{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:OWCU7RHXB5XNKXHKA763BSI4SN","short_pith_number":"pith:OWCU7RHX","canonical_record":{"source":{"id":"1709.08718","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.CR","submitted_at":"2017-09-25T20:39:05Z","cross_cats_sorted":[],"title_canon_sha256":"88c4746e48a8fd820e4d04b22f20eb9c6f91efb006fb314036a0a1ff00e53816","abstract_canon_sha256":"d95fab20340ba53aeb29430ab8aca1b44e28c9cbcfdbe4414e39b4d4551bae0a"},"schema_version":"1.0"},"canonical_sha256":"75854fc4f70f6ed55cea07fdb0c91c9344bcc9fa6c0765fb5a9abfb3ddcb1de8","source":{"kind":"arxiv","id":"1709.08718","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.08718","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"arxiv_version","alias_value":"1709.08718v1","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.08718","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"pith_short_12","alias_value":"OWCU7RHXB5XN","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"OWCU7RHXB5XNKXHK","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"OWCU7RHX","created_at":"2026-05-18T12:31:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:OWCU7RHXB5XNKXHKA763BSI4SN","target":"record","payload":{"canonical_record":{"source":{"id":"1709.08718","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.CR","submitted_at":"2017-09-25T20:39:05Z","cross_cats_sorted":[],"title_canon_sha256":"88c4746e48a8fd820e4d04b22f20eb9c6f91efb006fb314036a0a1ff00e53816","abstract_canon_sha256":"d95fab20340ba53aeb29430ab8aca1b44e28c9cbcfdbe4414e39b4d4551bae0a"},"schema_version":"1.0"},"canonical_sha256":"75854fc4f70f6ed55cea07fdb0c91c9344bcc9fa6c0765fb5a9abfb3ddcb1de8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:34:22.033371Z","signature_b64":"FncU8SvJk/sWlsDjwzMQbxE7nwTCX8VfiXH/6MPj9UYrkADHX1RPHJ9AWLsBX9ClPZEAUrcpO63OsfXfolVJCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"75854fc4f70f6ed55cea07fdb0c91c9344bcc9fa6c0765fb5a9abfb3ddcb1de8","last_reissued_at":"2026-05-18T00:34:22.032986Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:34:22.032986Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1709.08718","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":"2026-05-18T00:34:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PIlTzeeDY95pHX/T/EHwFKfx562AmkCb6jMs3ewwYOBrkxDJGSME+QN1cmJzsAreo8s7PBBQDudRTp9E0mL3Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T15:45:22.527748Z"},"content_sha256":"3131bdd3cde6af9ea293c3000e48bcd33db9599de2f87116e4fb1a43989c21ef","schema_version":"1.0","event_id":"sha256:3131bdd3cde6af9ea293c3000e48bcd33db9599de2f87116e4fb1a43989c21ef"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:OWCU7RHXB5XNKXHKA763BSI4SN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Detecting Censor Detection","license":"http://creativecommons.org/publicdomain/zero/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CR","authors_text":"David Fifield, Lynn Tsai, Qi Zhong","submitted_at":"2017-09-25T20:39:05Z","abstract_excerpt":"Our goal is to empirically discover how censors react to the introduction of new proxy servers that can be used to circumvent their information controls. We examine a specific case, that of obfuscated Tor bridges, and conduct experiments designed to discover how long it takes censors to block them (if they do block at all). Through a year's worth of active measurements from China, Iran, Kazakhstan, and other countries, we learn when bridges become blocked. In China we found the most interesting behavior, including long and varying delays before blocking, frequent failures during which blocked "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.08718","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":"2026-05-18T00:34:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BAJPvIkpPYx+3brVkkc3LazozdO2Bik51nn3f8huPb5WYS4J2e5AQ8F8Xb+C8xBL7RQdNKNK7mp0ePI+oe3sDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T15:45:22.528102Z"},"content_sha256":"dbbb056cdec388d223c078adceef641bd1ccd93014c210ec9ef4183eaa8aff51","schema_version":"1.0","event_id":"sha256:dbbb056cdec388d223c078adceef641bd1ccd93014c210ec9ef4183eaa8aff51"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OWCU7RHXB5XNKXHKA763BSI4SN/bundle.json","state_url":"https://pith.science/pith/OWCU7RHXB5XNKXHKA763BSI4SN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OWCU7RHXB5XNKXHKA763BSI4SN/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":"2026-06-05T15:45:22Z","links":{"resolver":"https://pith.science/pith/OWCU7RHXB5XNKXHKA763BSI4SN","bundle":"https://pith.science/pith/OWCU7RHXB5XNKXHKA763BSI4SN/bundle.json","state":"https://pith.science/pith/OWCU7RHXB5XNKXHKA763BSI4SN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OWCU7RHXB5XNKXHKA763BSI4SN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:OWCU7RHXB5XNKXHKA763BSI4SN","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":"d95fab20340ba53aeb29430ab8aca1b44e28c9cbcfdbe4414e39b4d4551bae0a","cross_cats_sorted":[],"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.CR","submitted_at":"2017-09-25T20:39:05Z","title_canon_sha256":"88c4746e48a8fd820e4d04b22f20eb9c6f91efb006fb314036a0a1ff00e53816"},"schema_version":"1.0","source":{"id":"1709.08718","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.08718","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"arxiv_version","alias_value":"1709.08718v1","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.08718","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"pith_short_12","alias_value":"OWCU7RHXB5XN","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"OWCU7RHXB5XNKXHK","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"OWCU7RHX","created_at":"2026-05-18T12:31:34Z"}],"graph_snapshots":[{"event_id":"sha256:dbbb056cdec388d223c078adceef641bd1ccd93014c210ec9ef4183eaa8aff51","target":"graph","created_at":"2026-05-18T00:34:22Z","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":"Our goal is to empirically discover how censors react to the introduction of new proxy servers that can be used to circumvent their information controls. We examine a specific case, that of obfuscated Tor bridges, and conduct experiments designed to discover how long it takes censors to block them (if they do block at all). Through a year's worth of active measurements from China, Iran, Kazakhstan, and other countries, we learn when bridges become blocked. In China we found the most interesting behavior, including long and varying delays before blocking, frequent failures during which blocked ","authors_text":"David Fifield, Lynn Tsai, Qi Zhong","cross_cats":[],"headline":"","license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.CR","submitted_at":"2017-09-25T20:39:05Z","title":"Detecting Censor Detection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.08718","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":"sha256:3131bdd3cde6af9ea293c3000e48bcd33db9599de2f87116e4fb1a43989c21ef","target":"record","created_at":"2026-05-18T00:34:22Z","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":"d95fab20340ba53aeb29430ab8aca1b44e28c9cbcfdbe4414e39b4d4551bae0a","cross_cats_sorted":[],"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"cs.CR","submitted_at":"2017-09-25T20:39:05Z","title_canon_sha256":"88c4746e48a8fd820e4d04b22f20eb9c6f91efb006fb314036a0a1ff00e53816"},"schema_version":"1.0","source":{"id":"1709.08718","kind":"arxiv","version":1}},"canonical_sha256":"75854fc4f70f6ed55cea07fdb0c91c9344bcc9fa6c0765fb5a9abfb3ddcb1de8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"75854fc4f70f6ed55cea07fdb0c91c9344bcc9fa6c0765fb5a9abfb3ddcb1de8","first_computed_at":"2026-05-18T00:34:22.032986Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:34:22.032986Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FncU8SvJk/sWlsDjwzMQbxE7nwTCX8VfiXH/6MPj9UYrkADHX1RPHJ9AWLsBX9ClPZEAUrcpO63OsfXfolVJCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:34:22.033371Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.08718","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3131bdd3cde6af9ea293c3000e48bcd33db9599de2f87116e4fb1a43989c21ef","sha256:dbbb056cdec388d223c078adceef641bd1ccd93014c210ec9ef4183eaa8aff51"],"state_sha256":"d58c8e8f2f584bd691f615354b6e2785eb7fac43a889d95c1d63cda29c3a0aaf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tmxv0XLyR2RiqA06W1LdNbSikzWf71z99EmzskQIRYu3Nz2SclP5VioycX6carAjxiYPjZjNXAGZLTQLRECkCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T15:45:22.530100Z","bundle_sha256":"2403ef5e54491a8063781154418ea775e41e0dc79e1441665e92923bd91495df"}}