{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:ETSGK2DKJOB7J64KKBVTTHB4CI","short_pith_number":"pith:ETSGK2DK","canonical_record":{"source":{"id":"1402.4033","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SI","submitted_at":"2014-02-17T15:36:38Z","cross_cats_sorted":["physics.soc-ph"],"title_canon_sha256":"505f3a490b5f704f3597474056b093a346fe3d1cd1cc80089910526707bfd1dd","abstract_canon_sha256":"5428dff676da1b4cd9e97f886b126af5e0d377b96180c6567d283373c7de94b5"},"schema_version":"1.0"},"canonical_sha256":"24e465686a4b83f4fb8a506b399c3c121b3cbe97fe2db74479eae546cb0c690a","source":{"kind":"arxiv","id":"1402.4033","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.4033","created_at":"2026-05-18T02:58:47Z"},{"alias_kind":"arxiv_version","alias_value":"1402.4033v1","created_at":"2026-05-18T02:58:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.4033","created_at":"2026-05-18T02:58:47Z"},{"alias_kind":"pith_short_12","alias_value":"ETSGK2DKJOB7","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_16","alias_value":"ETSGK2DKJOB7J64K","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_8","alias_value":"ETSGK2DK","created_at":"2026-05-18T12:28:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:ETSGK2DKJOB7J64KKBVTTHB4CI","target":"record","payload":{"canonical_record":{"source":{"id":"1402.4033","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SI","submitted_at":"2014-02-17T15:36:38Z","cross_cats_sorted":["physics.soc-ph"],"title_canon_sha256":"505f3a490b5f704f3597474056b093a346fe3d1cd1cc80089910526707bfd1dd","abstract_canon_sha256":"5428dff676da1b4cd9e97f886b126af5e0d377b96180c6567d283373c7de94b5"},"schema_version":"1.0"},"canonical_sha256":"24e465686a4b83f4fb8a506b399c3c121b3cbe97fe2db74479eae546cb0c690a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:58:47.494635Z","signature_b64":"IAU+OczoHqgKiDIUOueb2QSCWK5d79ch/q/54Ozinyn59h3cDI0r4ZNnmhKS7sq6hrWjjJYUX9cebTSO5xDCDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"24e465686a4b83f4fb8a506b399c3c121b3cbe97fe2db74479eae546cb0c690a","last_reissued_at":"2026-05-18T02:58:47.493892Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:58:47.493892Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1402.4033","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":"2026-05-18T02:58:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W4jbsyqcNAO3Cp0XoGeOk1d7fRLsWtDn2QeURJCIRa7LyO5rxbRv2NbfVIJYbQFG34o/66Jy3CAfhHD1lfAoBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:30:19.749213Z"},"content_sha256":"c3b02592a41d4f34cfef6942a7e9dfe4324070130cc7d94f43a4cd6842abdad1","schema_version":"1.0","event_id":"sha256:c3b02592a41d4f34cfef6942a7e9dfe4324070130cc7d94f43a4cd6842abdad1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:ETSGK2DKJOB7J64KKBVTTHB4CI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Friendship Prediction in Composite Social Networks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.soc-ph"],"primary_cat":"cs.SI","authors_text":"Erheng Zhong, Evan Wei Xiang, Nathan Nan Liu, Qiang Yang, Wei Fan","submitted_at":"2014-02-17T15:36:38Z","abstract_excerpt":"Friendship prediction is an important task in social network analysis (SNA). It can help users identify friends and improve their level of activity. Most previous approaches predict users' friendship based on their historical records, such as their existing friendship, social interactions, etc. However, in reality, most users have limited friends in a single network, and the data can be very sparse. The sparsity problem causes existing methods to overfit the rare observations and suffer from serious performance degradation. This is particularly true when a new social network just starts to for"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.4033","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":"2026-05-18T02:58:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"twkd4YlmlGS2dFSa+ui5jwkamGgz5ulSYEnmCZC6nht9P9vZqqcV6TyGJROofG1JCzeF29zfmO3qcgzLTb1RDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:30:19.749595Z"},"content_sha256":"0b489450c30bb918c5c48b12e38adbbd1cdc2dc275cd4528309d76d20e8772d3","schema_version":"1.0","event_id":"sha256:0b489450c30bb918c5c48b12e38adbbd1cdc2dc275cd4528309d76d20e8772d3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ETSGK2DKJOB7J64KKBVTTHB4CI/bundle.json","state_url":"https://pith.science/pith/ETSGK2DKJOB7J64KKBVTTHB4CI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ETSGK2DKJOB7J64KKBVTTHB4CI/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":"2026-06-03T17:30:19Z","links":{"resolver":"https://pith.science/pith/ETSGK2DKJOB7J64KKBVTTHB4CI","bundle":"https://pith.science/pith/ETSGK2DKJOB7J64KKBVTTHB4CI/bundle.json","state":"https://pith.science/pith/ETSGK2DKJOB7J64KKBVTTHB4CI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ETSGK2DKJOB7J64KKBVTTHB4CI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:ETSGK2DKJOB7J64KKBVTTHB4CI","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":"5428dff676da1b4cd9e97f886b126af5e0d377b96180c6567d283373c7de94b5","cross_cats_sorted":["physics.soc-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SI","submitted_at":"2014-02-17T15:36:38Z","title_canon_sha256":"505f3a490b5f704f3597474056b093a346fe3d1cd1cc80089910526707bfd1dd"},"schema_version":"1.0","source":{"id":"1402.4033","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.4033","created_at":"2026-05-18T02:58:47Z"},{"alias_kind":"arxiv_version","alias_value":"1402.4033v1","created_at":"2026-05-18T02:58:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.4033","created_at":"2026-05-18T02:58:47Z"},{"alias_kind":"pith_short_12","alias_value":"ETSGK2DKJOB7","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_16","alias_value":"ETSGK2DKJOB7J64K","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_8","alias_value":"ETSGK2DK","created_at":"2026-05-18T12:28:28Z"}],"graph_snapshots":[{"event_id":"sha256:0b489450c30bb918c5c48b12e38adbbd1cdc2dc275cd4528309d76d20e8772d3","target":"graph","created_at":"2026-05-18T02:58:47Z","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":"Friendship prediction is an important task in social network analysis (SNA). It can help users identify friends and improve their level of activity. Most previous approaches predict users' friendship based on their historical records, such as their existing friendship, social interactions, etc. However, in reality, most users have limited friends in a single network, and the data can be very sparse. The sparsity problem causes existing methods to overfit the rare observations and suffer from serious performance degradation. This is particularly true when a new social network just starts to for","authors_text":"Erheng Zhong, Evan Wei Xiang, Nathan Nan Liu, Qiang Yang, Wei Fan","cross_cats":["physics.soc-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SI","submitted_at":"2014-02-17T15:36:38Z","title":"Friendship Prediction in Composite Social Networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.4033","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:c3b02592a41d4f34cfef6942a7e9dfe4324070130cc7d94f43a4cd6842abdad1","target":"record","created_at":"2026-05-18T02:58:47Z","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":"5428dff676da1b4cd9e97f886b126af5e0d377b96180c6567d283373c7de94b5","cross_cats_sorted":["physics.soc-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SI","submitted_at":"2014-02-17T15:36:38Z","title_canon_sha256":"505f3a490b5f704f3597474056b093a346fe3d1cd1cc80089910526707bfd1dd"},"schema_version":"1.0","source":{"id":"1402.4033","kind":"arxiv","version":1}},"canonical_sha256":"24e465686a4b83f4fb8a506b399c3c121b3cbe97fe2db74479eae546cb0c690a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"24e465686a4b83f4fb8a506b399c3c121b3cbe97fe2db74479eae546cb0c690a","first_computed_at":"2026-05-18T02:58:47.493892Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:58:47.493892Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IAU+OczoHqgKiDIUOueb2QSCWK5d79ch/q/54Ozinyn59h3cDI0r4ZNnmhKS7sq6hrWjjJYUX9cebTSO5xDCDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:58:47.494635Z","signed_message":"canonical_sha256_bytes"},"source_id":"1402.4033","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c3b02592a41d4f34cfef6942a7e9dfe4324070130cc7d94f43a4cd6842abdad1","sha256:0b489450c30bb918c5c48b12e38adbbd1cdc2dc275cd4528309d76d20e8772d3"],"state_sha256":"443df0f9dae47bb42e6ab4ec1ea6dc9226e9f53726dacb1b573800e69b73f723"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lKrAx8Xl+2hx7d+urA6pxpUF3D4F2Zp90CgIy71OFiOmTtr3oD+JaTczLepWRILcGsVhRRwFaC2pgFiKtJC0Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T17:30:19.751585Z","bundle_sha256":"cbdb97c2d1b4beffe1ec784c77250074e1a099c10c90fef2aaa9b532a69231e2"}}