{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:AVB4YUPXKKWW7ML5NLJOIDKHED","short_pith_number":"pith:AVB4YUPX","canonical_record":{"source":{"id":"2506.12127","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-06-13T18:00:00Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"415142fc7833992034bfeba0e288e9287166ec5c160418fc7e1493dc5c63cdc3","abstract_canon_sha256":"4a87f51e59425bcd1ede10446a63717fb93ab6baa8c49bda2c2c53eb157b0c18"},"schema_version":"1.0"},"canonical_sha256":"0543cc51f752ad6fb17d6ad2e40d4720cbced7c5ef02ae07f589b2a353b2d52d","source":{"kind":"arxiv","id":"2506.12127","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.12127","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"arxiv_version","alias_value":"2506.12127v1","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.12127","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"pith_short_12","alias_value":"AVB4YUPXKKWW","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"pith_short_16","alias_value":"AVB4YUPXKKWW7ML5","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"pith_short_8","alias_value":"AVB4YUPX","created_at":"2026-07-05T11:21:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:AVB4YUPXKKWW7ML5NLJOIDKHED","target":"record","payload":{"canonical_record":{"source":{"id":"2506.12127","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-06-13T18:00:00Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"415142fc7833992034bfeba0e288e9287166ec5c160418fc7e1493dc5c63cdc3","abstract_canon_sha256":"4a87f51e59425bcd1ede10446a63717fb93ab6baa8c49bda2c2c53eb157b0c18"},"schema_version":"1.0"},"canonical_sha256":"0543cc51f752ad6fb17d6ad2e40d4720cbced7c5ef02ae07f589b2a353b2d52d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:21:21.590438Z","signature_b64":"x/rkXBMY5qXX9RiIRRAYUsr5JyCp1luC8Vpqd2ooqcu1idADmi4DNGJAOaYQcP5AyuMSGP2DMUF97uXU6Rk5Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0543cc51f752ad6fb17d6ad2e40d4720cbced7c5ef02ae07f589b2a353b2d52d","last_reissued_at":"2026-07-05T11:21:21.589928Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:21:21.589928Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2506.12127","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":"2026-07-05T11:21:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1YBR2JPVS2kberNdd0IwasriN/YLMTzZqSBerbxq73yb6H1NDJHThz9yX6bdtmu3vw9ldXnD/6fw6uJfe41CCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T21:00:21.979130Z"},"content_sha256":"f25aa2cd7f4ab61cea51b9c7d4f3ed06b8f45ab186da387f3017f8caf84fe8a2","schema_version":"1.0","event_id":"sha256:f25aa2cd7f4ab61cea51b9c7d4f3ed06b8f45ab186da387f3017f8caf84fe8a2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:AVB4YUPXKKWW7ML5NLJOIDKHED","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Algebras, Entanglement Islands, and Observers","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"hep-th","authors_text":"Hao Geng, Jiuci Xu, Yikun Jiang","submitted_at":"2025-06-13T18:00:00Z","abstract_excerpt":"Some recent work has postulated the existence of an \"observer\" for a consistent definition of subregion algebras in gravitational universes. The subregion algebras consist of operators dressed to this \"observer\" and are typically Type II von Neumann algebras. Nevertheless, as opposed to standard physical systems, such an \"observer\" was postulated to have a Hamiltonian $\\hat{H}_{\\text{obs}}$ linear in phase space variable. This linear form suggests that the complete dynamics of such an \"observer\" should also be controlled by an external system or some underlying degrees of freedom within the sy"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.12127","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/2506.12127/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":"2026-07-05T11:21:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TqJ9h9UOb2b20M5XJuIiu+Er7o4j1jrLdG9BofoLXkTJz7RKWZsPMTBJqhS60tVnWWWFl86Mdgojj3reYK8UBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T21:00:21.979642Z"},"content_sha256":"3d0b2da1d20ded2e712f967ed5139f17a448ef9e48754e69f87c1d0308b94545","schema_version":"1.0","event_id":"sha256:3d0b2da1d20ded2e712f967ed5139f17a448ef9e48754e69f87c1d0308b94545"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AVB4YUPXKKWW7ML5NLJOIDKHED/bundle.json","state_url":"https://pith.science/pith/AVB4YUPXKKWW7ML5NLJOIDKHED/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AVB4YUPXKKWW7ML5NLJOIDKHED/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":"2026-08-07T21:00:21Z","links":{"resolver":"https://pith.science/pith/AVB4YUPXKKWW7ML5NLJOIDKHED","bundle":"https://pith.science/pith/AVB4YUPXKKWW7ML5NLJOIDKHED/bundle.json","state":"https://pith.science/pith/AVB4YUPXKKWW7ML5NLJOIDKHED/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AVB4YUPXKKWW7ML5NLJOIDKHED/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:AVB4YUPXKKWW7ML5NLJOIDKHED","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":"4a87f51e59425bcd1ede10446a63717fb93ab6baa8c49bda2c2c53eb157b0c18","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-06-13T18:00:00Z","title_canon_sha256":"415142fc7833992034bfeba0e288e9287166ec5c160418fc7e1493dc5c63cdc3"},"schema_version":"1.0","source":{"id":"2506.12127","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.12127","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"arxiv_version","alias_value":"2506.12127v1","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.12127","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"pith_short_12","alias_value":"AVB4YUPXKKWW","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"pith_short_16","alias_value":"AVB4YUPXKKWW7ML5","created_at":"2026-07-05T11:21:21Z"},{"alias_kind":"pith_short_8","alias_value":"AVB4YUPX","created_at":"2026-07-05T11:21:21Z"}],"graph_snapshots":[{"event_id":"sha256:3d0b2da1d20ded2e712f967ed5139f17a448ef9e48754e69f87c1d0308b94545","target":"graph","created_at":"2026-07-05T11:21:21Z","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/2506.12127/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Some recent work has postulated the existence of an \"observer\" for a consistent definition of subregion algebras in gravitational universes. The subregion algebras consist of operators dressed to this \"observer\" and are typically Type II von Neumann algebras. Nevertheless, as opposed to standard physical systems, such an \"observer\" was postulated to have a Hamiltonian $\\hat{H}_{\\text{obs}}$ linear in phase space variable. This linear form suggests that the complete dynamics of such an \"observer\" should also be controlled by an external system or some underlying degrees of freedom within the sy","authors_text":"Hao Geng, Jiuci Xu, Yikun Jiang","cross_cats":["gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-06-13T18:00:00Z","title":"Algebras, Entanglement Islands, and Observers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.12127","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:f25aa2cd7f4ab61cea51b9c7d4f3ed06b8f45ab186da387f3017f8caf84fe8a2","target":"record","created_at":"2026-07-05T11:21:21Z","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":"4a87f51e59425bcd1ede10446a63717fb93ab6baa8c49bda2c2c53eb157b0c18","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-06-13T18:00:00Z","title_canon_sha256":"415142fc7833992034bfeba0e288e9287166ec5c160418fc7e1493dc5c63cdc3"},"schema_version":"1.0","source":{"id":"2506.12127","kind":"arxiv","version":1}},"canonical_sha256":"0543cc51f752ad6fb17d6ad2e40d4720cbced7c5ef02ae07f589b2a353b2d52d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0543cc51f752ad6fb17d6ad2e40d4720cbced7c5ef02ae07f589b2a353b2d52d","first_computed_at":"2026-07-05T11:21:21.589928Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:21:21.589928Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x/rkXBMY5qXX9RiIRRAYUsr5JyCp1luC8Vpqd2ooqcu1idADmi4DNGJAOaYQcP5AyuMSGP2DMUF97uXU6Rk5Cg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:21:21.590438Z","signed_message":"canonical_sha256_bytes"},"source_id":"2506.12127","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f25aa2cd7f4ab61cea51b9c7d4f3ed06b8f45ab186da387f3017f8caf84fe8a2","sha256:3d0b2da1d20ded2e712f967ed5139f17a448ef9e48754e69f87c1d0308b94545"],"state_sha256":"336197e30f79520eff8dd4034c1aa4ebec12efaea7df253178ded7b9fff0d06c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cHXAHKhiycK+Ls4KLPe7V3TefEA+Ff3xsaNJk/ESZUtkXm1VRRJlTqnQ71TNN1lpuWl0HV16qykJ68V7cmoaDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T21:00:21.983704Z","bundle_sha256":"f8ef6d503cae7dd462a5edd5851d1300f0b5fe668ad63fc5d299ab181505c9f8"}}