{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:KLPZ4XDK5HPLIOASDNDAHZ3NM6","short_pith_number":"pith:KLPZ4XDK","canonical_record":{"source":{"id":"1801.00964","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2018-01-03T11:43:12Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"e7cbc0ee3867f02f34e0ab7a38b2ad0898333770a8f764d99f973704a6d32bc2","abstract_canon_sha256":"5724d583e4918624741a63149ab59eb3f8c4e50502f64c7631dca7ed6785e22f"},"schema_version":"1.0"},"canonical_sha256":"52df9e5c6ae9deb438121b4603e76d678af7a3a12b97b188f6e0efdb80d6e52b","source":{"kind":"arxiv","id":"1801.00964","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.00964","created_at":"2026-05-18T00:13:04Z"},{"alias_kind":"arxiv_version","alias_value":"1801.00964v2","created_at":"2026-05-18T00:13:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.00964","created_at":"2026-05-18T00:13:04Z"},{"alias_kind":"pith_short_12","alias_value":"KLPZ4XDK5HPL","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"KLPZ4XDK5HPLIOAS","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"KLPZ4XDK","created_at":"2026-05-18T12:32:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:KLPZ4XDK5HPLIOASDNDAHZ3NM6","target":"record","payload":{"canonical_record":{"source":{"id":"1801.00964","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2018-01-03T11:43:12Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"e7cbc0ee3867f02f34e0ab7a38b2ad0898333770a8f764d99f973704a6d32bc2","abstract_canon_sha256":"5724d583e4918624741a63149ab59eb3f8c4e50502f64c7631dca7ed6785e22f"},"schema_version":"1.0"},"canonical_sha256":"52df9e5c6ae9deb438121b4603e76d678af7a3a12b97b188f6e0efdb80d6e52b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:13:04.847289Z","signature_b64":"7ySID9F1TMmCDuaR6OQrTXQxfJz7sK8Peb7dFgjSRwUpUZsalSOes7Lp5RpEQt4mmBrB/55GLP3LBnRtHp7JCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"52df9e5c6ae9deb438121b4603e76d678af7a3a12b97b188f6e0efdb80d6e52b","last_reissued_at":"2026-05-18T00:13:04.846595Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:13:04.846595Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.00964","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":"2026-05-18T00:13:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bc+3yNWGPIUXGTDGkYi1ecNq+090Uqfepd9L09hovgZmx5wjOVdTQzhNuiVp770bXRtFmhxn0QY/2zpabb0QBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T22:40:17.467474Z"},"content_sha256":"32e572be7a810a0bf436ee3a4ae7c5f72810735f6ebd82c302a457af4c946d9a","schema_version":"1.0","event_id":"sha256:32e572be7a810a0bf436ee3a4ae7c5f72810735f6ebd82c302a457af4c946d9a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:KLPZ4XDK5HPLIOASDNDAHZ3NM6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tree crowns grow into self-similar shapes controlled by gravity and light sensing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft"],"primary_cat":"physics.bio-ph","authors_text":"B. Moulia, C. Eloy, E. Badel, L. Duchemin","submitted_at":"2018-01-03T11:43:12Z","abstract_excerpt":"Plants have developed different tropisms: in particular, they re-orient the growth of their branches towards light (phototropism) or upwards (gravitropism). How these tropisms affect the shape of a tree crown remains unanswered. We address this question by developing a propagating front model of tree growth. This model being length-free, it leads to self-similar solutions, independent of the initial conditions, at long time. Varying the intensities of each tropism, different self-similar shapes emerge, including singular ones. Interestingly, these shapes bear similarities with existing tree sp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.00964","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":""},"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":"2026-05-18T00:13:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m57W7+0S7AHfJ7orv+X1/E4tZbI90f8j0am1aOePlJdtrGhdPN3xWpdf5mTaAPVQugwcCk9Xa3JEwDVNV2gRCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T22:40:17.468179Z"},"content_sha256":"906dc0d66f25ab11f0fb77dc96ddc0bb389a6d86e0f4c2d0d85143367f003727","schema_version":"1.0","event_id":"sha256:906dc0d66f25ab11f0fb77dc96ddc0bb389a6d86e0f4c2d0d85143367f003727"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KLPZ4XDK5HPLIOASDNDAHZ3NM6/bundle.json","state_url":"https://pith.science/pith/KLPZ4XDK5HPLIOASDNDAHZ3NM6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KLPZ4XDK5HPLIOASDNDAHZ3NM6/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":"2026-06-07T22:40:17Z","links":{"resolver":"https://pith.science/pith/KLPZ4XDK5HPLIOASDNDAHZ3NM6","bundle":"https://pith.science/pith/KLPZ4XDK5HPLIOASDNDAHZ3NM6/bundle.json","state":"https://pith.science/pith/KLPZ4XDK5HPLIOASDNDAHZ3NM6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KLPZ4XDK5HPLIOASDNDAHZ3NM6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:KLPZ4XDK5HPLIOASDNDAHZ3NM6","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":"5724d583e4918624741a63149ab59eb3f8c4e50502f64c7631dca7ed6785e22f","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2018-01-03T11:43:12Z","title_canon_sha256":"e7cbc0ee3867f02f34e0ab7a38b2ad0898333770a8f764d99f973704a6d32bc2"},"schema_version":"1.0","source":{"id":"1801.00964","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.00964","created_at":"2026-05-18T00:13:04Z"},{"alias_kind":"arxiv_version","alias_value":"1801.00964v2","created_at":"2026-05-18T00:13:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.00964","created_at":"2026-05-18T00:13:04Z"},{"alias_kind":"pith_short_12","alias_value":"KLPZ4XDK5HPL","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"KLPZ4XDK5HPLIOAS","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"KLPZ4XDK","created_at":"2026-05-18T12:32:33Z"}],"graph_snapshots":[{"event_id":"sha256:906dc0d66f25ab11f0fb77dc96ddc0bb389a6d86e0f4c2d0d85143367f003727","target":"graph","created_at":"2026-05-18T00:13:04Z","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"},"paper":{"abstract_excerpt":"Plants have developed different tropisms: in particular, they re-orient the growth of their branches towards light (phototropism) or upwards (gravitropism). How these tropisms affect the shape of a tree crown remains unanswered. We address this question by developing a propagating front model of tree growth. This model being length-free, it leads to self-similar solutions, independent of the initial conditions, at long time. Varying the intensities of each tropism, different self-similar shapes emerge, including singular ones. Interestingly, these shapes bear similarities with existing tree sp","authors_text":"B. Moulia, C. Eloy, E. Badel, L. Duchemin","cross_cats":["cond-mat.soft"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2018-01-03T11:43:12Z","title":"Tree crowns grow into self-similar shapes controlled by gravity and light sensing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.00964","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":"sha256:32e572be7a810a0bf436ee3a4ae7c5f72810735f6ebd82c302a457af4c946d9a","target":"record","created_at":"2026-05-18T00:13:04Z","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":"5724d583e4918624741a63149ab59eb3f8c4e50502f64c7631dca7ed6785e22f","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2018-01-03T11:43:12Z","title_canon_sha256":"e7cbc0ee3867f02f34e0ab7a38b2ad0898333770a8f764d99f973704a6d32bc2"},"schema_version":"1.0","source":{"id":"1801.00964","kind":"arxiv","version":2}},"canonical_sha256":"52df9e5c6ae9deb438121b4603e76d678af7a3a12b97b188f6e0efdb80d6e52b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"52df9e5c6ae9deb438121b4603e76d678af7a3a12b97b188f6e0efdb80d6e52b","first_computed_at":"2026-05-18T00:13:04.846595Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:13:04.846595Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7ySID9F1TMmCDuaR6OQrTXQxfJz7sK8Peb7dFgjSRwUpUZsalSOes7Lp5RpEQt4mmBrB/55GLP3LBnRtHp7JCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:13:04.847289Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.00964","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:32e572be7a810a0bf436ee3a4ae7c5f72810735f6ebd82c302a457af4c946d9a","sha256:906dc0d66f25ab11f0fb77dc96ddc0bb389a6d86e0f4c2d0d85143367f003727"],"state_sha256":"5b553f6d27a450b931f454040e2680635a917a48b60b7919c8f59b2940d7a61b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pl5Kr3rRCfb+stdskrSs4ijjqWpRClZN6N3osHuuro4Sa8gCUYBHM7Ttji3ACvTeg/QirsponBtD3BG0hkXcAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T22:40:17.472469Z","bundle_sha256":"fcb98445bdb4c6f39dff31fd380d74d12218dc09dab5de047116d0cff924d405"}}