{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:FK233F5QUMEJZX52JZNFFGBIL7","short_pith_number":"pith:FK233F5Q","canonical_record":{"source":{"id":"1502.05314","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-02-18T17:47:26Z","cross_cats_sorted":["physics.atom-ph"],"title_canon_sha256":"959b888a2c6e76e420ddfcbccddc7954d8d4cb7b855f6037188fcaf2d3e50f59","abstract_canon_sha256":"be02a3d60637316dc0c05b2e1f6665d742408a433c264ed36fe18a536144c692"},"schema_version":"1.0"},"canonical_sha256":"2ab5bd97b0a3089cdfba4e5a5298285fe4a4aad255018b4ade540e32889368f1","source":{"kind":"arxiv","id":"1502.05314","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05314","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05314v1","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05314","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"pith_short_12","alias_value":"FK233F5QUMEJ","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"FK233F5QUMEJZX52","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"FK233F5Q","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:FK233F5QUMEJZX52JZNFFGBIL7","target":"record","payload":{"canonical_record":{"source":{"id":"1502.05314","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-02-18T17:47:26Z","cross_cats_sorted":["physics.atom-ph"],"title_canon_sha256":"959b888a2c6e76e420ddfcbccddc7954d8d4cb7b855f6037188fcaf2d3e50f59","abstract_canon_sha256":"be02a3d60637316dc0c05b2e1f6665d742408a433c264ed36fe18a536144c692"},"schema_version":"1.0"},"canonical_sha256":"2ab5bd97b0a3089cdfba4e5a5298285fe4a4aad255018b4ade540e32889368f1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:06.616104Z","signature_b64":"v4TJe1QldbcHYgXL+fnhh/z1x7WiaB8Q+FNYw0s2Z3QNEI3iMwSzVKRauPDX+kWLjZuBRdE4/HQISmwxid0EAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2ab5bd97b0a3089cdfba4e5a5298285fe4a4aad255018b4ade540e32889368f1","last_reissued_at":"2026-05-18T02:04:06.615301Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:06.615301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.05314","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":"2026-05-18T02:04:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v7TXGcUZ+yvpqtu1vtm/rwUtZjwkxJSddBYtvUnnvMNMnZ/db4XZy/oHIl+gtMdr6svVMnXybYLEoJ1Wl+VwCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T01:55:10.749778Z"},"content_sha256":"29387b1bf250969692d3e132ae9f042d91cb201f9677486fa2d862dde6d2ccc7","schema_version":"1.0","event_id":"sha256:29387b1bf250969692d3e132ae9f042d91cb201f9677486fa2d862dde6d2ccc7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:FK233F5QUMEJZX52JZNFFGBIL7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Proton Radius Puzzle","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph"],"primary_cat":"hep-ph","authors_text":"Carl E. Carlson (William & Mary)","submitted_at":"2015-02-18T17:47:26Z","abstract_excerpt":"The proton size, specifically its charge radius, was thought known to about 1% accuracy. Now a new method probing the proton with muons instead of electrons finds a radius about 4% smaller, and to boot gives an uncertainty limit of about 0.1%. We review the different measurements, some of the calculations that underlie them, some of the suggestions that have been made to resolve the conflict, and give a brief overview new related experimental initiatives. At present, however, the resolution to the problem remains unknown."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05314","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":"2026-05-18T02:04:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Zi1uXTiY6CNN/1OGFhufTMJxYnU6IYbpydGWhrQIYihE0mMJE1DTU3/29fR48w0ykhJArJtTJZxj5mwHgQw9Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T01:55:10.750129Z"},"content_sha256":"ff2db488eed384cc3fda243d501adaf2aa95d53e9aa2c660a4f6c4bf3c1c9caa","schema_version":"1.0","event_id":"sha256:ff2db488eed384cc3fda243d501adaf2aa95d53e9aa2c660a4f6c4bf3c1c9caa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FK233F5QUMEJZX52JZNFFGBIL7/bundle.json","state_url":"https://pith.science/pith/FK233F5QUMEJZX52JZNFFGBIL7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FK233F5QUMEJZX52JZNFFGBIL7/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":"2026-06-28T01:55:10Z","links":{"resolver":"https://pith.science/pith/FK233F5QUMEJZX52JZNFFGBIL7","bundle":"https://pith.science/pith/FK233F5QUMEJZX52JZNFFGBIL7/bundle.json","state":"https://pith.science/pith/FK233F5QUMEJZX52JZNFFGBIL7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FK233F5QUMEJZX52JZNFFGBIL7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:FK233F5QUMEJZX52JZNFFGBIL7","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":"be02a3d60637316dc0c05b2e1f6665d742408a433c264ed36fe18a536144c692","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-02-18T17:47:26Z","title_canon_sha256":"959b888a2c6e76e420ddfcbccddc7954d8d4cb7b855f6037188fcaf2d3e50f59"},"schema_version":"1.0","source":{"id":"1502.05314","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05314","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05314v1","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05314","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"pith_short_12","alias_value":"FK233F5QUMEJ","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"FK233F5QUMEJZX52","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"FK233F5Q","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:ff2db488eed384cc3fda243d501adaf2aa95d53e9aa2c660a4f6c4bf3c1c9caa","target":"graph","created_at":"2026-05-18T02:04:06Z","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":"The proton size, specifically its charge radius, was thought known to about 1% accuracy. Now a new method probing the proton with muons instead of electrons finds a radius about 4% smaller, and to boot gives an uncertainty limit of about 0.1%. We review the different measurements, some of the calculations that underlie them, some of the suggestions that have been made to resolve the conflict, and give a brief overview new related experimental initiatives. At present, however, the resolution to the problem remains unknown.","authors_text":"Carl E. Carlson (William & Mary)","cross_cats":["physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-02-18T17:47:26Z","title":"The Proton Radius Puzzle"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05314","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":"sha256:29387b1bf250969692d3e132ae9f042d91cb201f9677486fa2d862dde6d2ccc7","target":"record","created_at":"2026-05-18T02:04:06Z","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":"be02a3d60637316dc0c05b2e1f6665d742408a433c264ed36fe18a536144c692","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-02-18T17:47:26Z","title_canon_sha256":"959b888a2c6e76e420ddfcbccddc7954d8d4cb7b855f6037188fcaf2d3e50f59"},"schema_version":"1.0","source":{"id":"1502.05314","kind":"arxiv","version":1}},"canonical_sha256":"2ab5bd97b0a3089cdfba4e5a5298285fe4a4aad255018b4ade540e32889368f1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2ab5bd97b0a3089cdfba4e5a5298285fe4a4aad255018b4ade540e32889368f1","first_computed_at":"2026-05-18T02:04:06.615301Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:06.615301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"v4TJe1QldbcHYgXL+fnhh/z1x7WiaB8Q+FNYw0s2Z3QNEI3iMwSzVKRauPDX+kWLjZuBRdE4/HQISmwxid0EAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:06.616104Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.05314","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:29387b1bf250969692d3e132ae9f042d91cb201f9677486fa2d862dde6d2ccc7","sha256:ff2db488eed384cc3fda243d501adaf2aa95d53e9aa2c660a4f6c4bf3c1c9caa"],"state_sha256":"7e9018729f63652d13246a0b7e7f04ba50d38bc818919a5c00b8d4523d32b553"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cugzDwgPXKl1J8HtX8RSsnH1NnYDCHAcX1LCqNqUshtc8uMhcSDWMLVTzuTqu2schnX1OoBH8UnMEJD8nS1CCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T01:55:10.752614Z","bundle_sha256":"2fe744f9e5e4bde1ddb99f8a4368446ba830ed23ff40008afecc4a7203740972"}}