{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:YCQXNPSWBAOT27HJ2FUZGUPK4Z","short_pith_number":"pith:YCQXNPSW","canonical_record":{"source":{"id":"1109.3194","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-09-14T20:00:39Z","cross_cats_sorted":[],"title_canon_sha256":"c33828dbef105ab2d05bf917e960051e0c02f1d5a29ffba781501b3590d49209","abstract_canon_sha256":"aa2cef66b5c910c3f8d499740d0a5c5d62b534b1d55c8cf14cb22e3b7a6442e2"},"schema_version":"1.0"},"canonical_sha256":"c0a176be56081d3d7ce9d1699351eae66f89a57ec349af601e874f4478ec1245","source":{"kind":"arxiv","id":"1109.3194","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.3194","created_at":"2026-05-18T02:00:32Z"},{"alias_kind":"arxiv_version","alias_value":"1109.3194v1","created_at":"2026-05-18T02:00:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.3194","created_at":"2026-05-18T02:00:32Z"},{"alias_kind":"pith_short_12","alias_value":"YCQXNPSWBAOT","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_16","alias_value":"YCQXNPSWBAOT27HJ","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_8","alias_value":"YCQXNPSW","created_at":"2026-05-18T12:26:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:YCQXNPSWBAOT27HJ2FUZGUPK4Z","target":"record","payload":{"canonical_record":{"source":{"id":"1109.3194","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-09-14T20:00:39Z","cross_cats_sorted":[],"title_canon_sha256":"c33828dbef105ab2d05bf917e960051e0c02f1d5a29ffba781501b3590d49209","abstract_canon_sha256":"aa2cef66b5c910c3f8d499740d0a5c5d62b534b1d55c8cf14cb22e3b7a6442e2"},"schema_version":"1.0"},"canonical_sha256":"c0a176be56081d3d7ce9d1699351eae66f89a57ec349af601e874f4478ec1245","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:32.808082Z","signature_b64":"4f0TvvKkiNM+2tzhu8ASx52I0cxlmuu8QoqP8sLVZwLl1FdyBA0cAt4+rG3FhEjbPnqQCk58tA/wqPsLrcxkAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c0a176be56081d3d7ce9d1699351eae66f89a57ec349af601e874f4478ec1245","last_reissued_at":"2026-05-18T02:00:32.807488Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:32.807488Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1109.3194","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":"2026-05-18T02:00:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tM2WSUEj3tCt80+NSoSDSioxRGXCep6hHK1ehrdN5ha8YwE3Dudn2iXtzbq7F/iz3eW1PMRJRBFN/Y1loayDAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T00:16:17.387300Z"},"content_sha256":"91419edb08b99583b57585ab09272401d0f9e8237c2a5e3aa975e8716a9ef25f","schema_version":"1.0","event_id":"sha256:91419edb08b99583b57585ab09272401d0f9e8237c2a5e3aa975e8716a9ef25f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:YCQXNPSWBAOT27HJ2FUZGUPK4Z","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Extreme Physics Explorer and Large Area Micro-Channel Plate Optics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"(2) Leicester University, (3) University Maryland Baltimore County, (4) NASA/MSFC), Brian Ramsey (4) ((1) Smithsonian Astrophysical Observatory, Daniel Patnaude (1), Eric Silver (1), George Fraser (2), Ian Evans (1), Jon Chappell (1), Laura Brenneman (1), Martin Elvis (1), Michael Garcia (1), Ricardo Bruni (1), Richard Willingale (2), Suzanne Romaine (1), T.J. Turner (3)","submitted_at":"2011-09-14T20:00:39Z","abstract_excerpt":"The Extreme Physics Explorer (EPE) is a concept timing/spectroscopy mission that would use micro-channel plate optics (MCPO) to provide 4 square meters effective area focused to ~1 arc-min onto an X-ray calorimeter. We describe science drivers for such a mission, possible designs for the large area MCPO needed for EPE, and the challenges of the large area MCPO design."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.3194","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":"2026-05-18T02:00:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I9BaqzTfGE3jncsbmx9gf5ux5Z/fn/cLuxwkEqsKL7suIg/Dci2b9F9SleIBU2zwK0yQezkf0twCHFjeg+N5CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T00:16:17.387668Z"},"content_sha256":"d033725b327699b98f8213024ec70b505fccd7de4e91ca505c6aae8d5acde5c0","schema_version":"1.0","event_id":"sha256:d033725b327699b98f8213024ec70b505fccd7de4e91ca505c6aae8d5acde5c0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YCQXNPSWBAOT27HJ2FUZGUPK4Z/bundle.json","state_url":"https://pith.science/pith/YCQXNPSWBAOT27HJ2FUZGUPK4Z/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YCQXNPSWBAOT27HJ2FUZGUPK4Z/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":"2026-06-23T00:16:17Z","links":{"resolver":"https://pith.science/pith/YCQXNPSWBAOT27HJ2FUZGUPK4Z","bundle":"https://pith.science/pith/YCQXNPSWBAOT27HJ2FUZGUPK4Z/bundle.json","state":"https://pith.science/pith/YCQXNPSWBAOT27HJ2FUZGUPK4Z/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YCQXNPSWBAOT27HJ2FUZGUPK4Z/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:YCQXNPSWBAOT27HJ2FUZGUPK4Z","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":"aa2cef66b5c910c3f8d499740d0a5c5d62b534b1d55c8cf14cb22e3b7a6442e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-09-14T20:00:39Z","title_canon_sha256":"c33828dbef105ab2d05bf917e960051e0c02f1d5a29ffba781501b3590d49209"},"schema_version":"1.0","source":{"id":"1109.3194","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.3194","created_at":"2026-05-18T02:00:32Z"},{"alias_kind":"arxiv_version","alias_value":"1109.3194v1","created_at":"2026-05-18T02:00:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.3194","created_at":"2026-05-18T02:00:32Z"},{"alias_kind":"pith_short_12","alias_value":"YCQXNPSWBAOT","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_16","alias_value":"YCQXNPSWBAOT27HJ","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_8","alias_value":"YCQXNPSW","created_at":"2026-05-18T12:26:47Z"}],"graph_snapshots":[{"event_id":"sha256:d033725b327699b98f8213024ec70b505fccd7de4e91ca505c6aae8d5acde5c0","target":"graph","created_at":"2026-05-18T02:00:32Z","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":"The Extreme Physics Explorer (EPE) is a concept timing/spectroscopy mission that would use micro-channel plate optics (MCPO) to provide 4 square meters effective area focused to ~1 arc-min onto an X-ray calorimeter. We describe science drivers for such a mission, possible designs for the large area MCPO needed for EPE, and the challenges of the large area MCPO design.","authors_text":"(2) Leicester University, (3) University Maryland Baltimore County, (4) NASA/MSFC), Brian Ramsey (4) ((1) Smithsonian Astrophysical Observatory, Daniel Patnaude (1), Eric Silver (1), George Fraser (2), Ian Evans (1), Jon Chappell (1), Laura Brenneman (1), Martin Elvis (1), Michael Garcia (1), Ricardo Bruni (1), Richard Willingale (2), Suzanne Romaine (1), T.J. Turner (3)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-09-14T20:00:39Z","title":"The Extreme Physics Explorer and Large Area Micro-Channel Plate Optics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.3194","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":"sha256:91419edb08b99583b57585ab09272401d0f9e8237c2a5e3aa975e8716a9ef25f","target":"record","created_at":"2026-05-18T02:00:32Z","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":"aa2cef66b5c910c3f8d499740d0a5c5d62b534b1d55c8cf14cb22e3b7a6442e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-09-14T20:00:39Z","title_canon_sha256":"c33828dbef105ab2d05bf917e960051e0c02f1d5a29ffba781501b3590d49209"},"schema_version":"1.0","source":{"id":"1109.3194","kind":"arxiv","version":1}},"canonical_sha256":"c0a176be56081d3d7ce9d1699351eae66f89a57ec349af601e874f4478ec1245","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c0a176be56081d3d7ce9d1699351eae66f89a57ec349af601e874f4478ec1245","first_computed_at":"2026-05-18T02:00:32.807488Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:32.807488Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4f0TvvKkiNM+2tzhu8ASx52I0cxlmuu8QoqP8sLVZwLl1FdyBA0cAt4+rG3FhEjbPnqQCk58tA/wqPsLrcxkAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:32.808082Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.3194","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:91419edb08b99583b57585ab09272401d0f9e8237c2a5e3aa975e8716a9ef25f","sha256:d033725b327699b98f8213024ec70b505fccd7de4e91ca505c6aae8d5acde5c0"],"state_sha256":"aee91b240ae7d50a9b327ae3878cb3b0de02f8b22a621f95f5b7dc29a5af6ba7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Va/+QGXOMWhQp7rv3M59y8Scm2xN0wYtpWQXRLL8HkQy9jC4qL0yFVAPyFfsZDwv6+ERI6Mr+1UHB7Dg1NpqCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T00:16:17.389709Z","bundle_sha256":"ac37f68f7c4bfcca476598d79b3ff32669e1b790d2c8b8cf45dfc5435a5a2a58"}}