{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:RRQQG2EKHRHYRAW3A7R3NSRU7K","short_pith_number":"pith:RRQQG2EK","canonical_record":{"source":{"id":"2601.20259","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-01-28T05:13:54Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"139eaa94f96d5078cef7f316da3d4c4d77f030d0bed0c7934c923c34fb4831a2","abstract_canon_sha256":"478f7b0c9ff545493aa25648dfcebb8b9eb204c00e4d18175ae2921876d0662f"},"schema_version":"1.0"},"canonical_sha256":"8c6103688a3c4f8882db07e3b6ca34faab4eb2021d0ebae5930db498ed43a86e","source":{"kind":"arxiv","id":"2601.20259","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2601.20259","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"arxiv_version","alias_value":"2601.20259v2","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.20259","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"pith_short_12","alias_value":"RRQQG2EKHRHY","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"pith_short_16","alias_value":"RRQQG2EKHRHYRAW3","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"pith_short_8","alias_value":"RRQQG2EK","created_at":"2026-06-04T01:08:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:RRQQG2EKHRHYRAW3A7R3NSRU7K","target":"record","payload":{"canonical_record":{"source":{"id":"2601.20259","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-01-28T05:13:54Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"139eaa94f96d5078cef7f316da3d4c4d77f030d0bed0c7934c923c34fb4831a2","abstract_canon_sha256":"478f7b0c9ff545493aa25648dfcebb8b9eb204c00e4d18175ae2921876d0662f"},"schema_version":"1.0"},"canonical_sha256":"8c6103688a3c4f8882db07e3b6ca34faab4eb2021d0ebae5930db498ed43a86e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-04T01:08:40.650486Z","signature_b64":"5yBW7kKpROuWoqqVii9NuknQRetbvX3vn7jWepvHmXD+7QuPktbZEmNVaSywfIJP3l2V1PofDjJH+F75oV1tAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8c6103688a3c4f8882db07e3b6ca34faab4eb2021d0ebae5930db498ed43a86e","last_reissued_at":"2026-06-04T01:08:40.649632Z","signature_status":"signed_v1","first_computed_at":"2026-06-04T01:08:40.649632Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2601.20259","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":"2026-06-04T01:08:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QlIixvdY0BWNO27kblAAmewWd2IY+ryxA+oU4geO7H88pq5UV7htUPttJQes/WSIQyFxMbAT+9F9+ZTBePIvBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T02:02:02.085687Z"},"content_sha256":"c17f2d68e799869a8041a600db5552b72927c53c89abed8f9a95dfc6194d7694","schema_version":"1.0","event_id":"sha256:c17f2d68e799869a8041a600db5552b72927c53c89abed8f9a95dfc6194d7694"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:RRQQG2EKHRHYRAW3A7R3NSRU7K","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Roles of individual pigments in ultrafast excitation dynamics of light-harvesting phycobiliproteins revealed by recombinant techniques and two-dimensional electronic spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"physics.bio-ph","authors_text":"Masaaki Tsubouchi, Motoyasu Adachi, Ryuji Itakura, Takatoshi Fujita","submitted_at":"2026-01-28T05:13:54Z","abstract_excerpt":"Phycobiliproteins serve as highly efficient light-harvesting antennae in cyanobacteria, yet the molecular factors governing their ultrafast energy relaxation and coherence dynamics remain incompletely understood. In this study, we investigate the role of pigment arrangement and pigment-protein interactions by combining recombinant protein engineering with two-dimensional electronic spectroscopy (2D-ES). In addition to wild-type allophycocyanin (APC) and C-phycocyanin (CPC), we artificially synthesized a {\\beta}153 phycocyanobilin (PCB)-deficient CPC mutant, enabling direct experimental isolati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.20259","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/2601.20259/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":"2026-06-04T01:08:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U0zeVr/zXMbXauXdHC+Ywar8og5TFazQ72cERCAe1HbzBWyDwIlxPpWkbnH4CKPi6iWAD1KnD+VVpk2o1fUZBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T02:02:02.086395Z"},"content_sha256":"191b782689e00eb060eb4a0a14c4190d49dd16b1ef9909a2e70a7cc8a3942a61","schema_version":"1.0","event_id":"sha256:191b782689e00eb060eb4a0a14c4190d49dd16b1ef9909a2e70a7cc8a3942a61"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RRQQG2EKHRHYRAW3A7R3NSRU7K/bundle.json","state_url":"https://pith.science/pith/RRQQG2EKHRHYRAW3A7R3NSRU7K/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RRQQG2EKHRHYRAW3A7R3NSRU7K/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":"2026-06-05T02:02:02Z","links":{"resolver":"https://pith.science/pith/RRQQG2EKHRHYRAW3A7R3NSRU7K","bundle":"https://pith.science/pith/RRQQG2EKHRHYRAW3A7R3NSRU7K/bundle.json","state":"https://pith.science/pith/RRQQG2EKHRHYRAW3A7R3NSRU7K/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RRQQG2EKHRHYRAW3A7R3NSRU7K/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:RRQQG2EKHRHYRAW3A7R3NSRU7K","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":"478f7b0c9ff545493aa25648dfcebb8b9eb204c00e4d18175ae2921876d0662f","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-01-28T05:13:54Z","title_canon_sha256":"139eaa94f96d5078cef7f316da3d4c4d77f030d0bed0c7934c923c34fb4831a2"},"schema_version":"1.0","source":{"id":"2601.20259","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2601.20259","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"arxiv_version","alias_value":"2601.20259v2","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.20259","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"pith_short_12","alias_value":"RRQQG2EKHRHY","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"pith_short_16","alias_value":"RRQQG2EKHRHYRAW3","created_at":"2026-06-04T01:08:40Z"},{"alias_kind":"pith_short_8","alias_value":"RRQQG2EK","created_at":"2026-06-04T01:08:40Z"}],"graph_snapshots":[{"event_id":"sha256:191b782689e00eb060eb4a0a14c4190d49dd16b1ef9909a2e70a7cc8a3942a61","target":"graph","created_at":"2026-06-04T01:08:40Z","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/2601.20259/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Phycobiliproteins serve as highly efficient light-harvesting antennae in cyanobacteria, yet the molecular factors governing their ultrafast energy relaxation and coherence dynamics remain incompletely understood. In this study, we investigate the role of pigment arrangement and pigment-protein interactions by combining recombinant protein engineering with two-dimensional electronic spectroscopy (2D-ES). In addition to wild-type allophycocyanin (APC) and C-phycocyanin (CPC), we artificially synthesized a {\\beta}153 phycocyanobilin (PCB)-deficient CPC mutant, enabling direct experimental isolati","authors_text":"Masaaki Tsubouchi, Motoyasu Adachi, Ryuji Itakura, Takatoshi Fujita","cross_cats":["physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-01-28T05:13:54Z","title":"Roles of individual pigments in ultrafast excitation dynamics of light-harvesting phycobiliproteins revealed by recombinant techniques and two-dimensional electronic spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.20259","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:c17f2d68e799869a8041a600db5552b72927c53c89abed8f9a95dfc6194d7694","target":"record","created_at":"2026-06-04T01:08:40Z","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":"478f7b0c9ff545493aa25648dfcebb8b9eb204c00e4d18175ae2921876d0662f","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-01-28T05:13:54Z","title_canon_sha256":"139eaa94f96d5078cef7f316da3d4c4d77f030d0bed0c7934c923c34fb4831a2"},"schema_version":"1.0","source":{"id":"2601.20259","kind":"arxiv","version":2}},"canonical_sha256":"8c6103688a3c4f8882db07e3b6ca34faab4eb2021d0ebae5930db498ed43a86e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8c6103688a3c4f8882db07e3b6ca34faab4eb2021d0ebae5930db498ed43a86e","first_computed_at":"2026-06-04T01:08:40.649632Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-04T01:08:40.649632Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5yBW7kKpROuWoqqVii9NuknQRetbvX3vn7jWepvHmXD+7QuPktbZEmNVaSywfIJP3l2V1PofDjJH+F75oV1tAA==","signature_status":"signed_v1","signed_at":"2026-06-04T01:08:40.650486Z","signed_message":"canonical_sha256_bytes"},"source_id":"2601.20259","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c17f2d68e799869a8041a600db5552b72927c53c89abed8f9a95dfc6194d7694","sha256:191b782689e00eb060eb4a0a14c4190d49dd16b1ef9909a2e70a7cc8a3942a61"],"state_sha256":"03a3396acd3b4413c27326ef768d5d23917254f034a95690fa24e0545e16c80c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qSTVRbW783laT3MWoigmaYRmyyde2ksBdXnIXrkkT5RPNeJoA0Was4o/aLEVTS3JSM0RkeNH2egWWIems1xOCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T02:02:02.090331Z","bundle_sha256":"9ab770e507bf6836be4504cc36c1492ef0645b9dd8acc48a913a5ef2f87bef8e"}}