{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:4R6ERMXZX7CBJNJK2ZXK4K3AMZ","short_pith_number":"pith:4R6ERMXZ","canonical_record":{"source":{"id":"2111.08301","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2021-11-16T08:49:14Z","cross_cats_sorted":[],"title_canon_sha256":"fad8881d4f6b6dfb75ea8eac0472461be6b2b38f3ba8b15f8f0812bd171c6d87","abstract_canon_sha256":"5a121b1e60aa0843b117c57b6b1321c387ba7b28756bc7f15e02d102d6955342"},"schema_version":"1.0"},"canonical_sha256":"e47c48b2f9bfc414b52ad66eae2b606670aad88489fdd0b545b8689a3e2ca650","source":{"kind":"arxiv","id":"2111.08301","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.08301","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"arxiv_version","alias_value":"2111.08301v3","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.08301","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"pith_short_12","alias_value":"4R6ERMXZX7CB","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"pith_short_16","alias_value":"4R6ERMXZX7CBJNJK","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"pith_short_8","alias_value":"4R6ERMXZ","created_at":"2026-07-05T04:15:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:4R6ERMXZX7CBJNJK2ZXK4K3AMZ","target":"record","payload":{"canonical_record":{"source":{"id":"2111.08301","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2021-11-16T08:49:14Z","cross_cats_sorted":[],"title_canon_sha256":"fad8881d4f6b6dfb75ea8eac0472461be6b2b38f3ba8b15f8f0812bd171c6d87","abstract_canon_sha256":"5a121b1e60aa0843b117c57b6b1321c387ba7b28756bc7f15e02d102d6955342"},"schema_version":"1.0"},"canonical_sha256":"e47c48b2f9bfc414b52ad66eae2b606670aad88489fdd0b545b8689a3e2ca650","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:15:50.033381Z","signature_b64":"etu8ewwTi6tT2D4jkCw6d+NXrNRmmS92fHm1EBqSygL/g8HBSRD5saPNKIF9ueTsIprcZZ8AIGvZWr0a8P2fCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e47c48b2f9bfc414b52ad66eae2b606670aad88489fdd0b545b8689a3e2ca650","last_reissued_at":"2026-07-05T04:15:50.032757Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:15:50.032757Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2111.08301","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:15:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"05xzEnZqiTlyA2h3ILSGtbgpFl1n/o2pigL+oOYPNQXyWttxD8IPZG18Gg0eMMaHAqESHOdSCcO1yVtylmEsCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T02:53:04.428146Z"},"content_sha256":"72d3b75d103df2dafe9b35aaf67e82ab79edf176df84779f51c8ce326205d7c4","schema_version":"1.0","event_id":"sha256:72d3b75d103df2dafe9b35aaf67e82ab79edf176df84779f51c8ce326205d7c4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:4R6ERMXZX7CBJNJK2ZXK4K3AMZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Upgrade of the ALICE ITS detector","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"Felix Reidt (on behalf of the ALICE collaboration)","submitted_at":"2021-11-16T08:49:14Z","abstract_excerpt":"The ALICE experiment at CERN has undergone a major upgrade during the Long Shutdown 2 of the LHC during 2019-2021. A key element is the installation of the new Inner Tracking System 2 (ITS2). The new ITS2 based on CMOS Monolithic Active Pixel Sensors will significantly improve the impact parameter resolution and the tracking efficiency, especially for particles with low transverse momenta, as well as the readout-rate capability. In the following, the upgrade and its commissioning status as well installation status will be outlined."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.08301","kind":"arxiv","version":3},"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/2111.08301/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":"2026-07-05T04:15:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wurkz6OjYrAc5t4Jf2dY+ijiqs3dWQN9fsTW4wwdOv/qsVp+xr15EIwuigoN8j4vMIr9yP371sD5nBYRlaIQBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T02:53:04.428479Z"},"content_sha256":"8678f9e26120824c8798e2ca11a45297cd3caee916256515a31059c08a610dc3","schema_version":"1.0","event_id":"sha256:8678f9e26120824c8798e2ca11a45297cd3caee916256515a31059c08a610dc3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4R6ERMXZX7CBJNJK2ZXK4K3AMZ/bundle.json","state_url":"https://pith.science/pith/4R6ERMXZX7CBJNJK2ZXK4K3AMZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4R6ERMXZX7CBJNJK2ZXK4K3AMZ/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":"2026-08-15T02:53:04Z","links":{"resolver":"https://pith.science/pith/4R6ERMXZX7CBJNJK2ZXK4K3AMZ","bundle":"https://pith.science/pith/4R6ERMXZX7CBJNJK2ZXK4K3AMZ/bundle.json","state":"https://pith.science/pith/4R6ERMXZX7CBJNJK2ZXK4K3AMZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4R6ERMXZX7CBJNJK2ZXK4K3AMZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:4R6ERMXZX7CBJNJK2ZXK4K3AMZ","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":"5a121b1e60aa0843b117c57b6b1321c387ba7b28756bc7f15e02d102d6955342","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2021-11-16T08:49:14Z","title_canon_sha256":"fad8881d4f6b6dfb75ea8eac0472461be6b2b38f3ba8b15f8f0812bd171c6d87"},"schema_version":"1.0","source":{"id":"2111.08301","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.08301","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"arxiv_version","alias_value":"2111.08301v3","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.08301","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"pith_short_12","alias_value":"4R6ERMXZX7CB","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"pith_short_16","alias_value":"4R6ERMXZX7CBJNJK","created_at":"2026-07-05T04:15:50Z"},{"alias_kind":"pith_short_8","alias_value":"4R6ERMXZ","created_at":"2026-07-05T04:15:50Z"}],"graph_snapshots":[{"event_id":"sha256:8678f9e26120824c8798e2ca11a45297cd3caee916256515a31059c08a610dc3","target":"graph","created_at":"2026-07-05T04:15:50Z","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/2111.08301/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The ALICE experiment at CERN has undergone a major upgrade during the Long Shutdown 2 of the LHC during 2019-2021. A key element is the installation of the new Inner Tracking System 2 (ITS2). The new ITS2 based on CMOS Monolithic Active Pixel Sensors will significantly improve the impact parameter resolution and the tracking efficiency, especially for particles with low transverse momenta, as well as the readout-rate capability. In the following, the upgrade and its commissioning status as well installation status will be outlined.","authors_text":"Felix Reidt (on behalf of the ALICE collaboration)","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2021-11-16T08:49:14Z","title":"Upgrade of the ALICE ITS detector"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.08301","kind":"arxiv","version":3},"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":"sha256:72d3b75d103df2dafe9b35aaf67e82ab79edf176df84779f51c8ce326205d7c4","target":"record","created_at":"2026-07-05T04:15:50Z","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":"5a121b1e60aa0843b117c57b6b1321c387ba7b28756bc7f15e02d102d6955342","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2021-11-16T08:49:14Z","title_canon_sha256":"fad8881d4f6b6dfb75ea8eac0472461be6b2b38f3ba8b15f8f0812bd171c6d87"},"schema_version":"1.0","source":{"id":"2111.08301","kind":"arxiv","version":3}},"canonical_sha256":"e47c48b2f9bfc414b52ad66eae2b606670aad88489fdd0b545b8689a3e2ca650","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e47c48b2f9bfc414b52ad66eae2b606670aad88489fdd0b545b8689a3e2ca650","first_computed_at":"2026-07-05T04:15:50.032757Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:15:50.032757Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"etu8ewwTi6tT2D4jkCw6d+NXrNRmmS92fHm1EBqSygL/g8HBSRD5saPNKIF9ueTsIprcZZ8AIGvZWr0a8P2fCw==","signature_status":"signed_v1","signed_at":"2026-07-05T04:15:50.033381Z","signed_message":"canonical_sha256_bytes"},"source_id":"2111.08301","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:72d3b75d103df2dafe9b35aaf67e82ab79edf176df84779f51c8ce326205d7c4","sha256:8678f9e26120824c8798e2ca11a45297cd3caee916256515a31059c08a610dc3"],"state_sha256":"f1ccb36af2415bc7a99e86124b15ace2685f007f9b76fcd42c8ada50990ebef1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hyAdPvBAjSaXliB8lAvnZKrqdlwIy7h2jB3XuKUNYIPmceQdwjX1f10tqZlASO4G2SaWpkivRGbK7b40A2DECQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T02:53:04.431452Z","bundle_sha256":"ea8983a03e9f3b1a10f5cf8a4a033ba29395e2a3211fa95c7f498c96aabb1b82"}}