{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:ETNNC422LH75FTRKIBC35UBVUE","short_pith_number":"pith:ETNNC422","canonical_record":{"source":{"id":"1808.05882","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-17T14:34:59Z","cross_cats_sorted":[],"title_canon_sha256":"8ec5867e84e6c0e5bad4c12c6f3ffd64c9797f93cdb42e957a3e935281b4e642","abstract_canon_sha256":"0d32969a1a60806cc47b55629ab8e7ddcb97ef74d92152d25e23250e3e66f751"},"schema_version":"1.0"},"canonical_sha256":"24dad1735a59ffd2ce2a4045bed035a133a121fcaa1df9a75d58fa563472692a","source":{"kind":"arxiv","id":"1808.05882","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.05882","created_at":"2026-05-18T00:03:03Z"},{"alias_kind":"arxiv_version","alias_value":"1808.05882v1","created_at":"2026-05-18T00:03:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.05882","created_at":"2026-05-18T00:03:03Z"},{"alias_kind":"pith_short_12","alias_value":"ETNNC422LH75","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"ETNNC422LH75FTRK","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"ETNNC422","created_at":"2026-05-18T12:32:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:ETNNC422LH75FTRKIBC35UBVUE","target":"record","payload":{"canonical_record":{"source":{"id":"1808.05882","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-17T14:34:59Z","cross_cats_sorted":[],"title_canon_sha256":"8ec5867e84e6c0e5bad4c12c6f3ffd64c9797f93cdb42e957a3e935281b4e642","abstract_canon_sha256":"0d32969a1a60806cc47b55629ab8e7ddcb97ef74d92152d25e23250e3e66f751"},"schema_version":"1.0"},"canonical_sha256":"24dad1735a59ffd2ce2a4045bed035a133a121fcaa1df9a75d58fa563472692a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:03:03.881420Z","signature_b64":"2BuCLIZD++1de8QxsrnVeVP5HbFyNzAXIL2lDlO49fmJdjYCinwB/tq2Fpr7c5iX38e5mW2QSyLmD75kQhaaCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"24dad1735a59ffd2ce2a4045bed035a133a121fcaa1df9a75d58fa563472692a","last_reissued_at":"2026-05-18T00:03:03.880726Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:03:03.880726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.05882","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":"2026-05-18T00:03:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Cl4fuFq42lJl8eDaLKVV90SVc4jCiJdx9WpC9DZH7fAaBD2/RjAkR6ZZYpb54/R67C37gjOIAwpzCiNre/ijCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T10:22:28.115166Z"},"content_sha256":"b730aa07eb1aae4e85c84d4a302f3cba6cb5db71578187497687373e12103fc0","schema_version":"1.0","event_id":"sha256:b730aa07eb1aae4e85c84d4a302f3cba6cb5db71578187497687373e12103fc0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:ETNNC422LH75FTRKIBC35UBVUE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Development of a Parallel-Plate Avalanche Counter with Optical Readout (O-PPAC)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"John Yurkon, Marco Cortesi, Yassid Ayyada","submitted_at":"2018-08-17T14:34:59Z","abstract_excerpt":"We describe a novel gaseous detector concept for heavy-ion tracking and imaging: the Optical Parallel-Plate Avalanche Counter (O-PPAC). The detector consists of two thin parallel-plate electrodes separated by a small (typically 3 mm) gap filled with low-pressure scintillating gas (i.e. CF4). The localization of the impinging particles is achieved by recording the secondary scintillation, created during the avalanche processes within the gas gap, with dedicated position-sensitive optical readouts. The latter may comprise arrays of collimated photo-sensors (e.g. SiPMs) that surround the PPAC eff"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05882","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":"2026-05-18T00:03:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kTASiQVkcG84M6HUiS8jLWQc1PGUlM2QJKrAeIvjOTKOdZ+etC7doeXKQK5E+yZBcC0ExzdvTc2hcDHZliQpDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T10:22:28.115531Z"},"content_sha256":"b5fb07adbe848ff29f2e0fcb4aea8b22a11a907fe76ef7d6999a8aacce5c30a7","schema_version":"1.0","event_id":"sha256:b5fb07adbe848ff29f2e0fcb4aea8b22a11a907fe76ef7d6999a8aacce5c30a7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ETNNC422LH75FTRKIBC35UBVUE/bundle.json","state_url":"https://pith.science/pith/ETNNC422LH75FTRKIBC35UBVUE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ETNNC422LH75FTRKIBC35UBVUE/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":"2026-06-11T10:22:28Z","links":{"resolver":"https://pith.science/pith/ETNNC422LH75FTRKIBC35UBVUE","bundle":"https://pith.science/pith/ETNNC422LH75FTRKIBC35UBVUE/bundle.json","state":"https://pith.science/pith/ETNNC422LH75FTRKIBC35UBVUE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ETNNC422LH75FTRKIBC35UBVUE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:ETNNC422LH75FTRKIBC35UBVUE","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":"0d32969a1a60806cc47b55629ab8e7ddcb97ef74d92152d25e23250e3e66f751","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-17T14:34:59Z","title_canon_sha256":"8ec5867e84e6c0e5bad4c12c6f3ffd64c9797f93cdb42e957a3e935281b4e642"},"schema_version":"1.0","source":{"id":"1808.05882","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.05882","created_at":"2026-05-18T00:03:03Z"},{"alias_kind":"arxiv_version","alias_value":"1808.05882v1","created_at":"2026-05-18T00:03:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.05882","created_at":"2026-05-18T00:03:03Z"},{"alias_kind":"pith_short_12","alias_value":"ETNNC422LH75","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"ETNNC422LH75FTRK","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"ETNNC422","created_at":"2026-05-18T12:32:22Z"}],"graph_snapshots":[{"event_id":"sha256:b5fb07adbe848ff29f2e0fcb4aea8b22a11a907fe76ef7d6999a8aacce5c30a7","target":"graph","created_at":"2026-05-18T00:03:03Z","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"},"paper":{"abstract_excerpt":"We describe a novel gaseous detector concept for heavy-ion tracking and imaging: the Optical Parallel-Plate Avalanche Counter (O-PPAC). The detector consists of two thin parallel-plate electrodes separated by a small (typically 3 mm) gap filled with low-pressure scintillating gas (i.e. CF4). The localization of the impinging particles is achieved by recording the secondary scintillation, created during the avalanche processes within the gas gap, with dedicated position-sensitive optical readouts. The latter may comprise arrays of collimated photo-sensors (e.g. SiPMs) that surround the PPAC eff","authors_text":"John Yurkon, Marco Cortesi, Yassid Ayyada","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-17T14:34:59Z","title":"Development of a Parallel-Plate Avalanche Counter with Optical Readout (O-PPAC)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05882","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:b730aa07eb1aae4e85c84d4a302f3cba6cb5db71578187497687373e12103fc0","target":"record","created_at":"2026-05-18T00:03:03Z","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":"0d32969a1a60806cc47b55629ab8e7ddcb97ef74d92152d25e23250e3e66f751","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-17T14:34:59Z","title_canon_sha256":"8ec5867e84e6c0e5bad4c12c6f3ffd64c9797f93cdb42e957a3e935281b4e642"},"schema_version":"1.0","source":{"id":"1808.05882","kind":"arxiv","version":1}},"canonical_sha256":"24dad1735a59ffd2ce2a4045bed035a133a121fcaa1df9a75d58fa563472692a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"24dad1735a59ffd2ce2a4045bed035a133a121fcaa1df9a75d58fa563472692a","first_computed_at":"2026-05-18T00:03:03.880726Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:03:03.880726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2BuCLIZD++1de8QxsrnVeVP5HbFyNzAXIL2lDlO49fmJdjYCinwB/tq2Fpr7c5iX38e5mW2QSyLmD75kQhaaCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:03:03.881420Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.05882","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b730aa07eb1aae4e85c84d4a302f3cba6cb5db71578187497687373e12103fc0","sha256:b5fb07adbe848ff29f2e0fcb4aea8b22a11a907fe76ef7d6999a8aacce5c30a7"],"state_sha256":"7cd5a385b3dc475c47f8e7ec80b9ca2e93e596b29192392a95a72f5c242fd63b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LXM4OETj9ClR457REqYvBLa4YJeyo0hZnojA9nUBCTyw0bgD0r7t8J8WsEo2B/KQ5uI1ZjFJz9SODilAoRY8DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T10:22:28.117613Z","bundle_sha256":"3afb20c2eaca6af1cf015408497bfa032c275c2eb42445fcd6f03ce8283f9390"}}