{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:R5TBHU7ZVLY34TTCMKBVQ6VULP","short_pith_number":"pith:R5TBHU7Z","canonical_record":{"source":{"id":"1709.02996","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CG","submitted_at":"2017-09-09T19:20:43Z","cross_cats_sorted":[],"title_canon_sha256":"4706013e2d716431ff4bb6a0134a9f0ed862ea5f629b329652e0934d413cfef8","abstract_canon_sha256":"a6b387a892d42a7e0474974556a26c75bd9e84cb149ce1c741733b878dbacecc"},"schema_version":"1.0"},"canonical_sha256":"8f6613d3f9aaf1be4e626283587ab45bf3c6609df25183c729fd1e4a7f85f01b","source":{"kind":"arxiv","id":"1709.02996","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.02996","created_at":"2026-05-18T00:30:16Z"},{"alias_kind":"arxiv_version","alias_value":"1709.02996v2","created_at":"2026-05-18T00:30:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.02996","created_at":"2026-05-18T00:30:16Z"},{"alias_kind":"pith_short_12","alias_value":"R5TBHU7ZVLY3","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"R5TBHU7ZVLY34TTC","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"R5TBHU7Z","created_at":"2026-05-18T12:31:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:R5TBHU7ZVLY34TTCMKBVQ6VULP","target":"record","payload":{"canonical_record":{"source":{"id":"1709.02996","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CG","submitted_at":"2017-09-09T19:20:43Z","cross_cats_sorted":[],"title_canon_sha256":"4706013e2d716431ff4bb6a0134a9f0ed862ea5f629b329652e0934d413cfef8","abstract_canon_sha256":"a6b387a892d42a7e0474974556a26c75bd9e84cb149ce1c741733b878dbacecc"},"schema_version":"1.0"},"canonical_sha256":"8f6613d3f9aaf1be4e626283587ab45bf3c6609df25183c729fd1e4a7f85f01b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:30:16.422465Z","signature_b64":"AqpU648zin8x1rl4Oeatdy5vfpSLsrO5DON2DMAWZGeMGORiD4HFtUymihpwCAO6Wp/ZtwO2ehf5aBSKEcLwDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8f6613d3f9aaf1be4e626283587ab45bf3c6609df25183c729fd1e4a7f85f01b","last_reissued_at":"2026-05-18T00:30:16.421590Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:30:16.421590Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1709.02996","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":"2026-05-18T00:30:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZWI27ONioG2be9Ro81Qw9mdi34ypIcwkPyM3HN7l4jW0wCegBMQKts+2TLIg7wwaxkEL9q+pGaGU5bCadkYpAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T17:58:47.677454Z"},"content_sha256":"c6f5f78cd0843372f38c8a71e66fee3f4294ccb19bc9d3854ad006e6f98a95fc","schema_version":"1.0","event_id":"sha256:c6f5f78cd0843372f38c8a71e66fee3f4294ccb19bc9d3854ad006e6f98a95fc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:R5TBHU7ZVLY34TTCMKBVQ6VULP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Special Guards in Chromatic Art Gallery","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CG","authors_text":"Hamid Hoorfar","submitted_at":"2017-09-09T19:20:43Z","abstract_excerpt":"We present two new versions of the chromatic art gallery problem that can improve upper bound of the required colors pretty well. In our version, we employ restricted angle guards so that these modern guards can visit $\\alpha$-degree of their surroundings. If $\\alpha$ is between $0$ and $180$ degree, we demonstrate that the strong chromatic guarding number is constant. Then we use orthogonal $90$-degree guards for guarding the polygons. We prove that the strong chromatic guarding number with orthogonal guards is the logarithmic order. First, we show that for the special cases of the orthogonal"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.02996","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":"2026-05-18T00:30:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VCersDOhORvyboYJF67ndiwyhA1mH25q5CJMnTXftCfekqOOJpz3V9aJt9GjBMUKQHasXjRrbcX9Ov4RCFBPCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T17:58:47.677792Z"},"content_sha256":"64d0a45ecb0c61e8210d3acb5bdcf448460f536d3a729e870ad1156145c66758","schema_version":"1.0","event_id":"sha256:64d0a45ecb0c61e8210d3acb5bdcf448460f536d3a729e870ad1156145c66758"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R5TBHU7ZVLY34TTCMKBVQ6VULP/bundle.json","state_url":"https://pith.science/pith/R5TBHU7ZVLY34TTCMKBVQ6VULP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R5TBHU7ZVLY34TTCMKBVQ6VULP/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":"2026-06-09T17:58:47Z","links":{"resolver":"https://pith.science/pith/R5TBHU7ZVLY34TTCMKBVQ6VULP","bundle":"https://pith.science/pith/R5TBHU7ZVLY34TTCMKBVQ6VULP/bundle.json","state":"https://pith.science/pith/R5TBHU7ZVLY34TTCMKBVQ6VULP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R5TBHU7ZVLY34TTCMKBVQ6VULP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:R5TBHU7ZVLY34TTCMKBVQ6VULP","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":"a6b387a892d42a7e0474974556a26c75bd9e84cb149ce1c741733b878dbacecc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CG","submitted_at":"2017-09-09T19:20:43Z","title_canon_sha256":"4706013e2d716431ff4bb6a0134a9f0ed862ea5f629b329652e0934d413cfef8"},"schema_version":"1.0","source":{"id":"1709.02996","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.02996","created_at":"2026-05-18T00:30:16Z"},{"alias_kind":"arxiv_version","alias_value":"1709.02996v2","created_at":"2026-05-18T00:30:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.02996","created_at":"2026-05-18T00:30:16Z"},{"alias_kind":"pith_short_12","alias_value":"R5TBHU7ZVLY3","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"R5TBHU7ZVLY34TTC","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"R5TBHU7Z","created_at":"2026-05-18T12:31:39Z"}],"graph_snapshots":[{"event_id":"sha256:64d0a45ecb0c61e8210d3acb5bdcf448460f536d3a729e870ad1156145c66758","target":"graph","created_at":"2026-05-18T00:30:16Z","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":"We present two new versions of the chromatic art gallery problem that can improve upper bound of the required colors pretty well. In our version, we employ restricted angle guards so that these modern guards can visit $\\alpha$-degree of their surroundings. If $\\alpha$ is between $0$ and $180$ degree, we demonstrate that the strong chromatic guarding number is constant. Then we use orthogonal $90$-degree guards for guarding the polygons. We prove that the strong chromatic guarding number with orthogonal guards is the logarithmic order. First, we show that for the special cases of the orthogonal","authors_text":"Hamid Hoorfar","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CG","submitted_at":"2017-09-09T19:20:43Z","title":"Special Guards in Chromatic Art Gallery"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.02996","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:c6f5f78cd0843372f38c8a71e66fee3f4294ccb19bc9d3854ad006e6f98a95fc","target":"record","created_at":"2026-05-18T00:30:16Z","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":"a6b387a892d42a7e0474974556a26c75bd9e84cb149ce1c741733b878dbacecc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CG","submitted_at":"2017-09-09T19:20:43Z","title_canon_sha256":"4706013e2d716431ff4bb6a0134a9f0ed862ea5f629b329652e0934d413cfef8"},"schema_version":"1.0","source":{"id":"1709.02996","kind":"arxiv","version":2}},"canonical_sha256":"8f6613d3f9aaf1be4e626283587ab45bf3c6609df25183c729fd1e4a7f85f01b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8f6613d3f9aaf1be4e626283587ab45bf3c6609df25183c729fd1e4a7f85f01b","first_computed_at":"2026-05-18T00:30:16.421590Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:30:16.421590Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AqpU648zin8x1rl4Oeatdy5vfpSLsrO5DON2DMAWZGeMGORiD4HFtUymihpwCAO6Wp/ZtwO2ehf5aBSKEcLwDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:30:16.422465Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.02996","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c6f5f78cd0843372f38c8a71e66fee3f4294ccb19bc9d3854ad006e6f98a95fc","sha256:64d0a45ecb0c61e8210d3acb5bdcf448460f536d3a729e870ad1156145c66758"],"state_sha256":"cce465515d8a39d212ca77023183f4efb45a7f7d443c2507edd8481249a95ca8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"htwAHHEVf60NPbVxNT/szQnh4b+m/sClyuJsrbmODNZBH3p4W/ntbLwl41ya+YoKq1pUNCyvNYGWtu7G4WyDCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T17:58:47.679675Z","bundle_sha256":"6d35ac3a1a2503dcf56ce604b073f6363e5079ea886a2b137bafb196ebb512fc"}}