{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:DHJMDIGQY6HDJAVSFYX4W7NJX7","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":"cc41628e7ec6f3996887da1d60c959e7f0cf36d978c6b5cdeda49b84d9c3b7e6","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-12-23T03:35:54Z","title_canon_sha256":"b736807d6b5b91409bf7f57f579ade8e000b47b728dd15bd186c49651e6da586"},"schema_version":"1.0","source":{"id":"1612.07864","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.07864","created_at":"2026-05-18T00:47:05Z"},{"alias_kind":"arxiv_version","alias_value":"1612.07864v1","created_at":"2026-05-18T00:47:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.07864","created_at":"2026-05-18T00:47:05Z"},{"alias_kind":"pith_short_12","alias_value":"DHJMDIGQY6HD","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_16","alias_value":"DHJMDIGQY6HDJAVS","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_8","alias_value":"DHJMDIGQ","created_at":"2026-05-18T12:30:12Z"}],"graph_snapshots":[{"event_id":"sha256:67f782d0a79f62ff54f45dac97bc50b8d514502f22ee0bf629f2b109a0b5a208","target":"graph","created_at":"2026-05-18T00:47:05Z","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":"Hardware injections are simulated gravitational-wave signals added to the Laser Interferometer Gravitational-wave Observatory (LIGO). The detectors' test masses are physically displaced by an actuator in order to simulate the effects of a gravitational wave. The simulated signal initiates a control-system response which mimics that of a true gravitational wave. This provides an end-to-end test of LIGO's ability to observe gravitational waves. The gravitational-wave analyses used to detect and characterize signals are exercised with hardware injections. By looking for discrepancies between the ","authors_text":"A. J. Weinstein, A. Mullavey, A. P. Lundgren, B. Allen, C. Biwer, C. Lazzaro, D. A. Brown, D. Barker, D. H. Shoemaker, D. M. Macleod, D. Sigg, E. Goetz, E. Katsavounidis, E. Thrane, F. Pannarale, J. Betzwieser, J. B. Kanner, J. C. Batch, J. G. Rollins, J. Lange, J. R. Smith, J. S. Kissel, J. Veitch, K. A. Thorne, K. Riles, L. Sun, M. Fays, M. Landry, M. Millhouse, M. Pitkin, N. Cornish, P. Charlton, P. Fritschel, P. M. Meyers, P. Shawhan, R. C. Essick, R. L. Savage, R. Lynch, R. O'Shaughnessy, R. P. Fisher, R. Prix, S. G. Crowder, S. Kandhasamy, S. Karki, S. Vitale, T. B. Littenberg, T. D. Abbott","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-12-23T03:35:54Z","title":"Validating gravitational-wave detections: The Advanced LIGO hardware injection system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.07864","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:fab1d292b0f7ab1303ffd20897bf100c28caf9c8767063d5648257619d400fb5","target":"record","created_at":"2026-05-18T00:47:05Z","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":"cc41628e7ec6f3996887da1d60c959e7f0cf36d978c6b5cdeda49b84d9c3b7e6","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-12-23T03:35:54Z","title_canon_sha256":"b736807d6b5b91409bf7f57f579ade8e000b47b728dd15bd186c49651e6da586"},"schema_version":"1.0","source":{"id":"1612.07864","kind":"arxiv","version":1}},"canonical_sha256":"19d2c1a0d0c78e3482b22e2fcb7da9bfd2fc6ddfa26588151f243915421fcc3b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"19d2c1a0d0c78e3482b22e2fcb7da9bfd2fc6ddfa26588151f243915421fcc3b","first_computed_at":"2026-05-18T00:47:05.054451Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:47:05.054451Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vArk9PW6fZVlK3uT38aoUHtGegTK3Q/h2zKGTgzMj2EtmEp0NMiLIutzZzt82OJwdDwykOl1P1eKi3K7lHRaCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:47:05.054844Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.07864","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fab1d292b0f7ab1303ffd20897bf100c28caf9c8767063d5648257619d400fb5","sha256:67f782d0a79f62ff54f45dac97bc50b8d514502f22ee0bf629f2b109a0b5a208"],"state_sha256":"3d7409d85dfe7e09c35e19d232d82fe1270e9cbdda690a77e91b8ea19a5ac2c7"}