{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:7VB5BZ7WETFIK7TSZQGFMAIZAU","short_pith_number":"pith:7VB5BZ7W","canonical_record":{"source":{"id":"2512.12312","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2025-12-13T12:52:59Z","cross_cats_sorted":["physics.app-ph","physics.class-ph"],"title_canon_sha256":"f7859ca4b8adff614ca4a57835709c392c362e1c577457d9e2c6bb6013aa7343","abstract_canon_sha256":"26ef46170379c2e2ee2393f215378aec5b683d5ebb67984a29df245fc8e4ce53"},"schema_version":"1.0"},"canonical_sha256":"fd43d0e7f624ca857e72cc0c560119051423f06db49dd79c9911ae0f92aff364","source":{"kind":"arxiv","id":"2512.12312","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.12312","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"arxiv_version","alias_value":"2512.12312v1","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.12312","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"pith_short_12","alias_value":"7VB5BZ7WETFI","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"pith_short_16","alias_value":"7VB5BZ7WETFIK7TS","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"pith_short_8","alias_value":"7VB5BZ7W","created_at":"2026-06-03T00:05:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:7VB5BZ7WETFIK7TSZQGFMAIZAU","target":"record","payload":{"canonical_record":{"source":{"id":"2512.12312","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2025-12-13T12:52:59Z","cross_cats_sorted":["physics.app-ph","physics.class-ph"],"title_canon_sha256":"f7859ca4b8adff614ca4a57835709c392c362e1c577457d9e2c6bb6013aa7343","abstract_canon_sha256":"26ef46170379c2e2ee2393f215378aec5b683d5ebb67984a29df245fc8e4ce53"},"schema_version":"1.0"},"canonical_sha256":"fd43d0e7f624ca857e72cc0c560119051423f06db49dd79c9911ae0f92aff364","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-03T00:05:03.452626Z","signature_b64":"xR0NVmZ06OpiW7THAM4PbGbnSAEhIENiN9jfL/oWd/Lq/6bIfgVbGyrWrDZksrNQTAImcsWGOSQmrTqzxtPJDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fd43d0e7f624ca857e72cc0c560119051423f06db49dd79c9911ae0f92aff364","last_reissued_at":"2026-06-03T00:05:03.452050Z","signature_status":"signed_v1","first_computed_at":"2026-06-03T00:05:03.452050Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2512.12312","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":"2026-06-03T00:05:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FBSqhzdiJk1CI9zHUpQONVcETokmlrtwCB1OLMXBWrMIxrIFA0C9AQhnA/Mur5TNSEfxdkUkYPmGnpOdXMtHBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T01:52:27.670979Z"},"content_sha256":"4e32473f8abf513f8c35cdfa1c2706ac8cd032e7178fc207be7b4876aca3a07e","schema_version":"1.0","event_id":"sha256:4e32473f8abf513f8c35cdfa1c2706ac8cd032e7178fc207be7b4876aca3a07e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:7VB5BZ7WETFIK7TSZQGFMAIZAU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Exploring Fourier methods with beer bottles","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.app-ph","physics.class-ph"],"primary_cat":"physics.ed-ph","authors_text":"David Kordahl, Emma Foster","submitted_at":"2025-12-13T12:52:59Z","abstract_excerpt":"As anyone who has blown across the mouth of a beer bottle knows, beer bottles have a well-defined fundamental frequency. This paper shows how a beer bottle's acoustical resonance can be modeled as a one-dimensional driven-damped oscillator and includes enough detail to be useful in undergraduate laboratory experiments. While the frequency-domain Green's function of the bottle can be extracted through sequential pure-tone measurements, sufficient data to fit the model's parameters can be collected in just a few seconds when Fourier methods are used."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.12312","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/2512.12312/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":"2026-06-03T00:05:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c5B6hfC5E7ZyR07SPLe2zYOHpRcfyotnrpwf/ZKiDYOExXxSCO8rNQRodm7ESvjyEHMLOgiUSO/BP61IOWSoCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T01:52:27.671585Z"},"content_sha256":"086dd98076abf4ace021835c21b9046d0befbcac514b140f29db154d85633e58","schema_version":"1.0","event_id":"sha256:086dd98076abf4ace021835c21b9046d0befbcac514b140f29db154d85633e58"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7VB5BZ7WETFIK7TSZQGFMAIZAU/bundle.json","state_url":"https://pith.science/pith/7VB5BZ7WETFIK7TSZQGFMAIZAU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7VB5BZ7WETFIK7TSZQGFMAIZAU/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":"2026-08-23T01:52:27Z","links":{"resolver":"https://pith.science/pith/7VB5BZ7WETFIK7TSZQGFMAIZAU","bundle":"https://pith.science/pith/7VB5BZ7WETFIK7TSZQGFMAIZAU/bundle.json","state":"https://pith.science/pith/7VB5BZ7WETFIK7TSZQGFMAIZAU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7VB5BZ7WETFIK7TSZQGFMAIZAU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:7VB5BZ7WETFIK7TSZQGFMAIZAU","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":"26ef46170379c2e2ee2393f215378aec5b683d5ebb67984a29df245fc8e4ce53","cross_cats_sorted":["physics.app-ph","physics.class-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2025-12-13T12:52:59Z","title_canon_sha256":"f7859ca4b8adff614ca4a57835709c392c362e1c577457d9e2c6bb6013aa7343"},"schema_version":"1.0","source":{"id":"2512.12312","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.12312","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"arxiv_version","alias_value":"2512.12312v1","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.12312","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"pith_short_12","alias_value":"7VB5BZ7WETFI","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"pith_short_16","alias_value":"7VB5BZ7WETFIK7TS","created_at":"2026-06-03T00:05:03Z"},{"alias_kind":"pith_short_8","alias_value":"7VB5BZ7W","created_at":"2026-06-03T00:05:03Z"}],"graph_snapshots":[{"event_id":"sha256:086dd98076abf4ace021835c21b9046d0befbcac514b140f29db154d85633e58","target":"graph","created_at":"2026-06-03T00:05:03Z","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/2512.12312/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"As anyone who has blown across the mouth of a beer bottle knows, beer bottles have a well-defined fundamental frequency. This paper shows how a beer bottle's acoustical resonance can be modeled as a one-dimensional driven-damped oscillator and includes enough detail to be useful in undergraduate laboratory experiments. While the frequency-domain Green's function of the bottle can be extracted through sequential pure-tone measurements, sufficient data to fit the model's parameters can be collected in just a few seconds when Fourier methods are used.","authors_text":"David Kordahl, Emma Foster","cross_cats":["physics.app-ph","physics.class-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2025-12-13T12:52:59Z","title":"Exploring Fourier methods with beer bottles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.12312","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":"sha256:4e32473f8abf513f8c35cdfa1c2706ac8cd032e7178fc207be7b4876aca3a07e","target":"record","created_at":"2026-06-03T00:05:03Z","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":"26ef46170379c2e2ee2393f215378aec5b683d5ebb67984a29df245fc8e4ce53","cross_cats_sorted":["physics.app-ph","physics.class-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2025-12-13T12:52:59Z","title_canon_sha256":"f7859ca4b8adff614ca4a57835709c392c362e1c577457d9e2c6bb6013aa7343"},"schema_version":"1.0","source":{"id":"2512.12312","kind":"arxiv","version":1}},"canonical_sha256":"fd43d0e7f624ca857e72cc0c560119051423f06db49dd79c9911ae0f92aff364","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fd43d0e7f624ca857e72cc0c560119051423f06db49dd79c9911ae0f92aff364","first_computed_at":"2026-06-03T00:05:03.452050Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-03T00:05:03.452050Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xR0NVmZ06OpiW7THAM4PbGbnSAEhIENiN9jfL/oWd/Lq/6bIfgVbGyrWrDZksrNQTAImcsWGOSQmrTqzxtPJDA==","signature_status":"signed_v1","signed_at":"2026-06-03T00:05:03.452626Z","signed_message":"canonical_sha256_bytes"},"source_id":"2512.12312","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4e32473f8abf513f8c35cdfa1c2706ac8cd032e7178fc207be7b4876aca3a07e","sha256:086dd98076abf4ace021835c21b9046d0befbcac514b140f29db154d85633e58"],"state_sha256":"16f01e5fcd81039df23533faa4461a9933abbecb7516076ffbcd80a00742cdcd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mSmO13pgn5IYFxAfq1/LiSYKOjduASdvPZXm7BkQCl6I10rMcWAl6+4B8BYrLrAR/zKqyGFw5fffxlyHuFgtAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T01:52:27.676808Z","bundle_sha256":"81afd508a8fa39f63c6f016aaf141eef5fb857b4ab992eafa4f5fe47edcc4e67"}}