{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1993:WHDMMWYL6PZIOQN33GYOVCEMXE","short_pith_number":"pith:WHDMMWYL","canonical_record":{"source":{"id":"astro-ph/9307006","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1993-07-05T15:34:02Z","cross_cats_sorted":[],"title_canon_sha256":"4321d31835884be12d686fa96c37b71fedda1054f10d714424864770ac7b81b9","abstract_canon_sha256":"c2bb8beca8e39c79d6d3ad85b60c5a34e8a43c80c6f395cdbff933f2e518775f"},"schema_version":"1.0"},"canonical_sha256":"b1c6c65b0bf3f28741bbd9b0ea888cb90bbf3758f9d7e7c1713b468d9fdac540","source":{"kind":"arxiv","id":"astro-ph/9307006","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9307006","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9307006v1","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9307006","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"pith_short_12","alias_value":"WHDMMWYL6PZI","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"pith_short_16","alias_value":"WHDMMWYL6PZIOQN3","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"pith_short_8","alias_value":"WHDMMWYL","created_at":"2026-07-04T15:55:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1993:WHDMMWYL6PZIOQN33GYOVCEMXE","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9307006","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1993-07-05T15:34:02Z","cross_cats_sorted":[],"title_canon_sha256":"4321d31835884be12d686fa96c37b71fedda1054f10d714424864770ac7b81b9","abstract_canon_sha256":"c2bb8beca8e39c79d6d3ad85b60c5a34e8a43c80c6f395cdbff933f2e518775f"},"schema_version":"1.0"},"canonical_sha256":"b1c6c65b0bf3f28741bbd9b0ea888cb90bbf3758f9d7e7c1713b468d9fdac540","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:55:06.974194Z","signature_b64":"w1aKT33u+iqrH1PVuJ/vLQQ26E5Oe7/vLa+ZBi0ceDtGMk4nSZM6k1kfRCXOn/GRvVi+n6ZZSRauwQn/MvG2Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b1c6c65b0bf3f28741bbd9b0ea888cb90bbf3758f9d7e7c1713b468d9fdac540","last_reissued_at":"2026-07-04T15:55:06.973770Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:55:06.973770Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9307006","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":"2026-07-04T15:55:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M2/Pl5g3n3Kh4OwY6pb1x1ZxfHYSrjVTkNxj5c3WmZ8B6AhQ4ULDWcqqbK3Eh2uBwSwoXoAdFnnyUa7rQRYuBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-22T05:53:29.472358Z"},"content_sha256":"8fb36afa0bd226d6de40e550dedc47c56e9f8f55e46d5be172a4833e15237d5d","schema_version":"1.0","event_id":"sha256:8fb36afa0bd226d6de40e550dedc47c56e9f8f55e46d5be172a4833e15237d5d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1993:WHDMMWYL6PZIOQN33GYOVCEMXE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Local Galaxy Density and the Arm Class of Spiral Galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"F. Mardirossian, G. Giuricin, M. Mezzetti, P. Monaco","submitted_at":"1993-07-05T15:34:02Z","abstract_excerpt":"We have examined the effect of the environmental density on the arm classification of an extensive sample of spiral galaxies included in the Nearby Galaxy Catalog (Tully, 1988a). We have also explored the dependence of the arm class of a galaxy on other factors, such as its blue absolute magnitude and its disk-to-total mass ratio, inferred in the literature either from the gradient of a good galaxy rotation curve or from a photometric mass decomposition method. We have found that the arm class is strongly related to the absolute magnitude in the mid-type spirals (in the sense that grand design"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9307006","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/astro-ph/9307006/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":"2026-07-04T15:55:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EYdlb9MjF3BWmsdgkHtkalwGRQozsXgaTZPg4xn1Pr2v5Ak2/DnQQ8bAzWCit6nIJHAK6gfvt1i979NK9Vo1DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-22T05:53:29.472740Z"},"content_sha256":"d5c4f1ce8c38cbf7d95a896a44b1f1b86e433d9c24e5a89582d100388ad0de4f","schema_version":"1.0","event_id":"sha256:d5c4f1ce8c38cbf7d95a896a44b1f1b86e433d9c24e5a89582d100388ad0de4f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WHDMMWYL6PZIOQN33GYOVCEMXE/bundle.json","state_url":"https://pith.science/pith/WHDMMWYL6PZIOQN33GYOVCEMXE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WHDMMWYL6PZIOQN33GYOVCEMXE/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":"2026-07-22T05:53:29Z","links":{"resolver":"https://pith.science/pith/WHDMMWYL6PZIOQN33GYOVCEMXE","bundle":"https://pith.science/pith/WHDMMWYL6PZIOQN33GYOVCEMXE/bundle.json","state":"https://pith.science/pith/WHDMMWYL6PZIOQN33GYOVCEMXE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WHDMMWYL6PZIOQN33GYOVCEMXE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1993:WHDMMWYL6PZIOQN33GYOVCEMXE","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":"c2bb8beca8e39c79d6d3ad85b60c5a34e8a43c80c6f395cdbff933f2e518775f","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1993-07-05T15:34:02Z","title_canon_sha256":"4321d31835884be12d686fa96c37b71fedda1054f10d714424864770ac7b81b9"},"schema_version":"1.0","source":{"id":"astro-ph/9307006","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9307006","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9307006v1","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9307006","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"pith_short_12","alias_value":"WHDMMWYL6PZI","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"pith_short_16","alias_value":"WHDMMWYL6PZIOQN3","created_at":"2026-07-04T15:55:06Z"},{"alias_kind":"pith_short_8","alias_value":"WHDMMWYL","created_at":"2026-07-04T15:55:06Z"}],"graph_snapshots":[{"event_id":"sha256:d5c4f1ce8c38cbf7d95a896a44b1f1b86e433d9c24e5a89582d100388ad0de4f","target":"graph","created_at":"2026-07-04T15:55:06Z","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/astro-ph/9307006/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have examined the effect of the environmental density on the arm classification of an extensive sample of spiral galaxies included in the Nearby Galaxy Catalog (Tully, 1988a). We have also explored the dependence of the arm class of a galaxy on other factors, such as its blue absolute magnitude and its disk-to-total mass ratio, inferred in the literature either from the gradient of a good galaxy rotation curve or from a photometric mass decomposition method. We have found that the arm class is strongly related to the absolute magnitude in the mid-type spirals (in the sense that grand design","authors_text":"F. Mardirossian, G. Giuricin, M. Mezzetti, P. Monaco","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1993-07-05T15:34:02Z","title":"The Local Galaxy Density and the Arm Class of Spiral Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9307006","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":"sha256:8fb36afa0bd226d6de40e550dedc47c56e9f8f55e46d5be172a4833e15237d5d","target":"record","created_at":"2026-07-04T15:55:06Z","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":"c2bb8beca8e39c79d6d3ad85b60c5a34e8a43c80c6f395cdbff933f2e518775f","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1993-07-05T15:34:02Z","title_canon_sha256":"4321d31835884be12d686fa96c37b71fedda1054f10d714424864770ac7b81b9"},"schema_version":"1.0","source":{"id":"astro-ph/9307006","kind":"arxiv","version":1}},"canonical_sha256":"b1c6c65b0bf3f28741bbd9b0ea888cb90bbf3758f9d7e7c1713b468d9fdac540","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b1c6c65b0bf3f28741bbd9b0ea888cb90bbf3758f9d7e7c1713b468d9fdac540","first_computed_at":"2026-07-04T15:55:06.973770Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:55:06.973770Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"w1aKT33u+iqrH1PVuJ/vLQQ26E5Oe7/vLa+ZBi0ceDtGMk4nSZM6k1kfRCXOn/GRvVi+n6ZZSRauwQn/MvG2Cg==","signature_status":"signed_v1","signed_at":"2026-07-04T15:55:06.974194Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9307006","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8fb36afa0bd226d6de40e550dedc47c56e9f8f55e46d5be172a4833e15237d5d","sha256:d5c4f1ce8c38cbf7d95a896a44b1f1b86e433d9c24e5a89582d100388ad0de4f"],"state_sha256":"7131128bdc9e92331e6e121835dcd01f9678a46084382a2ed7e2e46f15b28a38"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b28LYnusfz8Wfm5x0yNCWlqn+CyVfN6xsLj/0G1cMUUR9emv/greY1vPKG7IYN3CFwvqnzAA8kwRHEgbfRC+DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-22T05:53:29.475428Z","bundle_sha256":"9f9b802150bb7371748522896bb3486c2470a4815875febb6a698da07cf5f366"}}