{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:WEYVRKHPNQFP7JQAMURKNEAMKX","short_pith_number":"pith:WEYVRKHP","canonical_record":{"source":{"id":"2104.07636","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-04-15T17:50:42Z","cross_cats_sorted":["cs.CV","cs.LG"],"title_canon_sha256":"406422429bc1abfe4296166e9e978145c4f1a03318d5cbc3669f415085de60a9","abstract_canon_sha256":"ad16d13f9829116a25f2ec862bac36cc750c1116b5a95f67d8f989c0db4caa61"},"schema_version":"1.0"},"canonical_sha256":"b13158a8ef6c0affa6006522a6900c55ceab2b7b6adcbcebdf5b74d4dbe3811b","source":{"kind":"arxiv","id":"2104.07636","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.07636","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"arxiv_version","alias_value":"2104.07636v2","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.07636","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"pith_short_12","alias_value":"WEYVRKHPNQFP","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"pith_short_16","alias_value":"WEYVRKHPNQFP7JQA","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"pith_short_8","alias_value":"WEYVRKHP","created_at":"2026-07-05T02:53:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:WEYVRKHPNQFP7JQAMURKNEAMKX","target":"record","payload":{"canonical_record":{"source":{"id":"2104.07636","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-04-15T17:50:42Z","cross_cats_sorted":["cs.CV","cs.LG"],"title_canon_sha256":"406422429bc1abfe4296166e9e978145c4f1a03318d5cbc3669f415085de60a9","abstract_canon_sha256":"ad16d13f9829116a25f2ec862bac36cc750c1116b5a95f67d8f989c0db4caa61"},"schema_version":"1.0"},"canonical_sha256":"b13158a8ef6c0affa6006522a6900c55ceab2b7b6adcbcebdf5b74d4dbe3811b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:53:56.967928Z","signature_b64":"fHgBeqedD3DTcDxgdjEc48lNoqOIKuHpYMCAHhFlwrFkbEc87L1vsdQaj+da1FvJyMnR54b+BJnsZOZAF3d7Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b13158a8ef6c0affa6006522a6900c55ceab2b7b6adcbcebdf5b74d4dbe3811b","last_reissued_at":"2026-07-05T02:53:56.967444Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:53:56.967444Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.07636","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":"2026-07-05T02:53:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QopnmsP6Dcl3gPLmOgPj2G4KrRoikzU4YKc4zwj+SW7tD90tHzrHzR7HMQMyHvRZ08Gggz5qoh8Q/VLnNzOuDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T03:58:49.189907Z"},"content_sha256":"1543f1fca7847c857e36df37c0e96b4ef07c85cbeaff388a0bbf8cc5a6e119b6","schema_version":"1.0","event_id":"sha256:1543f1fca7847c857e36df37c0e96b4ef07c85cbeaff388a0bbf8cc5a6e119b6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:WEYVRKHPNQFP7JQAMURKNEAMKX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Image Super-Resolution via Iterative Refinement","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CV","cs.LG"],"primary_cat":"eess.IV","authors_text":"Chitwan Saharia, David J. Fleet, Jonathan Ho, Mohammad Norouzi, Tim Salimans, William Chan","submitted_at":"2021-04-15T17:50:42Z","abstract_excerpt":"We present SR3, an approach to image Super-Resolution via Repeated Refinement. SR3 adapts denoising diffusion probabilistic models to conditional image generation and performs super-resolution through a stochastic denoising process. Inference starts with pure Gaussian noise and iteratively refines the noisy output using a U-Net model trained on denoising at various noise levels. SR3 exhibits strong performance on super-resolution tasks at different magnification factors, on faces and natural images. We conduct human evaluation on a standard 8X face super-resolution task on CelebA-HQ, comparing"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.07636","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2104.07636/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":"2026-07-05T02:53:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vC4jqMcta3I7p2XZ1bDQtAwa03zaPirwctZI30q/RRssVb3TKR/Y4WUgbT/4jDThEtJCxpA1jDzjiUGEUgTuCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T03:58:49.190403Z"},"content_sha256":"43573b2367c020c3bb00ef88b7576c60b7bec9c86c088e44723c4029928d5145","schema_version":"1.0","event_id":"sha256:43573b2367c020c3bb00ef88b7576c60b7bec9c86c088e44723c4029928d5145"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WEYVRKHPNQFP7JQAMURKNEAMKX/bundle.json","state_url":"https://pith.science/pith/WEYVRKHPNQFP7JQAMURKNEAMKX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WEYVRKHPNQFP7JQAMURKNEAMKX/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":"2026-08-09T03:58:49Z","links":{"resolver":"https://pith.science/pith/WEYVRKHPNQFP7JQAMURKNEAMKX","bundle":"https://pith.science/pith/WEYVRKHPNQFP7JQAMURKNEAMKX/bundle.json","state":"https://pith.science/pith/WEYVRKHPNQFP7JQAMURKNEAMKX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WEYVRKHPNQFP7JQAMURKNEAMKX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:WEYVRKHPNQFP7JQAMURKNEAMKX","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":"ad16d13f9829116a25f2ec862bac36cc750c1116b5a95f67d8f989c0db4caa61","cross_cats_sorted":["cs.CV","cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-04-15T17:50:42Z","title_canon_sha256":"406422429bc1abfe4296166e9e978145c4f1a03318d5cbc3669f415085de60a9"},"schema_version":"1.0","source":{"id":"2104.07636","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.07636","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"arxiv_version","alias_value":"2104.07636v2","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.07636","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"pith_short_12","alias_value":"WEYVRKHPNQFP","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"pith_short_16","alias_value":"WEYVRKHPNQFP7JQA","created_at":"2026-07-05T02:53:56Z"},{"alias_kind":"pith_short_8","alias_value":"WEYVRKHP","created_at":"2026-07-05T02:53:56Z"}],"graph_snapshots":[{"event_id":"sha256:43573b2367c020c3bb00ef88b7576c60b7bec9c86c088e44723c4029928d5145","target":"graph","created_at":"2026-07-05T02:53:56Z","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/2104.07636/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present SR3, an approach to image Super-Resolution via Repeated Refinement. SR3 adapts denoising diffusion probabilistic models to conditional image generation and performs super-resolution through a stochastic denoising process. Inference starts with pure Gaussian noise and iteratively refines the noisy output using a U-Net model trained on denoising at various noise levels. SR3 exhibits strong performance on super-resolution tasks at different magnification factors, on faces and natural images. We conduct human evaluation on a standard 8X face super-resolution task on CelebA-HQ, comparing","authors_text":"Chitwan Saharia, David J. Fleet, Jonathan Ho, Mohammad Norouzi, Tim Salimans, William Chan","cross_cats":["cs.CV","cs.LG"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-04-15T17:50:42Z","title":"Image Super-Resolution via Iterative Refinement"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.07636","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":"sha256:1543f1fca7847c857e36df37c0e96b4ef07c85cbeaff388a0bbf8cc5a6e119b6","target":"record","created_at":"2026-07-05T02:53:56Z","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":"ad16d13f9829116a25f2ec862bac36cc750c1116b5a95f67d8f989c0db4caa61","cross_cats_sorted":["cs.CV","cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-04-15T17:50:42Z","title_canon_sha256":"406422429bc1abfe4296166e9e978145c4f1a03318d5cbc3669f415085de60a9"},"schema_version":"1.0","source":{"id":"2104.07636","kind":"arxiv","version":2}},"canonical_sha256":"b13158a8ef6c0affa6006522a6900c55ceab2b7b6adcbcebdf5b74d4dbe3811b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b13158a8ef6c0affa6006522a6900c55ceab2b7b6adcbcebdf5b74d4dbe3811b","first_computed_at":"2026-07-05T02:53:56.967444Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:53:56.967444Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fHgBeqedD3DTcDxgdjEc48lNoqOIKuHpYMCAHhFlwrFkbEc87L1vsdQaj+da1FvJyMnR54b+BJnsZOZAF3d7Cw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:53:56.967928Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.07636","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1543f1fca7847c857e36df37c0e96b4ef07c85cbeaff388a0bbf8cc5a6e119b6","sha256:43573b2367c020c3bb00ef88b7576c60b7bec9c86c088e44723c4029928d5145"],"state_sha256":"7d5a01e6bd8105dc7eba29ae3afea1811d6be34ad645135e15a096331040824b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nWGMA5IowwIAevpZX0Dwb3vfGYCOZJT9UDv6KqHQ7//G29z/VF7jDlcsJEmsjWNAHTFSqVqotIm74JzXLo2oCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T03:58:49.194698Z","bundle_sha256":"4c03d42321fc9642b88456d0fe9e76f775c4bbec6d19d48ec3fb857198cfc505"}}