{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:V7QIWDEBXUHKMSOQ2BRZUB5QUG","short_pith_number":"pith:V7QIWDEB","canonical_record":{"source":{"id":"1803.10057","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-03-27T13:09:09Z","cross_cats_sorted":[],"title_canon_sha256":"9085677218500983e08fb95b4cd1e06e58e46969c2827e70db5c8ccbac8470de","abstract_canon_sha256":"74e8a8399e8dce355e14e5d6ac32991a0772b4fabe2f190457e11dd72fdee0df"},"schema_version":"1.0"},"canonical_sha256":"afe08b0c81bd0ea649d0d0639a07b0a189b34e0e9bf4ea7301239a93ebe8fc6c","source":{"kind":"arxiv","id":"1803.10057","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.10057","created_at":"2026-05-18T00:20:00Z"},{"alias_kind":"arxiv_version","alias_value":"1803.10057v1","created_at":"2026-05-18T00:20:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.10057","created_at":"2026-05-18T00:20:00Z"},{"alias_kind":"pith_short_12","alias_value":"V7QIWDEBXUHK","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"V7QIWDEBXUHKMSOQ","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"V7QIWDEB","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:V7QIWDEBXUHKMSOQ2BRZUB5QUG","target":"record","payload":{"canonical_record":{"source":{"id":"1803.10057","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-03-27T13:09:09Z","cross_cats_sorted":[],"title_canon_sha256":"9085677218500983e08fb95b4cd1e06e58e46969c2827e70db5c8ccbac8470de","abstract_canon_sha256":"74e8a8399e8dce355e14e5d6ac32991a0772b4fabe2f190457e11dd72fdee0df"},"schema_version":"1.0"},"canonical_sha256":"afe08b0c81bd0ea649d0d0639a07b0a189b34e0e9bf4ea7301239a93ebe8fc6c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:20:00.589760Z","signature_b64":"0cuOJJcxc2aY/6lG/Y1x/VwZobuWL56sLfyifx8PYbl2MyOjixWq0HXcigWEAuZ2SdECJHGZUcUaZ3MY1cgfDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"afe08b0c81bd0ea649d0d0639a07b0a189b34e0e9bf4ea7301239a93ebe8fc6c","last_reissued_at":"2026-05-18T00:20:00.589124Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:20:00.589124Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.10057","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":"2026-05-18T00:20:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z53W/6roOYJVCj/6W4vK1WeIpXGExuGT8Oyfle6idgfBv6QVwbIQK+sLjFn2q+sOwTe5IGG8cqM4ySNNwntzAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T15:09:57.089269Z"},"content_sha256":"8b03074850507a2edfcac39d588fdc2afc98cf5ba4426f44141e46f2b91cc4cf","schema_version":"1.0","event_id":"sha256:8b03074850507a2edfcac39d588fdc2afc98cf5ba4426f44141e46f2b91cc4cf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:V7QIWDEBXUHKMSOQ2BRZUB5QUG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Precision measurements on trapped antihydrogen in the ALPHA experiment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"S. Eriksson","submitted_at":"2018-03-27T13:09:09Z","abstract_excerpt":"Both the 1S-2S transition and the ground state hyperfine spectrum have been observed in trapped antihydrogen. The former constitutes the first observation of resonant interaction of light with an anti-atom, and the latter is the first detailed measurement of a spectral feature in antihydrogen. Due to the narrow intrinsic linewidth of the 1S-2S transition and use of two-photon laser excitation, the transition energy can be precisely determined in both hydrogen and antihydrogen, allowing a direct comparison as a test of fundamental symmetry. The result is consistent with CPT invariance at a rela"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10057","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":""},"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":"2026-05-18T00:20:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lBqv1xuYjzmkpwirNypxUI97W4UeqO5/u9r30UZvvYhLxuCMn1qcdX5KINxh5in4ZEWGqlJFzCbsgUjW4lLdBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T15:09:57.090031Z"},"content_sha256":"6bae3a07cf81a97a7839432fecbee3ee2929e63452b821b47f6ff1ab1ff50ece","schema_version":"1.0","event_id":"sha256:6bae3a07cf81a97a7839432fecbee3ee2929e63452b821b47f6ff1ab1ff50ece"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V7QIWDEBXUHKMSOQ2BRZUB5QUG/bundle.json","state_url":"https://pith.science/pith/V7QIWDEBXUHKMSOQ2BRZUB5QUG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V7QIWDEBXUHKMSOQ2BRZUB5QUG/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":"2026-06-11T15:09:57Z","links":{"resolver":"https://pith.science/pith/V7QIWDEBXUHKMSOQ2BRZUB5QUG","bundle":"https://pith.science/pith/V7QIWDEBXUHKMSOQ2BRZUB5QUG/bundle.json","state":"https://pith.science/pith/V7QIWDEBXUHKMSOQ2BRZUB5QUG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V7QIWDEBXUHKMSOQ2BRZUB5QUG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:V7QIWDEBXUHKMSOQ2BRZUB5QUG","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":"74e8a8399e8dce355e14e5d6ac32991a0772b4fabe2f190457e11dd72fdee0df","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-03-27T13:09:09Z","title_canon_sha256":"9085677218500983e08fb95b4cd1e06e58e46969c2827e70db5c8ccbac8470de"},"schema_version":"1.0","source":{"id":"1803.10057","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.10057","created_at":"2026-05-18T00:20:00Z"},{"alias_kind":"arxiv_version","alias_value":"1803.10057v1","created_at":"2026-05-18T00:20:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.10057","created_at":"2026-05-18T00:20:00Z"},{"alias_kind":"pith_short_12","alias_value":"V7QIWDEBXUHK","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"V7QIWDEBXUHKMSOQ","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"V7QIWDEB","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:6bae3a07cf81a97a7839432fecbee3ee2929e63452b821b47f6ff1ab1ff50ece","target":"graph","created_at":"2026-05-18T00:20:00Z","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"},"paper":{"abstract_excerpt":"Both the 1S-2S transition and the ground state hyperfine spectrum have been observed in trapped antihydrogen. The former constitutes the first observation of resonant interaction of light with an anti-atom, and the latter is the first detailed measurement of a spectral feature in antihydrogen. Due to the narrow intrinsic linewidth of the 1S-2S transition and use of two-photon laser excitation, the transition energy can be precisely determined in both hydrogen and antihydrogen, allowing a direct comparison as a test of fundamental symmetry. The result is consistent with CPT invariance at a rela","authors_text":"S. Eriksson","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-03-27T13:09:09Z","title":"Precision measurements on trapped antihydrogen in the ALPHA experiment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10057","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":"sha256:8b03074850507a2edfcac39d588fdc2afc98cf5ba4426f44141e46f2b91cc4cf","target":"record","created_at":"2026-05-18T00:20:00Z","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":"74e8a8399e8dce355e14e5d6ac32991a0772b4fabe2f190457e11dd72fdee0df","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-03-27T13:09:09Z","title_canon_sha256":"9085677218500983e08fb95b4cd1e06e58e46969c2827e70db5c8ccbac8470de"},"schema_version":"1.0","source":{"id":"1803.10057","kind":"arxiv","version":1}},"canonical_sha256":"afe08b0c81bd0ea649d0d0639a07b0a189b34e0e9bf4ea7301239a93ebe8fc6c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"afe08b0c81bd0ea649d0d0639a07b0a189b34e0e9bf4ea7301239a93ebe8fc6c","first_computed_at":"2026-05-18T00:20:00.589124Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:20:00.589124Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0cuOJJcxc2aY/6lG/Y1x/VwZobuWL56sLfyifx8PYbl2MyOjixWq0HXcigWEAuZ2SdECJHGZUcUaZ3MY1cgfDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:20:00.589760Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.10057","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8b03074850507a2edfcac39d588fdc2afc98cf5ba4426f44141e46f2b91cc4cf","sha256:6bae3a07cf81a97a7839432fecbee3ee2929e63452b821b47f6ff1ab1ff50ece"],"state_sha256":"6e00744991ffce788922b3428ceb5701400acf9dadcd9b312f52152bc657e72a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"echG8WIVXTDmQ7ggEs8MmIgdrN5mzy+8QicShmX9QpsWtrw7em7whP7MaoMObi5GVrj9yuyYf9EOQRQefEvBCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T15:09:57.094083Z","bundle_sha256":"896f651b1c93eceb5308206745db995e0b27d498f56c5e3018a34e88f15bddcd"}}