{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:IR62ZJXDRLN6S4Z6EDYGDWG6EJ","short_pith_number":"pith:IR62ZJXD","canonical_record":{"source":{"id":"2104.09656","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2021-04-19T21:57:11Z","cross_cats_sorted":[],"title_canon_sha256":"bfe989e3581b7f35da0923bf51fbad9cedcb85d104febc684a9c6ca5993d2bdb","abstract_canon_sha256":"a26711432300dec97c2c9cc877501f824dd44189c1dbb3654695322b7793ac44"},"schema_version":"1.0"},"canonical_sha256":"447daca6e38adbe9733e20f061d8de225c48f58822c8c165e728be36ee94f8fc","source":{"kind":"arxiv","id":"2104.09656","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.09656","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"arxiv_version","alias_value":"2104.09656v1","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.09656","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_12","alias_value":"IR62ZJXDRLN6","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_16","alias_value":"IR62ZJXDRLN6S4Z6","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_8","alias_value":"IR62ZJXD","created_at":"2026-07-05T02:33:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:IR62ZJXDRLN6S4Z6EDYGDWG6EJ","target":"record","payload":{"canonical_record":{"source":{"id":"2104.09656","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2021-04-19T21:57:11Z","cross_cats_sorted":[],"title_canon_sha256":"bfe989e3581b7f35da0923bf51fbad9cedcb85d104febc684a9c6ca5993d2bdb","abstract_canon_sha256":"a26711432300dec97c2c9cc877501f824dd44189c1dbb3654695322b7793ac44"},"schema_version":"1.0"},"canonical_sha256":"447daca6e38adbe9733e20f061d8de225c48f58822c8c165e728be36ee94f8fc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:33:35.715028Z","signature_b64":"498md2tkx+tB7SfCt7Y1puXyNsCkOebEwDEcZOTj80ZL3RWAiqnkXJULyI4wHsC0ioM9cOWc4kI9AotHsLK2Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"447daca6e38adbe9733e20f061d8de225c48f58822c8c165e728be36ee94f8fc","last_reissued_at":"2026-07-05T02:33:35.714556Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:33:35.714556Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.09656","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":"2026-07-05T02:33:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cJiUNnPXBbcFy0eW6jMdGGyvNpFzigrPJvaXilCsv5QcwO02uMVhVAGjwvvrHRWtpN+QfK1RKZVkrhJqX1UUCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T07:40:12.285644Z"},"content_sha256":"aff09d68a1a53d9a375ce5ffd1fd7b89af892eaac1995f93db17794a475b5198","schema_version":"1.0","event_id":"sha256:aff09d68a1a53d9a375ce5ffd1fd7b89af892eaac1995f93db17794a475b5198"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:IR62ZJXDRLN6S4Z6EDYGDWG6EJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"\"Don't quote me on that\": Finding Mixtures of Sources in News Articles","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.CL","authors_text":"Alexander Spangher, Emilio Ferrara, Jonathan May, Nanyun Peng","submitted_at":"2021-04-19T21:57:11Z","abstract_excerpt":"Journalists publish statements provided by people, or \\textit{sources} to contextualize current events, help voters make informed decisions, and hold powerful individuals accountable. In this work, we construct an ontological labeling system for sources based on each source's \\textit{affiliation} and \\textit{role}. We build a probabilistic model to infer these attributes for named sources and to describe news articles as mixtures of these sources. Our model outperforms existing mixture modeling and co-clustering approaches and correctly infers source-type in 80\\% of expert-evaluated trials. Su"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.09656","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/2104.09656/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":"2026-07-05T02:33:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UJUtz5VM1HUU//FkjOf+JyUS/TBq46zDjX07iVfWp3UVkf1eI0xOWFybCO6in6gHrmxgZURb9lwJwrn6tca3Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T07:40:12.286202Z"},"content_sha256":"00c5eb06ac3906c07eece105efff519a42b24fa3f50b783a0c084f5676ab98c0","schema_version":"1.0","event_id":"sha256:00c5eb06ac3906c07eece105efff519a42b24fa3f50b783a0c084f5676ab98c0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IR62ZJXDRLN6S4Z6EDYGDWG6EJ/bundle.json","state_url":"https://pith.science/pith/IR62ZJXDRLN6S4Z6EDYGDWG6EJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IR62ZJXDRLN6S4Z6EDYGDWG6EJ/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":"2026-08-17T07:40:12Z","links":{"resolver":"https://pith.science/pith/IR62ZJXDRLN6S4Z6EDYGDWG6EJ","bundle":"https://pith.science/pith/IR62ZJXDRLN6S4Z6EDYGDWG6EJ/bundle.json","state":"https://pith.science/pith/IR62ZJXDRLN6S4Z6EDYGDWG6EJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IR62ZJXDRLN6S4Z6EDYGDWG6EJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:IR62ZJXDRLN6S4Z6EDYGDWG6EJ","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":"a26711432300dec97c2c9cc877501f824dd44189c1dbb3654695322b7793ac44","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2021-04-19T21:57:11Z","title_canon_sha256":"bfe989e3581b7f35da0923bf51fbad9cedcb85d104febc684a9c6ca5993d2bdb"},"schema_version":"1.0","source":{"id":"2104.09656","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.09656","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"arxiv_version","alias_value":"2104.09656v1","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.09656","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_12","alias_value":"IR62ZJXDRLN6","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_16","alias_value":"IR62ZJXDRLN6S4Z6","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_8","alias_value":"IR62ZJXD","created_at":"2026-07-05T02:33:35Z"}],"graph_snapshots":[{"event_id":"sha256:00c5eb06ac3906c07eece105efff519a42b24fa3f50b783a0c084f5676ab98c0","target":"graph","created_at":"2026-07-05T02:33:35Z","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/2104.09656/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Journalists publish statements provided by people, or \\textit{sources} to contextualize current events, help voters make informed decisions, and hold powerful individuals accountable. In this work, we construct an ontological labeling system for sources based on each source's \\textit{affiliation} and \\textit{role}. We build a probabilistic model to infer these attributes for named sources and to describe news articles as mixtures of these sources. Our model outperforms existing mixture modeling and co-clustering approaches and correctly infers source-type in 80\\% of expert-evaluated trials. Su","authors_text":"Alexander Spangher, Emilio Ferrara, Jonathan May, Nanyun Peng","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2021-04-19T21:57:11Z","title":"\"Don't quote me on that\": Finding Mixtures of Sources in News Articles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.09656","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:aff09d68a1a53d9a375ce5ffd1fd7b89af892eaac1995f93db17794a475b5198","target":"record","created_at":"2026-07-05T02:33:35Z","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":"a26711432300dec97c2c9cc877501f824dd44189c1dbb3654695322b7793ac44","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2021-04-19T21:57:11Z","title_canon_sha256":"bfe989e3581b7f35da0923bf51fbad9cedcb85d104febc684a9c6ca5993d2bdb"},"schema_version":"1.0","source":{"id":"2104.09656","kind":"arxiv","version":1}},"canonical_sha256":"447daca6e38adbe9733e20f061d8de225c48f58822c8c165e728be36ee94f8fc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"447daca6e38adbe9733e20f061d8de225c48f58822c8c165e728be36ee94f8fc","first_computed_at":"2026-07-05T02:33:35.714556Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:33:35.714556Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"498md2tkx+tB7SfCt7Y1puXyNsCkOebEwDEcZOTj80ZL3RWAiqnkXJULyI4wHsC0ioM9cOWc4kI9AotHsLK2Cg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:33:35.715028Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.09656","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aff09d68a1a53d9a375ce5ffd1fd7b89af892eaac1995f93db17794a475b5198","sha256:00c5eb06ac3906c07eece105efff519a42b24fa3f50b783a0c084f5676ab98c0"],"state_sha256":"ed5270195102ef906e3df4ab7040e19b04b8bcbc6c126c102686949e2135ef5e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T82L6eaKB186QeqgzPV4sgULH/54uMt/3IshftozfSW0Kac5GP/Jdwa/s+1RSBtkpMqkA+XN4p9JTmfzeqR8AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T07:40:12.308252Z","bundle_sha256":"aa04a6848706b622862bf9d82edba12ef11e84e4d54f5ea95666c3b8b872fb75"}}