{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:62MVA3VYT6GJKET37AJSMBL5ZF","short_pith_number":"pith:62MVA3VY","canonical_record":{"source":{"id":"1204.2173","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-10T15:03:39Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"063f31eba8eb6f03ccf3f608c70c36a1a85f7e148761a17c21b588456f4323cc","abstract_canon_sha256":"3879b3508655beab5b39f5dfcc7e4ca1c067602cea53e90c04b59463bfb004db"},"schema_version":"1.0"},"canonical_sha256":"f699506eb89f8c95127bf81326057dc96f999b613a1c1878fc7597dfd89796b2","source":{"kind":"arxiv","id":"1204.2173","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.2173","created_at":"2026-05-18T01:57:54Z"},{"alias_kind":"arxiv_version","alias_value":"1204.2173v1","created_at":"2026-05-18T01:57:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.2173","created_at":"2026-05-18T01:57:54Z"},{"alias_kind":"pith_short_12","alias_value":"62MVA3VYT6GJ","created_at":"2026-05-18T12:26:56Z"},{"alias_kind":"pith_short_16","alias_value":"62MVA3VYT6GJKET3","created_at":"2026-05-18T12:26:56Z"},{"alias_kind":"pith_short_8","alias_value":"62MVA3VY","created_at":"2026-05-18T12:26:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:62MVA3VYT6GJKET37AJSMBL5ZF","target":"record","payload":{"canonical_record":{"source":{"id":"1204.2173","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-10T15:03:39Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"063f31eba8eb6f03ccf3f608c70c36a1a85f7e148761a17c21b588456f4323cc","abstract_canon_sha256":"3879b3508655beab5b39f5dfcc7e4ca1c067602cea53e90c04b59463bfb004db"},"schema_version":"1.0"},"canonical_sha256":"f699506eb89f8c95127bf81326057dc96f999b613a1c1878fc7597dfd89796b2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:54.011341Z","signature_b64":"t0b/EN1ZGOMh0acjh7CkvT7WvHpy5l7AbhLPT5hmPz2tTJtbYtN5F3YP24ea3+iN1kZDvY6RroC0nt3Du+rODg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f699506eb89f8c95127bf81326057dc96f999b613a1c1878fc7597dfd89796b2","last_reissued_at":"2026-05-18T01:57:54.010814Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:54.010814Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.2173","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":"2026-05-18T01:57:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ulrxPMXjKLEo549J9dh554l5iBfdhueTJMhADnw9R1XD2DuqvrAfht/syHMi9MLkc4vUDfYapzgJPCvbakSmBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T12:13:23.325141Z"},"content_sha256":"50fdbe6fa25a431529196b92b8b4b5b43596799351eab6d9f67c8bc00d3c89e7","schema_version":"1.0","event_id":"sha256:50fdbe6fa25a431529196b92b8b4b5b43596799351eab6d9f67c8bc00d3c89e7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:62MVA3VYT6GJKET37AJSMBL5ZF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Recent developments in the search for Compton-thick AGN","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.CO","authors_text":"I. Georgantopoulos (OABO/INAF)","submitted_at":"2012-04-10T15:03:39Z","abstract_excerpt":"I present a review of X-ray and mid-IR surveys for Compton-thick Active Galactic Nuclei (AGN). These are the most highly obscured sources having hydrogen column densities >1.5x10^24 cm-2. Key surveys in the local Universe are presented including the high energy SWIFT/BAT and INTEGRAL surveys, mid-IR and also optical surveys. Recently, deep X-ray surveys with Chandra and XMM-Newton have produced a number of candidate Compton-thick AGN at higher redshift primarily in the Chandra Deep Field South region. In addition, mid-IR surveys with Spitzer have helped to develop novel complementary technique"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.2173","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":"2026-05-18T01:57:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QHYYL8wDw47T6Hxt3jAyjDm5sKdwZQSENVR+9HDTOyTkWaUKKmWbJgPCiuy2rZTr/OAeJfFU/2sTXGXM0eEBDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T12:13:23.325830Z"},"content_sha256":"93a2b7a2dc2f529829e23a5e016ae6d969e8d32b5bf18a7769811eeef964a480","schema_version":"1.0","event_id":"sha256:93a2b7a2dc2f529829e23a5e016ae6d969e8d32b5bf18a7769811eeef964a480"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/62MVA3VYT6GJKET37AJSMBL5ZF/bundle.json","state_url":"https://pith.science/pith/62MVA3VYT6GJKET37AJSMBL5ZF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/62MVA3VYT6GJKET37AJSMBL5ZF/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":"2026-06-10T12:13:23Z","links":{"resolver":"https://pith.science/pith/62MVA3VYT6GJKET37AJSMBL5ZF","bundle":"https://pith.science/pith/62MVA3VYT6GJKET37AJSMBL5ZF/bundle.json","state":"https://pith.science/pith/62MVA3VYT6GJKET37AJSMBL5ZF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/62MVA3VYT6GJKET37AJSMBL5ZF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:62MVA3VYT6GJKET37AJSMBL5ZF","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":"3879b3508655beab5b39f5dfcc7e4ca1c067602cea53e90c04b59463bfb004db","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-10T15:03:39Z","title_canon_sha256":"063f31eba8eb6f03ccf3f608c70c36a1a85f7e148761a17c21b588456f4323cc"},"schema_version":"1.0","source":{"id":"1204.2173","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.2173","created_at":"2026-05-18T01:57:54Z"},{"alias_kind":"arxiv_version","alias_value":"1204.2173v1","created_at":"2026-05-18T01:57:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.2173","created_at":"2026-05-18T01:57:54Z"},{"alias_kind":"pith_short_12","alias_value":"62MVA3VYT6GJ","created_at":"2026-05-18T12:26:56Z"},{"alias_kind":"pith_short_16","alias_value":"62MVA3VYT6GJKET3","created_at":"2026-05-18T12:26:56Z"},{"alias_kind":"pith_short_8","alias_value":"62MVA3VY","created_at":"2026-05-18T12:26:56Z"}],"graph_snapshots":[{"event_id":"sha256:93a2b7a2dc2f529829e23a5e016ae6d969e8d32b5bf18a7769811eeef964a480","target":"graph","created_at":"2026-05-18T01:57:54Z","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":"I present a review of X-ray and mid-IR surveys for Compton-thick Active Galactic Nuclei (AGN). These are the most highly obscured sources having hydrogen column densities >1.5x10^24 cm-2. Key surveys in the local Universe are presented including the high energy SWIFT/BAT and INTEGRAL surveys, mid-IR and also optical surveys. Recently, deep X-ray surveys with Chandra and XMM-Newton have produced a number of candidate Compton-thick AGN at higher redshift primarily in the Chandra Deep Field South region. In addition, mid-IR surveys with Spitzer have helped to develop novel complementary technique","authors_text":"I. Georgantopoulos (OABO/INAF)","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-10T15:03:39Z","title":"Recent developments in the search for Compton-thick AGN"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.2173","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":"sha256:50fdbe6fa25a431529196b92b8b4b5b43596799351eab6d9f67c8bc00d3c89e7","target":"record","created_at":"2026-05-18T01:57:54Z","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":"3879b3508655beab5b39f5dfcc7e4ca1c067602cea53e90c04b59463bfb004db","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-04-10T15:03:39Z","title_canon_sha256":"063f31eba8eb6f03ccf3f608c70c36a1a85f7e148761a17c21b588456f4323cc"},"schema_version":"1.0","source":{"id":"1204.2173","kind":"arxiv","version":1}},"canonical_sha256":"f699506eb89f8c95127bf81326057dc96f999b613a1c1878fc7597dfd89796b2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f699506eb89f8c95127bf81326057dc96f999b613a1c1878fc7597dfd89796b2","first_computed_at":"2026-05-18T01:57:54.010814Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:54.010814Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"t0b/EN1ZGOMh0acjh7CkvT7WvHpy5l7AbhLPT5hmPz2tTJtbYtN5F3YP24ea3+iN1kZDvY6RroC0nt3Du+rODg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:54.011341Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.2173","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:50fdbe6fa25a431529196b92b8b4b5b43596799351eab6d9f67c8bc00d3c89e7","sha256:93a2b7a2dc2f529829e23a5e016ae6d969e8d32b5bf18a7769811eeef964a480"],"state_sha256":"9a8707e34be62650e366971c0082f83ae4650048d6cb36d043d8d85a9e791451"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3garwlrRnfgGhvAa3Jbk4ArjTW/42dCgaEqSaqGH64LubqUusk31G6o/liS/hBtyULKG68rw4WX7n+kTMelODQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T12:13:23.329971Z","bundle_sha256":"03e28ab79a99f324c9ad15be66eae5b2ee22cc4b700e8ab1fb7d0a1781c6c524"}}