{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:DVYY6LGHNBNVCKNPGLBWQ5SMVT","short_pith_number":"pith:DVYY6LGH","canonical_record":{"source":{"id":"2107.02270","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2021-07-05T21:10:48Z","cross_cats_sorted":[],"title_canon_sha256":"6004693ee1a74be5ca4b601cd4eaf866c8e870a891a6d16c61d1a41c21b9cd46","abstract_canon_sha256":"3553e6f9990c5dfc790c1ac30635d837cec8a188ac11b92d4bcaa44e02ff2fa7"},"schema_version":"1.0"},"canonical_sha256":"1d718f2cc7685b5129af32c368764cacdc53898f544e6474f4088f3b1fc19d3e","source":{"kind":"arxiv","id":"2107.02270","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.02270","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"arxiv_version","alias_value":"2107.02270v3","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.02270","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"pith_short_12","alias_value":"DVYY6LGHNBNV","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"pith_short_16","alias_value":"DVYY6LGHNBNVCKNP","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"pith_short_8","alias_value":"DVYY6LGH","created_at":"2026-07-05T07:50:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:DVYY6LGHNBNVCKNPGLBWQ5SMVT","target":"record","payload":{"canonical_record":{"source":{"id":"2107.02270","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2021-07-05T21:10:48Z","cross_cats_sorted":[],"title_canon_sha256":"6004693ee1a74be5ca4b601cd4eaf866c8e870a891a6d16c61d1a41c21b9cd46","abstract_canon_sha256":"3553e6f9990c5dfc790c1ac30635d837cec8a188ac11b92d4bcaa44e02ff2fa7"},"schema_version":"1.0"},"canonical_sha256":"1d718f2cc7685b5129af32c368764cacdc53898f544e6474f4088f3b1fc19d3e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:50:17.800053Z","signature_b64":"a5w11qyPjvHyT/pCUtmtYSvBU9qNVLNIEgd/FPj5xjUYh1R+mEh2mXHB7AxDr4Zjy5lwKrTX4hghtyrOhvSQCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1d718f2cc7685b5129af32c368764cacdc53898f544e6474f4088f3b1fc19d3e","last_reissued_at":"2026-07-05T07:50:17.799649Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:50:17.799649Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.02270","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":"2026-07-05T07:50:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/fG40ZvS1D3C+iV9QcW0pIRlkSAiFpEXUpd8Z22mQY+66LAc2muDjOSXicU75wyYIrahA4XvcvQSQItRU1s7Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T21:42:07.598673Z"},"content_sha256":"20d3e2289bc9af8b5ffdd4810646b55fb2fa372705dd3643d2ce18cef47f5a6c","schema_version":"1.0","event_id":"sha256:20d3e2289bc9af8b5ffdd4810646b55fb2fa372705dd3643d2ce18cef47f5a6c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:DVYY6LGHNBNVCKNPGLBWQ5SMVT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Accessible Color Sequences for Data Visualization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.GR","authors_text":"Matthew A. Petroff","submitted_at":"2021-07-05T21:10:48Z","abstract_excerpt":"Color sequences, ordered sets of colors for data visualization, that balance aesthetics with accessibility considerations are presented. In order to model aesthetic preference, data were collected with an online survey, and the results were used to train a machine-learning model. To ensure accessibility, this model was combined with minimum-perceptual-distance constraints, including for simulated color-vision deficiencies, as well as with minimum-lightness-distance constraints for grayscale printing, maximum-lightness constraints for maintaining contrast with a white background, and scores fro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.02270","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/2107.02270/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":"2026-07-05T07:50:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bfX9d9eu03hg6VgdIdtKlZ5K1WcftyzOIdS7Sog+B++UzWNuroljR4NNCsKeVeKk9BM66iQyZ68olMiZchsWDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T21:42:07.599355Z"},"content_sha256":"a6084daabaeda2b9ab33c6befadcebe066cb8b0d4438e72e982245135dc8e458","schema_version":"1.0","event_id":"sha256:a6084daabaeda2b9ab33c6befadcebe066cb8b0d4438e72e982245135dc8e458"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DVYY6LGHNBNVCKNPGLBWQ5SMVT/bundle.json","state_url":"https://pith.science/pith/DVYY6LGHNBNVCKNPGLBWQ5SMVT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DVYY6LGHNBNVCKNPGLBWQ5SMVT/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":"2026-08-17T21:42:07Z","links":{"resolver":"https://pith.science/pith/DVYY6LGHNBNVCKNPGLBWQ5SMVT","bundle":"https://pith.science/pith/DVYY6LGHNBNVCKNPGLBWQ5SMVT/bundle.json","state":"https://pith.science/pith/DVYY6LGHNBNVCKNPGLBWQ5SMVT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DVYY6LGHNBNVCKNPGLBWQ5SMVT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:DVYY6LGHNBNVCKNPGLBWQ5SMVT","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":"3553e6f9990c5dfc790c1ac30635d837cec8a188ac11b92d4bcaa44e02ff2fa7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2021-07-05T21:10:48Z","title_canon_sha256":"6004693ee1a74be5ca4b601cd4eaf866c8e870a891a6d16c61d1a41c21b9cd46"},"schema_version":"1.0","source":{"id":"2107.02270","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.02270","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"arxiv_version","alias_value":"2107.02270v3","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.02270","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"pith_short_12","alias_value":"DVYY6LGHNBNV","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"pith_short_16","alias_value":"DVYY6LGHNBNVCKNP","created_at":"2026-07-05T07:50:17Z"},{"alias_kind":"pith_short_8","alias_value":"DVYY6LGH","created_at":"2026-07-05T07:50:17Z"}],"graph_snapshots":[{"event_id":"sha256:a6084daabaeda2b9ab33c6befadcebe066cb8b0d4438e72e982245135dc8e458","target":"graph","created_at":"2026-07-05T07:50:17Z","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/2107.02270/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Color sequences, ordered sets of colors for data visualization, that balance aesthetics with accessibility considerations are presented. In order to model aesthetic preference, data were collected with an online survey, and the results were used to train a machine-learning model. To ensure accessibility, this model was combined with minimum-perceptual-distance constraints, including for simulated color-vision deficiencies, as well as with minimum-lightness-distance constraints for grayscale printing, maximum-lightness constraints for maintaining contrast with a white background, and scores fro","authors_text":"Matthew A. Petroff","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2021-07-05T21:10:48Z","title":"Accessible Color Sequences for Data Visualization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.02270","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":"sha256:20d3e2289bc9af8b5ffdd4810646b55fb2fa372705dd3643d2ce18cef47f5a6c","target":"record","created_at":"2026-07-05T07:50:17Z","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":"3553e6f9990c5dfc790c1ac30635d837cec8a188ac11b92d4bcaa44e02ff2fa7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2021-07-05T21:10:48Z","title_canon_sha256":"6004693ee1a74be5ca4b601cd4eaf866c8e870a891a6d16c61d1a41c21b9cd46"},"schema_version":"1.0","source":{"id":"2107.02270","kind":"arxiv","version":3}},"canonical_sha256":"1d718f2cc7685b5129af32c368764cacdc53898f544e6474f4088f3b1fc19d3e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1d718f2cc7685b5129af32c368764cacdc53898f544e6474f4088f3b1fc19d3e","first_computed_at":"2026-07-05T07:50:17.799649Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:50:17.799649Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"a5w11qyPjvHyT/pCUtmtYSvBU9qNVLNIEgd/FPj5xjUYh1R+mEh2mXHB7AxDr4Zjy5lwKrTX4hghtyrOhvSQCw==","signature_status":"signed_v1","signed_at":"2026-07-05T07:50:17.800053Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.02270","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:20d3e2289bc9af8b5ffdd4810646b55fb2fa372705dd3643d2ce18cef47f5a6c","sha256:a6084daabaeda2b9ab33c6befadcebe066cb8b0d4438e72e982245135dc8e458"],"state_sha256":"ee97959a44590681c7e3551260df18e69a3226463deb30cdd98dedd06da57b67"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yNmPeZL2aeZDyM9vH8bIEIBaRF3aE8Ia/KrJNiP2zIF5Y/Ma5E8+eCCS/m7QybxbK97gcHI/e9PlVr0wZgKiAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T21:42:07.606546Z","bundle_sha256":"196593a645dfab1968aa152aac45dc5ff8a8df43eab5345e7b4134a3e27cca18"}}