{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:MA22GZWEKFBWUFAQHSIDQ2WNZK","short_pith_number":"pith:MA22GZWE","canonical_record":{"source":{"id":"1402.2571","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-02-11T17:36:46Z","cross_cats_sorted":[],"title_canon_sha256":"de33e511a1afb02fb3797fa58a7037ef7851cb36e46ea1508e87c9269bfa603c","abstract_canon_sha256":"94649669c98c32cb910edc3eacd379c72424a33661bfadc80795cb19a49b1f3d"},"schema_version":"1.0"},"canonical_sha256":"6035a366c451436a14103c90386acdcab03899c49bc3dab975753b61272b4d23","source":{"kind":"arxiv","id":"1402.2571","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.2571","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"arxiv_version","alias_value":"1402.2571v1","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.2571","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"pith_short_12","alias_value":"MA22GZWEKFBW","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"MA22GZWEKFBWUFAQ","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"MA22GZWE","created_at":"2026-05-18T12:28:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:MA22GZWEKFBWUFAQHSIDQ2WNZK","target":"record","payload":{"canonical_record":{"source":{"id":"1402.2571","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-02-11T17:36:46Z","cross_cats_sorted":[],"title_canon_sha256":"de33e511a1afb02fb3797fa58a7037ef7851cb36e46ea1508e87c9269bfa603c","abstract_canon_sha256":"94649669c98c32cb910edc3eacd379c72424a33661bfadc80795cb19a49b1f3d"},"schema_version":"1.0"},"canonical_sha256":"6035a366c451436a14103c90386acdcab03899c49bc3dab975753b61272b4d23","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:57:07.202179Z","signature_b64":"1UFd0aEFMwk2a7iz4CPFtzLVfdNq9kwAjxr8WCA9b6b0TzaCS7x7t2tY07JCVzjQEls5C/J/AZyLOEr8ORsDAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6035a366c451436a14103c90386acdcab03899c49bc3dab975753b61272b4d23","last_reissued_at":"2026-05-18T02:57:07.201588Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:57:07.201588Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1402.2571","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":"2026-05-18T02:57:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UOpceK4UpYweShnU4dCT2oZPVnAa3v8tOFYuenqI9Eqjmu2HabuIsHPAqOp3bdW7NW8vAjqM1DKoZokZS/ohBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:40:13.602158Z"},"content_sha256":"966b813e5576f03957a950f014608f83c27d960f35831b535a7f4ba4a9c251a3","schema_version":"1.0","event_id":"sha256:966b813e5576f03957a950f014608f83c27d960f35831b535a7f4ba4a9c251a3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:MA22GZWEKFBWUFAQHSIDQ2WNZK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical phase coherent timing of the Crab nebula pulsar with Iqueye at the ESO New Technology Telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. \\v{C}ade\\v{z}, C. Barbieri, E. Verroi, G. Naletto, L. Zampieri, M. Barbieri, M. Calvani, P. Zoccarato, T. Occhipinti","submitted_at":"2014-02-11T17:36:46Z","abstract_excerpt":"The Crab nebula pulsar was observed in 2009 January and December with a novel very fast optical photon counter, Iqueye, mounted at the ESO 3.5 m New Technology Telescope. Thanks to the exquisite quality of the Iqueye data, we computed accurate phase coherent timing solutions for the two observing runs and over the entire year 2009. Our statistical uncertainty on the determination of the phase of the main pulse and the rotational period of the pulsar for short (a few days) time intervals are $\\approx 1 \\, \\mu$s and ~0.5 ps, respectively. Comparison with the Jodrell Bank radio ephemerides shows "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.2571","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":"2026-05-18T02:57:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+c0ye6Uz1N85b0BGCPHVrrI6NWUNFaJN6rrSk0AungXCIdHEnSH/LH4b91VSUO69FRFb1KefQOhGI1jLmYzOBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:40:13.602875Z"},"content_sha256":"3cac1a49da9bd39a204067532a184d05b25384c9e22c949dc8a48eb372a2229a","schema_version":"1.0","event_id":"sha256:3cac1a49da9bd39a204067532a184d05b25384c9e22c949dc8a48eb372a2229a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MA22GZWEKFBWUFAQHSIDQ2WNZK/bundle.json","state_url":"https://pith.science/pith/MA22GZWEKFBWUFAQHSIDQ2WNZK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MA22GZWEKFBWUFAQHSIDQ2WNZK/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":"2026-05-25T18:40:13Z","links":{"resolver":"https://pith.science/pith/MA22GZWEKFBWUFAQHSIDQ2WNZK","bundle":"https://pith.science/pith/MA22GZWEKFBWUFAQHSIDQ2WNZK/bundle.json","state":"https://pith.science/pith/MA22GZWEKFBWUFAQHSIDQ2WNZK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MA22GZWEKFBWUFAQHSIDQ2WNZK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:MA22GZWEKFBWUFAQHSIDQ2WNZK","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":"94649669c98c32cb910edc3eacd379c72424a33661bfadc80795cb19a49b1f3d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-02-11T17:36:46Z","title_canon_sha256":"de33e511a1afb02fb3797fa58a7037ef7851cb36e46ea1508e87c9269bfa603c"},"schema_version":"1.0","source":{"id":"1402.2571","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.2571","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"arxiv_version","alias_value":"1402.2571v1","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.2571","created_at":"2026-05-18T02:57:07Z"},{"alias_kind":"pith_short_12","alias_value":"MA22GZWEKFBW","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"MA22GZWEKFBWUFAQ","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"MA22GZWE","created_at":"2026-05-18T12:28:38Z"}],"graph_snapshots":[{"event_id":"sha256:3cac1a49da9bd39a204067532a184d05b25384c9e22c949dc8a48eb372a2229a","target":"graph","created_at":"2026-05-18T02:57:07Z","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 Crab nebula pulsar was observed in 2009 January and December with a novel very fast optical photon counter, Iqueye, mounted at the ESO 3.5 m New Technology Telescope. Thanks to the exquisite quality of the Iqueye data, we computed accurate phase coherent timing solutions for the two observing runs and over the entire year 2009. Our statistical uncertainty on the determination of the phase of the main pulse and the rotational period of the pulsar for short (a few days) time intervals are $\\approx 1 \\, \\mu$s and ~0.5 ps, respectively. Comparison with the Jodrell Bank radio ephemerides shows ","authors_text":"A. \\v{C}ade\\v{z}, C. Barbieri, E. Verroi, G. Naletto, L. Zampieri, M. Barbieri, M. Calvani, P. Zoccarato, T. Occhipinti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-02-11T17:36:46Z","title":"Optical phase coherent timing of the Crab nebula pulsar with Iqueye at the ESO New Technology Telescope"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.2571","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":"sha256:966b813e5576f03957a950f014608f83c27d960f35831b535a7f4ba4a9c251a3","target":"record","created_at":"2026-05-18T02:57:07Z","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":"94649669c98c32cb910edc3eacd379c72424a33661bfadc80795cb19a49b1f3d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-02-11T17:36:46Z","title_canon_sha256":"de33e511a1afb02fb3797fa58a7037ef7851cb36e46ea1508e87c9269bfa603c"},"schema_version":"1.0","source":{"id":"1402.2571","kind":"arxiv","version":1}},"canonical_sha256":"6035a366c451436a14103c90386acdcab03899c49bc3dab975753b61272b4d23","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6035a366c451436a14103c90386acdcab03899c49bc3dab975753b61272b4d23","first_computed_at":"2026-05-18T02:57:07.201588Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:57:07.201588Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1UFd0aEFMwk2a7iz4CPFtzLVfdNq9kwAjxr8WCA9b6b0TzaCS7x7t2tY07JCVzjQEls5C/J/AZyLOEr8ORsDAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:57:07.202179Z","signed_message":"canonical_sha256_bytes"},"source_id":"1402.2571","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:966b813e5576f03957a950f014608f83c27d960f35831b535a7f4ba4a9c251a3","sha256:3cac1a49da9bd39a204067532a184d05b25384c9e22c949dc8a48eb372a2229a"],"state_sha256":"e5d6df35fcdb0fbff2333955927c18a5f210972431f03c2f617f9e8eb4c0fb88"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"grnR61of4Q8KchCUTMmNy0GjrU+HWh65ODZ3Enhy8ZXwBPQX5ddkSfEgtiSRrnfvICrQ172r8tPbCxBIz0JVBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:40:13.606449Z","bundle_sha256":"06e0cde41993d377123ce9eb8b9e03213e78ca7a5315a576579454d76cef96dd"}}