{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:OXRIL5CVUKOB26RJ27UTY4MNM6","short_pith_number":"pith:OXRIL5CV","canonical_record":{"source":{"id":"1209.4861","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-09-21T17:07:25Z","cross_cats_sorted":[],"title_canon_sha256":"cf0cfdd46ab356052c027b8a542c623312cd916badbcfb57b175b45c4bbcfe40","abstract_canon_sha256":"2ad8855122dfa6e1d5d2de3efc7fabbf634f6719db5ab844534ceeb0a543a1c2"},"schema_version":"1.0"},"canonical_sha256":"75e285f455a29c1d7a29d7e93c718d67bb627692a7d0f0d2a5d0357f32ee3f63","source":{"kind":"arxiv","id":"1209.4861","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.4861","created_at":"2026-05-18T01:54:20Z"},{"alias_kind":"arxiv_version","alias_value":"1209.4861v1","created_at":"2026-05-18T01:54:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.4861","created_at":"2026-05-18T01:54:20Z"},{"alias_kind":"pith_short_12","alias_value":"OXRIL5CVUKOB","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"OXRIL5CVUKOB26RJ","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"OXRIL5CV","created_at":"2026-05-18T12:27:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:OXRIL5CVUKOB26RJ27UTY4MNM6","target":"record","payload":{"canonical_record":{"source":{"id":"1209.4861","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-09-21T17:07:25Z","cross_cats_sorted":[],"title_canon_sha256":"cf0cfdd46ab356052c027b8a542c623312cd916badbcfb57b175b45c4bbcfe40","abstract_canon_sha256":"2ad8855122dfa6e1d5d2de3efc7fabbf634f6719db5ab844534ceeb0a543a1c2"},"schema_version":"1.0"},"canonical_sha256":"75e285f455a29c1d7a29d7e93c718d67bb627692a7d0f0d2a5d0357f32ee3f63","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:20.082723Z","signature_b64":"uDFYmrq3H6V+r4HncIYEEQGI8hNtUe1r7zZSl9Blom61RNMwxRb58q/XmhVadSIyB0DdgaZF0iiwdWyrdVyyBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"75e285f455a29c1d7a29d7e93c718d67bb627692a7d0f0d2a5d0357f32ee3f63","last_reissued_at":"2026-05-18T01:54:20.082093Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:20.082093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.4861","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":"2026-05-18T01:54:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Tj4g+Dm4+z3LsbORV2G1xA/tQRVemKDy3G0IcTtbpPRhIpFzhmpWlOQopv8S2Wml9J+M8m5ihiQiOYDn7v2vAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:54:21.239698Z"},"content_sha256":"41eec2f12be2abf2600f5f9b8ab46bbc333b51454f1ddb5263ef82854ee94157","schema_version":"1.0","event_id":"sha256:41eec2f12be2abf2600f5f9b8ab46bbc333b51454f1ddb5263ef82854ee94157"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:OXRIL5CVUKOB26RJ27UTY4MNM6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Deep blank field catalogue for medium- and large-size telescopes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. Cabrera-Lavers, F. M. Jim\\'enez-Esteban, J. M. Alacid, N. Cardiel","submitted_at":"2012-09-21T17:07:25Z","abstract_excerpt":"The observation of blank fields, defined as regions of the sky that are devoid of stars down to a given threshold magnitude, constitutes one of the most relevant calibration procedures required for the proper reduction of astronomical data obtained following typical observing strategies. In this work, we have used the Delaunay triangulation to search for deep blank fields throughout the whole sky, with a minimum size of 10 arcmin in diameter and an increasing threshold magnitude from 15 to 18 in the R band of the USNO-B Catalog of the United States Naval Observatory. The result is a catalogue "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.4861","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":"2026-05-18T01:54:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aHMLvQc4uZ2gwKjktY0WMQ+YVm3uS/Z3XTpbZd647gtTMHYJPytYkECt87qZIXRA7CoYtK/XfCe/ROFwEWTECQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:54:21.240046Z"},"content_sha256":"3b64ddb1aa9e72c129731e3d1ccf7ac85e185937f3b9d75149331450e2876f56","schema_version":"1.0","event_id":"sha256:3b64ddb1aa9e72c129731e3d1ccf7ac85e185937f3b9d75149331450e2876f56"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OXRIL5CVUKOB26RJ27UTY4MNM6/bundle.json","state_url":"https://pith.science/pith/OXRIL5CVUKOB26RJ27UTY4MNM6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OXRIL5CVUKOB26RJ27UTY4MNM6/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":"2026-06-03T16:54:21Z","links":{"resolver":"https://pith.science/pith/OXRIL5CVUKOB26RJ27UTY4MNM6","bundle":"https://pith.science/pith/OXRIL5CVUKOB26RJ27UTY4MNM6/bundle.json","state":"https://pith.science/pith/OXRIL5CVUKOB26RJ27UTY4MNM6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OXRIL5CVUKOB26RJ27UTY4MNM6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:OXRIL5CVUKOB26RJ27UTY4MNM6","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":"2ad8855122dfa6e1d5d2de3efc7fabbf634f6719db5ab844534ceeb0a543a1c2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-09-21T17:07:25Z","title_canon_sha256":"cf0cfdd46ab356052c027b8a542c623312cd916badbcfb57b175b45c4bbcfe40"},"schema_version":"1.0","source":{"id":"1209.4861","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.4861","created_at":"2026-05-18T01:54:20Z"},{"alias_kind":"arxiv_version","alias_value":"1209.4861v1","created_at":"2026-05-18T01:54:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.4861","created_at":"2026-05-18T01:54:20Z"},{"alias_kind":"pith_short_12","alias_value":"OXRIL5CVUKOB","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"OXRIL5CVUKOB26RJ","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"OXRIL5CV","created_at":"2026-05-18T12:27:18Z"}],"graph_snapshots":[{"event_id":"sha256:3b64ddb1aa9e72c129731e3d1ccf7ac85e185937f3b9d75149331450e2876f56","target":"graph","created_at":"2026-05-18T01:54:20Z","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":"The observation of blank fields, defined as regions of the sky that are devoid of stars down to a given threshold magnitude, constitutes one of the most relevant calibration procedures required for the proper reduction of astronomical data obtained following typical observing strategies. In this work, we have used the Delaunay triangulation to search for deep blank fields throughout the whole sky, with a minimum size of 10 arcmin in diameter and an increasing threshold magnitude from 15 to 18 in the R band of the USNO-B Catalog of the United States Naval Observatory. The result is a catalogue ","authors_text":"A. Cabrera-Lavers, F. M. Jim\\'enez-Esteban, J. M. Alacid, N. Cardiel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-09-21T17:07:25Z","title":"Deep blank field catalogue for medium- and large-size telescopes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.4861","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":"sha256:41eec2f12be2abf2600f5f9b8ab46bbc333b51454f1ddb5263ef82854ee94157","target":"record","created_at":"2026-05-18T01:54:20Z","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":"2ad8855122dfa6e1d5d2de3efc7fabbf634f6719db5ab844534ceeb0a543a1c2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-09-21T17:07:25Z","title_canon_sha256":"cf0cfdd46ab356052c027b8a542c623312cd916badbcfb57b175b45c4bbcfe40"},"schema_version":"1.0","source":{"id":"1209.4861","kind":"arxiv","version":1}},"canonical_sha256":"75e285f455a29c1d7a29d7e93c718d67bb627692a7d0f0d2a5d0357f32ee3f63","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"75e285f455a29c1d7a29d7e93c718d67bb627692a7d0f0d2a5d0357f32ee3f63","first_computed_at":"2026-05-18T01:54:20.082093Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:20.082093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uDFYmrq3H6V+r4HncIYEEQGI8hNtUe1r7zZSl9Blom61RNMwxRb58q/XmhVadSIyB0DdgaZF0iiwdWyrdVyyBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:20.082723Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.4861","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:41eec2f12be2abf2600f5f9b8ab46bbc333b51454f1ddb5263ef82854ee94157","sha256:3b64ddb1aa9e72c129731e3d1ccf7ac85e185937f3b9d75149331450e2876f56"],"state_sha256":"fbf21488ed46d071dfc33557f6968c67723709e8fe7e03628c5a0da47062534d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9wtq/XUKfg8094oC4Y+Ga03sWYOjxoq8lFm35bP1FJFX5ycqXCijvNeLYECVSlH64rq8Ir7ROzTByjkc85NjCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T16:54:21.242086Z","bundle_sha256":"fd65a183e4cd6fcc894216a84de2fceaf7a9c196942b6c971a0a2b5c69501543"}}