{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:VDFI6RD5ZPSSS2KNTCEWVLZ2PP","short_pith_number":"pith:VDFI6RD5","canonical_record":{"source":{"id":"1507.06954","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2015-07-24T18:45:28Z","cross_cats_sorted":["stat.AP"],"title_canon_sha256":"e7a0c7d6a88d206545eddfbcb9e0e59dfb999988660b6f4427785fee96b78b50","abstract_canon_sha256":"8cf5e15afff3bbb8b0f2612dfcc700f60c260e227266d41dfef887cd9069bacd"},"schema_version":"1.0"},"canonical_sha256":"a8ca8f447dcbe529694d98896aaf3a7bf86e822134e1a861826afc8895a5a5a9","source":{"kind":"arxiv","id":"1507.06954","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.06954","created_at":"2026-05-18T01:32:07Z"},{"alias_kind":"arxiv_version","alias_value":"1507.06954v2","created_at":"2026-05-18T01:32:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.06954","created_at":"2026-05-18T01:32:07Z"},{"alias_kind":"pith_short_12","alias_value":"VDFI6RD5ZPSS","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"VDFI6RD5ZPSSS2KN","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"VDFI6RD5","created_at":"2026-05-18T12:29:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:VDFI6RD5ZPSSS2KNTCEWVLZ2PP","target":"record","payload":{"canonical_record":{"source":{"id":"1507.06954","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2015-07-24T18:45:28Z","cross_cats_sorted":["stat.AP"],"title_canon_sha256":"e7a0c7d6a88d206545eddfbcb9e0e59dfb999988660b6f4427785fee96b78b50","abstract_canon_sha256":"8cf5e15afff3bbb8b0f2612dfcc700f60c260e227266d41dfef887cd9069bacd"},"schema_version":"1.0"},"canonical_sha256":"a8ca8f447dcbe529694d98896aaf3a7bf86e822134e1a861826afc8895a5a5a9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:32:07.780007Z","signature_b64":"wQupnrRoYF27D0tY1EwBF+ZFEvz4aQ0D37SQ6vMhDvZRb65DhT6jp03IJvrLFZf+n5kzFSvIDoV9jPpEaWOtDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a8ca8f447dcbe529694d98896aaf3a7bf86e822134e1a861826afc8895a5a5a9","last_reissued_at":"2026-05-18T01:32:07.779267Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:32:07.779267Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.06954","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":"2026-05-18T01:32:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+vpZYOyIFKK9U/fTABqRbRD0OvkvfCagUJ7Artlym7gREKPhsRTllMcRDhMQU2XAVd6R/yAafVWQhufkVuPhAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:21:38.291063Z"},"content_sha256":"b8186272a7e3fa8d908c99fb5145f0828cce9b833d2d69550ef19f88031df443","schema_version":"1.0","event_id":"sha256:b8186272a7e3fa8d908c99fb5145f0828cce9b833d2d69550ef19f88031df443"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:VDFI6RD5ZPSSS2KNTCEWVLZ2PP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Detecting changes in maps of gamma spectra with Kolmogorov-Smirnov tests","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["stat.AP"],"primary_cat":"physics.data-an","authors_text":"Alex Athey, Alex Reinhart, Val\\'erie Ventura","submitted_at":"2015-07-24T18:45:28Z","abstract_excerpt":"Various security, regulatory, and consequence management agencies are interested in continuously monitoring wide areas for unexpected changes in radioactivity. Existing detection systems are designed to search for radioactive sources but are not suited to repeat mapping and change detection. Using a set of daily spectral observations collected at the Pickle Research Campus, we improved on the prior Spectral Comparison Ratio Anomaly Mapping (SCRAM) algorithm and developed a new method based on two-sample Kolmogorov-Smirnov tests to detect sudden spectral changes. We also designed simulations an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.06954","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":"2026-05-18T01:32:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ChpUjtv0xhp33jV1P6eF4J5NfmSTgXidoooOdJE1SZsmcH4yLIYRydbL+rH7agOO+ZWhC3+mduhiVm5pnH/ECA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:21:38.291491Z"},"content_sha256":"ed7dc4e8e60e35c74884b1e773c251626ef056934b9df76eb9662933890b59c4","schema_version":"1.0","event_id":"sha256:ed7dc4e8e60e35c74884b1e773c251626ef056934b9df76eb9662933890b59c4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VDFI6RD5ZPSSS2KNTCEWVLZ2PP/bundle.json","state_url":"https://pith.science/pith/VDFI6RD5ZPSSS2KNTCEWVLZ2PP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VDFI6RD5ZPSSS2KNTCEWVLZ2PP/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":"2026-05-27T18:21:38Z","links":{"resolver":"https://pith.science/pith/VDFI6RD5ZPSSS2KNTCEWVLZ2PP","bundle":"https://pith.science/pith/VDFI6RD5ZPSSS2KNTCEWVLZ2PP/bundle.json","state":"https://pith.science/pith/VDFI6RD5ZPSSS2KNTCEWVLZ2PP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VDFI6RD5ZPSSS2KNTCEWVLZ2PP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:VDFI6RD5ZPSSS2KNTCEWVLZ2PP","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":"8cf5e15afff3bbb8b0f2612dfcc700f60c260e227266d41dfef887cd9069bacd","cross_cats_sorted":["stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2015-07-24T18:45:28Z","title_canon_sha256":"e7a0c7d6a88d206545eddfbcb9e0e59dfb999988660b6f4427785fee96b78b50"},"schema_version":"1.0","source":{"id":"1507.06954","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.06954","created_at":"2026-05-18T01:32:07Z"},{"alias_kind":"arxiv_version","alias_value":"1507.06954v2","created_at":"2026-05-18T01:32:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.06954","created_at":"2026-05-18T01:32:07Z"},{"alias_kind":"pith_short_12","alias_value":"VDFI6RD5ZPSS","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"VDFI6RD5ZPSSS2KN","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"VDFI6RD5","created_at":"2026-05-18T12:29:44Z"}],"graph_snapshots":[{"event_id":"sha256:ed7dc4e8e60e35c74884b1e773c251626ef056934b9df76eb9662933890b59c4","target":"graph","created_at":"2026-05-18T01:32:07Z","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":"Various security, regulatory, and consequence management agencies are interested in continuously monitoring wide areas for unexpected changes in radioactivity. Existing detection systems are designed to search for radioactive sources but are not suited to repeat mapping and change detection. Using a set of daily spectral observations collected at the Pickle Research Campus, we improved on the prior Spectral Comparison Ratio Anomaly Mapping (SCRAM) algorithm and developed a new method based on two-sample Kolmogorov-Smirnov tests to detect sudden spectral changes. We also designed simulations an","authors_text":"Alex Athey, Alex Reinhart, Val\\'erie Ventura","cross_cats":["stat.AP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2015-07-24T18:45:28Z","title":"Detecting changes in maps of gamma spectra with Kolmogorov-Smirnov tests"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.06954","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:b8186272a7e3fa8d908c99fb5145f0828cce9b833d2d69550ef19f88031df443","target":"record","created_at":"2026-05-18T01:32:07Z","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":"8cf5e15afff3bbb8b0f2612dfcc700f60c260e227266d41dfef887cd9069bacd","cross_cats_sorted":["stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2015-07-24T18:45:28Z","title_canon_sha256":"e7a0c7d6a88d206545eddfbcb9e0e59dfb999988660b6f4427785fee96b78b50"},"schema_version":"1.0","source":{"id":"1507.06954","kind":"arxiv","version":2}},"canonical_sha256":"a8ca8f447dcbe529694d98896aaf3a7bf86e822134e1a861826afc8895a5a5a9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a8ca8f447dcbe529694d98896aaf3a7bf86e822134e1a861826afc8895a5a5a9","first_computed_at":"2026-05-18T01:32:07.779267Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:32:07.779267Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wQupnrRoYF27D0tY1EwBF+ZFEvz4aQ0D37SQ6vMhDvZRb65DhT6jp03IJvrLFZf+n5kzFSvIDoV9jPpEaWOtDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:32:07.780007Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.06954","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b8186272a7e3fa8d908c99fb5145f0828cce9b833d2d69550ef19f88031df443","sha256:ed7dc4e8e60e35c74884b1e773c251626ef056934b9df76eb9662933890b59c4"],"state_sha256":"460f25deb0038aa0b16f157d010bdf0ea046245f8271ba2963294d331b6c2e77"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JLPmGKHBrt1V8OsBUUpzdrvLChvesosuYeofsPWo1o7/O6pzilqHhKAncNpEftF+B4ISb+5x1+O55g7Ngy0EAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T18:21:38.294205Z","bundle_sha256":"a58b22bcdeb70860bc861b0341aedc8bb566c1fa3c54cb399bfe0aaa51fc9069"}}