{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:GS7CCHDB76Q5KDWLJTOPWFCXKQ","short_pith_number":"pith:GS7CCHDB","canonical_record":{"source":{"id":"1705.06086","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2017-05-17T10:59:29Z","cross_cats_sorted":[],"title_canon_sha256":"af78bed2892e1a39ac2fe9a0cf44f60ccdfcd05eb8819710b2f4eaf295755c1e","abstract_canon_sha256":"b293c9b223f61bb6cd5394ccf22a3730fd1ac139f973e954be375df6f2d4bb41"},"schema_version":"1.0"},"canonical_sha256":"34be211c61ffa1d50ecb4cdcfb1457541df49060b8c4b9be2026efe694f5b396","source":{"kind":"arxiv","id":"1705.06086","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.06086","created_at":"2026-05-18T00:44:19Z"},{"alias_kind":"arxiv_version","alias_value":"1705.06086v1","created_at":"2026-05-18T00:44:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.06086","created_at":"2026-05-18T00:44:19Z"},{"alias_kind":"pith_short_12","alias_value":"GS7CCHDB76Q5","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"GS7CCHDB76Q5KDWL","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"GS7CCHDB","created_at":"2026-05-18T12:31:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:GS7CCHDB76Q5KDWLJTOPWFCXKQ","target":"record","payload":{"canonical_record":{"source":{"id":"1705.06086","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2017-05-17T10:59:29Z","cross_cats_sorted":[],"title_canon_sha256":"af78bed2892e1a39ac2fe9a0cf44f60ccdfcd05eb8819710b2f4eaf295755c1e","abstract_canon_sha256":"b293c9b223f61bb6cd5394ccf22a3730fd1ac139f973e954be375df6f2d4bb41"},"schema_version":"1.0"},"canonical_sha256":"34be211c61ffa1d50ecb4cdcfb1457541df49060b8c4b9be2026efe694f5b396","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:44:19.051357Z","signature_b64":"oe9gNn6TzBlJmvy5uEMPMMIlbQtWeDVhZjkWZ4DpY/QUKgQMRGmuyKdWrQgJrsRUl0Skbifqxm06zHSia92HDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"34be211c61ffa1d50ecb4cdcfb1457541df49060b8c4b9be2026efe694f5b396","last_reissued_at":"2026-05-18T00:44:19.050842Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:44:19.050842Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.06086","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":"2026-05-18T00:44:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Iubage3MYNV/U5Sotf0K3BzbGlBEKJlml661J4eymyzqc69jZVGWxvzeOvsPzp0QdAV8JZIL1GCbmdDsjdsRCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T09:22:08.237691Z"},"content_sha256":"ccf3b3297a6dc18dcb9d129f883a62145ecef43901b3b1c0c3246b85e299da5e","schema_version":"1.0","event_id":"sha256:ccf3b3297a6dc18dcb9d129f883a62145ecef43901b3b1c0c3246b85e299da5e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:GS7CCHDB76Q5KDWLJTOPWFCXKQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Scratch iridescence: Wave-optical rendering of diffractive surface structure","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.GR","authors_text":"Matthias B. Hullin, Sebastian Werner, Wenzel Jakob, Zdravko Velinov","submitted_at":"2017-05-17T10:59:29Z","abstract_excerpt":"The surface of metal, glass and plastic objects is often characterized by microscopic scratches caused by manufacturing and/or wear. A closer look onto such scratches reveals iridescent colors with a complex dependency on viewing and lighting conditions. The physics behind this phenomenon is well understood; it is caused by diffraction of the incident light by surface features on the order of the optical wavelength. Existing analytic models are able to reproduce spatially unresolved microstructure such as the iridescent appearance of compact disks and similar materials. Spatially resolved scra"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.06086","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":"2026-05-18T00:44:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jh8a8gwF8kL5JJ2qLYpZcFQS4JOhwc58oBYu5fahIisK3+l7yjbwRnf7QfUU6roh2ZXreCG4YiGkAxu8NB77CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T09:22:08.238042Z"},"content_sha256":"0a18bfa9916a8cd31d2d89c4b75266a936fa55022738b43e4844dba92cce5e03","schema_version":"1.0","event_id":"sha256:0a18bfa9916a8cd31d2d89c4b75266a936fa55022738b43e4844dba92cce5e03"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GS7CCHDB76Q5KDWLJTOPWFCXKQ/bundle.json","state_url":"https://pith.science/pith/GS7CCHDB76Q5KDWLJTOPWFCXKQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GS7CCHDB76Q5KDWLJTOPWFCXKQ/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":"2026-05-28T09:22:08Z","links":{"resolver":"https://pith.science/pith/GS7CCHDB76Q5KDWLJTOPWFCXKQ","bundle":"https://pith.science/pith/GS7CCHDB76Q5KDWLJTOPWFCXKQ/bundle.json","state":"https://pith.science/pith/GS7CCHDB76Q5KDWLJTOPWFCXKQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GS7CCHDB76Q5KDWLJTOPWFCXKQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:GS7CCHDB76Q5KDWLJTOPWFCXKQ","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":"b293c9b223f61bb6cd5394ccf22a3730fd1ac139f973e954be375df6f2d4bb41","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2017-05-17T10:59:29Z","title_canon_sha256":"af78bed2892e1a39ac2fe9a0cf44f60ccdfcd05eb8819710b2f4eaf295755c1e"},"schema_version":"1.0","source":{"id":"1705.06086","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.06086","created_at":"2026-05-18T00:44:19Z"},{"alias_kind":"arxiv_version","alias_value":"1705.06086v1","created_at":"2026-05-18T00:44:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.06086","created_at":"2026-05-18T00:44:19Z"},{"alias_kind":"pith_short_12","alias_value":"GS7CCHDB76Q5","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"GS7CCHDB76Q5KDWL","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"GS7CCHDB","created_at":"2026-05-18T12:31:18Z"}],"graph_snapshots":[{"event_id":"sha256:0a18bfa9916a8cd31d2d89c4b75266a936fa55022738b43e4844dba92cce5e03","target":"graph","created_at":"2026-05-18T00:44:19Z","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 surface of metal, glass and plastic objects is often characterized by microscopic scratches caused by manufacturing and/or wear. A closer look onto such scratches reveals iridescent colors with a complex dependency on viewing and lighting conditions. The physics behind this phenomenon is well understood; it is caused by diffraction of the incident light by surface features on the order of the optical wavelength. Existing analytic models are able to reproduce spatially unresolved microstructure such as the iridescent appearance of compact disks and similar materials. Spatially resolved scra","authors_text":"Matthias B. Hullin, Sebastian Werner, Wenzel Jakob, Zdravko Velinov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2017-05-17T10:59:29Z","title":"Scratch iridescence: Wave-optical rendering of diffractive surface structure"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.06086","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:ccf3b3297a6dc18dcb9d129f883a62145ecef43901b3b1c0c3246b85e299da5e","target":"record","created_at":"2026-05-18T00:44:19Z","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":"b293c9b223f61bb6cd5394ccf22a3730fd1ac139f973e954be375df6f2d4bb41","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2017-05-17T10:59:29Z","title_canon_sha256":"af78bed2892e1a39ac2fe9a0cf44f60ccdfcd05eb8819710b2f4eaf295755c1e"},"schema_version":"1.0","source":{"id":"1705.06086","kind":"arxiv","version":1}},"canonical_sha256":"34be211c61ffa1d50ecb4cdcfb1457541df49060b8c4b9be2026efe694f5b396","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"34be211c61ffa1d50ecb4cdcfb1457541df49060b8c4b9be2026efe694f5b396","first_computed_at":"2026-05-18T00:44:19.050842Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:44:19.050842Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oe9gNn6TzBlJmvy5uEMPMMIlbQtWeDVhZjkWZ4DpY/QUKgQMRGmuyKdWrQgJrsRUl0Skbifqxm06zHSia92HDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:44:19.051357Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.06086","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ccf3b3297a6dc18dcb9d129f883a62145ecef43901b3b1c0c3246b85e299da5e","sha256:0a18bfa9916a8cd31d2d89c4b75266a936fa55022738b43e4844dba92cce5e03"],"state_sha256":"06b3c6eb5e026776a258a3c8923ffc87c9b9aaa8e04bc132c4ce527f1316cc83"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LrNRF3bWO1Z0RZiWzRnc1bfq9FgfdofZsq17IxQ7Hxg86tuxhiWuMZJm/kfSr5AXne/hVBAzRDdxYUlev3v2Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T09:22:08.240010Z","bundle_sha256":"6df9aea6f064fd3c7d5efb618bf237ddafaa593b8a613a3b7b1b15b6c8796f62"}}