{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:NPQBMNOXLJWS7TODSTGSA3VLD4","short_pith_number":"pith:NPQBMNOX","canonical_record":{"source":{"id":"1204.1341","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-04-05T20:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"34a735094b3991af698c26b3d31b25c9c3ec844f31b6978a4fa2e12608539dd4","abstract_canon_sha256":"f5a133bdce433a9182c24e0cc9114e0c7ec04845add885c1cbc85cc7e43ecffe"},"schema_version":"1.0"},"canonical_sha256":"6be01635d75a6d2fcdc394cd206eab1f05b03bed7b0c7f2a370aa8c05d9734da","source":{"kind":"arxiv","id":"1204.1341","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.1341","created_at":"2026-05-18T01:57:56Z"},{"alias_kind":"arxiv_version","alias_value":"1204.1341v1","created_at":"2026-05-18T01:57:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.1341","created_at":"2026-05-18T01:57:56Z"},{"alias_kind":"pith_short_12","alias_value":"NPQBMNOXLJWS","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"NPQBMNOXLJWS7TOD","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"NPQBMNOX","created_at":"2026-05-18T12:27:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:NPQBMNOXLJWS7TODSTGSA3VLD4","target":"record","payload":{"canonical_record":{"source":{"id":"1204.1341","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-04-05T20:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"34a735094b3991af698c26b3d31b25c9c3ec844f31b6978a4fa2e12608539dd4","abstract_canon_sha256":"f5a133bdce433a9182c24e0cc9114e0c7ec04845add885c1cbc85cc7e43ecffe"},"schema_version":"1.0"},"canonical_sha256":"6be01635d75a6d2fcdc394cd206eab1f05b03bed7b0c7f2a370aa8c05d9734da","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:56.469946Z","signature_b64":"WotgHBTtxdIVsRlvx88t0ZUWO/ifIN8fIFgs4L8KP8a/01qp0iNKrd/YN35AVog7zpkdsxRCYBIA6zgH0855Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6be01635d75a6d2fcdc394cd206eab1f05b03bed7b0c7f2a370aa8c05d9734da","last_reissued_at":"2026-05-18T01:57:56.469485Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:56.469485Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.1341","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":"2026-05-18T01:57:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c6qZPz15kXX0+HMvRvC7Q2kMP2cI6QfUixVoT61QdgjU3afSqAvfQaV/T4IDwD6abOOXwsmlq7UUT4Ycts8fDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T03:14:51.545345Z"},"content_sha256":"0f5aa699a7e8ec8c0093bed66814f98de01630eada947cc7c13aae3ec8fab0f8","schema_version":"1.0","event_id":"sha256:0f5aa699a7e8ec8c0093bed66814f98de01630eada947cc7c13aae3ec8fab0f8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:NPQBMNOXLJWS7TODSTGSA3VLD4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Light Echoes of Transients and Variables in the Local Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Rest, B. Sinnott, D. L. Welch","submitted_at":"2012-04-05T20:00:02Z","abstract_excerpt":"Astronomical light echoes, the time-dependent light scattered by dust in the vicinity of varying objects, have been recognized for over a century. Initially, their utility was thought to be confined to mapping out the three-dimensional distribution of interstellar dust. Recently, the discovery of spectroscopically-useful light echoes around centuries-old supernovae in the Milky Way and the Large Magellanic Cloud has opened up new scientific opportunities to exploit light echoes.\n  In this review, we describe the history of light echoes in the local Universe and cover the many new developments "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.1341","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":"2026-05-18T01:57:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F+Ogayum23R9Da9CmHr7eJvXIX3idO3G9SH0l//B+v0S+fpuQe5tLrdVrksMeEmiUedg7INlQp97st3agbLTDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T03:14:51.546103Z"},"content_sha256":"13be50e70b7fd99bfd5e4416ddc9ac354a22a7d632008ac3a2ee5802f45c6e7c","schema_version":"1.0","event_id":"sha256:13be50e70b7fd99bfd5e4416ddc9ac354a22a7d632008ac3a2ee5802f45c6e7c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NPQBMNOXLJWS7TODSTGSA3VLD4/bundle.json","state_url":"https://pith.science/pith/NPQBMNOXLJWS7TODSTGSA3VLD4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NPQBMNOXLJWS7TODSTGSA3VLD4/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":"2026-05-23T03:14:51Z","links":{"resolver":"https://pith.science/pith/NPQBMNOXLJWS7TODSTGSA3VLD4","bundle":"https://pith.science/pith/NPQBMNOXLJWS7TODSTGSA3VLD4/bundle.json","state":"https://pith.science/pith/NPQBMNOXLJWS7TODSTGSA3VLD4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NPQBMNOXLJWS7TODSTGSA3VLD4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:NPQBMNOXLJWS7TODSTGSA3VLD4","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":"f5a133bdce433a9182c24e0cc9114e0c7ec04845add885c1cbc85cc7e43ecffe","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-04-05T20:00:02Z","title_canon_sha256":"34a735094b3991af698c26b3d31b25c9c3ec844f31b6978a4fa2e12608539dd4"},"schema_version":"1.0","source":{"id":"1204.1341","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.1341","created_at":"2026-05-18T01:57:56Z"},{"alias_kind":"arxiv_version","alias_value":"1204.1341v1","created_at":"2026-05-18T01:57:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.1341","created_at":"2026-05-18T01:57:56Z"},{"alias_kind":"pith_short_12","alias_value":"NPQBMNOXLJWS","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"NPQBMNOXLJWS7TOD","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"NPQBMNOX","created_at":"2026-05-18T12:27:16Z"}],"graph_snapshots":[{"event_id":"sha256:13be50e70b7fd99bfd5e4416ddc9ac354a22a7d632008ac3a2ee5802f45c6e7c","target":"graph","created_at":"2026-05-18T01:57:56Z","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":"Astronomical light echoes, the time-dependent light scattered by dust in the vicinity of varying objects, have been recognized for over a century. Initially, their utility was thought to be confined to mapping out the three-dimensional distribution of interstellar dust. Recently, the discovery of spectroscopically-useful light echoes around centuries-old supernovae in the Milky Way and the Large Magellanic Cloud has opened up new scientific opportunities to exploit light echoes.\n  In this review, we describe the history of light echoes in the local Universe and cover the many new developments ","authors_text":"A. Rest, B. Sinnott, D. L. Welch","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-04-05T20:00:02Z","title":"Light Echoes of Transients and Variables in the Local Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.1341","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":"sha256:0f5aa699a7e8ec8c0093bed66814f98de01630eada947cc7c13aae3ec8fab0f8","target":"record","created_at":"2026-05-18T01:57:56Z","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":"f5a133bdce433a9182c24e0cc9114e0c7ec04845add885c1cbc85cc7e43ecffe","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-04-05T20:00:02Z","title_canon_sha256":"34a735094b3991af698c26b3d31b25c9c3ec844f31b6978a4fa2e12608539dd4"},"schema_version":"1.0","source":{"id":"1204.1341","kind":"arxiv","version":1}},"canonical_sha256":"6be01635d75a6d2fcdc394cd206eab1f05b03bed7b0c7f2a370aa8c05d9734da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6be01635d75a6d2fcdc394cd206eab1f05b03bed7b0c7f2a370aa8c05d9734da","first_computed_at":"2026-05-18T01:57:56.469485Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:56.469485Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WotgHBTtxdIVsRlvx88t0ZUWO/ifIN8fIFgs4L8KP8a/01qp0iNKrd/YN35AVog7zpkdsxRCYBIA6zgH0855Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:56.469946Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.1341","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0f5aa699a7e8ec8c0093bed66814f98de01630eada947cc7c13aae3ec8fab0f8","sha256:13be50e70b7fd99bfd5e4416ddc9ac354a22a7d632008ac3a2ee5802f45c6e7c"],"state_sha256":"9e9ebf0486d7faac362fa3abbb6168ba16d8fcc929159dea2f1c9a67621dae0a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ow09RCDSxrV8XxtFswxY4GBJd08nhT9H2rQIx8Ixer8oUkqfMdpNAhhRNF9gDH5OEJuW0y44IWTW4pjx0/X4Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T03:14:51.550299Z","bundle_sha256":"b640d9b9b513d6ebb7d26b546ec08efb2b21a3efa216004afed967d6f1caf648"}}