{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:5FTEBG3O7HGLLNLPLGTO5BCLNE","short_pith_number":"pith:5FTEBG3O","canonical_record":{"source":{"id":"1802.04122","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2018-02-12T15:35:48Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"4b92a8ba24f72eed6468f3bec8b5fef9729c087971a38d9829c5d357815ed432","abstract_canon_sha256":"719c81a734f2ceac9a856c82de4a8b80f906c4ca0e9582af3c2a2d95dd0f9fab"},"schema_version":"1.0"},"canonical_sha256":"e966409b6ef9ccb5b56f59a6ee844b693275669330cef4b364018b9135dbd047","source":{"kind":"arxiv","id":"1802.04122","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.04122","created_at":"2026-05-18T00:23:46Z"},{"alias_kind":"arxiv_version","alias_value":"1802.04122v1","created_at":"2026-05-18T00:23:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.04122","created_at":"2026-05-18T00:23:46Z"},{"alias_kind":"pith_short_12","alias_value":"5FTEBG3O7HGL","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5FTEBG3O7HGLLNLP","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5FTEBG3O","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:5FTEBG3O7HGLLNLPLGTO5BCLNE","target":"record","payload":{"canonical_record":{"source":{"id":"1802.04122","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2018-02-12T15:35:48Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"4b92a8ba24f72eed6468f3bec8b5fef9729c087971a38d9829c5d357815ed432","abstract_canon_sha256":"719c81a734f2ceac9a856c82de4a8b80f906c4ca0e9582af3c2a2d95dd0f9fab"},"schema_version":"1.0"},"canonical_sha256":"e966409b6ef9ccb5b56f59a6ee844b693275669330cef4b364018b9135dbd047","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:23:46.758598Z","signature_b64":"/3qUiVbv1tx4YLjrp91vI1WTpkBsBJwNaJfPkdkGyaolN1w1F+D/Hp2Kr8RyQsLfixYxVwVAmkV57ppAzgvZCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e966409b6ef9ccb5b56f59a6ee844b693275669330cef4b364018b9135dbd047","last_reissued_at":"2026-05-18T00:23:46.758142Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:23:46.758142Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.04122","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":"2026-05-18T00:23:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jNHt9kwd4uCZU0SWONAASVIXD1j//lQD35ZdfIFHYCtZrcXe7h34h1B8DN76ZZfOStdAhtQV7Bjxi+fWDEk4Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:10:15.281445Z"},"content_sha256":"7d8a73193c3ca2cf840a51058c1ca3b3f0bb896dbd0d09131f2d641f6dae85d6","schema_version":"1.0","event_id":"sha256:7d8a73193c3ca2cf840a51058c1ca3b3f0bb896dbd0d09131f2d641f6dae85d6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:5FTEBG3O7HGLLNLPLGTO5BCLNE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tagvisor: A Privacy Advisor for Sharing Hashtags","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SI"],"primary_cat":"cs.CR","authors_text":"Cheng-Te Li, Jun Pang, Mathias Humbert, Michael Backes, Tahleen Rahman, Yang Zhang","submitted_at":"2018-02-12T15:35:48Z","abstract_excerpt":"Hashtag has emerged as a widely used concept of popular culture and campaigns, but its implications on people's privacy have not been investigated so far. In this paper, we present the first systematic analysis of privacy issues induced by hashtags. We concentrate in particular on location, which is recognized as one of the key privacy concerns in the Internet era. By relying on a random forest model, we show that we can infer a user's precise location from hashtags with accuracy of 70\\% to 76\\%, depending on the city. To remedy this situation, we introduce a system called Tagvisor that system"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.04122","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":"2026-05-18T00:23:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HfqlEYaFUjP+7Hov5kFCKFiU6mbGLEl+iI1GnyqVy9WXLABD3cCv4xF6+vRIWn671MS0pPWVQo/w4jSJwUTbCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:10:15.282115Z"},"content_sha256":"cc4374f50459cdf4db9e340ac9eaf0d873687e06581694ab4fef44c7a39f92c6","schema_version":"1.0","event_id":"sha256:cc4374f50459cdf4db9e340ac9eaf0d873687e06581694ab4fef44c7a39f92c6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5FTEBG3O7HGLLNLPLGTO5BCLNE/bundle.json","state_url":"https://pith.science/pith/5FTEBG3O7HGLLNLPLGTO5BCLNE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5FTEBG3O7HGLLNLPLGTO5BCLNE/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":"2026-05-29T15:10:15Z","links":{"resolver":"https://pith.science/pith/5FTEBG3O7HGLLNLPLGTO5BCLNE","bundle":"https://pith.science/pith/5FTEBG3O7HGLLNLPLGTO5BCLNE/bundle.json","state":"https://pith.science/pith/5FTEBG3O7HGLLNLPLGTO5BCLNE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5FTEBG3O7HGLLNLPLGTO5BCLNE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:5FTEBG3O7HGLLNLPLGTO5BCLNE","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":"719c81a734f2ceac9a856c82de4a8b80f906c4ca0e9582af3c2a2d95dd0f9fab","cross_cats_sorted":["cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2018-02-12T15:35:48Z","title_canon_sha256":"4b92a8ba24f72eed6468f3bec8b5fef9729c087971a38d9829c5d357815ed432"},"schema_version":"1.0","source":{"id":"1802.04122","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.04122","created_at":"2026-05-18T00:23:46Z"},{"alias_kind":"arxiv_version","alias_value":"1802.04122v1","created_at":"2026-05-18T00:23:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.04122","created_at":"2026-05-18T00:23:46Z"},{"alias_kind":"pith_short_12","alias_value":"5FTEBG3O7HGL","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5FTEBG3O7HGLLNLP","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5FTEBG3O","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:cc4374f50459cdf4db9e340ac9eaf0d873687e06581694ab4fef44c7a39f92c6","target":"graph","created_at":"2026-05-18T00:23:46Z","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":"Hashtag has emerged as a widely used concept of popular culture and campaigns, but its implications on people's privacy have not been investigated so far. In this paper, we present the first systematic analysis of privacy issues induced by hashtags. We concentrate in particular on location, which is recognized as one of the key privacy concerns in the Internet era. By relying on a random forest model, we show that we can infer a user's precise location from hashtags with accuracy of 70\\% to 76\\%, depending on the city. To remedy this situation, we introduce a system called Tagvisor that system","authors_text":"Cheng-Te Li, Jun Pang, Mathias Humbert, Michael Backes, Tahleen Rahman, Yang Zhang","cross_cats":["cs.SI"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2018-02-12T15:35:48Z","title":"Tagvisor: A Privacy Advisor for Sharing Hashtags"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.04122","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":"sha256:7d8a73193c3ca2cf840a51058c1ca3b3f0bb896dbd0d09131f2d641f6dae85d6","target":"record","created_at":"2026-05-18T00:23:46Z","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":"719c81a734f2ceac9a856c82de4a8b80f906c4ca0e9582af3c2a2d95dd0f9fab","cross_cats_sorted":["cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2018-02-12T15:35:48Z","title_canon_sha256":"4b92a8ba24f72eed6468f3bec8b5fef9729c087971a38d9829c5d357815ed432"},"schema_version":"1.0","source":{"id":"1802.04122","kind":"arxiv","version":1}},"canonical_sha256":"e966409b6ef9ccb5b56f59a6ee844b693275669330cef4b364018b9135dbd047","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e966409b6ef9ccb5b56f59a6ee844b693275669330cef4b364018b9135dbd047","first_computed_at":"2026-05-18T00:23:46.758142Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:23:46.758142Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/3qUiVbv1tx4YLjrp91vI1WTpkBsBJwNaJfPkdkGyaolN1w1F+D/Hp2Kr8RyQsLfixYxVwVAmkV57ppAzgvZCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:23:46.758598Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.04122","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7d8a73193c3ca2cf840a51058c1ca3b3f0bb896dbd0d09131f2d641f6dae85d6","sha256:cc4374f50459cdf4db9e340ac9eaf0d873687e06581694ab4fef44c7a39f92c6"],"state_sha256":"0daf35a614328670e1a7ad972b2f307e6bed21f9b78c5905a4619037cb4ef880"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bFiSK2qr00lrsqHW9qWuZ321ATPYpNnZtt/StYvqmRjtOc39jitHanxlBYH+fmLN8eK9l+9B0HxkqnFdd/xPDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T15:10:15.286052Z","bundle_sha256":"9d5290b17d8651de9cb07b63073ae12c8a4730c0667008c6826891b730e5e568"}}