{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:RFEXMSNU7KXTM3KOX5POTXZYS2","short_pith_number":"pith:RFEXMSNU","canonical_record":{"source":{"id":"2109.02536","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-09-06T15:24:38Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"40b3dfc55f3707c4a2e7718066bba1675aa8c5ef330162ee5204bd179c50b8ff","abstract_canon_sha256":"7ad3af9f3c5d00b8179142c3b7453a743e1f8c859309eefc5c095b8e0e178810"},"schema_version":"1.0"},"canonical_sha256":"89497649b4faaf366d4ebf5ee9df3896a2ce3b71baddad18a36c6b15aad0f6a7","source":{"kind":"arxiv","id":"2109.02536","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.02536","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"arxiv_version","alias_value":"2109.02536v1","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.02536","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"pith_short_12","alias_value":"RFEXMSNU7KXT","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"pith_short_16","alias_value":"RFEXMSNU7KXTM3KO","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"pith_short_8","alias_value":"RFEXMSNU","created_at":"2026-07-05T04:20:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:RFEXMSNU7KXTM3KOX5POTXZYS2","target":"record","payload":{"canonical_record":{"source":{"id":"2109.02536","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-09-06T15:24:38Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"40b3dfc55f3707c4a2e7718066bba1675aa8c5ef330162ee5204bd179c50b8ff","abstract_canon_sha256":"7ad3af9f3c5d00b8179142c3b7453a743e1f8c859309eefc5c095b8e0e178810"},"schema_version":"1.0"},"canonical_sha256":"89497649b4faaf366d4ebf5ee9df3896a2ce3b71baddad18a36c6b15aad0f6a7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:20:15.922855Z","signature_b64":"+9rNU1xZ9qiGbqVyzqxu2tnfPE7Vcxn1qhJ3ocuF53rwK1z3NVm3x5RDWzJuwzIcHK7P7kjt6ppXiYld71OAAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"89497649b4faaf366d4ebf5ee9df3896a2ce3b71baddad18a36c6b15aad0f6a7","last_reissued_at":"2026-07-05T04:20:15.922450Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:20:15.922450Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.02536","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":"2026-07-05T04:20:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Mg+s1KDIPy6vLwODvtkkcctoALM/kQm14P+rE2sm/cW2BHlA/JTxCts6OT0v9KtGtRXj5ONPy9Ry4vTeFXLqBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-10T14:51:23.164669Z"},"content_sha256":"638b7612d20f4cd94611ce242a02af0e8e328b54afd85882a61ba03cc8573421","schema_version":"1.0","event_id":"sha256:638b7612d20f4cd94611ce242a02af0e8e328b54afd85882a61ba03cc8573421"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:RFEXMSNU7KXTM3KOX5POTXZYS2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Image In painting Applied to Art Completing Escher's Print Gallery","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.CV","authors_text":"Aditya Srinivas Menon, Gaston Mazzei, Lucia Cipolina-Kun, Simone Caenazzo","submitted_at":"2021-09-06T15:24:38Z","abstract_excerpt":"This extended abstract presents the first stages of a research on in-painting suited for art reconstruction. We introduce M.C Eschers Print Gallery lithography as a use case example. This artwork presents a void on its center and additionally, it follows a challenging mathematical structure that needs to be preserved by the in-painting method. We present our work so far and our future line of research."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.02536","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/2109.02536/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":"2026-07-05T04:20:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PJyGJU6DKcqB8bJw0bn/GdNisq/pVXqUbjCZb/8DabL21gGi+UAHpsFsNRrLsTXyFbABVfPmI/ILwudUffneAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-10T14:51:23.165079Z"},"content_sha256":"3fb2512115078056250980a49c4f12b46715ad1ed5ceb5c48898f048ddfe4d01","schema_version":"1.0","event_id":"sha256:3fb2512115078056250980a49c4f12b46715ad1ed5ceb5c48898f048ddfe4d01"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RFEXMSNU7KXTM3KOX5POTXZYS2/bundle.json","state_url":"https://pith.science/pith/RFEXMSNU7KXTM3KOX5POTXZYS2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RFEXMSNU7KXTM3KOX5POTXZYS2/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":"2026-07-10T14:51:23Z","links":{"resolver":"https://pith.science/pith/RFEXMSNU7KXTM3KOX5POTXZYS2","bundle":"https://pith.science/pith/RFEXMSNU7KXTM3KOX5POTXZYS2/bundle.json","state":"https://pith.science/pith/RFEXMSNU7KXTM3KOX5POTXZYS2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RFEXMSNU7KXTM3KOX5POTXZYS2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:RFEXMSNU7KXTM3KOX5POTXZYS2","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":"7ad3af9f3c5d00b8179142c3b7453a743e1f8c859309eefc5c095b8e0e178810","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-09-06T15:24:38Z","title_canon_sha256":"40b3dfc55f3707c4a2e7718066bba1675aa8c5ef330162ee5204bd179c50b8ff"},"schema_version":"1.0","source":{"id":"2109.02536","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.02536","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"arxiv_version","alias_value":"2109.02536v1","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.02536","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"pith_short_12","alias_value":"RFEXMSNU7KXT","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"pith_short_16","alias_value":"RFEXMSNU7KXTM3KO","created_at":"2026-07-05T04:20:15Z"},{"alias_kind":"pith_short_8","alias_value":"RFEXMSNU","created_at":"2026-07-05T04:20:15Z"}],"graph_snapshots":[{"event_id":"sha256:3fb2512115078056250980a49c4f12b46715ad1ed5ceb5c48898f048ddfe4d01","target":"graph","created_at":"2026-07-05T04:20:15Z","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/2109.02536/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This extended abstract presents the first stages of a research on in-painting suited for art reconstruction. We introduce M.C Eschers Print Gallery lithography as a use case example. This artwork presents a void on its center and additionally, it follows a challenging mathematical structure that needs to be preserved by the in-painting method. We present our work so far and our future line of research.","authors_text":"Aditya Srinivas Menon, Gaston Mazzei, Lucia Cipolina-Kun, Simone Caenazzo","cross_cats":["cs.AI"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-09-06T15:24:38Z","title":"Image In painting Applied to Art Completing Escher's Print Gallery"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.02536","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":"sha256:638b7612d20f4cd94611ce242a02af0e8e328b54afd85882a61ba03cc8573421","target":"record","created_at":"2026-07-05T04:20:15Z","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":"7ad3af9f3c5d00b8179142c3b7453a743e1f8c859309eefc5c095b8e0e178810","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-09-06T15:24:38Z","title_canon_sha256":"40b3dfc55f3707c4a2e7718066bba1675aa8c5ef330162ee5204bd179c50b8ff"},"schema_version":"1.0","source":{"id":"2109.02536","kind":"arxiv","version":1}},"canonical_sha256":"89497649b4faaf366d4ebf5ee9df3896a2ce3b71baddad18a36c6b15aad0f6a7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"89497649b4faaf366d4ebf5ee9df3896a2ce3b71baddad18a36c6b15aad0f6a7","first_computed_at":"2026-07-05T04:20:15.922450Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:20:15.922450Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+9rNU1xZ9qiGbqVyzqxu2tnfPE7Vcxn1qhJ3ocuF53rwK1z3NVm3x5RDWzJuwzIcHK7P7kjt6ppXiYld71OAAg==","signature_status":"signed_v1","signed_at":"2026-07-05T04:20:15.922855Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.02536","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:638b7612d20f4cd94611ce242a02af0e8e328b54afd85882a61ba03cc8573421","sha256:3fb2512115078056250980a49c4f12b46715ad1ed5ceb5c48898f048ddfe4d01"],"state_sha256":"a307525b985a89a49d95345eb9670f0b0ca842b09bd64de543b401e776dc71b0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Huyy9ONqwu6gxoON9wOpmQVdRW8TS5650GAsGCsiteSCoPy24X21qw3COzefLH0dTy1kLAHnUvF4qTEMgnrlBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-10T14:51:23.166997Z","bundle_sha256":"e1eb562eded06c8cee1ec7ed00c6879627db58c3031b1ff86318bb14ade342b2"}}