{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:2KC4QPABX63UPSBURNZOLMT4IR","short_pith_number":"pith:2KC4QPAB","canonical_record":{"source":{"id":"physics/9812017","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"physics.plasm-ph","submitted_at":"1998-12-10T20:27:23Z","cross_cats_sorted":["astro-ph","chao-dyn","nlin.CD"],"title_canon_sha256":"2eeb05be34213621c7b175d674d1e465130fac8fe2ec3d6985bf1dd389f983d9","abstract_canon_sha256":"f29d0d68782e4307d92de152f33317f3e420dd5d0b5404b634f26cdb9c8a4d76"},"schema_version":"1.0"},"canonical_sha256":"d285c83c01bfb747c8348b72e5b27c447d9446f710f4a946f75e9f604ea29851","source":{"kind":"arxiv","id":"physics/9812017","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"physics/9812017","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"arxiv_version","alias_value":"physics/9812017v2","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/9812017","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"pith_short_12","alias_value":"2KC4QPABX63U","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"pith_short_16","alias_value":"2KC4QPABX63UPSBU","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"pith_short_8","alias_value":"2KC4QPAB","created_at":"2026-07-04T16:10:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:2KC4QPABX63UPSBURNZOLMT4IR","target":"record","payload":{"canonical_record":{"source":{"id":"physics/9812017","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"physics.plasm-ph","submitted_at":"1998-12-10T20:27:23Z","cross_cats_sorted":["astro-ph","chao-dyn","nlin.CD"],"title_canon_sha256":"2eeb05be34213621c7b175d674d1e465130fac8fe2ec3d6985bf1dd389f983d9","abstract_canon_sha256":"f29d0d68782e4307d92de152f33317f3e420dd5d0b5404b634f26cdb9c8a4d76"},"schema_version":"1.0"},"canonical_sha256":"d285c83c01bfb747c8348b72e5b27c447d9446f710f4a946f75e9f604ea29851","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:10:26.807183Z","signature_b64":"TpuZX5y6OknNnGxQzzu0uqwF2pMpFxsrD0Ob7eSRy7l4ukcZIbPu5EL9bEkNtg60T5NCgNLFu1BoP1CpLZ3VDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d285c83c01bfb747c8348b72e5b27c447d9446f710f4a946f75e9f604ea29851","last_reissued_at":"2026-07-04T16:10:26.806782Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:10:26.806782Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"physics/9812017","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":"2026-07-04T16:10:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+ALnVnT7ow8RyFzx2VWNZbnr+01MMS9/gY5O13KDn8Y4m86EREZPx46l/tshzIVWC8ma1ZqCCGjPKLI6+WvqDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T20:12:31.516876Z"},"content_sha256":"288c4545a47d2021d26aa64caf833adf478d8f48521e10902bc0d88bffecdd1a","schema_version":"1.0","event_id":"sha256:288c4545a47d2021d26aa64caf833adf478d8f48521e10902bc0d88bffecdd1a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:2KC4QPABX63UPSBURNZOLMT4IR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Evidence for a singularity in ideal magnetohydrodynamics: implications for fast reconnection","license":"","headline":"","cross_cats":["astro-ph","chao-dyn","nlin.CD"],"primary_cat":"physics.plasm-ph","authors_text":"Axel Brandenburg, Robert M. Kerr","submitted_at":"1998-12-10T20:27:23Z","abstract_excerpt":"Numerical evidence for a finite-time singularity in ideal 3D magnetohydrodynamics (MHD) is presented. The simulations start from two interlocking magnetic flux rings with no initial velocity. The magnetic curvature force causes the flux rings to shrink until they come into contact. This produces a current sheet between them. In the ideal compressible calculations, the evidence for a singularity in a finite time $t_c$ is that the peak current density behaves like $|J|_\\infty \\sim 1/(t_c-t)$ for a range of sound speeds (or plasma betas). For the incompressible calculations consistency with the c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/9812017","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/physics/9812017/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":"2026-07-04T16:10:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Yb9hAaMXtcywy8WGmZvOyEFfZgSH67tHzFOId5yXAUiO0+jw3OUV+l3+Lq9ePaqi/RgIY5PWEPn85Aop6cYIBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T20:12:31.517536Z"},"content_sha256":"a7cbf61ae84618814b54afc70f9dad1ed07479f5ce9a2af24f06407fe57021c2","schema_version":"1.0","event_id":"sha256:a7cbf61ae84618814b54afc70f9dad1ed07479f5ce9a2af24f06407fe57021c2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2KC4QPABX63UPSBURNZOLMT4IR/bundle.json","state_url":"https://pith.science/pith/2KC4QPABX63UPSBURNZOLMT4IR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2KC4QPABX63UPSBURNZOLMT4IR/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":"2026-08-10T20:12:31Z","links":{"resolver":"https://pith.science/pith/2KC4QPABX63UPSBURNZOLMT4IR","bundle":"https://pith.science/pith/2KC4QPABX63UPSBURNZOLMT4IR/bundle.json","state":"https://pith.science/pith/2KC4QPABX63UPSBURNZOLMT4IR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2KC4QPABX63UPSBURNZOLMT4IR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:2KC4QPABX63UPSBURNZOLMT4IR","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":"f29d0d68782e4307d92de152f33317f3e420dd5d0b5404b634f26cdb9c8a4d76","cross_cats_sorted":["astro-ph","chao-dyn","nlin.CD"],"license":"","primary_cat":"physics.plasm-ph","submitted_at":"1998-12-10T20:27:23Z","title_canon_sha256":"2eeb05be34213621c7b175d674d1e465130fac8fe2ec3d6985bf1dd389f983d9"},"schema_version":"1.0","source":{"id":"physics/9812017","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"physics/9812017","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"arxiv_version","alias_value":"physics/9812017v2","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/9812017","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"pith_short_12","alias_value":"2KC4QPABX63U","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"pith_short_16","alias_value":"2KC4QPABX63UPSBU","created_at":"2026-07-04T16:10:26Z"},{"alias_kind":"pith_short_8","alias_value":"2KC4QPAB","created_at":"2026-07-04T16:10:26Z"}],"graph_snapshots":[{"event_id":"sha256:a7cbf61ae84618814b54afc70f9dad1ed07479f5ce9a2af24f06407fe57021c2","target":"graph","created_at":"2026-07-04T16:10:26Z","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/physics/9812017/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Numerical evidence for a finite-time singularity in ideal 3D magnetohydrodynamics (MHD) is presented. The simulations start from two interlocking magnetic flux rings with no initial velocity. The magnetic curvature force causes the flux rings to shrink until they come into contact. This produces a current sheet between them. In the ideal compressible calculations, the evidence for a singularity in a finite time $t_c$ is that the peak current density behaves like $|J|_\\infty \\sim 1/(t_c-t)$ for a range of sound speeds (or plasma betas). For the incompressible calculations consistency with the c","authors_text":"Axel Brandenburg, Robert M. Kerr","cross_cats":["astro-ph","chao-dyn","nlin.CD"],"headline":"","license":"","primary_cat":"physics.plasm-ph","submitted_at":"1998-12-10T20:27:23Z","title":"Evidence for a singularity in ideal magnetohydrodynamics: implications for fast reconnection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/9812017","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":"sha256:288c4545a47d2021d26aa64caf833adf478d8f48521e10902bc0d88bffecdd1a","target":"record","created_at":"2026-07-04T16:10:26Z","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":"f29d0d68782e4307d92de152f33317f3e420dd5d0b5404b634f26cdb9c8a4d76","cross_cats_sorted":["astro-ph","chao-dyn","nlin.CD"],"license":"","primary_cat":"physics.plasm-ph","submitted_at":"1998-12-10T20:27:23Z","title_canon_sha256":"2eeb05be34213621c7b175d674d1e465130fac8fe2ec3d6985bf1dd389f983d9"},"schema_version":"1.0","source":{"id":"physics/9812017","kind":"arxiv","version":2}},"canonical_sha256":"d285c83c01bfb747c8348b72e5b27c447d9446f710f4a946f75e9f604ea29851","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d285c83c01bfb747c8348b72e5b27c447d9446f710f4a946f75e9f604ea29851","first_computed_at":"2026-07-04T16:10:26.806782Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:10:26.806782Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TpuZX5y6OknNnGxQzzu0uqwF2pMpFxsrD0Ob7eSRy7l4ukcZIbPu5EL9bEkNtg60T5NCgNLFu1BoP1CpLZ3VDA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:10:26.807183Z","signed_message":"canonical_sha256_bytes"},"source_id":"physics/9812017","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:288c4545a47d2021d26aa64caf833adf478d8f48521e10902bc0d88bffecdd1a","sha256:a7cbf61ae84618814b54afc70f9dad1ed07479f5ce9a2af24f06407fe57021c2"],"state_sha256":"20e392d0cf7a25bf7c5dece56921af492fed56affb61560c1ec52ce41b26285f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5c8c2tpFM/jrCDSFaD1JSrgIK7EjyhI//Zm3xaCK331BDTPD0CaRnhXwtJytsLEQ6/W5OB7ndzi/7CnKyaJLDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T20:12:31.525083Z","bundle_sha256":"1f2bc3aa54f30583be77fd7eb6b120773cb76bccf5775c943b51fd8764983e83"}}