{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:B6YEJG3HTR2FOPWKLWZXNHQYWZ","short_pith_number":"pith:B6YEJG3H","canonical_record":{"source":{"id":"1502.06112","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-02-21T16:06:05Z","cross_cats_sorted":["physics.med-ph"],"title_canon_sha256":"b7bc3c2dfdc3dfa17a3f4d2f884627f4b378c78e9193f95672349d3f1b76bbc0","abstract_canon_sha256":"580f11d65355f38d354b3f74e77c76bdf5886f33ede7e1a03c99c283b5671289"},"schema_version":"1.0"},"canonical_sha256":"0fb0449b679c74573eca5db3769e18b64c47059351a7d58dfd2b11413ad034e5","source":{"kind":"arxiv","id":"1502.06112","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.06112","created_at":"2026-05-18T02:26:38Z"},{"alias_kind":"arxiv_version","alias_value":"1502.06112v1","created_at":"2026-05-18T02:26:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.06112","created_at":"2026-05-18T02:26:38Z"},{"alias_kind":"pith_short_12","alias_value":"B6YEJG3HTR2F","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"B6YEJG3HTR2FOPWK","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"B6YEJG3H","created_at":"2026-05-18T12:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:B6YEJG3HTR2FOPWKLWZXNHQYWZ","target":"record","payload":{"canonical_record":{"source":{"id":"1502.06112","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-02-21T16:06:05Z","cross_cats_sorted":["physics.med-ph"],"title_canon_sha256":"b7bc3c2dfdc3dfa17a3f4d2f884627f4b378c78e9193f95672349d3f1b76bbc0","abstract_canon_sha256":"580f11d65355f38d354b3f74e77c76bdf5886f33ede7e1a03c99c283b5671289"},"schema_version":"1.0"},"canonical_sha256":"0fb0449b679c74573eca5db3769e18b64c47059351a7d58dfd2b11413ad034e5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:26:38.032087Z","signature_b64":"GEAW64yDe1aPXJ0uTeM7Vu34Kr5SdvdIrmHp0tINKoYVG8kBfuLulOysQ0TreLl1k2PJfhubmNZeuYoO6yFqCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0fb0449b679c74573eca5db3769e18b64c47059351a7d58dfd2b11413ad034e5","last_reissued_at":"2026-05-18T02:26:38.031619Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:26:38.031619Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.06112","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":"2026-05-18T02:26:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1C44fzziqrgdeMaig8k2LdT0WbBq7Dvj12PLhcIK+gzQKD0NupN6H2lT03Wlu52C0TdPXpONbw5S3Yfrvy9KDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T09:57:12.476448Z"},"content_sha256":"dcfa4952a6c1575dcc9e527ca50b9b77ab9648d7f43a29eccfcea948ec163733","schema_version":"1.0","event_id":"sha256:dcfa4952a6c1575dcc9e527ca50b9b77ab9648d7f43a29eccfcea948ec163733"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:B6YEJG3HTR2FOPWKLWZXNHQYWZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A $55 Shock Tube for Simulated Blast Waves","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.med-ph"],"primary_cat":"physics.ins-det","authors_text":"Amy Courtney, Elijah Courtney, Michael Courtney","submitted_at":"2015-02-21T16:06:05Z","abstract_excerpt":"Shock tubes are commonly employed to test candidate armor materials, validate numerical models, and conduct simulated blast experiments in animal models. As DoD interests desire to field wearable sensors as blast dosimeters, shock tubes may also serve for calibration and testing of these devices. The high blast pressures needed for experimental testing of candidate armors are unnecessary to test these sensors. An inexpensive, efficient, and easily available way of testing these pressure sensors is desirable. It is known that releasing compressed gas suddenly can create a repeatable shock front"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.06112","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":"2026-05-18T02:26:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qdqB3zYZr8b/ofkNh44AsLvG0EpfP8Jdzr8LgfUlPTLtuyIrbS1AuONzg9lzFUfAHJUxeuDKxCgBPL6gmJ/YDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T09:57:12.476800Z"},"content_sha256":"15606c989b06468c8b787cb6c247722292ee42c282fefd5f3e9eb69f186ed245","schema_version":"1.0","event_id":"sha256:15606c989b06468c8b787cb6c247722292ee42c282fefd5f3e9eb69f186ed245"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/B6YEJG3HTR2FOPWKLWZXNHQYWZ/bundle.json","state_url":"https://pith.science/pith/B6YEJG3HTR2FOPWKLWZXNHQYWZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/B6YEJG3HTR2FOPWKLWZXNHQYWZ/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":"2026-06-25T09:57:12Z","links":{"resolver":"https://pith.science/pith/B6YEJG3HTR2FOPWKLWZXNHQYWZ","bundle":"https://pith.science/pith/B6YEJG3HTR2FOPWKLWZXNHQYWZ/bundle.json","state":"https://pith.science/pith/B6YEJG3HTR2FOPWKLWZXNHQYWZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/B6YEJG3HTR2FOPWKLWZXNHQYWZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:B6YEJG3HTR2FOPWKLWZXNHQYWZ","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":"580f11d65355f38d354b3f74e77c76bdf5886f33ede7e1a03c99c283b5671289","cross_cats_sorted":["physics.med-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-02-21T16:06:05Z","title_canon_sha256":"b7bc3c2dfdc3dfa17a3f4d2f884627f4b378c78e9193f95672349d3f1b76bbc0"},"schema_version":"1.0","source":{"id":"1502.06112","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.06112","created_at":"2026-05-18T02:26:38Z"},{"alias_kind":"arxiv_version","alias_value":"1502.06112v1","created_at":"2026-05-18T02:26:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.06112","created_at":"2026-05-18T02:26:38Z"},{"alias_kind":"pith_short_12","alias_value":"B6YEJG3HTR2F","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"B6YEJG3HTR2FOPWK","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"B6YEJG3H","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:15606c989b06468c8b787cb6c247722292ee42c282fefd5f3e9eb69f186ed245","target":"graph","created_at":"2026-05-18T02:26:38Z","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":"Shock tubes are commonly employed to test candidate armor materials, validate numerical models, and conduct simulated blast experiments in animal models. As DoD interests desire to field wearable sensors as blast dosimeters, shock tubes may also serve for calibration and testing of these devices. The high blast pressures needed for experimental testing of candidate armors are unnecessary to test these sensors. An inexpensive, efficient, and easily available way of testing these pressure sensors is desirable. It is known that releasing compressed gas suddenly can create a repeatable shock front","authors_text":"Amy Courtney, Elijah Courtney, Michael Courtney","cross_cats":["physics.med-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-02-21T16:06:05Z","title":"A $55 Shock Tube for Simulated Blast Waves"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.06112","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:dcfa4952a6c1575dcc9e527ca50b9b77ab9648d7f43a29eccfcea948ec163733","target":"record","created_at":"2026-05-18T02:26:38Z","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":"580f11d65355f38d354b3f74e77c76bdf5886f33ede7e1a03c99c283b5671289","cross_cats_sorted":["physics.med-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-02-21T16:06:05Z","title_canon_sha256":"b7bc3c2dfdc3dfa17a3f4d2f884627f4b378c78e9193f95672349d3f1b76bbc0"},"schema_version":"1.0","source":{"id":"1502.06112","kind":"arxiv","version":1}},"canonical_sha256":"0fb0449b679c74573eca5db3769e18b64c47059351a7d58dfd2b11413ad034e5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0fb0449b679c74573eca5db3769e18b64c47059351a7d58dfd2b11413ad034e5","first_computed_at":"2026-05-18T02:26:38.031619Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:26:38.031619Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GEAW64yDe1aPXJ0uTeM7Vu34Kr5SdvdIrmHp0tINKoYVG8kBfuLulOysQ0TreLl1k2PJfhubmNZeuYoO6yFqCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:26:38.032087Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.06112","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dcfa4952a6c1575dcc9e527ca50b9b77ab9648d7f43a29eccfcea948ec163733","sha256:15606c989b06468c8b787cb6c247722292ee42c282fefd5f3e9eb69f186ed245"],"state_sha256":"72e5504c39dedecdedb3202bb87cc561a8d61db1d045efda0e055c864f97e9ad"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JSaybfQrglk7fv9YXJSVwFJx/rMieA/PnisK0KOj5CgknEtLxLlczNsAUeE5N7+j2jGaD641YkWIG/LvixwxAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-25T09:57:12.478775Z","bundle_sha256":"7fd0945041ac4ccb51134462bce78c718a4e9975442375454ef45d764d8f8ea0"}}