{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:SPNIKR2JVV7FIXSAIP6D5JERZF","short_pith_number":"pith:SPNIKR2J","canonical_record":{"source":{"id":"1502.06659","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2015-02-24T00:20:14Z","cross_cats_sorted":[],"title_canon_sha256":"9a838b2b19078a990b8a3a8146986543e409f3f4dc07c7049e433c434b3d0c57","abstract_canon_sha256":"a700281b704266016c852b5d7a7f67e2c18432166851c59a254517279392c962"},"schema_version":"1.0"},"canonical_sha256":"93da854749ad7e545e4043fc3ea491c95caadd766d0b5ecd2f9101ea51f7cf79","source":{"kind":"arxiv","id":"1502.06659","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.06659","created_at":"2026-05-18T02:26:29Z"},{"alias_kind":"arxiv_version","alias_value":"1502.06659v1","created_at":"2026-05-18T02:26:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.06659","created_at":"2026-05-18T02:26:29Z"},{"alias_kind":"pith_short_12","alias_value":"SPNIKR2JVV7F","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_16","alias_value":"SPNIKR2JVV7FIXSA","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_8","alias_value":"SPNIKR2J","created_at":"2026-05-18T12:29:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:SPNIKR2JVV7FIXSAIP6D5JERZF","target":"record","payload":{"canonical_record":{"source":{"id":"1502.06659","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2015-02-24T00:20:14Z","cross_cats_sorted":[],"title_canon_sha256":"9a838b2b19078a990b8a3a8146986543e409f3f4dc07c7049e433c434b3d0c57","abstract_canon_sha256":"a700281b704266016c852b5d7a7f67e2c18432166851c59a254517279392c962"},"schema_version":"1.0"},"canonical_sha256":"93da854749ad7e545e4043fc3ea491c95caadd766d0b5ecd2f9101ea51f7cf79","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:26:29.503710Z","signature_b64":"coi7LOd2lTBMIZBNV11RgzU9NAeENSLDNqVcgs212MMMOzwRN10TIdEKUPjOt00O7gLmfjPxY1sk7ixv+HDjAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"93da854749ad7e545e4043fc3ea491c95caadd766d0b5ecd2f9101ea51f7cf79","last_reissued_at":"2026-05-18T02:26:29.503226Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:26:29.503226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.06659","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":"2026-05-18T02:26:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7q9LgR+VruFpmmyd355kGjEvr5dW2SVc2pWa2OTTpXPvzpy6FiOx3iU468BDeu1njYNUfIwPUMBlEhP5zytuCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T05:37:08.581604Z"},"content_sha256":"c3cf0497a14728fb6d10024829dc129f2aa68889632f70bda375a002b013fc4c","schema_version":"1.0","event_id":"sha256:c3cf0497a14728fb6d10024829dc129f2aa68889632f70bda375a002b013fc4c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:SPNIKR2JVV7FIXSAIP6D5JERZF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On inferring structural connectivity from brain functional-MRI data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"q-bio.NC","authors_text":"Donna Xu, Sanjay Chawla, Somwrita Sarkar","submitted_at":"2015-02-24T00:20:14Z","abstract_excerpt":"The anatomical structure of the brain can be observed via non-invasive techniques such as diffusion imaging. However, these are imperfect because they miss connections that are actually known to exist, especially long range inter-hemispheric ones. In this paper we formulate the inverse problem of inferring the structural connectivity of brain networks from experimentally observed functional connectivity via functional Magnetic Resonance Imaging (fMRI), by formulating it as a convex optimization problem. We show that structural connectivity can be modeled as an optimal sparse representation der"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.06659","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":"2026-05-18T02:26:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bDmlS9Y0f8/xyXaA9cYLWe8+IIn/+j0+wYG0FFclskVmKyKsC/NylPgAM72ufbaMxcBg68PZnBIx3vrqubI5Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T05:37:08.582182Z"},"content_sha256":"da5a9dd0eb6746c4af0d6aa1c67c15e37eb8867c05483f64b50345bc69a9e67e","schema_version":"1.0","event_id":"sha256:da5a9dd0eb6746c4af0d6aa1c67c15e37eb8867c05483f64b50345bc69a9e67e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SPNIKR2JVV7FIXSAIP6D5JERZF/bundle.json","state_url":"https://pith.science/pith/SPNIKR2JVV7FIXSAIP6D5JERZF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SPNIKR2JVV7FIXSAIP6D5JERZF/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":"2026-06-07T05:37:08Z","links":{"resolver":"https://pith.science/pith/SPNIKR2JVV7FIXSAIP6D5JERZF","bundle":"https://pith.science/pith/SPNIKR2JVV7FIXSAIP6D5JERZF/bundle.json","state":"https://pith.science/pith/SPNIKR2JVV7FIXSAIP6D5JERZF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SPNIKR2JVV7FIXSAIP6D5JERZF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:SPNIKR2JVV7FIXSAIP6D5JERZF","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":"a700281b704266016c852b5d7a7f67e2c18432166851c59a254517279392c962","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2015-02-24T00:20:14Z","title_canon_sha256":"9a838b2b19078a990b8a3a8146986543e409f3f4dc07c7049e433c434b3d0c57"},"schema_version":"1.0","source":{"id":"1502.06659","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.06659","created_at":"2026-05-18T02:26:29Z"},{"alias_kind":"arxiv_version","alias_value":"1502.06659v1","created_at":"2026-05-18T02:26:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.06659","created_at":"2026-05-18T02:26:29Z"},{"alias_kind":"pith_short_12","alias_value":"SPNIKR2JVV7F","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_16","alias_value":"SPNIKR2JVV7FIXSA","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_8","alias_value":"SPNIKR2J","created_at":"2026-05-18T12:29:42Z"}],"graph_snapshots":[{"event_id":"sha256:da5a9dd0eb6746c4af0d6aa1c67c15e37eb8867c05483f64b50345bc69a9e67e","target":"graph","created_at":"2026-05-18T02:26:29Z","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":"The anatomical structure of the brain can be observed via non-invasive techniques such as diffusion imaging. However, these are imperfect because they miss connections that are actually known to exist, especially long range inter-hemispheric ones. In this paper we formulate the inverse problem of inferring the structural connectivity of brain networks from experimentally observed functional connectivity via functional Magnetic Resonance Imaging (fMRI), by formulating it as a convex optimization problem. We show that structural connectivity can be modeled as an optimal sparse representation der","authors_text":"Donna Xu, Sanjay Chawla, Somwrita Sarkar","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2015-02-24T00:20:14Z","title":"On inferring structural connectivity from brain functional-MRI data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.06659","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:c3cf0497a14728fb6d10024829dc129f2aa68889632f70bda375a002b013fc4c","target":"record","created_at":"2026-05-18T02:26:29Z","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":"a700281b704266016c852b5d7a7f67e2c18432166851c59a254517279392c962","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2015-02-24T00:20:14Z","title_canon_sha256":"9a838b2b19078a990b8a3a8146986543e409f3f4dc07c7049e433c434b3d0c57"},"schema_version":"1.0","source":{"id":"1502.06659","kind":"arxiv","version":1}},"canonical_sha256":"93da854749ad7e545e4043fc3ea491c95caadd766d0b5ecd2f9101ea51f7cf79","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"93da854749ad7e545e4043fc3ea491c95caadd766d0b5ecd2f9101ea51f7cf79","first_computed_at":"2026-05-18T02:26:29.503226Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:26:29.503226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"coi7LOd2lTBMIZBNV11RgzU9NAeENSLDNqVcgs212MMMOzwRN10TIdEKUPjOt00O7gLmfjPxY1sk7ixv+HDjAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:26:29.503710Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.06659","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c3cf0497a14728fb6d10024829dc129f2aa68889632f70bda375a002b013fc4c","sha256:da5a9dd0eb6746c4af0d6aa1c67c15e37eb8867c05483f64b50345bc69a9e67e"],"state_sha256":"61d506a05fcb4278521573904eb5714e022a9cd7b5e1309eec744c23faeee8b9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FGxZsDyn/F6ysFEOpc1fEnLHTXVsaM/AqdR/Zufmiitau2hfTHREd2pzTFVAw5qqhosjgvryGMMysh1tO25aCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T05:37:08.585887Z","bundle_sha256":"ff122d70ab352e40f82aba7f38fa786ab42ccb39612b12520b2f5c99eeca9c93"}}