{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:MPF2E54ZSGWMABGCBCNYLXOE5D","short_pith_number":"pith:MPF2E54Z","canonical_record":{"source":{"id":"1310.4868","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-10-17T23:07:54Z","cross_cats_sorted":[],"title_canon_sha256":"85491990ea0b7a6c7f0bf42902d35140810a972c838e281ce8614b0404048a4b","abstract_canon_sha256":"846c344e47af952b9f80b98828608a428794a3ad292a8bb03455626bcbff1ea3"},"schema_version":"1.0"},"canonical_sha256":"63cba2779991acc004c2089b85ddc4e8c33b84cbf1b389a075fdabb351060203","source":{"kind":"arxiv","id":"1310.4868","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.4868","created_at":"2026-05-18T01:23:16Z"},{"alias_kind":"arxiv_version","alias_value":"1310.4868v2","created_at":"2026-05-18T01:23:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.4868","created_at":"2026-05-18T01:23:16Z"},{"alias_kind":"pith_short_12","alias_value":"MPF2E54ZSGWM","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MPF2E54ZSGWMABGC","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MPF2E54Z","created_at":"2026-05-18T12:27:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:MPF2E54ZSGWMABGCBCNYLXOE5D","target":"record","payload":{"canonical_record":{"source":{"id":"1310.4868","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-10-17T23:07:54Z","cross_cats_sorted":[],"title_canon_sha256":"85491990ea0b7a6c7f0bf42902d35140810a972c838e281ce8614b0404048a4b","abstract_canon_sha256":"846c344e47af952b9f80b98828608a428794a3ad292a8bb03455626bcbff1ea3"},"schema_version":"1.0"},"canonical_sha256":"63cba2779991acc004c2089b85ddc4e8c33b84cbf1b389a075fdabb351060203","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:16.976453Z","signature_b64":"O/CJYSanMRxDI1K9ZdLuDe5Oz2GDyHAnSrOvCY7gHB2qfDIEeci5WKI5oRUphsktNUYD71R4MgLzCZUFcxLnAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"63cba2779991acc004c2089b85ddc4e8c33b84cbf1b389a075fdabb351060203","last_reissued_at":"2026-05-18T01:23:16.975802Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:16.975802Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.4868","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":"2026-05-18T01:23:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BgnpMN2mir3msVh8Ca58rUKiZwL9v4w39aLyhyhFri5x9OkQHK9oBtfp+0vpE+gVxrGO1snHDKAMT1vwL097Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T14:09:10.778706Z"},"content_sha256":"53a8e9cf1ce807bce07c3d9098b92393183da531911ff8c4d9c236c6f61c36f9","schema_version":"1.0","event_id":"sha256:53a8e9cf1ce807bce07c3d9098b92393183da531911ff8c4d9c236c6f61c36f9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:MPF2E54ZSGWMABGCBCNYLXOE5D","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A pilot experience in physics laboratory for a professional school","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ed-ph","authors_text":"Maria De Nicola, Serena Frati, Simone Di Renzone, Vera Montalbano","submitted_at":"2013-10-17T23:07:54Z","abstract_excerpt":"The reform of the upper secondary school in Italy has recently introduced physics in the curricula of professional schools, in realities where it was previously absent. Many teachers, often with a temporary position, are obliged to teaching physics in schools where the absence of the laboratory is added to the lack of interest of students who feel this matter as very far from their personal interests and from the preparation for the work which could expect from a professional school. We report a leaning path for introducing students to the measurement of simple physical quantities, which conti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.4868","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":"2026-05-18T01:23:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8ndki4OHSpCVTbqS/1RZKWHL9ZyrJKhE4kyoNhkqdkTYjpY70RRq3TxN6SxLOhcgsDE93Scg7NRUV8lKqzf4Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T14:09:10.779048Z"},"content_sha256":"a63f9d9aac55038a0f420053899a8cb0f9ae76a028710988ab56c2e973786a8b","schema_version":"1.0","event_id":"sha256:a63f9d9aac55038a0f420053899a8cb0f9ae76a028710988ab56c2e973786a8b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MPF2E54ZSGWMABGCBCNYLXOE5D/bundle.json","state_url":"https://pith.science/pith/MPF2E54ZSGWMABGCBCNYLXOE5D/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MPF2E54ZSGWMABGCBCNYLXOE5D/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":"2026-06-25T14:09:10Z","links":{"resolver":"https://pith.science/pith/MPF2E54ZSGWMABGCBCNYLXOE5D","bundle":"https://pith.science/pith/MPF2E54ZSGWMABGCBCNYLXOE5D/bundle.json","state":"https://pith.science/pith/MPF2E54ZSGWMABGCBCNYLXOE5D/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MPF2E54ZSGWMABGCBCNYLXOE5D/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:MPF2E54ZSGWMABGCBCNYLXOE5D","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":"846c344e47af952b9f80b98828608a428794a3ad292a8bb03455626bcbff1ea3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-10-17T23:07:54Z","title_canon_sha256":"85491990ea0b7a6c7f0bf42902d35140810a972c838e281ce8614b0404048a4b"},"schema_version":"1.0","source":{"id":"1310.4868","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.4868","created_at":"2026-05-18T01:23:16Z"},{"alias_kind":"arxiv_version","alias_value":"1310.4868v2","created_at":"2026-05-18T01:23:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.4868","created_at":"2026-05-18T01:23:16Z"},{"alias_kind":"pith_short_12","alias_value":"MPF2E54ZSGWM","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MPF2E54ZSGWMABGC","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MPF2E54Z","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:a63f9d9aac55038a0f420053899a8cb0f9ae76a028710988ab56c2e973786a8b","target":"graph","created_at":"2026-05-18T01:23:16Z","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":"The reform of the upper secondary school in Italy has recently introduced physics in the curricula of professional schools, in realities where it was previously absent. Many teachers, often with a temporary position, are obliged to teaching physics in schools where the absence of the laboratory is added to the lack of interest of students who feel this matter as very far from their personal interests and from the preparation for the work which could expect from a professional school. We report a leaning path for introducing students to the measurement of simple physical quantities, which conti","authors_text":"Maria De Nicola, Serena Frati, Simone Di Renzone, Vera Montalbano","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-10-17T23:07:54Z","title":"A pilot experience in physics laboratory for a professional school"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.4868","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":"sha256:53a8e9cf1ce807bce07c3d9098b92393183da531911ff8c4d9c236c6f61c36f9","target":"record","created_at":"2026-05-18T01:23:16Z","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":"846c344e47af952b9f80b98828608a428794a3ad292a8bb03455626bcbff1ea3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2013-10-17T23:07:54Z","title_canon_sha256":"85491990ea0b7a6c7f0bf42902d35140810a972c838e281ce8614b0404048a4b"},"schema_version":"1.0","source":{"id":"1310.4868","kind":"arxiv","version":2}},"canonical_sha256":"63cba2779991acc004c2089b85ddc4e8c33b84cbf1b389a075fdabb351060203","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"63cba2779991acc004c2089b85ddc4e8c33b84cbf1b389a075fdabb351060203","first_computed_at":"2026-05-18T01:23:16.975802Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:23:16.975802Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"O/CJYSanMRxDI1K9ZdLuDe5Oz2GDyHAnSrOvCY7gHB2qfDIEeci5WKI5oRUphsktNUYD71R4MgLzCZUFcxLnAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:23:16.976453Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.4868","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:53a8e9cf1ce807bce07c3d9098b92393183da531911ff8c4d9c236c6f61c36f9","sha256:a63f9d9aac55038a0f420053899a8cb0f9ae76a028710988ab56c2e973786a8b"],"state_sha256":"599c77f5042c89a50c76ea06d07417d436c52b6a2283d6ab7f217503c4c62d8f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vJQwqOoHB+TOdbX1dBUvbwTmePYG+siwCajImPR+a1/P05fLgxYunoqj3bh0norup10WhsiZtbp5AOmaniO3Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-25T14:09:10.780995Z","bundle_sha256":"6efd1ec1bacfbfc5834b07032295f7d1cc450161f38b9920f59f334a795d63b0"}}