{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:QTLWXKJ7MZRTF4ZOZJQHVUP2G3","short_pith_number":"pith:QTLWXKJ7","canonical_record":{"source":{"id":"1308.2614","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/3.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-08-12T16:23:50Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"953ef081b01917ada0a62ac65262f90e504ffd54045c733b50ac0237f581adcb","abstract_canon_sha256":"9a1511598242d0f24dca5849dd003e2c6cbb8d40adc0d5b24d9cd32ac8a1890f"},"schema_version":"1.0"},"canonical_sha256":"84d76ba93f666332f32eca607ad1fa36feec3cbeaf89f890701394c2a3f6644a","source":{"kind":"arxiv","id":"1308.2614","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.2614","created_at":"2026-05-18T03:16:06Z"},{"alias_kind":"arxiv_version","alias_value":"1308.2614v1","created_at":"2026-05-18T03:16:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.2614","created_at":"2026-05-18T03:16:06Z"},{"alias_kind":"pith_short_12","alias_value":"QTLWXKJ7MZRT","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"QTLWXKJ7MZRTF4ZO","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"QTLWXKJ7","created_at":"2026-05-18T12:27:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:QTLWXKJ7MZRTF4ZOZJQHVUP2G3","target":"record","payload":{"canonical_record":{"source":{"id":"1308.2614","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/3.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-08-12T16:23:50Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"953ef081b01917ada0a62ac65262f90e504ffd54045c733b50ac0237f581adcb","abstract_canon_sha256":"9a1511598242d0f24dca5849dd003e2c6cbb8d40adc0d5b24d9cd32ac8a1890f"},"schema_version":"1.0"},"canonical_sha256":"84d76ba93f666332f32eca607ad1fa36feec3cbeaf89f890701394c2a3f6644a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:16:06.969445Z","signature_b64":"QFA40UKGcwHUi3S/oCqoK0yDTqDRfG4reowzSK/XiRxuKDERm2xq1gPagqXT2F3PBE7n40QXOxw2DBiF8OwTBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"84d76ba93f666332f32eca607ad1fa36feec3cbeaf89f890701394c2a3f6644a","last_reissued_at":"2026-05-18T03:16:06.969010Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:16:06.969010Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.2614","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:16:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U8ez/JfjBrhbPJgpB1QSce5I5qTef3h/vOrY4qDWAmA51OrZEcxUYBVKwYMZ9JESHD7OEEpBwRjGpJ7YXruMDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T12:39:30.889070Z"},"content_sha256":"e5cff8619996788b8a360c83ec7ace9a8bf213bc30408a882e7ae1def2fd4450","schema_version":"1.0","event_id":"sha256:e5cff8619996788b8a360c83ec7ace9a8bf213bc30408a882e7ae1def2fd4450"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:QTLWXKJ7MZRTF4ZOZJQHVUP2G3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Open Source Physics","license":"http://creativecommons.org/licenses/by/3.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"physics.ed-ph","authors_text":"Loo Kang Wee","submitted_at":"2013-08-12T16:23:50Z","abstract_excerpt":"Open Source Physics (Brown, 2012; Christian, 2010; Esquembre, 2012; Hwang, 2010) empowers teachers and students to create and use these free tools with the associated intellectual property rights given to customise (Wee & Mak, 2009) the computer models/tools to suit their teaching and learning needs. Open Source Physics (OSP) focuses on design of computer models, such as Easy Java Simulations (EJS) and the use of video modeling and analysis (Tracker). They allow students to investigate, explore and analyse data which is either real or simulated. The OSP approach helps users overcome barriers i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.2614","kind":"arxiv","version":1},"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":"2026-05-18T03:16:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NP7ddsWYuoXvq9yFRGBbzKpg31b4G/dGwiH0ahs0xDOUqo+8vv+GJhR9O8BR9G9qYa9jkn+yZoi/X1VUSwbvDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T12:39:30.889437Z"},"content_sha256":"2f73dff0b24c2ea87d0c48770d1e0c5b20e36189db3fd6874a3add43bf112f16","schema_version":"1.0","event_id":"sha256:2f73dff0b24c2ea87d0c48770d1e0c5b20e36189db3fd6874a3add43bf112f16"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QTLWXKJ7MZRTF4ZOZJQHVUP2G3/bundle.json","state_url":"https://pith.science/pith/QTLWXKJ7MZRTF4ZOZJQHVUP2G3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QTLWXKJ7MZRTF4ZOZJQHVUP2G3/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":"2026-07-01T12:39:30Z","links":{"resolver":"https://pith.science/pith/QTLWXKJ7MZRTF4ZOZJQHVUP2G3","bundle":"https://pith.science/pith/QTLWXKJ7MZRTF4ZOZJQHVUP2G3/bundle.json","state":"https://pith.science/pith/QTLWXKJ7MZRTF4ZOZJQHVUP2G3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QTLWXKJ7MZRTF4ZOZJQHVUP2G3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:QTLWXKJ7MZRTF4ZOZJQHVUP2G3","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":"9a1511598242d0f24dca5849dd003e2c6cbb8d40adc0d5b24d9cd32ac8a1890f","cross_cats_sorted":["physics.comp-ph"],"license":"http://creativecommons.org/licenses/by/3.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-08-12T16:23:50Z","title_canon_sha256":"953ef081b01917ada0a62ac65262f90e504ffd54045c733b50ac0237f581adcb"},"schema_version":"1.0","source":{"id":"1308.2614","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.2614","created_at":"2026-05-18T03:16:06Z"},{"alias_kind":"arxiv_version","alias_value":"1308.2614v1","created_at":"2026-05-18T03:16:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.2614","created_at":"2026-05-18T03:16:06Z"},{"alias_kind":"pith_short_12","alias_value":"QTLWXKJ7MZRT","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"QTLWXKJ7MZRTF4ZO","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"QTLWXKJ7","created_at":"2026-05-18T12:27:57Z"}],"graph_snapshots":[{"event_id":"sha256:2f73dff0b24c2ea87d0c48770d1e0c5b20e36189db3fd6874a3add43bf112f16","target":"graph","created_at":"2026-05-18T03:16:06Z","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":"Open Source Physics (Brown, 2012; Christian, 2010; Esquembre, 2012; Hwang, 2010) empowers teachers and students to create and use these free tools with the associated intellectual property rights given to customise (Wee & Mak, 2009) the computer models/tools to suit their teaching and learning needs. Open Source Physics (OSP) focuses on design of computer models, such as Easy Java Simulations (EJS) and the use of video modeling and analysis (Tracker). They allow students to investigate, explore and analyse data which is either real or simulated. The OSP approach helps users overcome barriers i","authors_text":"Loo Kang Wee","cross_cats":["physics.comp-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/3.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-08-12T16:23:50Z","title":"Open Source Physics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.2614","kind":"arxiv","version":1},"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:e5cff8619996788b8a360c83ec7ace9a8bf213bc30408a882e7ae1def2fd4450","target":"record","created_at":"2026-05-18T03:16:06Z","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":"9a1511598242d0f24dca5849dd003e2c6cbb8d40adc0d5b24d9cd32ac8a1890f","cross_cats_sorted":["physics.comp-ph"],"license":"http://creativecommons.org/licenses/by/3.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-08-12T16:23:50Z","title_canon_sha256":"953ef081b01917ada0a62ac65262f90e504ffd54045c733b50ac0237f581adcb"},"schema_version":"1.0","source":{"id":"1308.2614","kind":"arxiv","version":1}},"canonical_sha256":"84d76ba93f666332f32eca607ad1fa36feec3cbeaf89f890701394c2a3f6644a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"84d76ba93f666332f32eca607ad1fa36feec3cbeaf89f890701394c2a3f6644a","first_computed_at":"2026-05-18T03:16:06.969010Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:16:06.969010Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QFA40UKGcwHUi3S/oCqoK0yDTqDRfG4reowzSK/XiRxuKDERm2xq1gPagqXT2F3PBE7n40QXOxw2DBiF8OwTBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:16:06.969445Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.2614","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e5cff8619996788b8a360c83ec7ace9a8bf213bc30408a882e7ae1def2fd4450","sha256:2f73dff0b24c2ea87d0c48770d1e0c5b20e36189db3fd6874a3add43bf112f16"],"state_sha256":"7b4c32b7041e53424c152a6afcec6d5be31d276cda6a1e73a4c782d39658b304"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JUimTJ/0uqHl9wKN11ca/bsfq1+qB/txdDSHydgAd0LS4mUMIxe7C3Ouq5RiWSHq6rne6HxcRlR8ug2Wz/HFBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-01T12:39:30.891543Z","bundle_sha256":"042c8e97dda57babee299a03e69b3ade4d8cebea6fc078112bcaae909c4cb7ac"}}