{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:RT4GEFK47HAWXAOZAWXJZF3M4X","short_pith_number":"pith:RT4GEFK4","canonical_record":{"source":{"id":"2107.07612","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-15T21:16:50Z","cross_cats_sorted":[],"title_canon_sha256":"8b1fa7b7165e29c70bb449b48d1a72bda41cae31bdcf7519b8f610ea36d20757","abstract_canon_sha256":"e578a8429467b62764e67b13f35b3e103ca35c1ea3ce42e8f66715cba8314182"},"schema_version":"1.0"},"canonical_sha256":"8cf862155cf9c16b81d905ae9c976ce5f21d15e171e686702c1d3a8d813495e1","source":{"kind":"arxiv","id":"2107.07612","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.07612","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"arxiv_version","alias_value":"2107.07612v1","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.07612","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"pith_short_12","alias_value":"RT4GEFK47HAW","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"pith_short_16","alias_value":"RT4GEFK47HAWXAOZ","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"pith_short_8","alias_value":"RT4GEFK4","created_at":"2026-07-05T03:21:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:RT4GEFK47HAWXAOZAWXJZF3M4X","target":"record","payload":{"canonical_record":{"source":{"id":"2107.07612","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-15T21:16:50Z","cross_cats_sorted":[],"title_canon_sha256":"8b1fa7b7165e29c70bb449b48d1a72bda41cae31bdcf7519b8f610ea36d20757","abstract_canon_sha256":"e578a8429467b62764e67b13f35b3e103ca35c1ea3ce42e8f66715cba8314182"},"schema_version":"1.0"},"canonical_sha256":"8cf862155cf9c16b81d905ae9c976ce5f21d15e171e686702c1d3a8d813495e1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:21:55.153509Z","signature_b64":"r6494e5girslmvjxtChwC1hd/cIlLShebEa8Ny397IJaqF0iNk4aLl19j8OuZ1nzgZyji6f/YVSh22dwY5EwDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8cf862155cf9c16b81d905ae9c976ce5f21d15e171e686702c1d3a8d813495e1","last_reissued_at":"2026-07-05T03:21:55.153091Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:21:55.153091Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.07612","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":"2026-07-05T03:21:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EXoZ/rjLyBr9CFEqMMkSjPaEI+X0RLn3ydSjfHfD9qhYL9L2uClMGszZp8fGN+eExlKNuG7TNIx0yUTxIOZgDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T05:02:20.674306Z"},"content_sha256":"90ccbdbeef70968437d88095145ceef6bb6c3bd1e16b4dfd2f179ae21a748908","schema_version":"1.0","event_id":"sha256:90ccbdbeef70968437d88095145ceef6bb6c3bd1e16b4dfd2f179ae21a748908"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:RT4GEFK47HAWXAOZAWXJZF3M4X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Understanding Heating in Active Region Cores through Machine Learning II. Classifying Observations","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"N. M. Viall, S. J. Bradshaw, W. T. Barnes","submitted_at":"2021-07-15T21:16:50Z","abstract_excerpt":"Constraining the frequency of energy deposition in magnetically-closed active region cores requires sophisticated hydrodynamic simulations of the coronal plasma and detailed forward modeling of the optically-thin line-of-sight integrated emission. However, understanding which set of model inputs best matches a set of observations is complicated by the need for any proposed heating model to simultaneously satisfy multiple observable constraints. In this paper, we train a random forest classification model on a set of forward-modeled observable quantities, namely the emission measure slope, the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.07612","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/2107.07612/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":"2026-07-05T03:21:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+Qxh1q44oN6CezyXWMFCtr6CuZDqT47wrP4e8OgXDv7d7G33qG///+FDZ1xvtma32LzSBLI4X0xsAzLTDE4jCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T05:02:20.674873Z"},"content_sha256":"55730d07d4b4ac1098855ebf255f387cba2f7622c7b674d6efb4e4870fa911b0","schema_version":"1.0","event_id":"sha256:55730d07d4b4ac1098855ebf255f387cba2f7622c7b674d6efb4e4870fa911b0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RT4GEFK47HAWXAOZAWXJZF3M4X/bundle.json","state_url":"https://pith.science/pith/RT4GEFK47HAWXAOZAWXJZF3M4X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RT4GEFK47HAWXAOZAWXJZF3M4X/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":"2026-08-23T05:02:20Z","links":{"resolver":"https://pith.science/pith/RT4GEFK47HAWXAOZAWXJZF3M4X","bundle":"https://pith.science/pith/RT4GEFK47HAWXAOZAWXJZF3M4X/bundle.json","state":"https://pith.science/pith/RT4GEFK47HAWXAOZAWXJZF3M4X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RT4GEFK47HAWXAOZAWXJZF3M4X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:RT4GEFK47HAWXAOZAWXJZF3M4X","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":"e578a8429467b62764e67b13f35b3e103ca35c1ea3ce42e8f66715cba8314182","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-15T21:16:50Z","title_canon_sha256":"8b1fa7b7165e29c70bb449b48d1a72bda41cae31bdcf7519b8f610ea36d20757"},"schema_version":"1.0","source":{"id":"2107.07612","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.07612","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"arxiv_version","alias_value":"2107.07612v1","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.07612","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"pith_short_12","alias_value":"RT4GEFK47HAW","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"pith_short_16","alias_value":"RT4GEFK47HAWXAOZ","created_at":"2026-07-05T03:21:55Z"},{"alias_kind":"pith_short_8","alias_value":"RT4GEFK4","created_at":"2026-07-05T03:21:55Z"}],"graph_snapshots":[{"event_id":"sha256:55730d07d4b4ac1098855ebf255f387cba2f7622c7b674d6efb4e4870fa911b0","target":"graph","created_at":"2026-07-05T03:21:55Z","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/2107.07612/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Constraining the frequency of energy deposition in magnetically-closed active region cores requires sophisticated hydrodynamic simulations of the coronal plasma and detailed forward modeling of the optically-thin line-of-sight integrated emission. However, understanding which set of model inputs best matches a set of observations is complicated by the need for any proposed heating model to simultaneously satisfy multiple observable constraints. In this paper, we train a random forest classification model on a set of forward-modeled observable quantities, namely the emission measure slope, the ","authors_text":"N. M. Viall, S. J. Bradshaw, W. T. Barnes","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-15T21:16:50Z","title":"Understanding Heating in Active Region Cores through Machine Learning II. Classifying Observations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.07612","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":"sha256:90ccbdbeef70968437d88095145ceef6bb6c3bd1e16b4dfd2f179ae21a748908","target":"record","created_at":"2026-07-05T03:21:55Z","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":"e578a8429467b62764e67b13f35b3e103ca35c1ea3ce42e8f66715cba8314182","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-15T21:16:50Z","title_canon_sha256":"8b1fa7b7165e29c70bb449b48d1a72bda41cae31bdcf7519b8f610ea36d20757"},"schema_version":"1.0","source":{"id":"2107.07612","kind":"arxiv","version":1}},"canonical_sha256":"8cf862155cf9c16b81d905ae9c976ce5f21d15e171e686702c1d3a8d813495e1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8cf862155cf9c16b81d905ae9c976ce5f21d15e171e686702c1d3a8d813495e1","first_computed_at":"2026-07-05T03:21:55.153091Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:21:55.153091Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"r6494e5girslmvjxtChwC1hd/cIlLShebEa8Ny397IJaqF0iNk4aLl19j8OuZ1nzgZyji6f/YVSh22dwY5EwDw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:21:55.153509Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.07612","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:90ccbdbeef70968437d88095145ceef6bb6c3bd1e16b4dfd2f179ae21a748908","sha256:55730d07d4b4ac1098855ebf255f387cba2f7622c7b674d6efb4e4870fa911b0"],"state_sha256":"e00f92661640c3dca502587f3a4fffca537425c685f9888b7ed11de39fda6804"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uDDDWY5l1fwNZ5C5PBIIJQs8yaQgI8E6az50PNa6SF1Laq6BSk2v60zGEU8ag8udnh7APoaK6Zy4AJ29AicTAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T05:02:20.679878Z","bundle_sha256":"7ff6c6e6d3423b3390c5d729c8f9399364d0ca87f2491da1d095f210005cfbc5"}}