{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:K27W2DNSDY5CKDPXR65SIOKTLA","short_pith_number":"pith:K27W2DNS","canonical_record":{"source":{"id":"1908.08751","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2019-08-23T10:34:09Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"f1415409600219d87a4c30a3de64b88e80209948765273f0c8286749e0d69b60","abstract_canon_sha256":"6344637f3fa6de302df479cd4386eb293cb7c2c090934a97e6475feca89d208a"},"schema_version":"1.0"},"canonical_sha256":"56bf6d0db21e3a250df78fbb243953583fc6519bfd136832ba0f97fba2dfd108","source":{"kind":"arxiv","id":"1908.08751","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.08751","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"arxiv_version","alias_value":"1908.08751v2","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08751","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"pith_short_12","alias_value":"K27W2DNSDY5C","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"pith_short_16","alias_value":"K27W2DNSDY5CKDPX","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"pith_short_8","alias_value":"K27W2DNS","created_at":"2026-07-05T00:28:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:K27W2DNSDY5CKDPXR65SIOKTLA","target":"record","payload":{"canonical_record":{"source":{"id":"1908.08751","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2019-08-23T10:34:09Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"f1415409600219d87a4c30a3de64b88e80209948765273f0c8286749e0d69b60","abstract_canon_sha256":"6344637f3fa6de302df479cd4386eb293cb7c2c090934a97e6475feca89d208a"},"schema_version":"1.0"},"canonical_sha256":"56bf6d0db21e3a250df78fbb243953583fc6519bfd136832ba0f97fba2dfd108","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:28:12.207697Z","signature_b64":"NecPukQbnU2kxJrLy+wvjuayOp9pkxNa2AT7dKH4G7kA5t/pHf2PWUwgzFSz6d8ZVTYvQxtAuy8NYXHQTpTCBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"56bf6d0db21e3a250df78fbb243953583fc6519bfd136832ba0f97fba2dfd108","last_reissued_at":"2026-07-05T00:28:12.207175Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:28:12.207175Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.08751","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":"2026-07-05T00:28:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E6pyEGhtYRdSxJ4YZJAEjVl/6iwKziUHR60KZQsS5iH67L3rT7tDxeQTCFrQ9JEc0k4KbsrDdMKs/ANQrliXBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T06:14:14.352526Z"},"content_sha256":"8762310252f989b8d034a509018026a598c1396e4323bc93befc621b9aa5fd96","schema_version":"1.0","event_id":"sha256:8762310252f989b8d034a509018026a598c1396e4323bc93befc621b9aa5fd96"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:K27W2DNSDY5CKDPXR65SIOKTLA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Threaded rings that swim in excitable media","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft"],"primary_cat":"nlin.PS","authors_text":"Andrew Lobb, Antonio Cincotti, Brette M. Chapin, David Evans, Elizabeth Bromley, Fabian Maucher, Jonathan W. Steed, Kate Horner, Paul Sutcliffe","submitted_at":"2019-08-23T10:34:09Z","abstract_excerpt":"Cardiac tissue and the Belousov-Zhabotinsky reaction provide two notable examples of excitable media that support scroll waves, in which a filament core is the source of spiral waves of excitation. Here we consider a novel topological configuration in which a closed filament loop, known as a scroll ring, is threaded by a pair of counter-rotating filaments that are perpendicular to the plane of the ring and end on the boundary of a thin medium. We simulate the dynamics of this threaded ring (thring) in the photosensitive Belousov-Zhabotinsky excitable medium, using the modified Oregonator react"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08751","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/1908.08751/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":"2026-07-05T00:28:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3iok1FrnoGcVgME8/l7T/gJtdCkYlqES9o+pxWol1vpQHoQf6RpajyVU71DXXZyA48IRLtX9Lvg76ZKwJVuVCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T06:14:14.353063Z"},"content_sha256":"c3d5efa4c87db0490a9aaa9b42deddb0252ea280f78002cd7b1b459ba1ce36a8","schema_version":"1.0","event_id":"sha256:c3d5efa4c87db0490a9aaa9b42deddb0252ea280f78002cd7b1b459ba1ce36a8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/K27W2DNSDY5CKDPXR65SIOKTLA/bundle.json","state_url":"https://pith.science/pith/K27W2DNSDY5CKDPXR65SIOKTLA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/K27W2DNSDY5CKDPXR65SIOKTLA/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":"2026-08-16T06:14:14Z","links":{"resolver":"https://pith.science/pith/K27W2DNSDY5CKDPXR65SIOKTLA","bundle":"https://pith.science/pith/K27W2DNSDY5CKDPXR65SIOKTLA/bundle.json","state":"https://pith.science/pith/K27W2DNSDY5CKDPXR65SIOKTLA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/K27W2DNSDY5CKDPXR65SIOKTLA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:K27W2DNSDY5CKDPXR65SIOKTLA","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":"6344637f3fa6de302df479cd4386eb293cb7c2c090934a97e6475feca89d208a","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2019-08-23T10:34:09Z","title_canon_sha256":"f1415409600219d87a4c30a3de64b88e80209948765273f0c8286749e0d69b60"},"schema_version":"1.0","source":{"id":"1908.08751","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.08751","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"arxiv_version","alias_value":"1908.08751v2","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08751","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"pith_short_12","alias_value":"K27W2DNSDY5C","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"pith_short_16","alias_value":"K27W2DNSDY5CKDPX","created_at":"2026-07-05T00:28:12Z"},{"alias_kind":"pith_short_8","alias_value":"K27W2DNS","created_at":"2026-07-05T00:28:12Z"}],"graph_snapshots":[{"event_id":"sha256:c3d5efa4c87db0490a9aaa9b42deddb0252ea280f78002cd7b1b459ba1ce36a8","target":"graph","created_at":"2026-07-05T00:28:12Z","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/1908.08751/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Cardiac tissue and the Belousov-Zhabotinsky reaction provide two notable examples of excitable media that support scroll waves, in which a filament core is the source of spiral waves of excitation. Here we consider a novel topological configuration in which a closed filament loop, known as a scroll ring, is threaded by a pair of counter-rotating filaments that are perpendicular to the plane of the ring and end on the boundary of a thin medium. We simulate the dynamics of this threaded ring (thring) in the photosensitive Belousov-Zhabotinsky excitable medium, using the modified Oregonator react","authors_text":"Andrew Lobb, Antonio Cincotti, Brette M. Chapin, David Evans, Elizabeth Bromley, Fabian Maucher, Jonathan W. Steed, Kate Horner, Paul Sutcliffe","cross_cats":["cond-mat.soft"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2019-08-23T10:34:09Z","title":"Threaded rings that swim in excitable media"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08751","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":"sha256:8762310252f989b8d034a509018026a598c1396e4323bc93befc621b9aa5fd96","target":"record","created_at":"2026-07-05T00:28:12Z","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":"6344637f3fa6de302df479cd4386eb293cb7c2c090934a97e6475feca89d208a","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2019-08-23T10:34:09Z","title_canon_sha256":"f1415409600219d87a4c30a3de64b88e80209948765273f0c8286749e0d69b60"},"schema_version":"1.0","source":{"id":"1908.08751","kind":"arxiv","version":2}},"canonical_sha256":"56bf6d0db21e3a250df78fbb243953583fc6519bfd136832ba0f97fba2dfd108","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"56bf6d0db21e3a250df78fbb243953583fc6519bfd136832ba0f97fba2dfd108","first_computed_at":"2026-07-05T00:28:12.207175Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:28:12.207175Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NecPukQbnU2kxJrLy+wvjuayOp9pkxNa2AT7dKH4G7kA5t/pHf2PWUwgzFSz6d8ZVTYvQxtAuy8NYXHQTpTCBw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:28:12.207697Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.08751","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8762310252f989b8d034a509018026a598c1396e4323bc93befc621b9aa5fd96","sha256:c3d5efa4c87db0490a9aaa9b42deddb0252ea280f78002cd7b1b459ba1ce36a8"],"state_sha256":"5cf932d97f1684b540f665de7c0909921404f0e708f82a95d67f19d84ab991ad"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MC7d6tEkk/iM1sAcgEhQ6ExjQsjhuv0O8PMu/KSF/Lo/kPrYKo2NivM7+6rhDi+bgAol2c6a2i/kxGe0P51cAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T06:14:14.358652Z","bundle_sha256":"d09d19bc75ad1a3bf022c4a71cf3944924eb2145644efaa9a29d303204150b60"}}