{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:2R45JODUQL5BVCBHHICFBBXD52","short_pith_number":"pith:2R45JODU","canonical_record":{"source":{"id":"1608.04220","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-08-15T09:47:20Z","cross_cats_sorted":[],"title_canon_sha256":"165c040bd8f4e33515b56ad4e1f8bd800c147dcef9295809a1cd635b223dcebc","abstract_canon_sha256":"5bf9e72abad30b165a288af6b52e0f359795cd3617f4f107a5371ac1ba8122e9"},"schema_version":"1.0"},"canonical_sha256":"d479d4b87482fa1a88273a045086e3ee9ca4f37bb0f16fa86a1dd7ef89f44c4d","source":{"kind":"arxiv","id":"1608.04220","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.04220","created_at":"2026-05-18T01:01:30Z"},{"alias_kind":"arxiv_version","alias_value":"1608.04220v1","created_at":"2026-05-18T01:01:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.04220","created_at":"2026-05-18T01:01:30Z"},{"alias_kind":"pith_short_12","alias_value":"2R45JODUQL5B","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_16","alias_value":"2R45JODUQL5BVCBH","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_8","alias_value":"2R45JODU","created_at":"2026-05-18T12:29:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:2R45JODUQL5BVCBHHICFBBXD52","target":"record","payload":{"canonical_record":{"source":{"id":"1608.04220","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-08-15T09:47:20Z","cross_cats_sorted":[],"title_canon_sha256":"165c040bd8f4e33515b56ad4e1f8bd800c147dcef9295809a1cd635b223dcebc","abstract_canon_sha256":"5bf9e72abad30b165a288af6b52e0f359795cd3617f4f107a5371ac1ba8122e9"},"schema_version":"1.0"},"canonical_sha256":"d479d4b87482fa1a88273a045086e3ee9ca4f37bb0f16fa86a1dd7ef89f44c4d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:01:30.906917Z","signature_b64":"A6KoqVDGb/53mGxk4MZuDgYBIOGQuH6yDRf2wHdmoV1+tKUwdh66iCqe0RGkaY0kf4K1zsJZlQT9na2fb/8uBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d479d4b87482fa1a88273a045086e3ee9ca4f37bb0f16fa86a1dd7ef89f44c4d","last_reissued_at":"2026-05-18T01:01:30.906237Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:01:30.906237Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.04220","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":"2026-05-18T01:01:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pFqF7sDNGszEyY95gDKBwtNnyhyCdbi21gGZcdU3tt9zVBFf0lIXWMJp6PLIfpdwPxkGuAx9ay8ELJIXJfnbCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T18:58:16.578793Z"},"content_sha256":"6927c9492647ec4a826bc0652c439acb93b077bf12b2012197404f5543833791","schema_version":"1.0","event_id":"sha256:6927c9492647ec4a826bc0652c439acb93b077bf12b2012197404f5543833791"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:2R45JODUQL5BVCBHHICFBBXD52","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experimental transmission of quantum digital signatures over 90-km of installed optical fiber using a differential phase shift quantum key distribution system","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Erika Andersson, Gerald S. Buller, Kaoru Shimizu, Kiyoshi Tamaki, Masahide Sasaki, Masahiro Takeoka, Mikio Fujiwara, Robert J. Collins, Ryan Amiri, Toshimori Honjo","submitted_at":"2016-08-15T09:47:20Z","abstract_excerpt":"Quantum digital signatures apply quantum mechanics to the problem of guaranteeing message integrity and non-repudiation with information-theoretical security, which are complementary to the confidentiality realized by quantum key distribution. Previous experimental demonstrations have been limited to transmission distances of less than 5-km of optical fiber in a laboratory setting. Here we report the first demonstration of quantum digital signatures over installed optical fiber as well as the longest transmission link reported to date. This demonstration used a 90-km long differential phase sh"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.04220","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":"2026-05-18T01:01:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"867F1d9R+q7fktMRUTHQIYRU2VYO7GkG2iFPpCDhEJoymZZYoso13q7K9Jzg0Lpkmfmfam+f2ORy8LqU+AS3Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T18:58:16.579220Z"},"content_sha256":"155bb17a8ef9a07cd4dc2e43cc5af1a8fffb4d9826069430b22bffa3271a46b0","schema_version":"1.0","event_id":"sha256:155bb17a8ef9a07cd4dc2e43cc5af1a8fffb4d9826069430b22bffa3271a46b0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2R45JODUQL5BVCBHHICFBBXD52/bundle.json","state_url":"https://pith.science/pith/2R45JODUQL5BVCBHHICFBBXD52/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2R45JODUQL5BVCBHHICFBBXD52/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":"2026-06-08T18:58:16Z","links":{"resolver":"https://pith.science/pith/2R45JODUQL5BVCBHHICFBBXD52","bundle":"https://pith.science/pith/2R45JODUQL5BVCBHHICFBBXD52/bundle.json","state":"https://pith.science/pith/2R45JODUQL5BVCBHHICFBBXD52/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2R45JODUQL5BVCBHHICFBBXD52/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:2R45JODUQL5BVCBHHICFBBXD52","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":"5bf9e72abad30b165a288af6b52e0f359795cd3617f4f107a5371ac1ba8122e9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-08-15T09:47:20Z","title_canon_sha256":"165c040bd8f4e33515b56ad4e1f8bd800c147dcef9295809a1cd635b223dcebc"},"schema_version":"1.0","source":{"id":"1608.04220","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.04220","created_at":"2026-05-18T01:01:30Z"},{"alias_kind":"arxiv_version","alias_value":"1608.04220v1","created_at":"2026-05-18T01:01:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.04220","created_at":"2026-05-18T01:01:30Z"},{"alias_kind":"pith_short_12","alias_value":"2R45JODUQL5B","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_16","alias_value":"2R45JODUQL5BVCBH","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_8","alias_value":"2R45JODU","created_at":"2026-05-18T12:29:55Z"}],"graph_snapshots":[{"event_id":"sha256:155bb17a8ef9a07cd4dc2e43cc5af1a8fffb4d9826069430b22bffa3271a46b0","target":"graph","created_at":"2026-05-18T01:01:30Z","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":"Quantum digital signatures apply quantum mechanics to the problem of guaranteeing message integrity and non-repudiation with information-theoretical security, which are complementary to the confidentiality realized by quantum key distribution. Previous experimental demonstrations have been limited to transmission distances of less than 5-km of optical fiber in a laboratory setting. Here we report the first demonstration of quantum digital signatures over installed optical fiber as well as the longest transmission link reported to date. This demonstration used a 90-km long differential phase sh","authors_text":"Erika Andersson, Gerald S. Buller, Kaoru Shimizu, Kiyoshi Tamaki, Masahide Sasaki, Masahiro Takeoka, Mikio Fujiwara, Robert J. Collins, Ryan Amiri, Toshimori Honjo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-08-15T09:47:20Z","title":"Experimental transmission of quantum digital signatures over 90-km of installed optical fiber using a differential phase shift quantum key distribution system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.04220","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":"sha256:6927c9492647ec4a826bc0652c439acb93b077bf12b2012197404f5543833791","target":"record","created_at":"2026-05-18T01:01:30Z","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":"5bf9e72abad30b165a288af6b52e0f359795cd3617f4f107a5371ac1ba8122e9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-08-15T09:47:20Z","title_canon_sha256":"165c040bd8f4e33515b56ad4e1f8bd800c147dcef9295809a1cd635b223dcebc"},"schema_version":"1.0","source":{"id":"1608.04220","kind":"arxiv","version":1}},"canonical_sha256":"d479d4b87482fa1a88273a045086e3ee9ca4f37bb0f16fa86a1dd7ef89f44c4d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d479d4b87482fa1a88273a045086e3ee9ca4f37bb0f16fa86a1dd7ef89f44c4d","first_computed_at":"2026-05-18T01:01:30.906237Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:01:30.906237Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"A6KoqVDGb/53mGxk4MZuDgYBIOGQuH6yDRf2wHdmoV1+tKUwdh66iCqe0RGkaY0kf4K1zsJZlQT9na2fb/8uBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:01:30.906917Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.04220","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6927c9492647ec4a826bc0652c439acb93b077bf12b2012197404f5543833791","sha256:155bb17a8ef9a07cd4dc2e43cc5af1a8fffb4d9826069430b22bffa3271a46b0"],"state_sha256":"7ee666de730b2be678c492cc647cd331c685140412e07fa258e46d150906372e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jZg6xrdKVtlkQ77be4iu/4JuH0z9lYekqRwJT215NkOrZeSrhwGG9hl//9r2qfiB3pTEiTGU0O0v7YAX2bthBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T18:58:16.581339Z","bundle_sha256":"fe6223c3cd81bafe511342c5bd890aecdc9f462f1b88bc495e1985221c268687"}}