{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:4VCCGA7VU3K53I4TPPF3RDKTMB","short_pith_number":"pith:4VCCGA7V","canonical_record":{"source":{"id":"2002.10250","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-02-18T22:43:47Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"title_canon_sha256":"1d1c368923ba039527e855d8bfb156cd6498667dc2ded172575eb41b2281d342","abstract_canon_sha256":"8b03efbcc2bf590c8df5febcb31cd1f93c4d332c7aa54a05f4c3f8fe820ecdf9"},"schema_version":"1.0"},"canonical_sha256":"e5442303f5a6d5dda3937bcbb88d53604898ca2152f10b66058d900e5f5931c5","source":{"kind":"arxiv","id":"2002.10250","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.10250","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"arxiv_version","alias_value":"2002.10250v1","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.10250","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"pith_short_12","alias_value":"4VCCGA7VU3K5","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"pith_short_16","alias_value":"4VCCGA7VU3K53I4T","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"pith_short_8","alias_value":"4VCCGA7V","created_at":"2026-07-05T00:45:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:4VCCGA7VU3K53I4TPPF3RDKTMB","target":"record","payload":{"canonical_record":{"source":{"id":"2002.10250","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-02-18T22:43:47Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"title_canon_sha256":"1d1c368923ba039527e855d8bfb156cd6498667dc2ded172575eb41b2281d342","abstract_canon_sha256":"8b03efbcc2bf590c8df5febcb31cd1f93c4d332c7aa54a05f4c3f8fe820ecdf9"},"schema_version":"1.0"},"canonical_sha256":"e5442303f5a6d5dda3937bcbb88d53604898ca2152f10b66058d900e5f5931c5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:45:24.378574Z","signature_b64":"ooPEagx2C8d6sPs1ZYTUScZn01bqwpZFyGPtdb4njX2ohqzwHFJiBcve+/RSyBi5ZMQB4jIq8PaWhNA2x6f6CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e5442303f5a6d5dda3937bcbb88d53604898ca2152f10b66058d900e5f5931c5","last_reissued_at":"2026-07-05T00:45:24.378014Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:45:24.378014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2002.10250","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":"2026-07-05T00:45:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sFWHriCC+7KWV3EaSYpQ88COecONJy6qxxdmsBWtwzrljY/patp7WJeQoLr84oUX27fXbC/G3rjZ2PH37hyMCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T15:22:32.430574Z"},"content_sha256":"6ee81dbffa30ae4dab1e2d8910e51d2aa12a650b0f68ba1ba0f73c66d5edefc1","schema_version":"1.0","event_id":"sha256:6ee81dbffa30ae4dab1e2d8910e51d2aa12a650b0f68ba1ba0f73c66d5edefc1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:4VCCGA7VU3K53I4TPPF3RDKTMB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Thousand-Pulsar-Array programme on MeerKAT I: Science objectives and first results","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. Jameson. M. Kramer, A. Karastergiou, A. Parthasarathy, A. Ridolfi, A. Szary, B. Hugo, B. Posselt, B. W. Meyers, C. Sobey, D. J. Reardon, F. Abbate, F. Camilo, F. Jankowski, J. van Leeuwen, L. Oswald, M. Bailes, M. Geyer, M. J. Keith, M. Serylak, P. Weltevrede, R. M. Shannon, R. Spiewak, S. Buchner, Simon Johnston, V. Venkatraman Krishnan, W. van Straten, X. Song","submitted_at":"2020-02-18T22:43:47Z","abstract_excerpt":"We report here on initial results from the Thousand Pulsar Array (TPA) programme, part of the Large Survey Project \"MeerTime\" on the MeerKAT telescope. The interferometer is used in tied-array mode in the band from 856 to 1712~MHz, and the wide band coupled with the large collecting area and low receiver temperature make it an excellent telescope for the study of radio pulsars. The TPA is a 5 year project which aims to observe (a) more than 1000 pulsars to obtain high-fidelity pulse profiles, (b) some 500 of these pulsars over multiple epochs, (c) long sequences of single-pulse trains from sev"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.10250","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/2002.10250/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":"2026-07-05T00:45:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eYICspqdSSUr+u/gndzOQJ2Jtbo4Izk84WsOATsVGH0zRhTpCPEuwjwnDsNFoZHGpjXh9yMTsruP/wZH5B52CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T15:22:32.430961Z"},"content_sha256":"4acdb502f13e3fcbe7bf218f50dae1c67e8b3170a20edd75046a72cc631438a5","schema_version":"1.0","event_id":"sha256:4acdb502f13e3fcbe7bf218f50dae1c67e8b3170a20edd75046a72cc631438a5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4VCCGA7VU3K53I4TPPF3RDKTMB/bundle.json","state_url":"https://pith.science/pith/4VCCGA7VU3K53I4TPPF3RDKTMB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4VCCGA7VU3K53I4TPPF3RDKTMB/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":"2026-07-21T15:22:32Z","links":{"resolver":"https://pith.science/pith/4VCCGA7VU3K53I4TPPF3RDKTMB","bundle":"https://pith.science/pith/4VCCGA7VU3K53I4TPPF3RDKTMB/bundle.json","state":"https://pith.science/pith/4VCCGA7VU3K53I4TPPF3RDKTMB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4VCCGA7VU3K53I4TPPF3RDKTMB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:4VCCGA7VU3K53I4TPPF3RDKTMB","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":"8b03efbcc2bf590c8df5febcb31cd1f93c4d332c7aa54a05f4c3f8fe820ecdf9","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-02-18T22:43:47Z","title_canon_sha256":"1d1c368923ba039527e855d8bfb156cd6498667dc2ded172575eb41b2281d342"},"schema_version":"1.0","source":{"id":"2002.10250","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.10250","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"arxiv_version","alias_value":"2002.10250v1","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.10250","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"pith_short_12","alias_value":"4VCCGA7VU3K5","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"pith_short_16","alias_value":"4VCCGA7VU3K53I4T","created_at":"2026-07-05T00:45:24Z"},{"alias_kind":"pith_short_8","alias_value":"4VCCGA7V","created_at":"2026-07-05T00:45:24Z"}],"graph_snapshots":[{"event_id":"sha256:4acdb502f13e3fcbe7bf218f50dae1c67e8b3170a20edd75046a72cc631438a5","target":"graph","created_at":"2026-07-05T00:45:24Z","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/2002.10250/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report here on initial results from the Thousand Pulsar Array (TPA) programme, part of the Large Survey Project \"MeerTime\" on the MeerKAT telescope. The interferometer is used in tied-array mode in the band from 856 to 1712~MHz, and the wide band coupled with the large collecting area and low receiver temperature make it an excellent telescope for the study of radio pulsars. The TPA is a 5 year project which aims to observe (a) more than 1000 pulsars to obtain high-fidelity pulse profiles, (b) some 500 of these pulsars over multiple epochs, (c) long sequences of single-pulse trains from sev","authors_text":"A. Jameson. M. Kramer, A. Karastergiou, A. Parthasarathy, A. Ridolfi, A. Szary, B. Hugo, B. Posselt, B. W. Meyers, C. Sobey, D. J. Reardon, F. Abbate, F. Camilo, F. Jankowski, J. van Leeuwen, L. Oswald, M. Bailes, M. Geyer, M. J. Keith, M. Serylak, P. Weltevrede, R. M. Shannon, R. Spiewak, S. Buchner, Simon Johnston, V. Venkatraman Krishnan, W. van Straten, X. Song","cross_cats":["astro-ph.IM","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-02-18T22:43:47Z","title":"The Thousand-Pulsar-Array programme on MeerKAT I: Science objectives and first results"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.10250","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":"sha256:6ee81dbffa30ae4dab1e2d8910e51d2aa12a650b0f68ba1ba0f73c66d5edefc1","target":"record","created_at":"2026-07-05T00:45:24Z","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":"8b03efbcc2bf590c8df5febcb31cd1f93c4d332c7aa54a05f4c3f8fe820ecdf9","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-02-18T22:43:47Z","title_canon_sha256":"1d1c368923ba039527e855d8bfb156cd6498667dc2ded172575eb41b2281d342"},"schema_version":"1.0","source":{"id":"2002.10250","kind":"arxiv","version":1}},"canonical_sha256":"e5442303f5a6d5dda3937bcbb88d53604898ca2152f10b66058d900e5f5931c5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e5442303f5a6d5dda3937bcbb88d53604898ca2152f10b66058d900e5f5931c5","first_computed_at":"2026-07-05T00:45:24.378014Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:45:24.378014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ooPEagx2C8d6sPs1ZYTUScZn01bqwpZFyGPtdb4njX2ohqzwHFJiBcve+/RSyBi5ZMQB4jIq8PaWhNA2x6f6CQ==","signature_status":"signed_v1","signed_at":"2026-07-05T00:45:24.378574Z","signed_message":"canonical_sha256_bytes"},"source_id":"2002.10250","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6ee81dbffa30ae4dab1e2d8910e51d2aa12a650b0f68ba1ba0f73c66d5edefc1","sha256:4acdb502f13e3fcbe7bf218f50dae1c67e8b3170a20edd75046a72cc631438a5"],"state_sha256":"c88e0559710737e3fd2896a3362e6216c45975a9e72e050ed0b4ccb2c0d0417e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wEF/dmUVHBQ+Oc7f4By9pCkBE0hpfBbCLJAv6mNOmWlaPeOnUz6fT12vE7GlE+K7ikecxChe+YZcLKnn5DGsBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-21T15:22:32.433182Z","bundle_sha256":"956e14c2ebdd960ff58cfd5972abeb3b6f56b881cc3abe1399c2a19801a4d6a2"}}