{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:V4WYSM7G3LBS7FW4LVDONO6Q5Q","short_pith_number":"pith:V4WYSM7G","canonical_record":{"source":{"id":"1610.09580","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2016-10-29T23:32:09Z","cross_cats_sorted":[],"title_canon_sha256":"49d921861faa83f6c50eee0351fe97d87b77e9d2d135a47198378a620404fdf6","abstract_canon_sha256":"c7f117e3757a548f08b892a082f5b8fbedd81573397b349d09177725490fc23d"},"schema_version":"1.0"},"canonical_sha256":"af2d8933e6dac32f96dc5d46e6bbd0ec141837fc06988f0eb1a1db2822ffd067","source":{"kind":"arxiv","id":"1610.09580","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.09580","created_at":"2026-05-18T01:00:51Z"},{"alias_kind":"arxiv_version","alias_value":"1610.09580v1","created_at":"2026-05-18T01:00:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.09580","created_at":"2026-05-18T01:00:51Z"},{"alias_kind":"pith_short_12","alias_value":"V4WYSM7G3LBS","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"V4WYSM7G3LBS7FW4","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"V4WYSM7G","created_at":"2026-05-18T12:30:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:V4WYSM7G3LBS7FW4LVDONO6Q5Q","target":"record","payload":{"canonical_record":{"source":{"id":"1610.09580","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2016-10-29T23:32:09Z","cross_cats_sorted":[],"title_canon_sha256":"49d921861faa83f6c50eee0351fe97d87b77e9d2d135a47198378a620404fdf6","abstract_canon_sha256":"c7f117e3757a548f08b892a082f5b8fbedd81573397b349d09177725490fc23d"},"schema_version":"1.0"},"canonical_sha256":"af2d8933e6dac32f96dc5d46e6bbd0ec141837fc06988f0eb1a1db2822ffd067","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:00:51.620394Z","signature_b64":"sCwyOFqN0KfsebGQND2Us99GqQDTEwJL4r05YiKbTmBl/T+uAqDTs6vWFwbNzIWFX7+Ra+VCCmE08VZyuLkwCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"af2d8933e6dac32f96dc5d46e6bbd0ec141837fc06988f0eb1a1db2822ffd067","last_reissued_at":"2026-05-18T01:00:51.619913Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:00:51.619913Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.09580","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":"2026-05-18T01:00:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NXDN0wL5DL4urMpWWsyMncGJICC/ojZqFT+tNp+4kgtcetHByaYl1P8YUpbFj7R6gsnJzN3ZqigGQwcIXRaVAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T07:11:03.006616Z"},"content_sha256":"16e08e06c7a9a21c8cc59888cc8bdd0eab54f69f3399e5dc10c82ffa794de0da","schema_version":"1.0","event_id":"sha256:16e08e06c7a9a21c8cc59888cc8bdd0eab54f69f3399e5dc10c82ffa794de0da"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:V4WYSM7G3LBS7FW4LVDONO6Q5Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Data-driven Estimation of Origin-Destination Demand and User Cost Functions for the Optimization of Transportation Networks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.SY","authors_text":"Christos G. Cassandras, Ioannis Ch. Paschalidis, Jing Zhang, Sepideh Pourazarm","submitted_at":"2016-10-29T23:32:09Z","abstract_excerpt":"In earlier work (Zhang et al., 2016) we used actual traffic data from the Eastern Massachusetts transportation network in the form of spatial average speeds and road segment flow capacities in order to estimate Origin-Destination (OD) flow demand matrices for the network. Based on a Traffic Assignment Problem (TAP) formulation (termed \"forward problem\"), in this paper we use a scheme similar to our earlier work to estimate initial OD demand matrices and then propose a new inverse problem formulation in order to estimate user cost functions. This new formulation allows us to efficiently overcom"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.09580","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":"2026-05-18T01:00:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EudtBDfum+fwdsicSKrqwnBxifAVRG8/3y1bLXeAit0YggOS0OJAbfI2Wa2h8mKuhYgY9aVRECcbTcCA4udBAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T07:11:03.006965Z"},"content_sha256":"91f75100f906f31cfbc51ab009d612e294f188f77475e354a5f09001b127e2cb","schema_version":"1.0","event_id":"sha256:91f75100f906f31cfbc51ab009d612e294f188f77475e354a5f09001b127e2cb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V4WYSM7G3LBS7FW4LVDONO6Q5Q/bundle.json","state_url":"https://pith.science/pith/V4WYSM7G3LBS7FW4LVDONO6Q5Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V4WYSM7G3LBS7FW4LVDONO6Q5Q/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":"2026-06-01T07:11:03Z","links":{"resolver":"https://pith.science/pith/V4WYSM7G3LBS7FW4LVDONO6Q5Q","bundle":"https://pith.science/pith/V4WYSM7G3LBS7FW4LVDONO6Q5Q/bundle.json","state":"https://pith.science/pith/V4WYSM7G3LBS7FW4LVDONO6Q5Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V4WYSM7G3LBS7FW4LVDONO6Q5Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:V4WYSM7G3LBS7FW4LVDONO6Q5Q","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":"c7f117e3757a548f08b892a082f5b8fbedd81573397b349d09177725490fc23d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2016-10-29T23:32:09Z","title_canon_sha256":"49d921861faa83f6c50eee0351fe97d87b77e9d2d135a47198378a620404fdf6"},"schema_version":"1.0","source":{"id":"1610.09580","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.09580","created_at":"2026-05-18T01:00:51Z"},{"alias_kind":"arxiv_version","alias_value":"1610.09580v1","created_at":"2026-05-18T01:00:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.09580","created_at":"2026-05-18T01:00:51Z"},{"alias_kind":"pith_short_12","alias_value":"V4WYSM7G3LBS","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"V4WYSM7G3LBS7FW4","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"V4WYSM7G","created_at":"2026-05-18T12:30:46Z"}],"graph_snapshots":[{"event_id":"sha256:91f75100f906f31cfbc51ab009d612e294f188f77475e354a5f09001b127e2cb","target":"graph","created_at":"2026-05-18T01:00:51Z","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":"In earlier work (Zhang et al., 2016) we used actual traffic data from the Eastern Massachusetts transportation network in the form of spatial average speeds and road segment flow capacities in order to estimate Origin-Destination (OD) flow demand matrices for the network. Based on a Traffic Assignment Problem (TAP) formulation (termed \"forward problem\"), in this paper we use a scheme similar to our earlier work to estimate initial OD demand matrices and then propose a new inverse problem formulation in order to estimate user cost functions. This new formulation allows us to efficiently overcom","authors_text":"Christos G. Cassandras, Ioannis Ch. Paschalidis, Jing Zhang, Sepideh Pourazarm","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2016-10-29T23:32:09Z","title":"Data-driven Estimation of Origin-Destination Demand and User Cost Functions for the Optimization of Transportation Networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.09580","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":"sha256:16e08e06c7a9a21c8cc59888cc8bdd0eab54f69f3399e5dc10c82ffa794de0da","target":"record","created_at":"2026-05-18T01:00:51Z","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":"c7f117e3757a548f08b892a082f5b8fbedd81573397b349d09177725490fc23d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2016-10-29T23:32:09Z","title_canon_sha256":"49d921861faa83f6c50eee0351fe97d87b77e9d2d135a47198378a620404fdf6"},"schema_version":"1.0","source":{"id":"1610.09580","kind":"arxiv","version":1}},"canonical_sha256":"af2d8933e6dac32f96dc5d46e6bbd0ec141837fc06988f0eb1a1db2822ffd067","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"af2d8933e6dac32f96dc5d46e6bbd0ec141837fc06988f0eb1a1db2822ffd067","first_computed_at":"2026-05-18T01:00:51.619913Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:00:51.619913Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sCwyOFqN0KfsebGQND2Us99GqQDTEwJL4r05YiKbTmBl/T+uAqDTs6vWFwbNzIWFX7+Ra+VCCmE08VZyuLkwCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:00:51.620394Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.09580","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:16e08e06c7a9a21c8cc59888cc8bdd0eab54f69f3399e5dc10c82ffa794de0da","sha256:91f75100f906f31cfbc51ab009d612e294f188f77475e354a5f09001b127e2cb"],"state_sha256":"5a420de73681b68ed6f5e9095cca3d86d1fb835e2eff88dfc431c6545431f350"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hd8hVE7J6GyHXJK13EZfVuvLM8J4xAR3qGGCafg3Ou40nrobUpUhZUVNmkNjNHAazYvRxKxwIfAuKAwWSmBqAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T07:11:03.008922Z","bundle_sha256":"d1e3a59e548b57bb40b168cefba9ed2b67bc90d4ad6e0c30176c591073753e66"}}