{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:TZV5UBQVW5XNUHEACP7MIXBXZ2","short_pith_number":"pith:TZV5UBQV","canonical_record":{"source":{"id":"2605.28962","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2026-05-27T18:07:21Z","cross_cats_sorted":[],"title_canon_sha256":"8ede49770d9ce596955fb7a4a2fe22dd10e8f4969bc0e9b52279975d75ab462d","abstract_canon_sha256":"5298f352ff65ff3f572866462a5365185338500449804db447e0627f330c8487"},"schema_version":"1.0"},"canonical_sha256":"9e6bda0615b76eda1c8013fec45c37ce998283f3d0f8d6a21a6f1b9b2157a118","source":{"kind":"arxiv","id":"2605.28962","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.28962","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"arxiv_version","alias_value":"2605.28962v1","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.28962","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"pith_short_12","alias_value":"TZV5UBQVW5XN","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"pith_short_16","alias_value":"TZV5UBQVW5XNUHEA","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"pith_short_8","alias_value":"TZV5UBQV","created_at":"2026-05-29T01:04:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:TZV5UBQVW5XNUHEACP7MIXBXZ2","target":"record","payload":{"canonical_record":{"source":{"id":"2605.28962","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2026-05-27T18:07:21Z","cross_cats_sorted":[],"title_canon_sha256":"8ede49770d9ce596955fb7a4a2fe22dd10e8f4969bc0e9b52279975d75ab462d","abstract_canon_sha256":"5298f352ff65ff3f572866462a5365185338500449804db447e0627f330c8487"},"schema_version":"1.0"},"canonical_sha256":"9e6bda0615b76eda1c8013fec45c37ce998283f3d0f8d6a21a6f1b9b2157a118","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-29T01:04:41.702138Z","signature_b64":"FGJqHUDwJpvfnOoFDKllfvuWF8IbWE8Ys0YeNzr1ZdJk+uYpj+LFjnVeHKXBYyksj1g9t0/RCqw7CSjQbuX9Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9e6bda0615b76eda1c8013fec45c37ce998283f3d0f8d6a21a6f1b9b2157a118","last_reissued_at":"2026-05-29T01:04:41.701702Z","signature_status":"signed_v1","first_computed_at":"2026-05-29T01:04:41.701702Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.28962","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":"2026-05-29T01:04:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UwMYvlqMpL/B+06MpXmXdW8/rzNp0zj5qyUwrEEA4NjU4TpeB+prAYcbj4C7/8id82k0enpHlJlmUTQooAGvBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T10:41:54.564274Z"},"content_sha256":"502d4fe86e1e639b388bc10dee1775a59e36f68b1cfe57b6efb7a8de4dcf3897","schema_version":"1.0","event_id":"sha256:502d4fe86e1e639b388bc10dee1775a59e36f68b1cfe57b6efb7a8de4dcf3897"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:TZV5UBQVW5XNUHEACP7MIXBXZ2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Resolving Endpoint Underfitting in Diffusion Bridges via Noise Alignment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Congying Han, Tiande Guo, Xinmin Qiu, Yurong Gao, Zicheng Zhang","submitted_at":"2026-05-27T18:07:21Z","abstract_excerpt":"Diffusion bridge models offer a powerful framework for connecting two data distributions, such as in image restoration and translation. Many existing methods learn this bridge by mimicking the score-matching formulation of standard diffusion models. In this work, we find that this way leads to an anomalous underfitting phenomenon near the target endpoint, as the process approaches the target distribution ($t \\to 0$). This underfitting, characterized by significant drift in the predicted variance and direction, results from an excessively large discrepancy in noise levels between the network's "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.28962","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/2605.28962/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":"2026-05-29T01:04:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Rdddc7FY0elrWYLs23wIMskT9FSmv7fih4R6RTE9b9WUrmdOjrlVIW7fCHQIQOI+YdpIcr3pXdma3ETGWciXBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T10:41:54.565047Z"},"content_sha256":"211b08b6d0a5c0c8331632c1e78c841f55ca57d03789a4e83ffdd2df12103b50","schema_version":"1.0","event_id":"sha256:211b08b6d0a5c0c8331632c1e78c841f55ca57d03789a4e83ffdd2df12103b50"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TZV5UBQVW5XNUHEACP7MIXBXZ2/bundle.json","state_url":"https://pith.science/pith/TZV5UBQVW5XNUHEACP7MIXBXZ2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TZV5UBQVW5XNUHEACP7MIXBXZ2/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":"2026-05-31T10:41:54Z","links":{"resolver":"https://pith.science/pith/TZV5UBQVW5XNUHEACP7MIXBXZ2","bundle":"https://pith.science/pith/TZV5UBQVW5XNUHEACP7MIXBXZ2/bundle.json","state":"https://pith.science/pith/TZV5UBQVW5XNUHEACP7MIXBXZ2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TZV5UBQVW5XNUHEACP7MIXBXZ2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:TZV5UBQVW5XNUHEACP7MIXBXZ2","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":"5298f352ff65ff3f572866462a5365185338500449804db447e0627f330c8487","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2026-05-27T18:07:21Z","title_canon_sha256":"8ede49770d9ce596955fb7a4a2fe22dd10e8f4969bc0e9b52279975d75ab462d"},"schema_version":"1.0","source":{"id":"2605.28962","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.28962","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"arxiv_version","alias_value":"2605.28962v1","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.28962","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"pith_short_12","alias_value":"TZV5UBQVW5XN","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"pith_short_16","alias_value":"TZV5UBQVW5XNUHEA","created_at":"2026-05-29T01:04:41Z"},{"alias_kind":"pith_short_8","alias_value":"TZV5UBQV","created_at":"2026-05-29T01:04:41Z"}],"graph_snapshots":[{"event_id":"sha256:211b08b6d0a5c0c8331632c1e78c841f55ca57d03789a4e83ffdd2df12103b50","target":"graph","created_at":"2026-05-29T01:04:41Z","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/2605.28962/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Diffusion bridge models offer a powerful framework for connecting two data distributions, such as in image restoration and translation. Many existing methods learn this bridge by mimicking the score-matching formulation of standard diffusion models. In this work, we find that this way leads to an anomalous underfitting phenomenon near the target endpoint, as the process approaches the target distribution ($t \\to 0$). This underfitting, characterized by significant drift in the predicted variance and direction, results from an excessively large discrepancy in noise levels between the network's ","authors_text":"Congying Han, Tiande Guo, Xinmin Qiu, Yurong Gao, Zicheng Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2026-05-27T18:07:21Z","title":"Resolving Endpoint Underfitting in Diffusion Bridges via Noise Alignment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.28962","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":"sha256:502d4fe86e1e639b388bc10dee1775a59e36f68b1cfe57b6efb7a8de4dcf3897","target":"record","created_at":"2026-05-29T01:04:41Z","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":"5298f352ff65ff3f572866462a5365185338500449804db447e0627f330c8487","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2026-05-27T18:07:21Z","title_canon_sha256":"8ede49770d9ce596955fb7a4a2fe22dd10e8f4969bc0e9b52279975d75ab462d"},"schema_version":"1.0","source":{"id":"2605.28962","kind":"arxiv","version":1}},"canonical_sha256":"9e6bda0615b76eda1c8013fec45c37ce998283f3d0f8d6a21a6f1b9b2157a118","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9e6bda0615b76eda1c8013fec45c37ce998283f3d0f8d6a21a6f1b9b2157a118","first_computed_at":"2026-05-29T01:04:41.701702Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-29T01:04:41.701702Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FGJqHUDwJpvfnOoFDKllfvuWF8IbWE8Ys0YeNzr1ZdJk+uYpj+LFjnVeHKXBYyksj1g9t0/RCqw7CSjQbuX9Dg==","signature_status":"signed_v1","signed_at":"2026-05-29T01:04:41.702138Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.28962","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:502d4fe86e1e639b388bc10dee1775a59e36f68b1cfe57b6efb7a8de4dcf3897","sha256:211b08b6d0a5c0c8331632c1e78c841f55ca57d03789a4e83ffdd2df12103b50"],"state_sha256":"c099f72c51ee6f7b49c14f5e6440145354acff6690c65d3025a56f86e5643a8b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U6+8GWPTezH/abBoS8WlEYOueAcqtLfgtsEe1EyPdHSp0InvkJOdzUtsKyYmCkVxYN8jHr/x3rFxNAmu2kWCCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T10:41:54.567824Z","bundle_sha256":"ace9ba151779f68f1d50cce72ab3afd9b68cc9070860e426f5031357d43930af"}}