512.13720v2","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.13720","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"pith_short_12","alias_value":"GDSIHVE4NJZU","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"pith_short_16","alias_value":"GDSIHVE4NJZUTOML","created_at":"2026-07-31T00:10:11Z"},{"alias_kind":"pith_short_8","alias_value":"GDSIHVE4","created_at":"2026-07-31T00:10:11Z"}],"graph_snapshots":[{"event_id":"sha256:56beb7d850fc024ddedcb666b9a028a323ec3025792e32938f48379ab006f912","target":"graph","created_at":"2026-07-31T00:10:11Z","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/2512.13720/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Small deviations during nominally isometric loading can be separated into a sustained mean offset and fluctuations about that offset. We develop a local quasi-static model that connects these video-accessible kinematic quantities to metabolic energy. Muscle activation is eliminated through joint-moment equilibrium, and the resulting metabolic power is reduced to a smooth function of a locally invertible muscle-length coordinate. For the deviation \\(x(t)=\\ell(t)-\\ell_0\\), the reduced energy satisfies \\[ \\mathcal{E}_{\\mathrm{met}}[\\ell] =\nP_0T +\nC_1\\Delta\\mathcal{A}_{\\ell} +\nC_2\\mathcal{M}_{2,\\e","authors_text":"Serhii V Marchenko","cross_cats":["q-bio.QM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2025-12-11T22:26:41Z","title":"Absement: Quantitative Assessment of Metabolic Cost during Quasi-Isometric Muscle Loading"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.13720","kind":"arxiv","version":2},"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:d4123b91fc15a3cae09f47e18c004df08a415de716ff003fa4ef1078751e19e0","target":"record","created_at":"2026-07-31T00:10:11Z","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":"64c0660f5a6ad6d50209e5a6785c9e7c96857925c8c8b4abd7923a7bf11aff95","cross_cats_sorted":["q-bio.QM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2025-12-11T22:26:41Z","title_canon_sha256":"c2e794db34802f68a3a21fe9e0b14862f04841231ff7453be039225ccc5a7c4b"},"schema_version":"1.0","source":{"id":"2512.13720","kind":"arxiv","version":2}},"canonical_sha256":"30e483d49c6a7349b98bbbe8259c3e9bc955a751665183ac482b7c2a6d673333","receipt":{"builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"30e483d49c6a7349b98bbbe8259c3e9bc955a751665183ac482b7c2a6d673333","first_computed_at":"2026-07-31T00:10:11.360030Z","kind":"pith_receipt","last_reissued_at":"2026-07-31T00:10:11.360030Z","receipt_version":"0.3","signature_status":"unsigned_v0"},"source_id":"2512.13720","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d4123b91fc15a3cae09f47e18c004df08a415de716ff003fa4ef1078751e19e0","sha256:56beb7d850fc024ddedcb666b9a028a323ec3025792e32938f48379ab006f912"],"state_sha256":"88a5cc132cee492b161746c328946f3e53c7c3432fa91c76956918a4a9abf887"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TEIFpyrL8jXpo3er0H4yO4tcdtxSSkAq8lLoYUwQ/gaiyBADDDCXEmL7t5NV+eAhep4/g1gKnvv3F8CYxrrxBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T10:21:29.505893Z","bundle_sha256":"8d6834791f35fcda68ab1bc0bafe72f0679f90adf222ed129989a8680a907355"}}