{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:YSAZWUS2DZRAWHJTNYCNE5GATE","short_pith_number":"pith:YSAZWUS2","canonical_record":{"source":{"id":"1201.1345","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-01-06T03:53:32Z","cross_cats_sorted":["cs.DB"],"title_canon_sha256":"9cbb6db81fcda2cd26da2f1facfbcd114afa2eafc541d674c8706a809cdba60a","abstract_canon_sha256":"a36d00b87fc7154ad0e3af435bed05f28d0e72f0160ed224b1e027e081c804c0"},"schema_version":"1.0"},"canonical_sha256":"c4819b525a1e620b1d336e04d274c09924ce77dbb6826a52337c4d0157e110bd","source":{"kind":"arxiv","id":"1201.1345","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.1345","created_at":"2026-05-18T04:05:04Z"},{"alias_kind":"arxiv_version","alias_value":"1201.1345v1","created_at":"2026-05-18T04:05:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.1345","created_at":"2026-05-18T04:05:04Z"},{"alias_kind":"pith_short_12","alias_value":"YSAZWUS2DZRA","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"YSAZWUS2DZRAWHJT","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"YSAZWUS2","created_at":"2026-05-18T12:27:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:YSAZWUS2DZRAWHJTNYCNE5GATE","target":"record","payload":{"canonical_record":{"source":{"id":"1201.1345","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-01-06T03:53:32Z","cross_cats_sorted":["cs.DB"],"title_canon_sha256":"9cbb6db81fcda2cd26da2f1facfbcd114afa2eafc541d674c8706a809cdba60a","abstract_canon_sha256":"a36d00b87fc7154ad0e3af435bed05f28d0e72f0160ed224b1e027e081c804c0"},"schema_version":"1.0"},"canonical_sha256":"c4819b525a1e620b1d336e04d274c09924ce77dbb6826a52337c4d0157e110bd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:05:04.842307Z","signature_b64":"kGJLY+SP4IVuQr5kGa6KEMC50S7BY5ULvpDcAWp4WJBC7+3w8ekApgSI3MYl9z9qjQcjLpqT7JkfRD91xhFLCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c4819b525a1e620b1d336e04d274c09924ce77dbb6826a52337c4d0157e110bd","last_reissued_at":"2026-05-18T04:05:04.841717Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:05:04.841717Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1201.1345","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":"2026-05-18T04:05:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Vc1v7/jTRxAbrlxnHUEsC4Uo62Mxxba5BWatKt0UHtORrvbsS3wq4VQSN9M6gZrmmHJZo3SL9T/SvchHt7LHAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T07:52:32.232002Z"},"content_sha256":"d3f0a2afb9e1c0abb24e052d1660b6815defe56bec0bd247630a48e92a613cd7","schema_version":"1.0","event_id":"sha256:d3f0a2afb9e1c0abb24e052d1660b6815defe56bec0bd247630a48e92a613cd7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:YSAZWUS2DZRAWHJTNYCNE5GATE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"FITS Checksum Proposal","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.DB"],"primary_cat":"astro-ph.IM","authors_text":"Arnold Rots, Rob Seaman, William Pence","submitted_at":"2012-01-06T03:53:32Z","abstract_excerpt":"The checksum keywords described here provide an integrity check on the information contained in FITS HDUs. (Header and Data Units are the basic components of FITS files, consisting of header keyword records followed by optional associated data records). The CHECKSUM keyword is defined to have a value that forces the 32-bit 1's complement checksum accumulated over all the 2880-byte FITS logical records in the HDU to equal negative 0. (Note that 1's complement arithmetic has both positive and negative zero elements). Verifying that the accumulated checksum is still equal to -0 provides a fast an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.1345","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":"2026-05-18T04:05:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+Z0+Z61821ONQKopa70cc9S1+7iLj51eJ6NEfE2kolEtv/CTtd2jkPakNJQdhZemsjoplWBThNcDMmey27s8Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T07:52:32.232357Z"},"content_sha256":"60d430eb625bb04a1f1df03733396fbe569eb50a02fb755992d8077171079dbe","schema_version":"1.0","event_id":"sha256:60d430eb625bb04a1f1df03733396fbe569eb50a02fb755992d8077171079dbe"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YSAZWUS2DZRAWHJTNYCNE5GATE/bundle.json","state_url":"https://pith.science/pith/YSAZWUS2DZRAWHJTNYCNE5GATE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YSAZWUS2DZRAWHJTNYCNE5GATE/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":"2026-06-02T07:52:32Z","links":{"resolver":"https://pith.science/pith/YSAZWUS2DZRAWHJTNYCNE5GATE","bundle":"https://pith.science/pith/YSAZWUS2DZRAWHJTNYCNE5GATE/bundle.json","state":"https://pith.science/pith/YSAZWUS2DZRAWHJTNYCNE5GATE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YSAZWUS2DZRAWHJTNYCNE5GATE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:YSAZWUS2DZRAWHJTNYCNE5GATE","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":"a36d00b87fc7154ad0e3af435bed05f28d0e72f0160ed224b1e027e081c804c0","cross_cats_sorted":["cs.DB"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-01-06T03:53:32Z","title_canon_sha256":"9cbb6db81fcda2cd26da2f1facfbcd114afa2eafc541d674c8706a809cdba60a"},"schema_version":"1.0","source":{"id":"1201.1345","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.1345","created_at":"2026-05-18T04:05:04Z"},{"alias_kind":"arxiv_version","alias_value":"1201.1345v1","created_at":"2026-05-18T04:05:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.1345","created_at":"2026-05-18T04:05:04Z"},{"alias_kind":"pith_short_12","alias_value":"YSAZWUS2DZRA","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"YSAZWUS2DZRAWHJT","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"YSAZWUS2","created_at":"2026-05-18T12:27:30Z"}],"graph_snapshots":[{"event_id":"sha256:60d430eb625bb04a1f1df03733396fbe569eb50a02fb755992d8077171079dbe","target":"graph","created_at":"2026-05-18T04:05:04Z","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 checksum keywords described here provide an integrity check on the information contained in FITS HDUs. (Header and Data Units are the basic components of FITS files, consisting of header keyword records followed by optional associated data records). The CHECKSUM keyword is defined to have a value that forces the 32-bit 1's complement checksum accumulated over all the 2880-byte FITS logical records in the HDU to equal negative 0. (Note that 1's complement arithmetic has both positive and negative zero elements). Verifying that the accumulated checksum is still equal to -0 provides a fast an","authors_text":"Arnold Rots, Rob Seaman, William Pence","cross_cats":["cs.DB"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-01-06T03:53:32Z","title":"FITS Checksum Proposal"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.1345","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:d3f0a2afb9e1c0abb24e052d1660b6815defe56bec0bd247630a48e92a613cd7","target":"record","created_at":"2026-05-18T04:05:04Z","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":"a36d00b87fc7154ad0e3af435bed05f28d0e72f0160ed224b1e027e081c804c0","cross_cats_sorted":["cs.DB"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-01-06T03:53:32Z","title_canon_sha256":"9cbb6db81fcda2cd26da2f1facfbcd114afa2eafc541d674c8706a809cdba60a"},"schema_version":"1.0","source":{"id":"1201.1345","kind":"arxiv","version":1}},"canonical_sha256":"c4819b525a1e620b1d336e04d274c09924ce77dbb6826a52337c4d0157e110bd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c4819b525a1e620b1d336e04d274c09924ce77dbb6826a52337c4d0157e110bd","first_computed_at":"2026-05-18T04:05:04.841717Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:05:04.841717Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kGJLY+SP4IVuQr5kGa6KEMC50S7BY5ULvpDcAWp4WJBC7+3w8ekApgSI3MYl9z9qjQcjLpqT7JkfRD91xhFLCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:05:04.842307Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.1345","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d3f0a2afb9e1c0abb24e052d1660b6815defe56bec0bd247630a48e92a613cd7","sha256:60d430eb625bb04a1f1df03733396fbe569eb50a02fb755992d8077171079dbe"],"state_sha256":"381299e4951c48561d5d845237a6d27e540f399c0936daee419de9b656b2b13a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n5z8ZMYwHYEjGXofB9g7gOmC2ajlkvN3FKZ2TsURFbHFlRxJhNoCZ+qXhnrJR0lqf6wejShU6i++ATCyTzA8Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T07:52:32.234134Z","bundle_sha256":"907bac05c18c6ac01f0684ff8e828210de0d677c1d58fc9c1d0989d7b60f5537"}}