{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:PCXSIC6JX3WFXYSEYEAXP3VTWL","short_pith_number":"pith:PCXSIC6J","canonical_record":{"source":{"id":"0812.1536","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2008-12-08T19:15:21Z","cross_cats_sorted":[],"title_canon_sha256":"6df2d8237d13e9b647869a04d14754cc8bc2577255b8e4300bf37d2c05a5597d","abstract_canon_sha256":"a814ef7775ced6434e9861df7cc41b3c601f9b69986c421dd337340abe14f095"},"schema_version":"1.0"},"canonical_sha256":"78af240bc9beec5be244c10177eeb3b2c0b88da6f93ca165b0895e4c77bc125c","source":{"kind":"arxiv","id":"0812.1536","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.1536","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"arxiv_version","alias_value":"0812.1536v2","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.1536","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"pith_short_12","alias_value":"PCXSIC6JX3WF","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"pith_short_16","alias_value":"PCXSIC6JX3WFXYSE","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"pith_short_8","alias_value":"PCXSIC6J","created_at":"2026-07-04T15:46:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:PCXSIC6JX3WFXYSEYEAXP3VTWL","target":"record","payload":{"canonical_record":{"source":{"id":"0812.1536","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2008-12-08T19:15:21Z","cross_cats_sorted":[],"title_canon_sha256":"6df2d8237d13e9b647869a04d14754cc8bc2577255b8e4300bf37d2c05a5597d","abstract_canon_sha256":"a814ef7775ced6434e9861df7cc41b3c601f9b69986c421dd337340abe14f095"},"schema_version":"1.0"},"canonical_sha256":"78af240bc9beec5be244c10177eeb3b2c0b88da6f93ca165b0895e4c77bc125c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:46:18.194724Z","signature_b64":"IlID483joNIvZxPhfvdCDE5LxzmMSneshNBoe2dt3Pg+QWlTihhkRh3b+4DqEsyG8/7DIVsVDBLpeCsifsLTAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"78af240bc9beec5be244c10177eeb3b2c0b88da6f93ca165b0895e4c77bc125c","last_reissued_at":"2026-07-04T15:46:18.194386Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:46:18.194386Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0812.1536","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":"2026-07-04T15:46:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IN6T5W8C+qzFuMkz4PYqESJ4endg7Pxtwmb9GDZXf/oV/wdogoE7B9dN3TGra10X59TYByWDLEzpPxWLQndlAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T08:35:30.626572Z"},"content_sha256":"d341c0955fe9d53c8a1148e50dc1224bf58f4bd6271824c5e4c66abed3eaeeaf","schema_version":"1.0","event_id":"sha256:d341c0955fe9d53c8a1148e50dc1224bf58f4bd6271824c5e4c66abed3eaeeaf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:PCXSIC6JX3WFXYSEYEAXP3VTWL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Mountain trail formation and the active walker model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.soc-ph","authors_text":"J.P.Hague, S.J.Gilks","submitted_at":"2008-12-08T19:15:21Z","abstract_excerpt":"We extend the active walker model to address the formation of paths on gradients, which have been observed to have a zigzag form. Our extension includes a new rule which prohibits direct descent or ascent on steep inclines, simulating aversion to falling. Further augmentation of the model stops walkers from changing direction very rapidly as that would likely lead to a fall. The extended model predicts paths with qualitatively similar forms to the observed trails, but only if the terms suppressing sudden direction changes are included. The need to include terms into the model that stop rapid d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.1536","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/0812.1536/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":"2026-07-04T15:46:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/f8/ZFBMd/cvikg70efC5BzQHqFQL2pd2aWHBusKXiMT8dApN+9wtHrNasnJzqRHs4exyK1cDbS7qBzRC7lmCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T08:35:30.626937Z"},"content_sha256":"7d993db314f466a51e35a3a0ae1190f66d83061ba94bb801f722e4e664655507","schema_version":"1.0","event_id":"sha256:7d993db314f466a51e35a3a0ae1190f66d83061ba94bb801f722e4e664655507"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PCXSIC6JX3WFXYSEYEAXP3VTWL/bundle.json","state_url":"https://pith.science/pith/PCXSIC6JX3WFXYSEYEAXP3VTWL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PCXSIC6JX3WFXYSEYEAXP3VTWL/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":"2026-07-05T08:35:30Z","links":{"resolver":"https://pith.science/pith/PCXSIC6JX3WFXYSEYEAXP3VTWL","bundle":"https://pith.science/pith/PCXSIC6JX3WFXYSEYEAXP3VTWL/bundle.json","state":"https://pith.science/pith/PCXSIC6JX3WFXYSEYEAXP3VTWL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PCXSIC6JX3WFXYSEYEAXP3VTWL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:PCXSIC6JX3WFXYSEYEAXP3VTWL","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":"a814ef7775ced6434e9861df7cc41b3c601f9b69986c421dd337340abe14f095","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2008-12-08T19:15:21Z","title_canon_sha256":"6df2d8237d13e9b647869a04d14754cc8bc2577255b8e4300bf37d2c05a5597d"},"schema_version":"1.0","source":{"id":"0812.1536","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.1536","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"arxiv_version","alias_value":"0812.1536v2","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.1536","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"pith_short_12","alias_value":"PCXSIC6JX3WF","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"pith_short_16","alias_value":"PCXSIC6JX3WFXYSE","created_at":"2026-07-04T15:46:18Z"},{"alias_kind":"pith_short_8","alias_value":"PCXSIC6J","created_at":"2026-07-04T15:46:18Z"}],"graph_snapshots":[{"event_id":"sha256:7d993db314f466a51e35a3a0ae1190f66d83061ba94bb801f722e4e664655507","target":"graph","created_at":"2026-07-04T15:46:18Z","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/0812.1536/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We extend the active walker model to address the formation of paths on gradients, which have been observed to have a zigzag form. Our extension includes a new rule which prohibits direct descent or ascent on steep inclines, simulating aversion to falling. Further augmentation of the model stops walkers from changing direction very rapidly as that would likely lead to a fall. The extended model predicts paths with qualitatively similar forms to the observed trails, but only if the terms suppressing sudden direction changes are included. The need to include terms into the model that stop rapid d","authors_text":"J.P.Hague, S.J.Gilks","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2008-12-08T19:15:21Z","title":"Mountain trail formation and the active walker model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.1536","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:d341c0955fe9d53c8a1148e50dc1224bf58f4bd6271824c5e4c66abed3eaeeaf","target":"record","created_at":"2026-07-04T15:46:18Z","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":"a814ef7775ced6434e9861df7cc41b3c601f9b69986c421dd337340abe14f095","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2008-12-08T19:15:21Z","title_canon_sha256":"6df2d8237d13e9b647869a04d14754cc8bc2577255b8e4300bf37d2c05a5597d"},"schema_version":"1.0","source":{"id":"0812.1536","kind":"arxiv","version":2}},"canonical_sha256":"78af240bc9beec5be244c10177eeb3b2c0b88da6f93ca165b0895e4c77bc125c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"78af240bc9beec5be244c10177eeb3b2c0b88da6f93ca165b0895e4c77bc125c","first_computed_at":"2026-07-04T15:46:18.194386Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:46:18.194386Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IlID483joNIvZxPhfvdCDE5LxzmMSneshNBoe2dt3Pg+QWlTihhkRh3b+4DqEsyG8/7DIVsVDBLpeCsifsLTAw==","signature_status":"signed_v1","signed_at":"2026-07-04T15:46:18.194724Z","signed_message":"canonical_sha256_bytes"},"source_id":"0812.1536","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d341c0955fe9d53c8a1148e50dc1224bf58f4bd6271824c5e4c66abed3eaeeaf","sha256:7d993db314f466a51e35a3a0ae1190f66d83061ba94bb801f722e4e664655507"],"state_sha256":"57cde19bf4f9e4df38bd4ce09cba759d3ca3975cb048b8650c28576a26fdbab5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TBOxEZHwuMzyuFS7Ovn3hC8PGCla4jcnhkdrC9rw5TWICZ2WfYAGvlOp5B83EHouocejekfpgDX1OTsXfzYrBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T08:35:30.628902Z","bundle_sha256":"47bf2ed1e1444aa14ab4fcf22db03996645e0fcd35cea9be399fb58fda0a8db1"}}