{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2004:G7GC2AZBU2RU5LYPL2JAOPWJQ5","short_pith_number":"pith:G7GC2AZB","canonical_record":{"source":{"id":"gr-qc/0401016","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"gr-qc","submitted_at":"2004-01-06T18:58:08Z","cross_cats_sorted":["hep-th","physics.class-ph"],"title_canon_sha256":"d5ebadc0d653b7906e6cdf16c59e7b3ae2075b7cade54c3274511d6209f9c319","abstract_canon_sha256":"f7b45d0452cb20dbba6a40fd77106246597eccf857b9d334dd1583816422b0a2"},"schema_version":"1.0"},"canonical_sha256":"37cc2d0321a6a34eaf0f5e92073ec9875cb7481d56a1ecf3829e1e62384ea53f","source":{"kind":"arxiv","id":"gr-qc/0401016","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"gr-qc/0401016","created_at":"2026-05-18T01:39:22Z"},{"alias_kind":"arxiv_version","alias_value":"gr-qc/0401016v1","created_at":"2026-05-18T01:39:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.gr-qc/0401016","created_at":"2026-05-18T01:39:22Z"},{"alias_kind":"pith_short_12","alias_value":"G7GC2AZBU2RU","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"G7GC2AZBU2RU5LYP","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"G7GC2AZB","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2004:G7GC2AZBU2RU5LYPL2JAOPWJQ5","target":"record","payload":{"canonical_record":{"source":{"id":"gr-qc/0401016","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"gr-qc","submitted_at":"2004-01-06T18:58:08Z","cross_cats_sorted":["hep-th","physics.class-ph"],"title_canon_sha256":"d5ebadc0d653b7906e6cdf16c59e7b3ae2075b7cade54c3274511d6209f9c319","abstract_canon_sha256":"f7b45d0452cb20dbba6a40fd77106246597eccf857b9d334dd1583816422b0a2"},"schema_version":"1.0"},"canonical_sha256":"37cc2d0321a6a34eaf0f5e92073ec9875cb7481d56a1ecf3829e1e62384ea53f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:39:22.701981Z","signature_b64":"nADRXZAxCwMxuiLZcXJaH6nlpxg0pHkdGDSy77Y//9cg5DiU4Wja04F49zAc89qrR7MZe3CiFZdv9kSDFhduCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"37cc2d0321a6a34eaf0f5e92073ec9875cb7481d56a1ecf3829e1e62384ea53f","last_reissued_at":"2026-05-18T01:39:22.701262Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:39:22.701262Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"gr-qc/0401016","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":"2026-05-18T01:39:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aNfvulyMI4QiHVXBz+2tmySfLHZE4G9ixjiIW7DZY67Ilk7UhoWnq+FMuPJXV04IlfVJMgIXAs1mlznMnuUrCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T15:00:35.384817Z"},"content_sha256":"46ca383853c905986ee4cb364899f125581783465db742f646b4c32ee04f94a5","schema_version":"1.0","event_id":"sha256:46ca383853c905986ee4cb364899f125581783465db742f646b4c32ee04f94a5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2004:G7GC2AZBU2RU5LYPL2JAOPWJQ5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Is the Lorentz signature of the metric of spacetime electromagnetic in origin?","license":"","headline":"","cross_cats":["hep-th","physics.class-ph"],"primary_cat":"gr-qc","authors_text":"Friedrich W. Hehl, Yakov Itin","submitted_at":"2004-01-06T18:58:08Z","abstract_excerpt":"We formulate a premetric version of classical electrodynamics in terms of the excitation H and the field strength F. A local, linear, and symmetric spacetime relation between H and F is assumed. It yields, if electric/magnetic reciprocity is postulated, a Lorentzian metric of spacetime thereby excluding Euclidean signature (which is, nevertheless, discussed in some detail). Moreover, we determine the Dufay law (repulsion of like charges and attraction of opposite ones), the Lenz rule (the relative sign in Faraday's law), and the sign of the electromagnetic energy. In this way, we get a systema"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"gr-qc/0401016","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":"2026-05-18T01:39:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oLxT0xQvJARx0lhO5A8YAcMo/e35tgUh8LHQ5w/f0dEj3zwYmDDRvt1YTSLPNs81kZBft+T5syB2uVBcR7PyCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T15:00:35.385161Z"},"content_sha256":"c79eb20eb7bcc6eb76cbf13ce1a3d44b5fa2b4e55375c74e71d74412cb6ba836","schema_version":"1.0","event_id":"sha256:c79eb20eb7bcc6eb76cbf13ce1a3d44b5fa2b4e55375c74e71d74412cb6ba836"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G7GC2AZBU2RU5LYPL2JAOPWJQ5/bundle.json","state_url":"https://pith.science/pith/G7GC2AZBU2RU5LYPL2JAOPWJQ5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G7GC2AZBU2RU5LYPL2JAOPWJQ5/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":"2026-06-08T15:00:35Z","links":{"resolver":"https://pith.science/pith/G7GC2AZBU2RU5LYPL2JAOPWJQ5","bundle":"https://pith.science/pith/G7GC2AZBU2RU5LYPL2JAOPWJQ5/bundle.json","state":"https://pith.science/pith/G7GC2AZBU2RU5LYPL2JAOPWJQ5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G7GC2AZBU2RU5LYPL2JAOPWJQ5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:G7GC2AZBU2RU5LYPL2JAOPWJQ5","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":"f7b45d0452cb20dbba6a40fd77106246597eccf857b9d334dd1583816422b0a2","cross_cats_sorted":["hep-th","physics.class-ph"],"license":"","primary_cat":"gr-qc","submitted_at":"2004-01-06T18:58:08Z","title_canon_sha256":"d5ebadc0d653b7906e6cdf16c59e7b3ae2075b7cade54c3274511d6209f9c319"},"schema_version":"1.0","source":{"id":"gr-qc/0401016","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"gr-qc/0401016","created_at":"2026-05-18T01:39:22Z"},{"alias_kind":"arxiv_version","alias_value":"gr-qc/0401016v1","created_at":"2026-05-18T01:39:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.gr-qc/0401016","created_at":"2026-05-18T01:39:22Z"},{"alias_kind":"pith_short_12","alias_value":"G7GC2AZBU2RU","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"G7GC2AZBU2RU5LYP","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"G7GC2AZB","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:c79eb20eb7bcc6eb76cbf13ce1a3d44b5fa2b4e55375c74e71d74412cb6ba836","target":"graph","created_at":"2026-05-18T01:39:22Z","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 formulate a premetric version of classical electrodynamics in terms of the excitation H and the field strength F. A local, linear, and symmetric spacetime relation between H and F is assumed. It yields, if electric/magnetic reciprocity is postulated, a Lorentzian metric of spacetime thereby excluding Euclidean signature (which is, nevertheless, discussed in some detail). Moreover, we determine the Dufay law (repulsion of like charges and attraction of opposite ones), the Lenz rule (the relative sign in Faraday's law), and the sign of the electromagnetic energy. In this way, we get a systema","authors_text":"Friedrich W. Hehl, Yakov Itin","cross_cats":["hep-th","physics.class-ph"],"headline":"","license":"","primary_cat":"gr-qc","submitted_at":"2004-01-06T18:58:08Z","title":"Is the Lorentz signature of the metric of spacetime electromagnetic in origin?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"gr-qc/0401016","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":"sha256:46ca383853c905986ee4cb364899f125581783465db742f646b4c32ee04f94a5","target":"record","created_at":"2026-05-18T01:39:22Z","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":"f7b45d0452cb20dbba6a40fd77106246597eccf857b9d334dd1583816422b0a2","cross_cats_sorted":["hep-th","physics.class-ph"],"license":"","primary_cat":"gr-qc","submitted_at":"2004-01-06T18:58:08Z","title_canon_sha256":"d5ebadc0d653b7906e6cdf16c59e7b3ae2075b7cade54c3274511d6209f9c319"},"schema_version":"1.0","source":{"id":"gr-qc/0401016","kind":"arxiv","version":1}},"canonical_sha256":"37cc2d0321a6a34eaf0f5e92073ec9875cb7481d56a1ecf3829e1e62384ea53f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"37cc2d0321a6a34eaf0f5e92073ec9875cb7481d56a1ecf3829e1e62384ea53f","first_computed_at":"2026-05-18T01:39:22.701262Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:39:22.701262Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nADRXZAxCwMxuiLZcXJaH6nlpxg0pHkdGDSy77Y//9cg5DiU4Wja04F49zAc89qrR7MZe3CiFZdv9kSDFhduCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:39:22.701981Z","signed_message":"canonical_sha256_bytes"},"source_id":"gr-qc/0401016","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:46ca383853c905986ee4cb364899f125581783465db742f646b4c32ee04f94a5","sha256:c79eb20eb7bcc6eb76cbf13ce1a3d44b5fa2b4e55375c74e71d74412cb6ba836"],"state_sha256":"50714c940c6c575ebc46a30cb744ea78b259d0b82bf1eea338daf8f83a29ad66"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VjearWa7nQjXJyXNyGI1NQ0wlWxp0adGBgJu3bbqibW+QD59wL/HPbsL5cAsFd3zca3w4gkUryTgnaFGrBuvCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T15:00:35.387050Z","bundle_sha256":"cf962bd36d065f2d23f7079417c2aed658516541398e0ff0d4c3736a9d9059cc"}}