{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:BKL4XY3TNHCASOLMC3OMEPTR5O","short_pith_number":"pith:BKL4XY3T","canonical_record":{"source":{"id":"1609.07586","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2016-09-24T09:04:16Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"4b098bed9138f5175f64d58684b40571682f83660d2c46adc1eec617d00a21e8","abstract_canon_sha256":"2d2e2b9d7fa7bf800edd7c4fe0beb614b4db2677412dea111e7419e94a4836d0"},"schema_version":"1.0"},"canonical_sha256":"0a97cbe37369c409396c16dcc23e71eba4f76db307bb73a1607630c02ff1bb38","source":{"kind":"arxiv","id":"1609.07586","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.07586","created_at":"2026-05-18T01:03:56Z"},{"alias_kind":"arxiv_version","alias_value":"1609.07586v1","created_at":"2026-05-18T01:03:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.07586","created_at":"2026-05-18T01:03:56Z"},{"alias_kind":"pith_short_12","alias_value":"BKL4XY3TNHCA","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"BKL4XY3TNHCASOLM","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"BKL4XY3T","created_at":"2026-05-18T12:30:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:BKL4XY3TNHCASOLMC3OMEPTR5O","target":"record","payload":{"canonical_record":{"source":{"id":"1609.07586","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2016-09-24T09:04:16Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"4b098bed9138f5175f64d58684b40571682f83660d2c46adc1eec617d00a21e8","abstract_canon_sha256":"2d2e2b9d7fa7bf800edd7c4fe0beb614b4db2677412dea111e7419e94a4836d0"},"schema_version":"1.0"},"canonical_sha256":"0a97cbe37369c409396c16dcc23e71eba4f76db307bb73a1607630c02ff1bb38","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:03:56.008246Z","signature_b64":"N9YZoM8IQWSPalXim5vpmFhQnZjA0Ew+qu0RKGBxRSVfUlY6nUlTvC6lLxR0UGcXmuZG0j2HeWR9hbyGs97VCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0a97cbe37369c409396c16dcc23e71eba4f76db307bb73a1607630c02ff1bb38","last_reissued_at":"2026-05-18T01:03:56.007610Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:03:56.007610Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.07586","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":"2026-05-18T01:03:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0wLkiRbWykz7mQvMD0OGEZbv8Cz5fHqrwMk0A6QdSNVlhfVj/PwpH5ZfBSTFQ2PrWzXnjwE8JV+O/gKnhWpYDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T21:33:09.526573Z"},"content_sha256":"da6deb9d975afdf71a7bab67477777c5386380ffadd451ab09e01ede05f21e00","schema_version":"1.0","event_id":"sha256:da6deb9d975afdf71a7bab67477777c5386380ffadd451ab09e01ede05f21e00"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:BKL4XY3TNHCASOLMC3OMEPTR5O","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The reconstruction of sound speed in the Marmousi model by the boundary control method","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"physics.geo-ph","authors_text":"I. B. Ivanov, M. I. Belishev, V. S. Semenov","submitted_at":"2016-09-24T09:04:16Z","abstract_excerpt":"We present the results on numerical testing of the Boundary Control Method in the sound speed determination for the acoustic equation on semiplane. This method for solving multidimensional inverse problems requires no a priory information about the parameters under reconstruction. The application to the realistic Marmousi model demonstrates that the boundary control method is workable in the case of complicated and irregular field of acoustic rays. By the use of the chosen boundary controls, an `averaged' profile of the sound speed is recovered (the relative error is about $10-15\\%$). Such a p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.07586","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":"2026-05-18T01:03:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/W5spBBqWQ0LLeBE0m0NFD54CLrHWvgJr5yBGtXn947KeatkXhNGM7ygbPZPCY5IeTepzjZNJKk/j5iJ2FeiAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T21:33:09.526915Z"},"content_sha256":"8706edbd7a3d19b8004f5bbfc771ac083901cc86e6e1d74fd6ef48f24839753b","schema_version":"1.0","event_id":"sha256:8706edbd7a3d19b8004f5bbfc771ac083901cc86e6e1d74fd6ef48f24839753b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BKL4XY3TNHCASOLMC3OMEPTR5O/bundle.json","state_url":"https://pith.science/pith/BKL4XY3TNHCASOLMC3OMEPTR5O/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BKL4XY3TNHCASOLMC3OMEPTR5O/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":"2026-06-20T21:33:09Z","links":{"resolver":"https://pith.science/pith/BKL4XY3TNHCASOLMC3OMEPTR5O","bundle":"https://pith.science/pith/BKL4XY3TNHCASOLMC3OMEPTR5O/bundle.json","state":"https://pith.science/pith/BKL4XY3TNHCASOLMC3OMEPTR5O/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BKL4XY3TNHCASOLMC3OMEPTR5O/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:BKL4XY3TNHCASOLMC3OMEPTR5O","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":"2d2e2b9d7fa7bf800edd7c4fe0beb614b4db2677412dea111e7419e94a4836d0","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2016-09-24T09:04:16Z","title_canon_sha256":"4b098bed9138f5175f64d58684b40571682f83660d2c46adc1eec617d00a21e8"},"schema_version":"1.0","source":{"id":"1609.07586","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.07586","created_at":"2026-05-18T01:03:56Z"},{"alias_kind":"arxiv_version","alias_value":"1609.07586v1","created_at":"2026-05-18T01:03:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.07586","created_at":"2026-05-18T01:03:56Z"},{"alias_kind":"pith_short_12","alias_value":"BKL4XY3TNHCA","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"BKL4XY3TNHCASOLM","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"BKL4XY3T","created_at":"2026-05-18T12:30:07Z"}],"graph_snapshots":[{"event_id":"sha256:8706edbd7a3d19b8004f5bbfc771ac083901cc86e6e1d74fd6ef48f24839753b","target":"graph","created_at":"2026-05-18T01:03:56Z","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":"We present the results on numerical testing of the Boundary Control Method in the sound speed determination for the acoustic equation on semiplane. This method for solving multidimensional inverse problems requires no a priory information about the parameters under reconstruction. The application to the realistic Marmousi model demonstrates that the boundary control method is workable in the case of complicated and irregular field of acoustic rays. By the use of the chosen boundary controls, an `averaged' profile of the sound speed is recovered (the relative error is about $10-15\\%$). Such a p","authors_text":"I. B. Ivanov, M. I. Belishev, V. S. Semenov","cross_cats":["physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2016-09-24T09:04:16Z","title":"The reconstruction of sound speed in the Marmousi model by the boundary control method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.07586","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:da6deb9d975afdf71a7bab67477777c5386380ffadd451ab09e01ede05f21e00","target":"record","created_at":"2026-05-18T01:03:56Z","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":"2d2e2b9d7fa7bf800edd7c4fe0beb614b4db2677412dea111e7419e94a4836d0","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2016-09-24T09:04:16Z","title_canon_sha256":"4b098bed9138f5175f64d58684b40571682f83660d2c46adc1eec617d00a21e8"},"schema_version":"1.0","source":{"id":"1609.07586","kind":"arxiv","version":1}},"canonical_sha256":"0a97cbe37369c409396c16dcc23e71eba4f76db307bb73a1607630c02ff1bb38","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0a97cbe37369c409396c16dcc23e71eba4f76db307bb73a1607630c02ff1bb38","first_computed_at":"2026-05-18T01:03:56.007610Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:03:56.007610Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"N9YZoM8IQWSPalXim5vpmFhQnZjA0Ew+qu0RKGBxRSVfUlY6nUlTvC6lLxR0UGcXmuZG0j2HeWR9hbyGs97VCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:03:56.008246Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.07586","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:da6deb9d975afdf71a7bab67477777c5386380ffadd451ab09e01ede05f21e00","sha256:8706edbd7a3d19b8004f5bbfc771ac083901cc86e6e1d74fd6ef48f24839753b"],"state_sha256":"093b6247175e303e9360d85587acaca7ead7a6bd7db844fb7b611ec1f3346f5a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"THehqyxNWnypZlNVqyyNu/sALd4PViVb2amfkU2vHdf6avfzlXhRV0fG0WqjsDIfvuIo15j3Fhy7PmaTb7JrAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T21:33:09.528835Z","bundle_sha256":"e59467a52526cfd60b7cf3054637d47dbdc4cbf0c5a307ccc2e29b95363c6333"}}