{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:YD4EPMZT4DW45PX4U4DYHPMJD4","short_pith_number":"pith:YD4EPMZT","canonical_record":{"source":{"id":"1904.12390","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-28T22:16:00Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"b1fca2c7af2b90ce3194a0b33bf6f7c048c5e6e64d399553420f603795ce8fa4","abstract_canon_sha256":"e7b137499c0ea039d519a68829948ef36eef1c8f833cac0ec46c4e8b07b428e0"},"schema_version":"1.0"},"canonical_sha256":"c0f847b333e0edcebefca70783bd891f00b13b52c1deee33bc1990c8f4d45fac","source":{"kind":"arxiv","id":"1904.12390","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.12390","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"arxiv_version","alias_value":"1904.12390v3","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.12390","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"pith_short_12","alias_value":"YD4EPMZT4DW4","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"pith_short_16","alias_value":"YD4EPMZT4DW45PX4","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"pith_short_8","alias_value":"YD4EPMZT","created_at":"2026-07-05T02:13:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:YD4EPMZT4DW45PX4U4DYHPMJD4","target":"record","payload":{"canonical_record":{"source":{"id":"1904.12390","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-28T22:16:00Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"b1fca2c7af2b90ce3194a0b33bf6f7c048c5e6e64d399553420f603795ce8fa4","abstract_canon_sha256":"e7b137499c0ea039d519a68829948ef36eef1c8f833cac0ec46c4e8b07b428e0"},"schema_version":"1.0"},"canonical_sha256":"c0f847b333e0edcebefca70783bd891f00b13b52c1deee33bc1990c8f4d45fac","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:13:10.453402Z","signature_b64":"Ff4h9U3RjpQmrgkR6TlZrwotPQ7+MBR2lBi4fgVS2RUglMfW00rjegcAHgoePqWb5iRMhHXuSIbAXvRCaQ9BDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c0f847b333e0edcebefca70783bd891f00b13b52c1deee33bc1990c8f4d45fac","last_reissued_at":"2026-07-05T02:13:10.453048Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:13:10.453048Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.12390","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:13:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WPxkx1jgt3Wo0NzCeWHycQqpZzWmoxbp7mV0uogHXGUJnlekOzzIVxG85Vxo1Ag2BWiy6OfawFayMfTHHTm+DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T16:34:39.583663Z"},"content_sha256":"b0d213cd1b994dc42d7448da9699d0152fc8586919ba258b2d628b24d741db17","schema_version":"1.0","event_id":"sha256:b0d213cd1b994dc42d7448da9699d0152fc8586919ba258b2d628b24d741db17"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:YD4EPMZT4DW45PX4U4DYHPMJD4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum clocks observe classical and quantum time dilation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"quant-ph","authors_text":"Alexander R. H. Smith, Mehdi Ahmadi","submitted_at":"2019-04-28T22:16:00Z","abstract_excerpt":"At the intersection of quantum theory and relativity lies the possibility of a clock experiencing a superposition of proper times. We consider quantum clocks constructed from the internal degrees of relativistic particles that move through curved spacetime. The probability that one clock reads a given proper time conditioned on another clock reading a different proper time is derived. From this conditional probability distribution, it is shown that when the center-of-mass of these clocks move in localized momentum wave packets they observe classical time dilation. We then illustrate a quantum "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.12390","kind":"arxiv","version":3},"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/1904.12390/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":"2026-07-05T02:13:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8+pq9ZapwMEwZcGOzA5xzgbHEoZ9OsV607iXoN3k/B4MdBnEbo4/vTjM7UVGOocSb/SuTEmMEkkFy4ekA65qCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T16:34:39.584577Z"},"content_sha256":"f3d213351062c4b70e6fe1920ff56a58ebc6bcdcd02de5bfdc89d56f827683ff","schema_version":"1.0","event_id":"sha256:f3d213351062c4b70e6fe1920ff56a58ebc6bcdcd02de5bfdc89d56f827683ff"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YD4EPMZT4DW45PX4U4DYHPMJD4/bundle.json","state_url":"https://pith.science/pith/YD4EPMZT4DW45PX4U4DYHPMJD4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YD4EPMZT4DW45PX4U4DYHPMJD4/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":"2026-08-09T16:34:39Z","links":{"resolver":"https://pith.science/pith/YD4EPMZT4DW45PX4U4DYHPMJD4","bundle":"https://pith.science/pith/YD4EPMZT4DW45PX4U4DYHPMJD4/bundle.json","state":"https://pith.science/pith/YD4EPMZT4DW45PX4U4DYHPMJD4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YD4EPMZT4DW45PX4U4DYHPMJD4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:YD4EPMZT4DW45PX4U4DYHPMJD4","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":"e7b137499c0ea039d519a68829948ef36eef1c8f833cac0ec46c4e8b07b428e0","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-28T22:16:00Z","title_canon_sha256":"b1fca2c7af2b90ce3194a0b33bf6f7c048c5e6e64d399553420f603795ce8fa4"},"schema_version":"1.0","source":{"id":"1904.12390","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.12390","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"arxiv_version","alias_value":"1904.12390v3","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.12390","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"pith_short_12","alias_value":"YD4EPMZT4DW4","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"pith_short_16","alias_value":"YD4EPMZT4DW45PX4","created_at":"2026-07-05T02:13:10Z"},{"alias_kind":"pith_short_8","alias_value":"YD4EPMZT","created_at":"2026-07-05T02:13:10Z"}],"graph_snapshots":[{"event_id":"sha256:f3d213351062c4b70e6fe1920ff56a58ebc6bcdcd02de5bfdc89d56f827683ff","target":"graph","created_at":"2026-07-05T02:13:10Z","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/1904.12390/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"At the intersection of quantum theory and relativity lies the possibility of a clock experiencing a superposition of proper times. We consider quantum clocks constructed from the internal degrees of relativistic particles that move through curved spacetime. The probability that one clock reads a given proper time conditioned on another clock reading a different proper time is derived. From this conditional probability distribution, it is shown that when the center-of-mass of these clocks move in localized momentum wave packets they observe classical time dilation. We then illustrate a quantum ","authors_text":"Alexander R. H. Smith, Mehdi Ahmadi","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-28T22:16:00Z","title":"Quantum clocks observe classical and quantum time dilation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.12390","kind":"arxiv","version":3},"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:b0d213cd1b994dc42d7448da9699d0152fc8586919ba258b2d628b24d741db17","target":"record","created_at":"2026-07-05T02:13:10Z","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":"e7b137499c0ea039d519a68829948ef36eef1c8f833cac0ec46c4e8b07b428e0","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-28T22:16:00Z","title_canon_sha256":"b1fca2c7af2b90ce3194a0b33bf6f7c048c5e6e64d399553420f603795ce8fa4"},"schema_version":"1.0","source":{"id":"1904.12390","kind":"arxiv","version":3}},"canonical_sha256":"c0f847b333e0edcebefca70783bd891f00b13b52c1deee33bc1990c8f4d45fac","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c0f847b333e0edcebefca70783bd891f00b13b52c1deee33bc1990c8f4d45fac","first_computed_at":"2026-07-05T02:13:10.453048Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:13:10.453048Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ff4h9U3RjpQmrgkR6TlZrwotPQ7+MBR2lBi4fgVS2RUglMfW00rjegcAHgoePqWb5iRMhHXuSIbAXvRCaQ9BDw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:13:10.453402Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.12390","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b0d213cd1b994dc42d7448da9699d0152fc8586919ba258b2d628b24d741db17","sha256:f3d213351062c4b70e6fe1920ff56a58ebc6bcdcd02de5bfdc89d56f827683ff"],"state_sha256":"86c38f7e573d383d4e0571618fc9cd0d1236f8ab652592b69a2af4171b847179"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U6ng3+Pdden3Cn85FtkONNemsFHOwV4U4gHvsfuyMYXUuMGUN5dh4402fuaxmZY6rywYjn3K3PupYXy9Bu9ECw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T16:34:39.591770Z","bundle_sha256":"8036c8d09872bbea124b81e63ee94499a21e422f341faacbbaab7d8e35ab924b"}}