{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:SUSYQGF4HXTPVUBPJZFJDK7NPW","short_pith_number":"pith:SUSYQGF4","canonical_record":{"source":{"id":"2607.10828","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2026-07-12T16:42:15Z","cross_cats_sorted":[],"title_canon_sha256":"3e498eb946cd2ce036fbbe1a7f8a0969dc5c93b5995d9a3946b95530bff8a5a1","abstract_canon_sha256":"613e842954eb10f436c5e3c5fffa0b4c77ea51e5a6b3459b56e4228d85f2b5fc"},"schema_version":"1.0"},"canonical_sha256":"95258818bc3de6fad02f4e4a91abed7da3b2c1295e9cc4c7b2bb2c5f8fd6da96","source":{"kind":"arxiv","id":"2607.10828","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.10828","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"arxiv_version","alias_value":"2607.10828v1","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.10828","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"pith_short_12","alias_value":"SUSYQGF4HXTP","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"pith_short_16","alias_value":"SUSYQGF4HXTPVUBP","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"pith_short_8","alias_value":"SUSYQGF4","created_at":"2026-07-14T01:21:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:SUSYQGF4HXTPVUBPJZFJDK7NPW","target":"record","payload":{"canonical_record":{"source":{"id":"2607.10828","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2026-07-12T16:42:15Z","cross_cats_sorted":[],"title_canon_sha256":"3e498eb946cd2ce036fbbe1a7f8a0969dc5c93b5995d9a3946b95530bff8a5a1","abstract_canon_sha256":"613e842954eb10f436c5e3c5fffa0b4c77ea51e5a6b3459b56e4228d85f2b5fc"},"schema_version":"1.0"},"canonical_sha256":"95258818bc3de6fad02f4e4a91abed7da3b2c1295e9cc4c7b2bb2c5f8fd6da96","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-14T01:21:42.381174Z","signature_b64":"621jlTIZIE5+Rsv1/GmFhBWbgSALwfIjOCTG5DJgySK3tVOyrtD0QUqGMVcPVpYY+aFJuBYgPxlST15AX9zhBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"95258818bc3de6fad02f4e4a91abed7da3b2c1295e9cc4c7b2bb2c5f8fd6da96","last_reissued_at":"2026-07-14T01:21:42.380337Z","signature_status":"signed_v1","first_computed_at":"2026-07-14T01:21:42.380337Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.10828","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":"2026-07-14T01:21:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4PSZq7QuEABiJe0UxWz6ve32NxiQwmmWaEf0n3MuX0C2bwVj4VXqISqsDP45kK4q7Zm2qGAhpRz3hHJnE4IiAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T17:32:15.692159Z"},"content_sha256":"c48ec6265ab60a5135376fcc4e81145a6e07a924b8608dde274508cca4051b40","schema_version":"1.0","event_id":"sha256:c48ec6265ab60a5135376fcc4e81145a6e07a924b8608dde274508cca4051b40"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:SUSYQGF4HXTPVUBPJZFJDK7NPW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Small but Tubby: A Magnetic Loop Antenna Made from 100 mm Copper Tubing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"Markus Niese, Peter M\\\"arki","submitted_at":"2026-07-12T16:42:15Z","abstract_excerpt":"This paper presents the electrical model, key equations, and practical construction of a small transmitting magnetic loop antenna built from unusually large 100 mm diameter copper tubing. The large conductor surface area and wide-area transitions to the vacuum capacitors were designed to minimize resistive losses. The frequency range from 1.8 MHz to 31 MHz is unusually wide. Frequency, impedance matching, and azimuth are all adjusted automatically by servo motors. A novel feature is the routing of the control wiring inside the loop conductor, allowing the motor to be mounted without electrical"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.10828","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.10828/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-14T01:21:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"izxifa/JAj9Vx5FKMr4Bnq46KdcC7fM5wWdhm1ae1YBpPH1yB0jkhsvG84LIxT1pj/Wd5Y832qtekVTmnscICg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T17:32:15.692668Z"},"content_sha256":"0b6c089d22346e979c23e89a0fb6276261b7ed31cb19012cd46d3a3bce7a1e93","schema_version":"1.0","event_id":"sha256:0b6c089d22346e979c23e89a0fb6276261b7ed31cb19012cd46d3a3bce7a1e93"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SUSYQGF4HXTPVUBPJZFJDK7NPW/bundle.json","state_url":"https://pith.science/pith/SUSYQGF4HXTPVUBPJZFJDK7NPW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SUSYQGF4HXTPVUBPJZFJDK7NPW/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":"2026-08-22T17:32:15Z","links":{"resolver":"https://pith.science/pith/SUSYQGF4HXTPVUBPJZFJDK7NPW","bundle":"https://pith.science/pith/SUSYQGF4HXTPVUBPJZFJDK7NPW/bundle.json","state":"https://pith.science/pith/SUSYQGF4HXTPVUBPJZFJDK7NPW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SUSYQGF4HXTPVUBPJZFJDK7NPW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:SUSYQGF4HXTPVUBPJZFJDK7NPW","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":"613e842954eb10f436c5e3c5fffa0b4c77ea51e5a6b3459b56e4228d85f2b5fc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2026-07-12T16:42:15Z","title_canon_sha256":"3e498eb946cd2ce036fbbe1a7f8a0969dc5c93b5995d9a3946b95530bff8a5a1"},"schema_version":"1.0","source":{"id":"2607.10828","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.10828","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"arxiv_version","alias_value":"2607.10828v1","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.10828","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"pith_short_12","alias_value":"SUSYQGF4HXTP","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"pith_short_16","alias_value":"SUSYQGF4HXTPVUBP","created_at":"2026-07-14T01:21:42Z"},{"alias_kind":"pith_short_8","alias_value":"SUSYQGF4","created_at":"2026-07-14T01:21:42Z"}],"graph_snapshots":[{"event_id":"sha256:0b6c089d22346e979c23e89a0fb6276261b7ed31cb19012cd46d3a3bce7a1e93","target":"graph","created_at":"2026-07-14T01:21:42Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2607.10828/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This paper presents the electrical model, key equations, and practical construction of a small transmitting magnetic loop antenna built from unusually large 100 mm diameter copper tubing. The large conductor surface area and wide-area transitions to the vacuum capacitors were designed to minimize resistive losses. The frequency range from 1.8 MHz to 31 MHz is unusually wide. Frequency, impedance matching, and azimuth are all adjusted automatically by servo motors. A novel feature is the routing of the control wiring inside the loop conductor, allowing the motor to be mounted without electrical","authors_text":"Markus Niese, Peter M\\\"arki","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2026-07-12T16:42:15Z","title":"Small but Tubby: A Magnetic Loop Antenna Made from 100 mm Copper Tubing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.10828","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:c48ec6265ab60a5135376fcc4e81145a6e07a924b8608dde274508cca4051b40","target":"record","created_at":"2026-07-14T01:21:42Z","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":"613e842954eb10f436c5e3c5fffa0b4c77ea51e5a6b3459b56e4228d85f2b5fc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2026-07-12T16:42:15Z","title_canon_sha256":"3e498eb946cd2ce036fbbe1a7f8a0969dc5c93b5995d9a3946b95530bff8a5a1"},"schema_version":"1.0","source":{"id":"2607.10828","kind":"arxiv","version":1}},"canonical_sha256":"95258818bc3de6fad02f4e4a91abed7da3b2c1295e9cc4c7b2bb2c5f8fd6da96","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"95258818bc3de6fad02f4e4a91abed7da3b2c1295e9cc4c7b2bb2c5f8fd6da96","first_computed_at":"2026-07-14T01:21:42.380337Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-14T01:21:42.380337Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"621jlTIZIE5+Rsv1/GmFhBWbgSALwfIjOCTG5DJgySK3tVOyrtD0QUqGMVcPVpYY+aFJuBYgPxlST15AX9zhBA==","signature_status":"signed_v1","signed_at":"2026-07-14T01:21:42.381174Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.10828","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c48ec6265ab60a5135376fcc4e81145a6e07a924b8608dde274508cca4051b40","sha256:0b6c089d22346e979c23e89a0fb6276261b7ed31cb19012cd46d3a3bce7a1e93"],"state_sha256":"3f63ddc47eb54b9a79f74e9ce36532ea95093f9894dee8a4d99bba2dd86f971c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DzgeXpjmGbJ5HdnrF+qbuwmYH1li4KBoPEyh95jrHqehID2h2sOK4SjeKmSvqqM1+7pQGG6JyqgXTR/PpupuBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T17:32:15.697413Z","bundle_sha256":"ca695a4b9ed1b6de96bf7c0cbe5d1d2c8136a73339b11c882664a520a7f482c4"}}