{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:Q2ZQ7TR4GQSICNSBOYPU5HUZFY","short_pith_number":"pith:Q2ZQ7TR4","canonical_record":{"source":{"id":"1902.10269","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-27T00:01:58Z","cross_cats_sorted":[],"title_canon_sha256":"c3f0a7bfdbcf0beb2545e131fee85a51bdad2d38968bbecb0295375bd686e671","abstract_canon_sha256":"031638079344db88c7ef2bfaf487ee853e3aec1632781ab42338fffc64cde871"},"schema_version":"1.0"},"canonical_sha256":"86b30fce3c3424813641761f4e9e992e09e01eb7f7e2934d499a6cb19fbf028a","source":{"kind":"arxiv","id":"1902.10269","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.10269","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"arxiv_version","alias_value":"1902.10269v2","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.10269","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"pith_short_12","alias_value":"Q2ZQ7TR4GQSI","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"pith_short_16","alias_value":"Q2ZQ7TR4GQSICNSB","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"pith_short_8","alias_value":"Q2ZQ7TR4","created_at":"2026-07-04T23:57:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:Q2ZQ7TR4GQSICNSBOYPU5HUZFY","target":"record","payload":{"canonical_record":{"source":{"id":"1902.10269","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-27T00:01:58Z","cross_cats_sorted":[],"title_canon_sha256":"c3f0a7bfdbcf0beb2545e131fee85a51bdad2d38968bbecb0295375bd686e671","abstract_canon_sha256":"031638079344db88c7ef2bfaf487ee853e3aec1632781ab42338fffc64cde871"},"schema_version":"1.0"},"canonical_sha256":"86b30fce3c3424813641761f4e9e992e09e01eb7f7e2934d499a6cb19fbf028a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:57:49.625520Z","signature_b64":"lP/Tjrbp3Gj1ZItN2OdQTFPl1R2cuVZnZn0fku4oh5z48FO1ThujTgQp1kv9d5KFacbr8vglexsAw8kFgT6tDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"86b30fce3c3424813641761f4e9e992e09e01eb7f7e2934d499a6cb19fbf028a","last_reissued_at":"2026-07-04T23:57:49.625013Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:57:49.625013Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.10269","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T23:57:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"POPr6Bh/i5sy1ds7zgi0Q+jCHymL+at1EzvzO34KtgaadTTBYJg04klkinjr6Lqom1mWlsMZCUI1p/oJOPBEDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T17:23:22.756091Z"},"content_sha256":"fbc786a2a71201a3acaaef781cd8f983df9f15cf63ff145977ad12c99cd455d8","schema_version":"1.0","event_id":"sha256:fbc786a2a71201a3acaaef781cd8f983df9f15cf63ff145977ad12c99cd455d8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:Q2ZQ7TR4GQSICNSBOYPU5HUZFY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Neutron star pulse profile observations as extreme gravity probes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Hector O. Silva, Nicol\\'as Yunes","submitted_at":"2019-02-27T00:01:58Z","abstract_excerpt":"The x-ray emission of hot spots on the surface of neutron stars is the prime target of the Neutron star Interior Composition Explorer (NICER). These x-ray pulse profiles not only encode information of the bulk properties of these stars, which teaches us about matter at supranuclear densities, but also about the spacetime curvature around them which teaches us about relativistic gravity. We explore the possibility of performing strong-gravity tests with NICER observations using a recently developed pulse profile model beyond general relativity. Our results suggest that NICER can place constrain"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.10269","kind":"arxiv","version":2},"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/1902.10269/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":"2026-07-04T23:57:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8YjDUu7hRZ2q/HOCIgdeRFqWVpO8UgsWx2pixTDyEDap1DyJlpkN8Q53h7sLNRA8FIkbcmh2PwVCQHZhXHWIAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T17:23:22.756653Z"},"content_sha256":"5d40d911834ae243e89f8d4137874c95dbe3e70d770c36ea6a1f44b825016026","schema_version":"1.0","event_id":"sha256:5d40d911834ae243e89f8d4137874c95dbe3e70d770c36ea6a1f44b825016026"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Q2ZQ7TR4GQSICNSBOYPU5HUZFY/bundle.json","state_url":"https://pith.science/pith/Q2ZQ7TR4GQSICNSBOYPU5HUZFY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Q2ZQ7TR4GQSICNSBOYPU5HUZFY/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":"2026-08-18T17:23:22Z","links":{"resolver":"https://pith.science/pith/Q2ZQ7TR4GQSICNSBOYPU5HUZFY","bundle":"https://pith.science/pith/Q2ZQ7TR4GQSICNSBOYPU5HUZFY/bundle.json","state":"https://pith.science/pith/Q2ZQ7TR4GQSICNSBOYPU5HUZFY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Q2ZQ7TR4GQSICNSBOYPU5HUZFY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:Q2ZQ7TR4GQSICNSBOYPU5HUZFY","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":"031638079344db88c7ef2bfaf487ee853e3aec1632781ab42338fffc64cde871","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-27T00:01:58Z","title_canon_sha256":"c3f0a7bfdbcf0beb2545e131fee85a51bdad2d38968bbecb0295375bd686e671"},"schema_version":"1.0","source":{"id":"1902.10269","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.10269","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"arxiv_version","alias_value":"1902.10269v2","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.10269","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"pith_short_12","alias_value":"Q2ZQ7TR4GQSI","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"pith_short_16","alias_value":"Q2ZQ7TR4GQSICNSB","created_at":"2026-07-04T23:57:49Z"},{"alias_kind":"pith_short_8","alias_value":"Q2ZQ7TR4","created_at":"2026-07-04T23:57:49Z"}],"graph_snapshots":[{"event_id":"sha256:5d40d911834ae243e89f8d4137874c95dbe3e70d770c36ea6a1f44b825016026","target":"graph","created_at":"2026-07-04T23:57:49Z","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/1902.10269/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The x-ray emission of hot spots on the surface of neutron stars is the prime target of the Neutron star Interior Composition Explorer (NICER). These x-ray pulse profiles not only encode information of the bulk properties of these stars, which teaches us about matter at supranuclear densities, but also about the spacetime curvature around them which teaches us about relativistic gravity. We explore the possibility of performing strong-gravity tests with NICER observations using a recently developed pulse profile model beyond general relativity. Our results suggest that NICER can place constrain","authors_text":"Hector O. Silva, Nicol\\'as Yunes","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-27T00:01:58Z","title":"Neutron star pulse profile observations as extreme gravity probes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.10269","kind":"arxiv","version":2},"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:fbc786a2a71201a3acaaef781cd8f983df9f15cf63ff145977ad12c99cd455d8","target":"record","created_at":"2026-07-04T23:57:49Z","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":"031638079344db88c7ef2bfaf487ee853e3aec1632781ab42338fffc64cde871","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-02-27T00:01:58Z","title_canon_sha256":"c3f0a7bfdbcf0beb2545e131fee85a51bdad2d38968bbecb0295375bd686e671"},"schema_version":"1.0","source":{"id":"1902.10269","kind":"arxiv","version":2}},"canonical_sha256":"86b30fce3c3424813641761f4e9e992e09e01eb7f7e2934d499a6cb19fbf028a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"86b30fce3c3424813641761f4e9e992e09e01eb7f7e2934d499a6cb19fbf028a","first_computed_at":"2026-07-04T23:57:49.625013Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:57:49.625013Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lP/Tjrbp3Gj1ZItN2OdQTFPl1R2cuVZnZn0fku4oh5z48FO1ThujTgQp1kv9d5KFacbr8vglexsAw8kFgT6tDQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:57:49.625520Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.10269","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fbc786a2a71201a3acaaef781cd8f983df9f15cf63ff145977ad12c99cd455d8","sha256:5d40d911834ae243e89f8d4137874c95dbe3e70d770c36ea6a1f44b825016026"],"state_sha256":"f7b1f1b4c69674dda46c6b2406745d45ee334a1336018fe9d9b17187d3b4ae06"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8ZFSIXQiW+cuEpFn9XPXhlw3vjRoDubKxaLq+I0gTC5iv/NUg2yIbyNBjxHHv9kNz7jD5QtOyiG//GixlbHuDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T17:23:22.761826Z","bundle_sha256":"c745347bb40be36f3c004ebb7a72eb29bc93a4fa9fe807e91104a5f558283d7e"}}