{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:O5J3THKFF7XTIQU4ZXUCCAUXLT","short_pith_number":"pith:O5J3THKF","canonical_record":{"source":{"id":"1602.02027","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-02-05T14:14:23Z","cross_cats_sorted":[],"title_canon_sha256":"ffe1fe4a45d64853c83371d5b0b501f434ba6b726bad2e8c167d8181303d9864","abstract_canon_sha256":"2f5a1937dfe69cf149533d03b15c152de342b767d88959f3a50b53b3c99d854f"},"schema_version":"1.0"},"canonical_sha256":"7753b99d452fef34429ccde82102975cf7d79f50f9dcce107fb87fcb8199254d","source":{"kind":"arxiv","id":"1602.02027","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.02027","created_at":"2026-05-18T01:00:39Z"},{"alias_kind":"arxiv_version","alias_value":"1602.02027v2","created_at":"2026-05-18T01:00:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.02027","created_at":"2026-05-18T01:00:39Z"},{"alias_kind":"pith_short_12","alias_value":"O5J3THKFF7XT","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"O5J3THKFF7XTIQU4","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"O5J3THKF","created_at":"2026-05-18T12:30:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:O5J3THKFF7XTIQU4ZXUCCAUXLT","target":"record","payload":{"canonical_record":{"source":{"id":"1602.02027","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-02-05T14:14:23Z","cross_cats_sorted":[],"title_canon_sha256":"ffe1fe4a45d64853c83371d5b0b501f434ba6b726bad2e8c167d8181303d9864","abstract_canon_sha256":"2f5a1937dfe69cf149533d03b15c152de342b767d88959f3a50b53b3c99d854f"},"schema_version":"1.0"},"canonical_sha256":"7753b99d452fef34429ccde82102975cf7d79f50f9dcce107fb87fcb8199254d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:00:39.771016Z","signature_b64":"N9tu6ZE5a1mFYaRcXJuM4OYCWI3YFv1JhQF4StOTyVFQc2f4e31jSljtHiUQqPNCple7H4UzATICOduYKINbAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7753b99d452fef34429ccde82102975cf7d79f50f9dcce107fb87fcb8199254d","last_reissued_at":"2026-05-18T01:00:39.770413Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:00:39.770413Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1602.02027","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:00:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oIymeccUITAvleljxBi/vP9uzYy+qXjurkq314qiITV3enwNG6+yaocQqnO86J2ypsRJEsVfzf+M4Tdlji5eCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T04:20:53.365139Z"},"content_sha256":"286913cccb9e95367ebd898583c3bb733cf20c7dad9c0d3e60b1f130f4e3de38","schema_version":"1.0","event_id":"sha256:286913cccb9e95367ebd898583c3bb733cf20c7dad9c0d3e60b1f130f4e3de38"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:O5J3THKFF7XTIQU4ZXUCCAUXLT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Adjoint Operator in Photoacoustic Tomography","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.NA","authors_text":"Ben T. Cox, Brad E. Treeby, Felix Lucka, Marta M. Betcke, Simon R. Arridge","submitted_at":"2016-02-05T14:14:23Z","abstract_excerpt":"Photoacoustic Tomography (PAT) is an emerging biomedical \"imaging from coupled physics\" technique, in which the image contrast is due to optical absorption, but the information is carried to the surface of the tissue as ultrasound pulses. Many algorithms and formulae for PAT image reconstruction have been proposed for the case when a complete data set is available. In many practical imaging scenarios, however, it is not possible to obtain the full data, or the data may be sub-sampled for faster data acquisition. In such cases, image reconstruction algorithms that can incorporate prior knowledg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.02027","kind":"arxiv","version":2},"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":"2026-05-18T01:00:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t7leFuXe7/BUXX+WU/emH9IAylusTlSP7cg2OmIB4C7BfaVhPwofme0M1VdEp1iv27Sb7YNxWnLpAwqQ5yslCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T04:20:53.365957Z"},"content_sha256":"629283f400511713afef77cd7a27dc48e82adb6e5e7987b098e1c70610d5bbc7","schema_version":"1.0","event_id":"sha256:629283f400511713afef77cd7a27dc48e82adb6e5e7987b098e1c70610d5bbc7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O5J3THKFF7XTIQU4ZXUCCAUXLT/bundle.json","state_url":"https://pith.science/pith/O5J3THKFF7XTIQU4ZXUCCAUXLT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O5J3THKFF7XTIQU4ZXUCCAUXLT/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":"2026-05-31T04:20:53Z","links":{"resolver":"https://pith.science/pith/O5J3THKFF7XTIQU4ZXUCCAUXLT","bundle":"https://pith.science/pith/O5J3THKFF7XTIQU4ZXUCCAUXLT/bundle.json","state":"https://pith.science/pith/O5J3THKFF7XTIQU4ZXUCCAUXLT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O5J3THKFF7XTIQU4ZXUCCAUXLT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:O5J3THKFF7XTIQU4ZXUCCAUXLT","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":"2f5a1937dfe69cf149533d03b15c152de342b767d88959f3a50b53b3c99d854f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-02-05T14:14:23Z","title_canon_sha256":"ffe1fe4a45d64853c83371d5b0b501f434ba6b726bad2e8c167d8181303d9864"},"schema_version":"1.0","source":{"id":"1602.02027","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.02027","created_at":"2026-05-18T01:00:39Z"},{"alias_kind":"arxiv_version","alias_value":"1602.02027v2","created_at":"2026-05-18T01:00:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.02027","created_at":"2026-05-18T01:00:39Z"},{"alias_kind":"pith_short_12","alias_value":"O5J3THKFF7XT","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"O5J3THKFF7XTIQU4","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"O5J3THKF","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:629283f400511713afef77cd7a27dc48e82adb6e5e7987b098e1c70610d5bbc7","target":"graph","created_at":"2026-05-18T01:00:39Z","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":"Photoacoustic Tomography (PAT) is an emerging biomedical \"imaging from coupled physics\" technique, in which the image contrast is due to optical absorption, but the information is carried to the surface of the tissue as ultrasound pulses. Many algorithms and formulae for PAT image reconstruction have been proposed for the case when a complete data set is available. In many practical imaging scenarios, however, it is not possible to obtain the full data, or the data may be sub-sampled for faster data acquisition. In such cases, image reconstruction algorithms that can incorporate prior knowledg","authors_text":"Ben T. Cox, Brad E. Treeby, Felix Lucka, Marta M. Betcke, Simon R. Arridge","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-02-05T14:14:23Z","title":"On the Adjoint Operator in Photoacoustic Tomography"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.02027","kind":"arxiv","version":2},"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":"sha256:286913cccb9e95367ebd898583c3bb733cf20c7dad9c0d3e60b1f130f4e3de38","target":"record","created_at":"2026-05-18T01:00:39Z","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":"2f5a1937dfe69cf149533d03b15c152de342b767d88959f3a50b53b3c99d854f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-02-05T14:14:23Z","title_canon_sha256":"ffe1fe4a45d64853c83371d5b0b501f434ba6b726bad2e8c167d8181303d9864"},"schema_version":"1.0","source":{"id":"1602.02027","kind":"arxiv","version":2}},"canonical_sha256":"7753b99d452fef34429ccde82102975cf7d79f50f9dcce107fb87fcb8199254d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7753b99d452fef34429ccde82102975cf7d79f50f9dcce107fb87fcb8199254d","first_computed_at":"2026-05-18T01:00:39.770413Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:00:39.770413Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"N9tu6ZE5a1mFYaRcXJuM4OYCWI3YFv1JhQF4StOTyVFQc2f4e31jSljtHiUQqPNCple7H4UzATICOduYKINbAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:00:39.771016Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.02027","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:286913cccb9e95367ebd898583c3bb733cf20c7dad9c0d3e60b1f130f4e3de38","sha256:629283f400511713afef77cd7a27dc48e82adb6e5e7987b098e1c70610d5bbc7"],"state_sha256":"7e452b204e6ebc0a72466886f5b28d1b773530432bbd026b09484a6be9de94c4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"213KNwh4m5dw3Dv0mm3ScOVfn4OGY7H1VIO67/FRdTHyvMPzMAbogNk4jS9AhhQ3VBpSOK5vXZiwxRq1v9bkAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T04:20:53.369810Z","bundle_sha256":"08b76ba637126e2d70cb58db05527d2ee1a8195495063d25b7747ef95763dca9"}}