{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:4I6B7SHXQPYOOGOBKVLVV2NHPX","short_pith_number":"pith:4I6B7SHX","canonical_record":{"source":{"id":"2002.07632","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2020-02-18T15:12:52Z","cross_cats_sorted":[],"title_canon_sha256":"b7c20c1cefb56e9309464f5824c615ddadfa66a09452d7efc1b4c654622274a7","abstract_canon_sha256":"955edbe6d4110baeb09c270a5907baff65db79dc63a3371ca4e6a0792b0153fe"},"schema_version":"1.0"},"canonical_sha256":"e23c1fc8f783f0e719c155575ae9a77df756a570bd7694a265f5d135878d100e","source":{"kind":"arxiv","id":"2002.07632","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.07632","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"arxiv_version","alias_value":"2002.07632v1","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.07632","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"pith_short_12","alias_value":"4I6B7SHXQPYO","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"pith_short_16","alias_value":"4I6B7SHXQPYOOGOB","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"pith_short_8","alias_value":"4I6B7SHX","created_at":"2026-07-05T00:48:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:4I6B7SHXQPYOOGOBKVLVV2NHPX","target":"record","payload":{"canonical_record":{"source":{"id":"2002.07632","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2020-02-18T15:12:52Z","cross_cats_sorted":[],"title_canon_sha256":"b7c20c1cefb56e9309464f5824c615ddadfa66a09452d7efc1b4c654622274a7","abstract_canon_sha256":"955edbe6d4110baeb09c270a5907baff65db79dc63a3371ca4e6a0792b0153fe"},"schema_version":"1.0"},"canonical_sha256":"e23c1fc8f783f0e719c155575ae9a77df756a570bd7694a265f5d135878d100e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:48:56.464544Z","signature_b64":"/B1yNc7VYv647Pa6Fv/9pSG/FPUjjvmKgV1PyGg7jvpLzq4J7wmE+vpGwY4apJkETnDefJMuCB7rsTFKTyyPCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e23c1fc8f783f0e719c155575ae9a77df756a570bd7694a265f5d135878d100e","last_reissued_at":"2026-07-05T00:48:56.464144Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:48:56.464144Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2002.07632","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":"2026-07-05T00:48:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rnLJ/iRxB3TTFgSLJUqQp2xQxVj94yXJv5gq5Z2h+911C8RSOQ9p0mL+mXvBIFPyCdpJE7slOh3M3hmE+s+7Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T19:10:07.637819Z"},"content_sha256":"b4a8fbf553c25f1fca5413b08baa67ce1eb96e1c4aaa046b513f3158f80f3cf8","schema_version":"1.0","event_id":"sha256:b4a8fbf553c25f1fca5413b08baa67ce1eb96e1c4aaa046b513f3158f80f3cf8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:4I6B7SHXQPYOOGOBKVLVV2NHPX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Test-beam studies of a small-scale TORCH time-of-flight demonstrator","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"C. Frei, D. Cussans, D. Piedigrossi, E. P. M. Gabriel, J. Milnes, J. Rademacker, M. Kreps, M. Van Dijk, N. Brook, N. Harnew, R. Forty, R. Gao, S. Bhasin, T. Blake, T. Conneely, T. Gershon, T. Gys, T. Hadavizadeh, T. H. Hancock","submitted_at":"2020-02-18T15:12:52Z","abstract_excerpt":"TORCH is a time-of-flight detector designed to perform particle identification over the momentum range 2$-$10 GeV/c for a 10 m flight path. The detector exploits prompt Cherenkov light produced by charged particles traversing a quartz plate of 10 mm thickness. Photons are then trapped by total internal reflection and directed onto a detector plane instrumented with customised position-sensitive Micro-Channel Plate Photo-Multiplier Tube (MCP-PMT) detectors. A single-photon timing resolution of 70 ps is targeted to achieve the desired separation of pions and kaons, with an expectation of around "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.07632","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/2002.07632/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":"2026-07-05T00:48:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DqTGC6O2UeyM9mdHuHFK+W6doLOXLm9IiT1m+ZLWHc2V6ILTgEJ5EtLRYcst6LID3tH9tX9RmFRvXGuSXBssBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T19:10:07.638190Z"},"content_sha256":"adcb87b09ec32554cff220ce68acbd7a97df47a96e8d14d0a743caaeaaea5146","schema_version":"1.0","event_id":"sha256:adcb87b09ec32554cff220ce68acbd7a97df47a96e8d14d0a743caaeaaea5146"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4I6B7SHXQPYOOGOBKVLVV2NHPX/bundle.json","state_url":"https://pith.science/pith/4I6B7SHXQPYOOGOBKVLVV2NHPX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4I6B7SHXQPYOOGOBKVLVV2NHPX/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":"2026-07-08T19:10:07Z","links":{"resolver":"https://pith.science/pith/4I6B7SHXQPYOOGOBKVLVV2NHPX","bundle":"https://pith.science/pith/4I6B7SHXQPYOOGOBKVLVV2NHPX/bundle.json","state":"https://pith.science/pith/4I6B7SHXQPYOOGOBKVLVV2NHPX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4I6B7SHXQPYOOGOBKVLVV2NHPX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:4I6B7SHXQPYOOGOBKVLVV2NHPX","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":"955edbe6d4110baeb09c270a5907baff65db79dc63a3371ca4e6a0792b0153fe","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2020-02-18T15:12:52Z","title_canon_sha256":"b7c20c1cefb56e9309464f5824c615ddadfa66a09452d7efc1b4c654622274a7"},"schema_version":"1.0","source":{"id":"2002.07632","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.07632","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"arxiv_version","alias_value":"2002.07632v1","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.07632","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"pith_short_12","alias_value":"4I6B7SHXQPYO","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"pith_short_16","alias_value":"4I6B7SHXQPYOOGOB","created_at":"2026-07-05T00:48:56Z"},{"alias_kind":"pith_short_8","alias_value":"4I6B7SHX","created_at":"2026-07-05T00:48:56Z"}],"graph_snapshots":[{"event_id":"sha256:adcb87b09ec32554cff220ce68acbd7a97df47a96e8d14d0a743caaeaaea5146","target":"graph","created_at":"2026-07-05T00:48:56Z","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/2002.07632/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"TORCH is a time-of-flight detector designed to perform particle identification over the momentum range 2$-$10 GeV/c for a 10 m flight path. The detector exploits prompt Cherenkov light produced by charged particles traversing a quartz plate of 10 mm thickness. Photons are then trapped by total internal reflection and directed onto a detector plane instrumented with customised position-sensitive Micro-Channel Plate Photo-Multiplier Tube (MCP-PMT) detectors. A single-photon timing resolution of 70 ps is targeted to achieve the desired separation of pions and kaons, with an expectation of around ","authors_text":"C. Frei, D. Cussans, D. Piedigrossi, E. P. M. Gabriel, J. Milnes, J. Rademacker, M. Kreps, M. Van Dijk, N. Brook, N. Harnew, R. Forty, R. Gao, S. Bhasin, T. Blake, T. Conneely, T. Gershon, T. Gys, T. Hadavizadeh, T. H. Hancock","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2020-02-18T15:12:52Z","title":"Test-beam studies of a small-scale TORCH time-of-flight demonstrator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.07632","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:b4a8fbf553c25f1fca5413b08baa67ce1eb96e1c4aaa046b513f3158f80f3cf8","target":"record","created_at":"2026-07-05T00:48:56Z","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":"955edbe6d4110baeb09c270a5907baff65db79dc63a3371ca4e6a0792b0153fe","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2020-02-18T15:12:52Z","title_canon_sha256":"b7c20c1cefb56e9309464f5824c615ddadfa66a09452d7efc1b4c654622274a7"},"schema_version":"1.0","source":{"id":"2002.07632","kind":"arxiv","version":1}},"canonical_sha256":"e23c1fc8f783f0e719c155575ae9a77df756a570bd7694a265f5d135878d100e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e23c1fc8f783f0e719c155575ae9a77df756a570bd7694a265f5d135878d100e","first_computed_at":"2026-07-05T00:48:56.464144Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:48:56.464144Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/B1yNc7VYv647Pa6Fv/9pSG/FPUjjvmKgV1PyGg7jvpLzq4J7wmE+vpGwY4apJkETnDefJMuCB7rsTFKTyyPCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T00:48:56.464544Z","signed_message":"canonical_sha256_bytes"},"source_id":"2002.07632","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b4a8fbf553c25f1fca5413b08baa67ce1eb96e1c4aaa046b513f3158f80f3cf8","sha256:adcb87b09ec32554cff220ce68acbd7a97df47a96e8d14d0a743caaeaaea5146"],"state_sha256":"320c60762c542ada2a9b3fe19701af6579001a71253ef9a86fc0eb285773ca2f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lj1nw5JrKVfI9UmK0vwh55zAz3UuK4RhvpenZ0PHSinMZO2STmNzRY4zjehprdRhj4z21J14zfsiiPvDpt75Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-08T19:10:07.640401Z","bundle_sha256":"a2b15eb1b18b5cfcba60dd43682751e5d080f61f9afcf39c155d2e119b3004a7"}}