{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:ZPPC76QBPINW4RQSWBL3LOCLCD","short_pith_number":"pith:ZPPC76QB","canonical_record":{"source":{"id":"1901.08002","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-01-23T17:03:41Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"76bd03ed4f38bad74cfdde027c22e2ca88ad38de6db8f367cbe0b4cdf4f638d9","abstract_canon_sha256":"bd329a4a054560607f08ae463ca6fb7bc179ef1bbf7e9c857ae34c572fbb81db"},"schema_version":"1.0"},"canonical_sha256":"cbde2ffa017a1b6e4612b057b5b84b10c4495087603b9bed53fd58d583d2a7cc","source":{"kind":"arxiv","id":"1901.08002","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.08002","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"arxiv_version","alias_value":"1901.08002v1","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.08002","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"pith_short_12","alias_value":"ZPPC76QBPINW","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"ZPPC76QBPINW4RQS","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"ZPPC76QB","created_at":"2026-05-18T12:33:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:ZPPC76QBPINW4RQSWBL3LOCLCD","target":"record","payload":{"canonical_record":{"source":{"id":"1901.08002","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-01-23T17:03:41Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"76bd03ed4f38bad74cfdde027c22e2ca88ad38de6db8f367cbe0b4cdf4f638d9","abstract_canon_sha256":"bd329a4a054560607f08ae463ca6fb7bc179ef1bbf7e9c857ae34c572fbb81db"},"schema_version":"1.0"},"canonical_sha256":"cbde2ffa017a1b6e4612b057b5b84b10c4495087603b9bed53fd58d583d2a7cc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:39.347029Z","signature_b64":"VOpRGB9R3zJcakw60PXpdxzZG0VsAVw/NHsYPSXGN56I+KWt4RKeyg6eMtxOlRNA1dYgunO2+cu5QqLc4ZcwBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cbde2ffa017a1b6e4612b057b5b84b10c4495087603b9bed53fd58d583d2a7cc","last_reissued_at":"2026-05-17T23:55:39.346501Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:39.346501Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.08002","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":"2026-05-17T23:55:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IGhT9qHIjK82YAxYlQ1wH/EtQ+XHzvuq/KmxRRNETZoJlEW19rg0ea98jI+oX5FAf5/GBr64oFQ0dloCTNI9Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-14T05:23:50.623846Z"},"content_sha256":"72aaf00fbdf888b7779ba7f771492ee73b2411939e8b2efdd3d6a3b70eac3e55","schema_version":"1.0","event_id":"sha256:72aaf00fbdf888b7779ba7f771492ee73b2411939e8b2efdd3d6a3b70eac3e55"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:ZPPC76QBPINW4RQSWBL3LOCLCD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The LHCSpin Project","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-ex","authors_text":"A. Bacchetta, A. Metz, A. Nass, A. Vasilyev, B. Pasquini, C.A. Aidala, C. Pisano, D. Keller, D. Panzieri, D. Reggiani, E. Steffens, F. Murgia, F. Rathmann, G. Bozzi, G. Ciullo, K. Grigoryev, L.L. Pappalardo, M. Boglione, M. Chiosso, M. Contalbrigo, M. Radici, M. Schlegel, P. Di Nezza, P.J. Mulders, P. Lenisa, R. Cimino, R. Engels, S. Liuti, S. Scopetta, U. D'Alesio, V. Carassiti","submitted_at":"2019-01-23T17:03:41Z","abstract_excerpt":"LHCSpin aims at installing a polarized gas target in front of the LHCb spectrometer, bringing, for the first time, polarized physics to the LHC. The project will benefit from the experience achieved with the installation of an unpolarized gas target at LHCb during the LHC Long Shutdown 2. LHCb will then become the first experiment simultaneously running in collider and fixed-target mode with polarized targets, opening a whole new range of explorations to its exceptional spectrometer.\n  LHCSpin will offer a unique opportunity to probe polarized quark and gluon parton distributions in nucleons a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.08002","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":"2026-05-17T23:55:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WwVGnTQaDquPBVm/EWDL44Nd/tMG3c7MTZiIIegtiNNvz9tOyjAXiMXrsoxtJ4qwI+YOhUAitEcQffO6/2ePDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-14T05:23:50.624203Z"},"content_sha256":"4438a663ba13a9973b2842dd34373645f49e7d939cfcf3e5be27eb1a4099fc45","schema_version":"1.0","event_id":"sha256:4438a663ba13a9973b2842dd34373645f49e7d939cfcf3e5be27eb1a4099fc45"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZPPC76QBPINW4RQSWBL3LOCLCD/bundle.json","state_url":"https://pith.science/pith/ZPPC76QBPINW4RQSWBL3LOCLCD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZPPC76QBPINW4RQSWBL3LOCLCD/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":"2026-07-14T05:23:50Z","links":{"resolver":"https://pith.science/pith/ZPPC76QBPINW4RQSWBL3LOCLCD","bundle":"https://pith.science/pith/ZPPC76QBPINW4RQSWBL3LOCLCD/bundle.json","state":"https://pith.science/pith/ZPPC76QBPINW4RQSWBL3LOCLCD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZPPC76QBPINW4RQSWBL3LOCLCD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:ZPPC76QBPINW4RQSWBL3LOCLCD","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":"bd329a4a054560607f08ae463ca6fb7bc179ef1bbf7e9c857ae34c572fbb81db","cross_cats_sorted":["hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-01-23T17:03:41Z","title_canon_sha256":"76bd03ed4f38bad74cfdde027c22e2ca88ad38de6db8f367cbe0b4cdf4f638d9"},"schema_version":"1.0","source":{"id":"1901.08002","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.08002","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"arxiv_version","alias_value":"1901.08002v1","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.08002","created_at":"2026-05-17T23:55:39Z"},{"alias_kind":"pith_short_12","alias_value":"ZPPC76QBPINW","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"ZPPC76QBPINW4RQS","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"ZPPC76QB","created_at":"2026-05-18T12:33:33Z"}],"graph_snapshots":[{"event_id":"sha256:4438a663ba13a9973b2842dd34373645f49e7d939cfcf3e5be27eb1a4099fc45","target":"graph","created_at":"2026-05-17T23:55:39Z","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":"LHCSpin aims at installing a polarized gas target in front of the LHCb spectrometer, bringing, for the first time, polarized physics to the LHC. The project will benefit from the experience achieved with the installation of an unpolarized gas target at LHCb during the LHC Long Shutdown 2. LHCb will then become the first experiment simultaneously running in collider and fixed-target mode with polarized targets, opening a whole new range of explorations to its exceptional spectrometer.\n  LHCSpin will offer a unique opportunity to probe polarized quark and gluon parton distributions in nucleons a","authors_text":"A. Bacchetta, A. Metz, A. Nass, A. Vasilyev, B. Pasquini, C.A. Aidala, C. Pisano, D. Keller, D. Panzieri, D. Reggiani, E. Steffens, F. Murgia, F. Rathmann, G. Bozzi, G. Ciullo, K. Grigoryev, L.L. Pappalardo, M. Boglione, M. Chiosso, M. Contalbrigo, M. Radici, M. Schlegel, P. Di Nezza, P.J. Mulders, P. Lenisa, R. Cimino, R. Engels, S. Liuti, S. Scopetta, U. D'Alesio, V. Carassiti","cross_cats":["hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-01-23T17:03:41Z","title":"The LHCSpin Project"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.08002","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":"sha256:72aaf00fbdf888b7779ba7f771492ee73b2411939e8b2efdd3d6a3b70eac3e55","target":"record","created_at":"2026-05-17T23:55:39Z","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":"bd329a4a054560607f08ae463ca6fb7bc179ef1bbf7e9c857ae34c572fbb81db","cross_cats_sorted":["hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2019-01-23T17:03:41Z","title_canon_sha256":"76bd03ed4f38bad74cfdde027c22e2ca88ad38de6db8f367cbe0b4cdf4f638d9"},"schema_version":"1.0","source":{"id":"1901.08002","kind":"arxiv","version":1}},"canonical_sha256":"cbde2ffa017a1b6e4612b057b5b84b10c4495087603b9bed53fd58d583d2a7cc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cbde2ffa017a1b6e4612b057b5b84b10c4495087603b9bed53fd58d583d2a7cc","first_computed_at":"2026-05-17T23:55:39.346501Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:39.346501Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VOpRGB9R3zJcakw60PXpdxzZG0VsAVw/NHsYPSXGN56I+KWt4RKeyg6eMtxOlRNA1dYgunO2+cu5QqLc4ZcwBw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:39.347029Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.08002","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:72aaf00fbdf888b7779ba7f771492ee73b2411939e8b2efdd3d6a3b70eac3e55","sha256:4438a663ba13a9973b2842dd34373645f49e7d939cfcf3e5be27eb1a4099fc45"],"state_sha256":"f9ebe88a7a9cd74cb18435fa5994bbd27e0b4b2a1c81e66bf42056c3050f9d9b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DXF11K1WKvJXG8T5+996KAo30S/xRl3O8gbqghtfXoYZXL3W7ZeEyBEkdKMz2BE9amPE4grtpk61soT/zbyGAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-14T05:23:50.626630Z","bundle_sha256":"78bde50d11f2b3af0bb9bdfd0a13e727384168e4d2da1ef8f3a7d449728fb432"}}