{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:ZC7XRR3IMHWZQYCFQXT6XAIOFQ","short_pith_number":"pith:ZC7XRR3I","canonical_record":{"source":{"id":"2108.02738","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-05T16:58:09Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"95afa97a7313a5cfd6e64df1cf67e70063cdb67a175af245f309132161de5d73","abstract_canon_sha256":"f203f160c6ab4517cda12fe2d5c3ce7cea87bade3d138e10e0efae3ddb3ec677"},"schema_version":"1.0"},"canonical_sha256":"c8bf78c76861ed98604585e7eb810e2c289860e683224a7528e160c78a079c1a","source":{"kind":"arxiv","id":"2108.02738","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.02738","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"arxiv_version","alias_value":"2108.02738v3","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.02738","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"pith_short_12","alias_value":"ZC7XRR3IMHWZ","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"pith_short_16","alias_value":"ZC7XRR3IMHWZQYCF","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"pith_short_8","alias_value":"ZC7XRR3I","created_at":"2026-07-05T03:49:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:ZC7XRR3IMHWZQYCFQXT6XAIOFQ","target":"record","payload":{"canonical_record":{"source":{"id":"2108.02738","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-05T16:58:09Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"95afa97a7313a5cfd6e64df1cf67e70063cdb67a175af245f309132161de5d73","abstract_canon_sha256":"f203f160c6ab4517cda12fe2d5c3ce7cea87bade3d138e10e0efae3ddb3ec677"},"schema_version":"1.0"},"canonical_sha256":"c8bf78c76861ed98604585e7eb810e2c289860e683224a7528e160c78a079c1a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:49:16.253440Z","signature_b64":"ItVbPzXmlKPWjAKC4lzNATJNAVz+swOXqHPnysSPf6gF+FR5VSuKdLQoUo3v7hCdIoj31OLjxlhmOvJPH15TDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c8bf78c76861ed98604585e7eb810e2c289860e683224a7528e160c78a079c1a","last_reissued_at":"2026-07-05T03:49:16.252961Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:49:16.252961Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.02738","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:49:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0ZbX4tPfxc7GBUZEnKJrw4D+a0yykAgwedxIEMrvxYB28xLl7kYCKWyeP2J//rKm17WMP+R8gZszPx7KzFCIBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T19:58:42.876118Z"},"content_sha256":"5564059e5bfeec15873bf9c9b05ca87f12276c176818d1cd9e18f7a85fddd5a8","schema_version":"1.0","event_id":"sha256:5564059e5bfeec15873bf9c9b05ca87f12276c176818d1cd9e18f7a85fddd5a8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:ZC7XRR3IMHWZQYCFQXT6XAIOFQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Time Delay Interferometry combinations as instrument noise monitors for LISA","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"gr-qc","authors_text":"Daniele Vetrugno, Martina Muratore, Olaf Hartwig, Stefano Vitale","submitted_at":"2021-08-05T16:58:09Z","abstract_excerpt":"The LISA mission will likely be a signal dominated detector, such that one challenge is the separation of the different astrophysical sources, and to distinguish between them and the instrumental noise. One of the goals of LISA is to probe the early Universe by detecting stochastic GW backgrounds. As correlation with other detectors is not possible for LISA, discrimination of such a GW background from the instrumental noise requires a good estimate of the latter. To this purpose we have revisited Time Delay Interferometry (TDI) to look for new TDI signal combinations that fulfill the laser fre"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.02738","kind":"arxiv","version":3},"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/2108.02738/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":"2026-07-05T03:49:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PSAMrP/YxFQJKDPFdUV7+vvPJ3nTDgscmf8FgxOk9jLm84DPqRQ2qNwaTN3J2+iSji8dGZMPqktlVOWISdCVAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T19:58:42.876688Z"},"content_sha256":"3d338e91270c3501f94f53f5ef65232f2a3acdcd30a522d21c653fc87ddad342","schema_version":"1.0","event_id":"sha256:3d338e91270c3501f94f53f5ef65232f2a3acdcd30a522d21c653fc87ddad342"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZC7XRR3IMHWZQYCFQXT6XAIOFQ/bundle.json","state_url":"https://pith.science/pith/ZC7XRR3IMHWZQYCFQXT6XAIOFQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZC7XRR3IMHWZQYCFQXT6XAIOFQ/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":"2026-08-06T19:58:42Z","links":{"resolver":"https://pith.science/pith/ZC7XRR3IMHWZQYCFQXT6XAIOFQ","bundle":"https://pith.science/pith/ZC7XRR3IMHWZQYCFQXT6XAIOFQ/bundle.json","state":"https://pith.science/pith/ZC7XRR3IMHWZQYCFQXT6XAIOFQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZC7XRR3IMHWZQYCFQXT6XAIOFQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:ZC7XRR3IMHWZQYCFQXT6XAIOFQ","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":"f203f160c6ab4517cda12fe2d5c3ce7cea87bade3d138e10e0efae3ddb3ec677","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-05T16:58:09Z","title_canon_sha256":"95afa97a7313a5cfd6e64df1cf67e70063cdb67a175af245f309132161de5d73"},"schema_version":"1.0","source":{"id":"2108.02738","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.02738","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"arxiv_version","alias_value":"2108.02738v3","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.02738","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"pith_short_12","alias_value":"ZC7XRR3IMHWZ","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"pith_short_16","alias_value":"ZC7XRR3IMHWZQYCF","created_at":"2026-07-05T03:49:16Z"},{"alias_kind":"pith_short_8","alias_value":"ZC7XRR3I","created_at":"2026-07-05T03:49:16Z"}],"graph_snapshots":[{"event_id":"sha256:3d338e91270c3501f94f53f5ef65232f2a3acdcd30a522d21c653fc87ddad342","target":"graph","created_at":"2026-07-05T03:49:16Z","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/2108.02738/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The LISA mission will likely be a signal dominated detector, such that one challenge is the separation of the different astrophysical sources, and to distinguish between them and the instrumental noise. One of the goals of LISA is to probe the early Universe by detecting stochastic GW backgrounds. As correlation with other detectors is not possible for LISA, discrimination of such a GW background from the instrumental noise requires a good estimate of the latter. To this purpose we have revisited Time Delay Interferometry (TDI) to look for new TDI signal combinations that fulfill the laser fre","authors_text":"Daniele Vetrugno, Martina Muratore, Olaf Hartwig, Stefano Vitale","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-05T16:58:09Z","title":"Time Delay Interferometry combinations as instrument noise monitors for LISA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.02738","kind":"arxiv","version":3},"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":"sha256:5564059e5bfeec15873bf9c9b05ca87f12276c176818d1cd9e18f7a85fddd5a8","target":"record","created_at":"2026-07-05T03:49:16Z","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":"f203f160c6ab4517cda12fe2d5c3ce7cea87bade3d138e10e0efae3ddb3ec677","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-05T16:58:09Z","title_canon_sha256":"95afa97a7313a5cfd6e64df1cf67e70063cdb67a175af245f309132161de5d73"},"schema_version":"1.0","source":{"id":"2108.02738","kind":"arxiv","version":3}},"canonical_sha256":"c8bf78c76861ed98604585e7eb810e2c289860e683224a7528e160c78a079c1a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c8bf78c76861ed98604585e7eb810e2c289860e683224a7528e160c78a079c1a","first_computed_at":"2026-07-05T03:49:16.252961Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:49:16.252961Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ItVbPzXmlKPWjAKC4lzNATJNAVz+swOXqHPnysSPf6gF+FR5VSuKdLQoUo3v7hCdIoj31OLjxlhmOvJPH15TDw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:49:16.253440Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.02738","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5564059e5bfeec15873bf9c9b05ca87f12276c176818d1cd9e18f7a85fddd5a8","sha256:3d338e91270c3501f94f53f5ef65232f2a3acdcd30a522d21c653fc87ddad342"],"state_sha256":"b50f7ec56e7acdc9a740d111cc9ce6ae3219dd42ef452cba2a299b1573882d91"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l2ZzZ9ZbrZVoSajqpo7A55t5mtmFDO10Z2F7clhUTppnmR0QkrOIHhB2RObETsCFp+clA3zNGuNJSDH55dUGAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T19:58:42.880289Z","bundle_sha256":"d5dfcac9b31bf1ab5e842d18105ee22c149a5f56b05eb918ff6cf6a9d70ecfa0"}}