{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:RKUFXSFV56YSSAE3HCQPFZC5D6","short_pith_number":"pith:RKUFXSFV","canonical_record":{"source":{"id":"1105.6344","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2011-05-31T17:17:15Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"c49221898dae2638b97af8558f90c7e8fd965507cac7a3a7ef99b8082587b671","abstract_canon_sha256":"2e9f0c83f5634cc764cd48f0a01a07da534e2c98e680fe40d8ea383ce4b2b91b"},"schema_version":"1.0"},"canonical_sha256":"8aa85bc8b5efb129009b38a0f2e45d1fa9a1a13847451b08d46f5ea4c86f50f6","source":{"kind":"arxiv","id":"1105.6344","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.6344","created_at":"2026-05-18T03:59:47Z"},{"alias_kind":"arxiv_version","alias_value":"1105.6344v3","created_at":"2026-05-18T03:59:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.6344","created_at":"2026-05-18T03:59:47Z"},{"alias_kind":"pith_short_12","alias_value":"RKUFXSFV56YS","created_at":"2026-05-18T12:26:41Z"},{"alias_kind":"pith_short_16","alias_value":"RKUFXSFV56YSSAE3","created_at":"2026-05-18T12:26:41Z"},{"alias_kind":"pith_short_8","alias_value":"RKUFXSFV","created_at":"2026-05-18T12:26:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:RKUFXSFV56YSSAE3HCQPFZC5D6","target":"record","payload":{"canonical_record":{"source":{"id":"1105.6344","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2011-05-31T17:17:15Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"c49221898dae2638b97af8558f90c7e8fd965507cac7a3a7ef99b8082587b671","abstract_canon_sha256":"2e9f0c83f5634cc764cd48f0a01a07da534e2c98e680fe40d8ea383ce4b2b91b"},"schema_version":"1.0"},"canonical_sha256":"8aa85bc8b5efb129009b38a0f2e45d1fa9a1a13847451b08d46f5ea4c86f50f6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:59:47.790162Z","signature_b64":"lD/RlS/3wnr5t6Af0rJHrzTfldymLoDMp5N2JuM0fzXeg77Cj6v8qCj/WlKJf2OdChW+EILNQPeH2M0W6a5rCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8aa85bc8b5efb129009b38a0f2e45d1fa9a1a13847451b08d46f5ea4c86f50f6","last_reissued_at":"2026-05-18T03:59:47.789763Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:59:47.789763Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1105.6344","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:59:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g+yI8pvq4MeugIH7njVHlH/Tihd9UlNdBpM7uPQY8XifT35JkTmKR0i7JAcBLlcEXSmlVArPjm5eJS+gYq03Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T19:55:06.610497Z"},"content_sha256":"4c5dd60f3f336b7334597b4360b8720fb0eb92242e829dab8ff777ef97ceb851","schema_version":"1.0","event_id":"sha256:4c5dd60f3f336b7334597b4360b8720fb0eb92242e829dab8ff777ef97ceb851"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:RKUFXSFV56YSSAE3HCQPFZC5D6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Prototype selection for parameter estimation in complex models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"stat.AP","authors_text":"Ann B. Lee, Chad M. Schafer, Joseph W. Richards, Peter E. Freeman","submitted_at":"2011-05-31T17:17:15Z","abstract_excerpt":"Parameter estimation in astrophysics often requires the use of complex physical models. In this paper we study the problem of estimating the parameters that describe star formation history (SFH) in galaxies. Here, high-dimensional spectral data from galaxies are appropriately modeled as linear combinations of physical components, called simple stellar populations (SSPs), plus some nonlinear distortions. Theoretical data for each SSP is produced for a fixed parameter vector via computer modeling. Though the parameters that define each SSP are continuous, optimizing the signal model over a large"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.6344","kind":"arxiv","version":3},"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":"2026-05-18T03:59:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kit2n/nvJLasEtvKVpVbGTm39C+T7PTztA/nelXWd2N9uoLA3g76jnpNWHLsaDI1EN7uPyAEFRasXODaT+QHCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T19:55:06.611224Z"},"content_sha256":"c18b327d4a1135eac1751cc5689a4321b626c193bca494b173646e35f3b95747","schema_version":"1.0","event_id":"sha256:c18b327d4a1135eac1751cc5689a4321b626c193bca494b173646e35f3b95747"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RKUFXSFV56YSSAE3HCQPFZC5D6/bundle.json","state_url":"https://pith.science/pith/RKUFXSFV56YSSAE3HCQPFZC5D6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RKUFXSFV56YSSAE3HCQPFZC5D6/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":"2026-05-25T19:55:06Z","links":{"resolver":"https://pith.science/pith/RKUFXSFV56YSSAE3HCQPFZC5D6","bundle":"https://pith.science/pith/RKUFXSFV56YSSAE3HCQPFZC5D6/bundle.json","state":"https://pith.science/pith/RKUFXSFV56YSSAE3HCQPFZC5D6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RKUFXSFV56YSSAE3HCQPFZC5D6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:RKUFXSFV56YSSAE3HCQPFZC5D6","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":"2e9f0c83f5634cc764cd48f0a01a07da534e2c98e680fe40d8ea383ce4b2b91b","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2011-05-31T17:17:15Z","title_canon_sha256":"c49221898dae2638b97af8558f90c7e8fd965507cac7a3a7ef99b8082587b671"},"schema_version":"1.0","source":{"id":"1105.6344","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.6344","created_at":"2026-05-18T03:59:47Z"},{"alias_kind":"arxiv_version","alias_value":"1105.6344v3","created_at":"2026-05-18T03:59:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.6344","created_at":"2026-05-18T03:59:47Z"},{"alias_kind":"pith_short_12","alias_value":"RKUFXSFV56YS","created_at":"2026-05-18T12:26:41Z"},{"alias_kind":"pith_short_16","alias_value":"RKUFXSFV56YSSAE3","created_at":"2026-05-18T12:26:41Z"},{"alias_kind":"pith_short_8","alias_value":"RKUFXSFV","created_at":"2026-05-18T12:26:41Z"}],"graph_snapshots":[{"event_id":"sha256:c18b327d4a1135eac1751cc5689a4321b626c193bca494b173646e35f3b95747","target":"graph","created_at":"2026-05-18T03:59:47Z","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":"Parameter estimation in astrophysics often requires the use of complex physical models. In this paper we study the problem of estimating the parameters that describe star formation history (SFH) in galaxies. Here, high-dimensional spectral data from galaxies are appropriately modeled as linear combinations of physical components, called simple stellar populations (SSPs), plus some nonlinear distortions. Theoretical data for each SSP is produced for a fixed parameter vector via computer modeling. Though the parameters that define each SSP are continuous, optimizing the signal model over a large","authors_text":"Ann B. Lee, Chad M. Schafer, Joseph W. Richards, Peter E. Freeman","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2011-05-31T17:17:15Z","title":"Prototype selection for parameter estimation in complex models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.6344","kind":"arxiv","version":3},"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":"sha256:4c5dd60f3f336b7334597b4360b8720fb0eb92242e829dab8ff777ef97ceb851","target":"record","created_at":"2026-05-18T03:59:47Z","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":"2e9f0c83f5634cc764cd48f0a01a07da534e2c98e680fe40d8ea383ce4b2b91b","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2011-05-31T17:17:15Z","title_canon_sha256":"c49221898dae2638b97af8558f90c7e8fd965507cac7a3a7ef99b8082587b671"},"schema_version":"1.0","source":{"id":"1105.6344","kind":"arxiv","version":3}},"canonical_sha256":"8aa85bc8b5efb129009b38a0f2e45d1fa9a1a13847451b08d46f5ea4c86f50f6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8aa85bc8b5efb129009b38a0f2e45d1fa9a1a13847451b08d46f5ea4c86f50f6","first_computed_at":"2026-05-18T03:59:47.789763Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:59:47.789763Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lD/RlS/3wnr5t6Af0rJHrzTfldymLoDMp5N2JuM0fzXeg77Cj6v8qCj/WlKJf2OdChW+EILNQPeH2M0W6a5rCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:59:47.790162Z","signed_message":"canonical_sha256_bytes"},"source_id":"1105.6344","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4c5dd60f3f336b7334597b4360b8720fb0eb92242e829dab8ff777ef97ceb851","sha256:c18b327d4a1135eac1751cc5689a4321b626c193bca494b173646e35f3b95747"],"state_sha256":"1490cfe1cca8af846c3cab375ec927e2ee7d4f638809af4912420cbadd1c089b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8SW35J5XzsWPcerS1DGa5IeNaEbQsGAeK5dVfmsAaJ/4HYrCXu7Qt2RVEQFWYIMNgPPhNcPlIJJwZDteAN2qCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T19:55:06.615391Z","bundle_sha256":"ef5e51094031c033ff877dd0063e2c81604fa7731f70b028c0cbf85828ced224"}}