{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:Y3Y25OZ44HNPHGH6IMHHLPW32H","short_pith_number":"pith:Y3Y25OZ4","canonical_record":{"source":{"id":"astro-ph/9908131","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-08-12T13:05:07Z","cross_cats_sorted":[],"title_canon_sha256":"9c6dfcb43c67faed400c21f7415ee3bb6169cef276933b6bc1b03405074242f6","abstract_canon_sha256":"f7ad02e6be61844a2df2a9bd4125c2112daa87ab19d56e899151fe29132e01e9"},"schema_version":"1.0"},"canonical_sha256":"c6f1aebb3ce1daf398fe430e75bedbd1e802b19b51983588dd6b8b811d68332c","source":{"kind":"arxiv","id":"astro-ph/9908131","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9908131","created_at":"2026-05-18T03:57:01Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9908131v2","created_at":"2026-05-18T03:57:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9908131","created_at":"2026-05-18T03:57:01Z"},{"alias_kind":"pith_short_12","alias_value":"Y3Y25OZ44HNP","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"Y3Y25OZ44HNPHGH6","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"Y3Y25OZ4","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:Y3Y25OZ44HNPHGH6IMHHLPW32H","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9908131","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-08-12T13:05:07Z","cross_cats_sorted":[],"title_canon_sha256":"9c6dfcb43c67faed400c21f7415ee3bb6169cef276933b6bc1b03405074242f6","abstract_canon_sha256":"f7ad02e6be61844a2df2a9bd4125c2112daa87ab19d56e899151fe29132e01e9"},"schema_version":"1.0"},"canonical_sha256":"c6f1aebb3ce1daf398fe430e75bedbd1e802b19b51983588dd6b8b811d68332c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:57:01.124250Z","signature_b64":"2VAB2qNjPOhIX+m6tw691pVoKNZPjPOaYx/EM8dGo9/PQJh4xy7FyWN/ZkrNKIujsEN9vEu0x/ThDVhBN+ODBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c6f1aebb3ce1daf398fe430e75bedbd1e802b19b51983588dd6b8b811d68332c","last_reissued_at":"2026-05-18T03:57:01.123509Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:57:01.123509Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9908131","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":"2026-05-18T03:57:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qkf4AamMtjsXx3Dp6FCiZ5fnHfRLtw/TMv/1IHL0tGAK+SicURHuPP+94epTfZGD2d7Voksmg0DYOH5LI9i9Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T11:38:46.332733Z"},"content_sha256":"f437076e81d5ffef2bac1e0a1a19a9e746ce3b207f3ab7928b5192f652658f2a","schema_version":"1.0","event_id":"sha256:f437076e81d5ffef2bac1e0a1a19a9e746ce3b207f3ab7928b5192f652658f2a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:Y3Y25OZ44HNPHGH6IMHHLPW32H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The influence of bulge profile shapes on claims for a scale-free Hubble sequence for spirals","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Alister W. Graham, Mercedes Prieto","submitted_at":"1999-08-12T13:05:07Z","abstract_excerpt":"We investigate recent claims that the Hubble sequence of spiral galaxies is scale-free. Fundamental to this investigation is the fact that within the photometric data of 86 spiral galaxies from de Jong & van der Kruit - from which these claims were made - a trend exists between morphological type and bulge profile shape. While late-type spiral bulges are described by an exponential luminosity profile, the early-type spiral bulges are better described by an r^{1/2} or r^{1/4} law. Taking the scale-lengths from the best-fitting surface brightness profile models (i.e. either using exponential, r^"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9908131","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":""},"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":"2026-05-18T03:57:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zrhY8uTs80tt2yFa6HkLXq2PE5/vNSPRmxxtUEmM5RIWRK3F3THqKPX0m1lyDtlXikexyQUPDDyAGNLTxHiqDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T11:38:46.333078Z"},"content_sha256":"a26eb948e806bfb2496efb5823597f0a33baf11ef3873dc31bb9d647fb73edc5","schema_version":"1.0","event_id":"sha256:a26eb948e806bfb2496efb5823597f0a33baf11ef3873dc31bb9d647fb73edc5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y3Y25OZ44HNPHGH6IMHHLPW32H/bundle.json","state_url":"https://pith.science/pith/Y3Y25OZ44HNPHGH6IMHHLPW32H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y3Y25OZ44HNPHGH6IMHHLPW32H/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":"2026-05-28T11:38:46Z","links":{"resolver":"https://pith.science/pith/Y3Y25OZ44HNPHGH6IMHHLPW32H","bundle":"https://pith.science/pith/Y3Y25OZ44HNPHGH6IMHHLPW32H/bundle.json","state":"https://pith.science/pith/Y3Y25OZ44HNPHGH6IMHHLPW32H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y3Y25OZ44HNPHGH6IMHHLPW32H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:Y3Y25OZ44HNPHGH6IMHHLPW32H","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":"f7ad02e6be61844a2df2a9bd4125c2112daa87ab19d56e899151fe29132e01e9","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-08-12T13:05:07Z","title_canon_sha256":"9c6dfcb43c67faed400c21f7415ee3bb6169cef276933b6bc1b03405074242f6"},"schema_version":"1.0","source":{"id":"astro-ph/9908131","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9908131","created_at":"2026-05-18T03:57:01Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9908131v2","created_at":"2026-05-18T03:57:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9908131","created_at":"2026-05-18T03:57:01Z"},{"alias_kind":"pith_short_12","alias_value":"Y3Y25OZ44HNP","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"Y3Y25OZ44HNPHGH6","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"Y3Y25OZ4","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:a26eb948e806bfb2496efb5823597f0a33baf11ef3873dc31bb9d647fb73edc5","target":"graph","created_at":"2026-05-18T03:57:01Z","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":"We investigate recent claims that the Hubble sequence of spiral galaxies is scale-free. Fundamental to this investigation is the fact that within the photometric data of 86 spiral galaxies from de Jong & van der Kruit - from which these claims were made - a trend exists between morphological type and bulge profile shape. While late-type spiral bulges are described by an exponential luminosity profile, the early-type spiral bulges are better described by an r^{1/2} or r^{1/4} law. Taking the scale-lengths from the best-fitting surface brightness profile models (i.e. either using exponential, r^","authors_text":"Alister W. Graham, Mercedes Prieto","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-08-12T13:05:07Z","title":"The influence of bulge profile shapes on claims for a scale-free Hubble sequence for spirals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9908131","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:f437076e81d5ffef2bac1e0a1a19a9e746ce3b207f3ab7928b5192f652658f2a","target":"record","created_at":"2026-05-18T03:57:01Z","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":"f7ad02e6be61844a2df2a9bd4125c2112daa87ab19d56e899151fe29132e01e9","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-08-12T13:05:07Z","title_canon_sha256":"9c6dfcb43c67faed400c21f7415ee3bb6169cef276933b6bc1b03405074242f6"},"schema_version":"1.0","source":{"id":"astro-ph/9908131","kind":"arxiv","version":2}},"canonical_sha256":"c6f1aebb3ce1daf398fe430e75bedbd1e802b19b51983588dd6b8b811d68332c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c6f1aebb3ce1daf398fe430e75bedbd1e802b19b51983588dd6b8b811d68332c","first_computed_at":"2026-05-18T03:57:01.123509Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:57:01.123509Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2VAB2qNjPOhIX+m6tw691pVoKNZPjPOaYx/EM8dGo9/PQJh4xy7FyWN/ZkrNKIujsEN9vEu0x/ThDVhBN+ODBw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:57:01.124250Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9908131","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f437076e81d5ffef2bac1e0a1a19a9e746ce3b207f3ab7928b5192f652658f2a","sha256:a26eb948e806bfb2496efb5823597f0a33baf11ef3873dc31bb9d647fb73edc5"],"state_sha256":"e4fc3688df8463c4a2fb8eb976d7716fdf95a675f61d9a46c999352a78b61916"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R7Te53WJ7mReZpU8MpQnLo1+hnEamP99p4rJaFNBHFnhaKlfRY8ieK7n9wpiImReXtDKUoY+Uc8ADnHA+kKlCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T11:38:46.334993Z","bundle_sha256":"d1e9c3b207295cfaad4ab4fad93e55389fec1166fb290112706e853784a2a652"}}