{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:5Y5BAOQTTB5GLUTF2LPQVXLM6A","short_pith_number":"pith:5Y5BAOQT","canonical_record":{"source":{"id":"astro-ph/0307493","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-07-29T08:11:44Z","cross_cats_sorted":[],"title_canon_sha256":"43e7bf786dc419f5b7239d00c3055c1240a34e797a09ec2e09b0f1b588ee0814","abstract_canon_sha256":"c20a5269d324d8d97cbbb6c68fd67c47c7abb246212fffdedfd277c572e510c3"},"schema_version":"1.0"},"canonical_sha256":"ee3a103a13987a65d265d2df0add6cf013430cae0e3b008997e183a5736d54d2","source":{"kind":"arxiv","id":"astro-ph/0307493","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0307493","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0307493v1","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0307493","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"pith_short_12","alias_value":"5Y5BAOQTTB5G","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"pith_short_16","alias_value":"5Y5BAOQTTB5GLUTF","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"pith_short_8","alias_value":"5Y5BAOQT","created_at":"2026-07-04T16:51:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:5Y5BAOQTTB5GLUTF2LPQVXLM6A","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0307493","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-07-29T08:11:44Z","cross_cats_sorted":[],"title_canon_sha256":"43e7bf786dc419f5b7239d00c3055c1240a34e797a09ec2e09b0f1b588ee0814","abstract_canon_sha256":"c20a5269d324d8d97cbbb6c68fd67c47c7abb246212fffdedfd277c572e510c3"},"schema_version":"1.0"},"canonical_sha256":"ee3a103a13987a65d265d2df0add6cf013430cae0e3b008997e183a5736d54d2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:51:22.166574Z","signature_b64":"mJYnvmB3M7J4Xlcqx6khonzgZOz7SETSRRFYPD4pUgdozt3eWnrD2ypm1+Fvh7INVNW7O56EqCbX+3PFcxFLCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ee3a103a13987a65d265d2df0add6cf013430cae0e3b008997e183a5736d54d2","last_reissued_at":"2026-07-04T16:51:22.166178Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:51:22.166178Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0307493","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":"2026-07-04T16:51:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3kecounFOhzXQCjwVDS5AAQNsxxiLTY3U4Bpq6mzb95r/bgudwwuMenYmP1Xw5hllBJJKr0USNvgpRip1tViAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:38:34.936748Z"},"content_sha256":"3d86170638750c9ca3088933465f1e7dfe4e8b80f8ad1df1409f5b2e68eb6adf","schema_version":"1.0","event_id":"sha256:3d86170638750c9ca3088933465f1e7dfe4e8b80f8ad1df1409f5b2e68eb6adf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:5Y5BAOQTTB5GLUTF2LPQVXLM6A","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The galactic center black hole as a possible retro-lens for the S2 orbiting star","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.A. Nucita, A. Geralico, F. De Paolis, G. Ingrosso","submitted_at":"2003-07-29T08:11:44Z","abstract_excerpt":"Holz & Wheeler (\\cite{hw}) have recently proposed that a Schwarzschild black hole may act as a retro-lens which, if illuminated by a powerful light source, deflects light ray paths to large bending angles and a series of luminous arcs (or rings in the case of aligned objects) centered on the black hole may form. Obviously, the most convenient geometry to get retro-lensing images would be that of a very bright star close to a massive black hole, say the putative $\\sim 4\\times 10^6$ M$_{\\odot}$ black hole at the galactic center. Recent observations of the galactic center region in the $K$-band h"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0307493","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0307493/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T16:51:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Mqm+MZcaB4uYtZjlRri4JwLqKe98jYuANr5BOJE0j87c1awW/bBzsH6oOXSqJHh2Hvy8/WcpW0EIbdwMCS6MBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:38:34.937413Z"},"content_sha256":"1b03d9854d8517452b41cdea212a90a66e813ba79fcf58260c83e0b6c1f6b9fd","schema_version":"1.0","event_id":"sha256:1b03d9854d8517452b41cdea212a90a66e813ba79fcf58260c83e0b6c1f6b9fd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5Y5BAOQTTB5GLUTF2LPQVXLM6A/bundle.json","state_url":"https://pith.science/pith/5Y5BAOQTTB5GLUTF2LPQVXLM6A/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5Y5BAOQTTB5GLUTF2LPQVXLM6A/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":"2026-07-05T15:38:34Z","links":{"resolver":"https://pith.science/pith/5Y5BAOQTTB5GLUTF2LPQVXLM6A","bundle":"https://pith.science/pith/5Y5BAOQTTB5GLUTF2LPQVXLM6A/bundle.json","state":"https://pith.science/pith/5Y5BAOQTTB5GLUTF2LPQVXLM6A/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5Y5BAOQTTB5GLUTF2LPQVXLM6A/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:5Y5BAOQTTB5GLUTF2LPQVXLM6A","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":"c20a5269d324d8d97cbbb6c68fd67c47c7abb246212fffdedfd277c572e510c3","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-07-29T08:11:44Z","title_canon_sha256":"43e7bf786dc419f5b7239d00c3055c1240a34e797a09ec2e09b0f1b588ee0814"},"schema_version":"1.0","source":{"id":"astro-ph/0307493","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0307493","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0307493v1","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0307493","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"pith_short_12","alias_value":"5Y5BAOQTTB5G","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"pith_short_16","alias_value":"5Y5BAOQTTB5GLUTF","created_at":"2026-07-04T16:51:22Z"},{"alias_kind":"pith_short_8","alias_value":"5Y5BAOQT","created_at":"2026-07-04T16:51:22Z"}],"graph_snapshots":[{"event_id":"sha256:1b03d9854d8517452b41cdea212a90a66e813ba79fcf58260c83e0b6c1f6b9fd","target":"graph","created_at":"2026-07-04T16:51:22Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/0307493/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Holz & Wheeler (\\cite{hw}) have recently proposed that a Schwarzschild black hole may act as a retro-lens which, if illuminated by a powerful light source, deflects light ray paths to large bending angles and a series of luminous arcs (or rings in the case of aligned objects) centered on the black hole may form. Obviously, the most convenient geometry to get retro-lensing images would be that of a very bright star close to a massive black hole, say the putative $\\sim 4\\times 10^6$ M$_{\\odot}$ black hole at the galactic center. Recent observations of the galactic center region in the $K$-band h","authors_text":"A.A. Nucita, A. Geralico, F. De Paolis, G. Ingrosso","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-07-29T08:11:44Z","title":"The galactic center black hole as a possible retro-lens for the S2 orbiting star"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0307493","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":"sha256:3d86170638750c9ca3088933465f1e7dfe4e8b80f8ad1df1409f5b2e68eb6adf","target":"record","created_at":"2026-07-04T16:51:22Z","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":"c20a5269d324d8d97cbbb6c68fd67c47c7abb246212fffdedfd277c572e510c3","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-07-29T08:11:44Z","title_canon_sha256":"43e7bf786dc419f5b7239d00c3055c1240a34e797a09ec2e09b0f1b588ee0814"},"schema_version":"1.0","source":{"id":"astro-ph/0307493","kind":"arxiv","version":1}},"canonical_sha256":"ee3a103a13987a65d265d2df0add6cf013430cae0e3b008997e183a5736d54d2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ee3a103a13987a65d265d2df0add6cf013430cae0e3b008997e183a5736d54d2","first_computed_at":"2026-07-04T16:51:22.166178Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:51:22.166178Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mJYnvmB3M7J4Xlcqx6khonzgZOz7SETSRRFYPD4pUgdozt3eWnrD2ypm1+Fvh7INVNW7O56EqCbX+3PFcxFLCw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:51:22.166574Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0307493","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3d86170638750c9ca3088933465f1e7dfe4e8b80f8ad1df1409f5b2e68eb6adf","sha256:1b03d9854d8517452b41cdea212a90a66e813ba79fcf58260c83e0b6c1f6b9fd"],"state_sha256":"271be22c8a6135cf889783944c06d793b7e0dee06f83226d4cd392f0e90c403d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fJIVfl0uwevo81eGyeXjvmgKBDpwI3TaXsKoZ6lqbkI9isJVh2d0bCn4GftPcyK0McYeqtkC+TCPjoKDk6WrDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T15:38:34.940920Z","bundle_sha256":"6cb4d05a60fa41f8c4138b61a82f055c91c85d883acc2111abb7fe2feb3878d5"}}