{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:4UPJNJA2OIYXLQ7WNYDTCNYE6H","short_pith_number":"pith:4UPJNJA2","canonical_record":{"source":{"id":"2104.03137","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-04-07T14:08:18Z","cross_cats_sorted":[],"title_canon_sha256":"3323b0f32dbbe8c507174772bd7c4837fd62eb33b199b50a2641d34828351bfb","abstract_canon_sha256":"a5a93fe74790cba265696fdd3fb155320918928bcf8a7b6c5d58bb7a7abbd7ee"},"schema_version":"1.0"},"canonical_sha256":"e51e96a41a723175c3f66e07313704f1e40881a43d6daa53e20ca5ea9cdb93a4","source":{"kind":"arxiv","id":"2104.03137","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.03137","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"arxiv_version","alias_value":"2104.03137v1","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.03137","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"pith_short_12","alias_value":"4UPJNJA2OIYX","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"pith_short_16","alias_value":"4UPJNJA2OIYXLQ7W","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"pith_short_8","alias_value":"4UPJNJA2","created_at":"2026-07-05T02:30:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:4UPJNJA2OIYXLQ7WNYDTCNYE6H","target":"record","payload":{"canonical_record":{"source":{"id":"2104.03137","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-04-07T14:08:18Z","cross_cats_sorted":[],"title_canon_sha256":"3323b0f32dbbe8c507174772bd7c4837fd62eb33b199b50a2641d34828351bfb","abstract_canon_sha256":"a5a93fe74790cba265696fdd3fb155320918928bcf8a7b6c5d58bb7a7abbd7ee"},"schema_version":"1.0"},"canonical_sha256":"e51e96a41a723175c3f66e07313704f1e40881a43d6daa53e20ca5ea9cdb93a4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:30:03.252728Z","signature_b64":"twE6xOfyqsg0Of7DDkPsMMW96L7FJkfcFODnnyXR0eSuirrYff5/0JtnnViqlcqP9lKy6J6bVRB1uLwU2gnsCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e51e96a41a723175c3f66e07313704f1e40881a43d6daa53e20ca5ea9cdb93a4","last_reissued_at":"2026-07-05T02:30:03.252245Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:30:03.252245Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.03137","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":"2026-07-05T02:30:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/ge73PkHQKrX24PQY+BfI5BbbkIYo0QqwdLjHTKu2MA+PJiUHFUn0y82ipxsoP/S50lxpU3fSh2f7o+sQhEOCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T04:36:56.154314Z"},"content_sha256":"ff05e42549f66b72b779519f7607770331305984b7dff2dcbf3098307c4c33fc","schema_version":"1.0","event_id":"sha256:ff05e42549f66b72b779519f7607770331305984b7dff2dcbf3098307c4c33fc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:4UPJNJA2OIYXLQ7WNYDTCNYE6H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gravitational waves from isolated neutron stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Brynmor Haskell, Kai Schwenzer","submitted_at":"2021-04-07T14:08:18Z","abstract_excerpt":"Neutron star interiors are a fantastic laboratory for high density physics in extreme environments. Probing this system with standard electromagnetic observations is, however, a challenging endeavour, as the radiation tends to be scattered by the outer layers and the interstellar medium. Gravitational waves, on the other hand, while challenging to detect, interact weakly with matter and are likely to carry a clean imprint of the high density interior of the star. In particular long lived, i.e. `continuous' signals from isolated neutron stars can carry a signature of deformations, possibly in c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.03137","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2104.03137/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":"2026-07-05T02:30:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NZ6AnFcLQR7bG63nBp4ZiM1GT02mlcCVx5M35WVyLdTHpvZHhOHAUlV51zCESyMVZQeS9USq1ORVg44nNepHAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T04:36:56.154842Z"},"content_sha256":"ddf455b79c2ddb62673d15aa4abbdbf5b946d6ed8899d67db1109fc31f6eb656","schema_version":"1.0","event_id":"sha256:ddf455b79c2ddb62673d15aa4abbdbf5b946d6ed8899d67db1109fc31f6eb656"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4UPJNJA2OIYXLQ7WNYDTCNYE6H/bundle.json","state_url":"https://pith.science/pith/4UPJNJA2OIYXLQ7WNYDTCNYE6H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4UPJNJA2OIYXLQ7WNYDTCNYE6H/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":"2026-08-22T04:36:56Z","links":{"resolver":"https://pith.science/pith/4UPJNJA2OIYXLQ7WNYDTCNYE6H","bundle":"https://pith.science/pith/4UPJNJA2OIYXLQ7WNYDTCNYE6H/bundle.json","state":"https://pith.science/pith/4UPJNJA2OIYXLQ7WNYDTCNYE6H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4UPJNJA2OIYXLQ7WNYDTCNYE6H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:4UPJNJA2OIYXLQ7WNYDTCNYE6H","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":"a5a93fe74790cba265696fdd3fb155320918928bcf8a7b6c5d58bb7a7abbd7ee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-04-07T14:08:18Z","title_canon_sha256":"3323b0f32dbbe8c507174772bd7c4837fd62eb33b199b50a2641d34828351bfb"},"schema_version":"1.0","source":{"id":"2104.03137","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.03137","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"arxiv_version","alias_value":"2104.03137v1","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.03137","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"pith_short_12","alias_value":"4UPJNJA2OIYX","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"pith_short_16","alias_value":"4UPJNJA2OIYXLQ7W","created_at":"2026-07-05T02:30:03Z"},{"alias_kind":"pith_short_8","alias_value":"4UPJNJA2","created_at":"2026-07-05T02:30:03Z"}],"graph_snapshots":[{"event_id":"sha256:ddf455b79c2ddb62673d15aa4abbdbf5b946d6ed8899d67db1109fc31f6eb656","target":"graph","created_at":"2026-07-05T02:30:03Z","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/2104.03137/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Neutron star interiors are a fantastic laboratory for high density physics in extreme environments. Probing this system with standard electromagnetic observations is, however, a challenging endeavour, as the radiation tends to be scattered by the outer layers and the interstellar medium. Gravitational waves, on the other hand, while challenging to detect, interact weakly with matter and are likely to carry a clean imprint of the high density interior of the star. In particular long lived, i.e. `continuous' signals from isolated neutron stars can carry a signature of deformations, possibly in c","authors_text":"Brynmor Haskell, Kai Schwenzer","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-04-07T14:08:18Z","title":"Gravitational waves from isolated neutron stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.03137","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:ff05e42549f66b72b779519f7607770331305984b7dff2dcbf3098307c4c33fc","target":"record","created_at":"2026-07-05T02:30:03Z","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":"a5a93fe74790cba265696fdd3fb155320918928bcf8a7b6c5d58bb7a7abbd7ee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-04-07T14:08:18Z","title_canon_sha256":"3323b0f32dbbe8c507174772bd7c4837fd62eb33b199b50a2641d34828351bfb"},"schema_version":"1.0","source":{"id":"2104.03137","kind":"arxiv","version":1}},"canonical_sha256":"e51e96a41a723175c3f66e07313704f1e40881a43d6daa53e20ca5ea9cdb93a4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e51e96a41a723175c3f66e07313704f1e40881a43d6daa53e20ca5ea9cdb93a4","first_computed_at":"2026-07-05T02:30:03.252245Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:30:03.252245Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"twE6xOfyqsg0Of7DDkPsMMW96L7FJkfcFODnnyXR0eSuirrYff5/0JtnnViqlcqP9lKy6J6bVRB1uLwU2gnsCA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:30:03.252728Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.03137","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ff05e42549f66b72b779519f7607770331305984b7dff2dcbf3098307c4c33fc","sha256:ddf455b79c2ddb62673d15aa4abbdbf5b946d6ed8899d67db1109fc31f6eb656"],"state_sha256":"21daa32437659bfe0989c68e3132c6385dfdc5a74736bccab6a94146ec2fa8ea"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P+ajF0+bW4KUKbl3vl9JJI6zzwgKPWDApO5+vgKK8ilbk3EcpLJEHDZfg46OQrX6OyWh5bTpvK1nnVto2KdpAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T04:36:56.160024Z","bundle_sha256":"74b35326634758c08c6ac4de3f6135998c0b7b9c762de8e864e9d8af8922714c"}}