{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:FKIX7ZVVPT3U22CIJ2ZPCIV4ZB","short_pith_number":"pith:FKIX7ZVV","canonical_record":{"source":{"id":"2302.13047","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-02-25T10:12:22Z","cross_cats_sorted":["hep-th","physics.hist-ph"],"title_canon_sha256":"2386e2af10386e37b3ebac813b4867059a3ddf55b9be1101bf643cd7200c318a","abstract_canon_sha256":"751b7797daaa0d7132963d570b2a15eb9c45385788063a4ed2e297e6a33bd7b7"},"schema_version":"1.0"},"canonical_sha256":"2a917fe6b57cf74d68484eb2f122bcc86371980559921776314d04f72db0ec5e","source":{"kind":"arxiv","id":"2302.13047","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2302.13047","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"arxiv_version","alias_value":"2302.13047v1","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2302.13047","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"pith_short_12","alias_value":"FKIX7ZVVPT3U","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"pith_short_16","alias_value":"FKIX7ZVVPT3U22CI","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"pith_short_8","alias_value":"FKIX7ZVV","created_at":"2026-07-05T05:45:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:FKIX7ZVVPT3U22CIJ2ZPCIV4ZB","target":"record","payload":{"canonical_record":{"source":{"id":"2302.13047","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-02-25T10:12:22Z","cross_cats_sorted":["hep-th","physics.hist-ph"],"title_canon_sha256":"2386e2af10386e37b3ebac813b4867059a3ddf55b9be1101bf643cd7200c318a","abstract_canon_sha256":"751b7797daaa0d7132963d570b2a15eb9c45385788063a4ed2e297e6a33bd7b7"},"schema_version":"1.0"},"canonical_sha256":"2a917fe6b57cf74d68484eb2f122bcc86371980559921776314d04f72db0ec5e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:45:42.691748Z","signature_b64":"CdS475UI3rii7BhslBCVgVaNZ07WkUSjviMb5D9MtPoSDCSiXStq9yrJNI0Va6Z2/VjeSwa3XRZh4Td6ENhmAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2a917fe6b57cf74d68484eb2f122bcc86371980559921776314d04f72db0ec5e","last_reissued_at":"2026-07-05T05:45:42.691295Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:45:42.691295Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2302.13047","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":"2026-07-05T05:45:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cWCxQmBIqSn3uB7gHASGxJt9EZkgBcewPsj+zlzdJec+lwb3Qpk/DZt+bcOunYdCah3p4YzTq6xkohkBLkI/Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T13:17:35.637665Z"},"content_sha256":"f69f36e8bf9739009338f34e87042b56667e845430584b45e4aaeeeff98695c1","schema_version":"1.0","event_id":"sha256:f69f36e8bf9739009338f34e87042b56667e845430584b45e4aaeeeff98695c1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:FKIX7ZVVPT3U22CIJ2ZPCIV4ZB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum gravity -- an unfinished revolution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th","physics.hist-ph"],"primary_cat":"gr-qc","authors_text":"Claus Kiefer","submitted_at":"2023-02-25T10:12:22Z","abstract_excerpt":"It is generally assumed that the search for a consistent and testable theory of quantum gravity is among the most important open problems of fundamental physics. I review the motivations for this search, the main problems on the way, and the status of present approaches and their physical relevance. I speculate on what the situation could be in 2050."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2302.13047","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/2302.13047/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":"2026-07-05T05:45:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bi5Z0KF0Tnu5j7iVSjUiybL2wsii0QAIAd9UtqhwlAanWyEWy7LCWrbPtcNL5QX6h7PYqrw71May21Ak2TjaBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T13:17:35.638164Z"},"content_sha256":"6406d323715f90214d2e69f7cf7932d0c3ec7e0d0244174a77b3cb086ae1d0ad","schema_version":"1.0","event_id":"sha256:6406d323715f90214d2e69f7cf7932d0c3ec7e0d0244174a77b3cb086ae1d0ad"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FKIX7ZVVPT3U22CIJ2ZPCIV4ZB/bundle.json","state_url":"https://pith.science/pith/FKIX7ZVVPT3U22CIJ2ZPCIV4ZB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FKIX7ZVVPT3U22CIJ2ZPCIV4ZB/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":"2026-08-10T13:17:35Z","links":{"resolver":"https://pith.science/pith/FKIX7ZVVPT3U22CIJ2ZPCIV4ZB","bundle":"https://pith.science/pith/FKIX7ZVVPT3U22CIJ2ZPCIV4ZB/bundle.json","state":"https://pith.science/pith/FKIX7ZVVPT3U22CIJ2ZPCIV4ZB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FKIX7ZVVPT3U22CIJ2ZPCIV4ZB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:FKIX7ZVVPT3U22CIJ2ZPCIV4ZB","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":"751b7797daaa0d7132963d570b2a15eb9c45385788063a4ed2e297e6a33bd7b7","cross_cats_sorted":["hep-th","physics.hist-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-02-25T10:12:22Z","title_canon_sha256":"2386e2af10386e37b3ebac813b4867059a3ddf55b9be1101bf643cd7200c318a"},"schema_version":"1.0","source":{"id":"2302.13047","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2302.13047","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"arxiv_version","alias_value":"2302.13047v1","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2302.13047","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"pith_short_12","alias_value":"FKIX7ZVVPT3U","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"pith_short_16","alias_value":"FKIX7ZVVPT3U22CI","created_at":"2026-07-05T05:45:42Z"},{"alias_kind":"pith_short_8","alias_value":"FKIX7ZVV","created_at":"2026-07-05T05:45:42Z"}],"graph_snapshots":[{"event_id":"sha256:6406d323715f90214d2e69f7cf7932d0c3ec7e0d0244174a77b3cb086ae1d0ad","target":"graph","created_at":"2026-07-05T05:45:42Z","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/2302.13047/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"It is generally assumed that the search for a consistent and testable theory of quantum gravity is among the most important open problems of fundamental physics. I review the motivations for this search, the main problems on the way, and the status of present approaches and their physical relevance. I speculate on what the situation could be in 2050.","authors_text":"Claus Kiefer","cross_cats":["hep-th","physics.hist-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-02-25T10:12:22Z","title":"Quantum gravity -- an unfinished revolution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2302.13047","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:f69f36e8bf9739009338f34e87042b56667e845430584b45e4aaeeeff98695c1","target":"record","created_at":"2026-07-05T05:45:42Z","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":"751b7797daaa0d7132963d570b2a15eb9c45385788063a4ed2e297e6a33bd7b7","cross_cats_sorted":["hep-th","physics.hist-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2023-02-25T10:12:22Z","title_canon_sha256":"2386e2af10386e37b3ebac813b4867059a3ddf55b9be1101bf643cd7200c318a"},"schema_version":"1.0","source":{"id":"2302.13047","kind":"arxiv","version":1}},"canonical_sha256":"2a917fe6b57cf74d68484eb2f122bcc86371980559921776314d04f72db0ec5e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2a917fe6b57cf74d68484eb2f122bcc86371980559921776314d04f72db0ec5e","first_computed_at":"2026-07-05T05:45:42.691295Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:45:42.691295Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CdS475UI3rii7BhslBCVgVaNZ07WkUSjviMb5D9MtPoSDCSiXStq9yrJNI0Va6Z2/VjeSwa3XRZh4Td6ENhmAg==","signature_status":"signed_v1","signed_at":"2026-07-05T05:45:42.691748Z","signed_message":"canonical_sha256_bytes"},"source_id":"2302.13047","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f69f36e8bf9739009338f34e87042b56667e845430584b45e4aaeeeff98695c1","sha256:6406d323715f90214d2e69f7cf7932d0c3ec7e0d0244174a77b3cb086ae1d0ad"],"state_sha256":"07b6dd6312378bd7dbcc10f0943d388cf6a8cf003af4626f1678c767245e6539"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VID+vFOpVVYYO/H7NCETwh1BUr5W+eYvdrEsyI01/CDWsBGCXoEF52F3mXoOKwIccYiYQcSZ0ZsYfnwbE3kHCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T13:17:35.641742Z","bundle_sha256":"2eb8e152e251eed145053a3486fca42c5e96c6bf9ced6330eef8609856658be3"}}