{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:YIUAWNW74HUQ37DCXZXEU44ZLJ","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":"5cd2644d572d503df247e75a093a8cbcf18c9ef4f7c31ea00ef00191e852c534","cross_cats_sorted":["cs.CC","cs.LO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AI","submitted_at":"2016-06-11T21:49:24Z","title_canon_sha256":"0af9614e5a39f84bf69ffe37a22c6b8cd1762723245a8f6efa95751bc2efae96"},"schema_version":"1.0","source":{"id":"1606.03634","kind":"arxiv","version":5}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.03634","created_at":"2026-05-17T23:56:30Z"},{"alias_kind":"arxiv_version","alias_value":"1606.03634v5","created_at":"2026-05-17T23:56:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.03634","created_at":"2026-05-17T23:56:30Z"},{"alias_kind":"pith_short_12","alias_value":"YIUAWNW74HUQ","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YIUAWNW74HUQ37DC","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YIUAWNW7","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:58c082d7d67765ce02f6fb8957cae7e4031f8c0b5293d9744504d66a8ec38714","target":"graph","created_at":"2026-05-17T23:56:30Z","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":"This paper approaches, using structural complexity theory, the question of whether there is a chasm between knowing an object exists and getting one's hands on the object or its properties. In particular, we study the nontransparency of so-called backbones. A backbone of a boolean formula $F$ is a collection $S$ of its variables for which there is a unique partial assignment $a_S$ such that $F[a_S]$ is satisfiable [MZK+99,WGS03]. We show that, under the widely believed assumption that integer factoring is hard, there exist sets of boolean formulas that have obvious, nontrivial backbones yet fi","authors_text":"David E. Narv\\'aez, Lane A. Hemaspaandra","cross_cats":["cs.CC","cs.LO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AI","submitted_at":"2016-06-11T21:49:24Z","title":"The Opacity of Backbones"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.03634","kind":"arxiv","version":5},"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":"sha256:0503cca94a532ae5e95cc8b1b8e4295ff40f34af4bf954c5edc0887abb4413c2","target":"record","created_at":"2026-05-17T23:56:30Z","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":"5cd2644d572d503df247e75a093a8cbcf18c9ef4f7c31ea00ef00191e852c534","cross_cats_sorted":["cs.CC","cs.LO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AI","submitted_at":"2016-06-11T21:49:24Z","title_canon_sha256":"0af9614e5a39f84bf69ffe37a22c6b8cd1762723245a8f6efa95751bc2efae96"},"schema_version":"1.0","source":{"id":"1606.03634","kind":"arxiv","version":5}},"canonical_sha256":"c2280b36dfe1e90dfc62be6e4a73995a4b4e6353129e7ab2be5e7c3ad03e295a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c2280b36dfe1e90dfc62be6e4a73995a4b4e6353129e7ab2be5e7c3ad03e295a","first_computed_at":"2026-05-17T23:56:30.448873Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:56:30.448873Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yFQ5HZcfgo2wQYdnv5CiNLIEwQz3fg4Z+vfnsA1hSBsdK/K/rTpTKyB8yWuDbd2yE5uO2jRZ+v36r7yVt0QoCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:56:30.449442Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.03634","source_kind":"arxiv","source_version":5}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0503cca94a532ae5e95cc8b1b8e4295ff40f34af4bf954c5edc0887abb4413c2","sha256:58c082d7d67765ce02f6fb8957cae7e4031f8c0b5293d9744504d66a8ec38714"],"state_sha256":"72c31c19bc66f0632d0236eef96155cf816eb60a58700940fa9f1fb6126a6147"}