{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:QXXSBVXELCABKSAD5XZWVECATG","short_pith_number":"pith:QXXSBVXE","canonical_record":{"source":{"id":"1908.07756","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-08-21T09:12:55Z","cross_cats_sorted":[],"title_canon_sha256":"01204bea1f3eb91b6551ab447fedc7c616c04256c9a8ea58c64cd9ce18fd1745","abstract_canon_sha256":"920c711ba105e3e4026af53a6ab7b508f4fe99392521d729d33ede015ff7c33e"},"schema_version":"1.0"},"canonical_sha256":"85ef20d6e45880154803edf36a904099a59ab7e006b5b421a9c9d57ae6235fb4","source":{"kind":"arxiv","id":"1908.07756","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07756","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07756v1","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07756","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"pith_short_12","alias_value":"QXXSBVXELCAB","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"pith_short_16","alias_value":"QXXSBVXELCABKSAD","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"pith_short_8","alias_value":"QXXSBVXE","created_at":"2026-07-04T23:59:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:QXXSBVXELCABKSAD5XZWVECATG","target":"record","payload":{"canonical_record":{"source":{"id":"1908.07756","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-08-21T09:12:55Z","cross_cats_sorted":[],"title_canon_sha256":"01204bea1f3eb91b6551ab447fedc7c616c04256c9a8ea58c64cd9ce18fd1745","abstract_canon_sha256":"920c711ba105e3e4026af53a6ab7b508f4fe99392521d729d33ede015ff7c33e"},"schema_version":"1.0"},"canonical_sha256":"85ef20d6e45880154803edf36a904099a59ab7e006b5b421a9c9d57ae6235fb4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:59:00.921180Z","signature_b64":"+dWQx3zVylkhy5zJVeQx/74o6yMjri/GsxHSsEmFC+yA/ldB2u7z+f0SBzxxnGalYxULfPnFWw+LYMJBO1VfDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"85ef20d6e45880154803edf36a904099a59ab7e006b5b421a9c9d57ae6235fb4","last_reissued_at":"2026-07-04T23:59:00.920793Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:59:00.920793Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.07756","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":"2026-07-04T23:59:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Sx1eWodKGYcdVMf88TBV+/pzXZlbiIseb54AEgG6+K+Ed1rL5NmiyO9IRGuZ+5snsraZRpq4w+9qv/awGbtLAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T17:23:07.489909Z"},"content_sha256":"06c31ae82a241b7d993fef3b2237320739b9cb5eca93f9c418c2c023f8748eb1","schema_version":"1.0","event_id":"sha256:06c31ae82a241b7d993fef3b2237320739b9cb5eca93f9c418c2c023f8748eb1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:QXXSBVXELCABKSAD5XZWVECATG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gravity inversion using a directional filtering method","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.geo-ph","authors_text":"Orlando Silva, Pedro Nogueira","submitted_at":"2019-08-21T09:12:55Z","abstract_excerpt":"The calculation of the underground density field from measured gravity data has been done by a variety of methods of varied types. The use of the vector gravity components is here addressed in order to develop one accurate gravity inversion method. The equation to directly calculate the Cartesian components of the gravity field from the density field is transformed in one non-exact correction equation. The discrete vector equations are transformed into scalar equations by using one vector function as directional filter. The used equations have the property that the convergence of the calculate"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07756","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.07756/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T23:59:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GVnUmL9f6+MO6gtXoXPAt95wqwXTXXM7Rzq8sj8khnU+yOaH3VqJc3vrtGv7BsTNafV985Aoe2xM+3Yyp60MAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T17:23:07.490507Z"},"content_sha256":"ff99d48cf7c671134ed65ef8c22fbca5049ae79b41fa2ae744970079dc2feb67","schema_version":"1.0","event_id":"sha256:ff99d48cf7c671134ed65ef8c22fbca5049ae79b41fa2ae744970079dc2feb67"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QXXSBVXELCABKSAD5XZWVECATG/bundle.json","state_url":"https://pith.science/pith/QXXSBVXELCABKSAD5XZWVECATG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QXXSBVXELCABKSAD5XZWVECATG/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":"2026-08-16T17:23:07Z","links":{"resolver":"https://pith.science/pith/QXXSBVXELCABKSAD5XZWVECATG","bundle":"https://pith.science/pith/QXXSBVXELCABKSAD5XZWVECATG/bundle.json","state":"https://pith.science/pith/QXXSBVXELCABKSAD5XZWVECATG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QXXSBVXELCABKSAD5XZWVECATG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:QXXSBVXELCABKSAD5XZWVECATG","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":"920c711ba105e3e4026af53a6ab7b508f4fe99392521d729d33ede015ff7c33e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-08-21T09:12:55Z","title_canon_sha256":"01204bea1f3eb91b6551ab447fedc7c616c04256c9a8ea58c64cd9ce18fd1745"},"schema_version":"1.0","source":{"id":"1908.07756","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07756","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07756v1","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07756","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"pith_short_12","alias_value":"QXXSBVXELCAB","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"pith_short_16","alias_value":"QXXSBVXELCABKSAD","created_at":"2026-07-04T23:59:00Z"},{"alias_kind":"pith_short_8","alias_value":"QXXSBVXE","created_at":"2026-07-04T23:59:00Z"}],"graph_snapshots":[{"event_id":"sha256:ff99d48cf7c671134ed65ef8c22fbca5049ae79b41fa2ae744970079dc2feb67","target":"graph","created_at":"2026-07-04T23:59:00Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.07756/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The calculation of the underground density field from measured gravity data has been done by a variety of methods of varied types. The use of the vector gravity components is here addressed in order to develop one accurate gravity inversion method. The equation to directly calculate the Cartesian components of the gravity field from the density field is transformed in one non-exact correction equation. The discrete vector equations are transformed into scalar equations by using one vector function as directional filter. The used equations have the property that the convergence of the calculate","authors_text":"Orlando Silva, Pedro Nogueira","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-08-21T09:12:55Z","title":"Gravity inversion using a directional filtering method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07756","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":"sha256:06c31ae82a241b7d993fef3b2237320739b9cb5eca93f9c418c2c023f8748eb1","target":"record","created_at":"2026-07-04T23:59:00Z","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":"920c711ba105e3e4026af53a6ab7b508f4fe99392521d729d33ede015ff7c33e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-08-21T09:12:55Z","title_canon_sha256":"01204bea1f3eb91b6551ab447fedc7c616c04256c9a8ea58c64cd9ce18fd1745"},"schema_version":"1.0","source":{"id":"1908.07756","kind":"arxiv","version":1}},"canonical_sha256":"85ef20d6e45880154803edf36a904099a59ab7e006b5b421a9c9d57ae6235fb4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"85ef20d6e45880154803edf36a904099a59ab7e006b5b421a9c9d57ae6235fb4","first_computed_at":"2026-07-04T23:59:00.920793Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:59:00.920793Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+dWQx3zVylkhy5zJVeQx/74o6yMjri/GsxHSsEmFC+yA/ldB2u7z+f0SBzxxnGalYxULfPnFWw+LYMJBO1VfDQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:59:00.921180Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.07756","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:06c31ae82a241b7d993fef3b2237320739b9cb5eca93f9c418c2c023f8748eb1","sha256:ff99d48cf7c671134ed65ef8c22fbca5049ae79b41fa2ae744970079dc2feb67"],"state_sha256":"99c12e11bd4e4282c6a39a4db3321e6dc388f17819ee96fe739a3dae0b0d022e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jAsnXcbXPOdIjMd1dnVE4b1ydUVcevEx9Ng2K48sAr3RJ0SnTuiml8DbJSQhK6aR2rqOMIgBFo99Qx19ze1BBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T17:23:07.494339Z","bundle_sha256":"aad67d2d82b33b87f5f7f6da34387ed49ff1c924418f615850ff958a62d91d63"}}