{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:SLIPGQ44RQVCFLHEABFTUJC7L7","short_pith_number":"pith:SLIPGQ44","canonical_record":{"source":{"id":"1805.04014","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2018-05-10T15:02:23Z","cross_cats_sorted":["physics.flu-dyn","physics.pop-ph"],"title_canon_sha256":"5af44fd8dc4530cf76759914c63181fa85a318e59b043acaa9e11fdaea68c4c9","abstract_canon_sha256":"0c45e25bb491d8ef383958843b384b5ee2b756eb3f3c1db8e034a605cabaa771"},"schema_version":"1.0"},"canonical_sha256":"92d0f3439c8c2a22ace4004b3a245f5fde24ac005505aa343ef90f42bd1e9704","source":{"kind":"arxiv","id":"1805.04014","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.04014","created_at":"2026-05-17T23:59:17Z"},{"alias_kind":"arxiv_version","alias_value":"1805.04014v1","created_at":"2026-05-17T23:59:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.04014","created_at":"2026-05-17T23:59:17Z"},{"alias_kind":"pith_short_12","alias_value":"SLIPGQ44RQVC","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"SLIPGQ44RQVCFLHE","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"SLIPGQ44","created_at":"2026-05-18T12:32:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:SLIPGQ44RQVCFLHEABFTUJC7L7","target":"record","payload":{"canonical_record":{"source":{"id":"1805.04014","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2018-05-10T15:02:23Z","cross_cats_sorted":["physics.flu-dyn","physics.pop-ph"],"title_canon_sha256":"5af44fd8dc4530cf76759914c63181fa85a318e59b043acaa9e11fdaea68c4c9","abstract_canon_sha256":"0c45e25bb491d8ef383958843b384b5ee2b756eb3f3c1db8e034a605cabaa771"},"schema_version":"1.0"},"canonical_sha256":"92d0f3439c8c2a22ace4004b3a245f5fde24ac005505aa343ef90f42bd1e9704","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:17.158583Z","signature_b64":"pnn23j2TXRPSiAw+rVIe3qa6uE/ndzn0Z9RWhx2fPLG3GpRKwqEjycxAIXLPrlAnvf7eYZv93nZj5GWnFBJ1Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"92d0f3439c8c2a22ace4004b3a245f5fde24ac005505aa343ef90f42bd1e9704","last_reissued_at":"2026-05-17T23:59:17.157986Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:17.157986Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.04014","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":"2026-05-17T23:59:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cJTS2cJZSgJku5ErAY3M6aUOp7f/Veaxx9EU5yH1Vi+xuVxzhNcXOR6VIuuMpKoYUI4NiqEgmL4Ty7pcONP/Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:35:49.856039Z"},"content_sha256":"6812ad837be91991a3e9233b1ad8e55d64ed6a234096829d7d44c8d06a9161e1","schema_version":"1.0","event_id":"sha256:6812ad837be91991a3e9233b1ad8e55d64ed6a234096829d7d44c8d06a9161e1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:SLIPGQ44RQVCFLHEABFTUJC7L7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A bottle of tea as a universal Helmholtz resonator","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.flu-dyn","physics.pop-ph"],"primary_cat":"physics.ed-ph","authors_text":"Arturo C. Marti, Cecilia Cabeza, Cecilia Stari, Mart\\'in Monteiro","submitted_at":"2018-05-10T15:02:23Z","abstract_excerpt":"Resonance is an ubiquitous phenomenon present in many systems. In particular, air resonance in cavities was studied by Hermann von Helmholtz in the 1850s. Originally used as acoustic filters, Helmholtz resonators are rigid-wall cavities which reverberate at given fixed frequencies. An adjustable type of resonator is the so-called universal Helmholtz resonator, a device consisting of two sliding cylinders capable of producing sounds over a continuous range of frequencies. Here we propose a simple experiment using a smartphone and normal bottle of tea, with a nearly uniform cylindrical section, "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.04014","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":"2026-05-17T23:59:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+pGTY9NfDNmTQndO/d9voYvIOFVPMmAAbgfBcCbQuIpgYUdujRgoiDczge7bV2kmUUyWVGzBOl03urQTzMFMBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:35:49.856403Z"},"content_sha256":"6298bfa113cd5eed71f46589d94a22b1d5514b34e5a8927105206839319766ed","schema_version":"1.0","event_id":"sha256:6298bfa113cd5eed71f46589d94a22b1d5514b34e5a8927105206839319766ed"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SLIPGQ44RQVCFLHEABFTUJC7L7/bundle.json","state_url":"https://pith.science/pith/SLIPGQ44RQVCFLHEABFTUJC7L7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SLIPGQ44RQVCFLHEABFTUJC7L7/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":"2026-06-02T04:35:49Z","links":{"resolver":"https://pith.science/pith/SLIPGQ44RQVCFLHEABFTUJC7L7","bundle":"https://pith.science/pith/SLIPGQ44RQVCFLHEABFTUJC7L7/bundle.json","state":"https://pith.science/pith/SLIPGQ44RQVCFLHEABFTUJC7L7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SLIPGQ44RQVCFLHEABFTUJC7L7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:SLIPGQ44RQVCFLHEABFTUJC7L7","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":"0c45e25bb491d8ef383958843b384b5ee2b756eb3f3c1db8e034a605cabaa771","cross_cats_sorted":["physics.flu-dyn","physics.pop-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2018-05-10T15:02:23Z","title_canon_sha256":"5af44fd8dc4530cf76759914c63181fa85a318e59b043acaa9e11fdaea68c4c9"},"schema_version":"1.0","source":{"id":"1805.04014","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.04014","created_at":"2026-05-17T23:59:17Z"},{"alias_kind":"arxiv_version","alias_value":"1805.04014v1","created_at":"2026-05-17T23:59:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.04014","created_at":"2026-05-17T23:59:17Z"},{"alias_kind":"pith_short_12","alias_value":"SLIPGQ44RQVC","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"SLIPGQ44RQVCFLHE","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"SLIPGQ44","created_at":"2026-05-18T12:32:53Z"}],"graph_snapshots":[{"event_id":"sha256:6298bfa113cd5eed71f46589d94a22b1d5514b34e5a8927105206839319766ed","target":"graph","created_at":"2026-05-17T23:59:17Z","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":"Resonance is an ubiquitous phenomenon present in many systems. In particular, air resonance in cavities was studied by Hermann von Helmholtz in the 1850s. Originally used as acoustic filters, Helmholtz resonators are rigid-wall cavities which reverberate at given fixed frequencies. An adjustable type of resonator is the so-called universal Helmholtz resonator, a device consisting of two sliding cylinders capable of producing sounds over a continuous range of frequencies. Here we propose a simple experiment using a smartphone and normal bottle of tea, with a nearly uniform cylindrical section, ","authors_text":"Arturo C. Marti, Cecilia Cabeza, Cecilia Stari, Mart\\'in Monteiro","cross_cats":["physics.flu-dyn","physics.pop-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2018-05-10T15:02:23Z","title":"A bottle of tea as a universal Helmholtz resonator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.04014","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":"sha256:6812ad837be91991a3e9233b1ad8e55d64ed6a234096829d7d44c8d06a9161e1","target":"record","created_at":"2026-05-17T23:59:17Z","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":"0c45e25bb491d8ef383958843b384b5ee2b756eb3f3c1db8e034a605cabaa771","cross_cats_sorted":["physics.flu-dyn","physics.pop-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2018-05-10T15:02:23Z","title_canon_sha256":"5af44fd8dc4530cf76759914c63181fa85a318e59b043acaa9e11fdaea68c4c9"},"schema_version":"1.0","source":{"id":"1805.04014","kind":"arxiv","version":1}},"canonical_sha256":"92d0f3439c8c2a22ace4004b3a245f5fde24ac005505aa343ef90f42bd1e9704","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"92d0f3439c8c2a22ace4004b3a245f5fde24ac005505aa343ef90f42bd1e9704","first_computed_at":"2026-05-17T23:59:17.157986Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:17.157986Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pnn23j2TXRPSiAw+rVIe3qa6uE/ndzn0Z9RWhx2fPLG3GpRKwqEjycxAIXLPrlAnvf7eYZv93nZj5GWnFBJ1Bw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:17.158583Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.04014","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6812ad837be91991a3e9233b1ad8e55d64ed6a234096829d7d44c8d06a9161e1","sha256:6298bfa113cd5eed71f46589d94a22b1d5514b34e5a8927105206839319766ed"],"state_sha256":"982a3a57e770191d471e6b285bd338b6393d2801f5f8912202f0bb619e7b0c28"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EqEbSPxBSqLALTTBQfGTJjdahd4Xej1FrAbO/BPtHoGupPsss4F49hQ1XW8U2DKe5uXU98+R1STLCc5VMe1BBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T04:35:49.858360Z","bundle_sha256":"6a3537c7a34b3c9c55826757604b5f4e0914047132c342a6a2d750cfd8b5a4f6"}}