{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:4CE7IRODZ3NOQ7Y6SI3QLMPKWP","short_pith_number":"pith:4CE7IROD","canonical_record":{"source":{"id":"1705.10681","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-05-30T14:55:38Z","cross_cats_sorted":[],"title_canon_sha256":"29e08d6e0807026aa358e72eea78ee1444a16b9bcfe5536b96ec5a684e034ff6","abstract_canon_sha256":"5e523c2904e193e587ae0a8093049e3121ac99c39294891c92def8f8e52eee9c"},"schema_version":"1.0"},"canonical_sha256":"e089f445c3cedae87f1e923705b1eab3e567b50a022d841c8e75fd8b6188c026","source":{"kind":"arxiv","id":"1705.10681","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.10681","created_at":"2026-05-18T00:39:34Z"},{"alias_kind":"arxiv_version","alias_value":"1705.10681v1","created_at":"2026-05-18T00:39:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.10681","created_at":"2026-05-18T00:39:34Z"},{"alias_kind":"pith_short_12","alias_value":"4CE7IRODZ3NO","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_16","alias_value":"4CE7IRODZ3NOQ7Y6","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_8","alias_value":"4CE7IROD","created_at":"2026-05-18T12:30:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:4CE7IRODZ3NOQ7Y6SI3QLMPKWP","target":"record","payload":{"canonical_record":{"source":{"id":"1705.10681","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-05-30T14:55:38Z","cross_cats_sorted":[],"title_canon_sha256":"29e08d6e0807026aa358e72eea78ee1444a16b9bcfe5536b96ec5a684e034ff6","abstract_canon_sha256":"5e523c2904e193e587ae0a8093049e3121ac99c39294891c92def8f8e52eee9c"},"schema_version":"1.0"},"canonical_sha256":"e089f445c3cedae87f1e923705b1eab3e567b50a022d841c8e75fd8b6188c026","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:39:34.594904Z","signature_b64":"GAFCdrPsn/UacPJ8bBagBsFhf1CJcOJr/g1L4KowHtFfeA7FT8OUEGRTF9Nv0YOxx6XPehY6j+uErJBqrmfrAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e089f445c3cedae87f1e923705b1eab3e567b50a022d841c8e75fd8b6188c026","last_reissued_at":"2026-05-18T00:39:34.594181Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:39:34.594181Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.10681","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":"2026-05-18T00:39:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PofR6DSCmRzDAqrac08anoLEVidMGc01Y4i2jfUSMiVQwwPp+l2pYzIxCrIWvUkvhUGwhB+Mu1XbrcTX7JZkAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:26:18.751716Z"},"content_sha256":"8a6aa376ca2caee37024bda9a467080ebe1f42330fc4bcced798f6250ef3a38d","schema_version":"1.0","event_id":"sha256:8a6aa376ca2caee37024bda9a467080ebe1f42330fc4bcced798f6250ef3a38d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:4CE7IRODZ3NOQ7Y6SI3QLMPKWP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Extragalactic Background Light: a measurement at 400 nm using dark cloud shadow I. Low surface brightness spectrophotometry in the area of Lynds 1642","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"(2) South African Astronomical Observatory, 3), (3) Southern African Large Telescope, (4) Astronomisches Institut, Cape Town, Ch. Leinert (5) ((1) Department of Physics, Finland, Germany), Germany (5) Max-Planck-Institut f\\\"ur Astronomie, G. von Appen-Schnur (4), Heidelberg, K. Lehtinen (1), K. Mattila (1), P. V\\\"ais\\\"anen (2, Ruhr-Universit\\\"at Bochum, South Africa, University of Helsinki","submitted_at":"2017-05-30T14:55:38Z","abstract_excerpt":"We present the method and observations for the measurement of the Extragalactic Background Light (EBL) utilizing the shadowing effect of a dark cloud. We measure the surface brightness difference between the opaque cloud core and its unobscured surroundings. In the difference the large atmospheric and Zodiacal light components are eliminated and the only remaining foreground component is the scattered starlight from the cloud itself. Although much smaller, its separation is the key problem in the method. For its separation we use spectroscopy. While the scattered starlight has the characterist"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.10681","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":"2026-05-18T00:39:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l79lbZeZ+1VCnB9gNIr/Pw4oNfVO1JNo4Ykji5Zu1cnlxNxz2xJxzqBVaMgv2vPavZo6C55QzlA+Fpu6jInRAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:26:18.752271Z"},"content_sha256":"9c7d8ef95dc949ac31b5f750f73860c32197e03547e60ac71b0f5192b365202c","schema_version":"1.0","event_id":"sha256:9c7d8ef95dc949ac31b5f750f73860c32197e03547e60ac71b0f5192b365202c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4CE7IRODZ3NOQ7Y6SI3QLMPKWP/bundle.json","state_url":"https://pith.science/pith/4CE7IRODZ3NOQ7Y6SI3QLMPKWP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4CE7IRODZ3NOQ7Y6SI3QLMPKWP/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":"2026-05-25T16:26:18Z","links":{"resolver":"https://pith.science/pith/4CE7IRODZ3NOQ7Y6SI3QLMPKWP","bundle":"https://pith.science/pith/4CE7IRODZ3NOQ7Y6SI3QLMPKWP/bundle.json","state":"https://pith.science/pith/4CE7IRODZ3NOQ7Y6SI3QLMPKWP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4CE7IRODZ3NOQ7Y6SI3QLMPKWP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:4CE7IRODZ3NOQ7Y6SI3QLMPKWP","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":"5e523c2904e193e587ae0a8093049e3121ac99c39294891c92def8f8e52eee9c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-05-30T14:55:38Z","title_canon_sha256":"29e08d6e0807026aa358e72eea78ee1444a16b9bcfe5536b96ec5a684e034ff6"},"schema_version":"1.0","source":{"id":"1705.10681","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.10681","created_at":"2026-05-18T00:39:34Z"},{"alias_kind":"arxiv_version","alias_value":"1705.10681v1","created_at":"2026-05-18T00:39:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.10681","created_at":"2026-05-18T00:39:34Z"},{"alias_kind":"pith_short_12","alias_value":"4CE7IRODZ3NO","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_16","alias_value":"4CE7IRODZ3NOQ7Y6","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_8","alias_value":"4CE7IROD","created_at":"2026-05-18T12:30:58Z"}],"graph_snapshots":[{"event_id":"sha256:9c7d8ef95dc949ac31b5f750f73860c32197e03547e60ac71b0f5192b365202c","target":"graph","created_at":"2026-05-18T00:39:34Z","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":"We present the method and observations for the measurement of the Extragalactic Background Light (EBL) utilizing the shadowing effect of a dark cloud. We measure the surface brightness difference between the opaque cloud core and its unobscured surroundings. In the difference the large atmospheric and Zodiacal light components are eliminated and the only remaining foreground component is the scattered starlight from the cloud itself. Although much smaller, its separation is the key problem in the method. For its separation we use spectroscopy. While the scattered starlight has the characterist","authors_text":"(2) South African Astronomical Observatory, 3), (3) Southern African Large Telescope, (4) Astronomisches Institut, Cape Town, Ch. Leinert (5) ((1) Department of Physics, Finland, Germany), Germany (5) Max-Planck-Institut f\\\"ur Astronomie, G. von Appen-Schnur (4), Heidelberg, K. Lehtinen (1), K. Mattila (1), P. V\\\"ais\\\"anen (2, Ruhr-Universit\\\"at Bochum, South Africa, University of Helsinki","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-05-30T14:55:38Z","title":"Extragalactic Background Light: a measurement at 400 nm using dark cloud shadow I. Low surface brightness spectrophotometry in the area of Lynds 1642"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.10681","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":"sha256:8a6aa376ca2caee37024bda9a467080ebe1f42330fc4bcced798f6250ef3a38d","target":"record","created_at":"2026-05-18T00:39:34Z","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":"5e523c2904e193e587ae0a8093049e3121ac99c39294891c92def8f8e52eee9c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-05-30T14:55:38Z","title_canon_sha256":"29e08d6e0807026aa358e72eea78ee1444a16b9bcfe5536b96ec5a684e034ff6"},"schema_version":"1.0","source":{"id":"1705.10681","kind":"arxiv","version":1}},"canonical_sha256":"e089f445c3cedae87f1e923705b1eab3e567b50a022d841c8e75fd8b6188c026","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e089f445c3cedae87f1e923705b1eab3e567b50a022d841c8e75fd8b6188c026","first_computed_at":"2026-05-18T00:39:34.594181Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:39:34.594181Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GAFCdrPsn/UacPJ8bBagBsFhf1CJcOJr/g1L4KowHtFfeA7FT8OUEGRTF9Nv0YOxx6XPehY6j+uErJBqrmfrAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:39:34.594904Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.10681","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8a6aa376ca2caee37024bda9a467080ebe1f42330fc4bcced798f6250ef3a38d","sha256:9c7d8ef95dc949ac31b5f750f73860c32197e03547e60ac71b0f5192b365202c"],"state_sha256":"94da37c7525a20232a356a6b2caa93702f60ebae312cacb0ca9d977d7f6fe58f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zQrtG2XNBcoXx4sN9HpiRUZXGZ8CWmfjbgeBoR5IjRy57GEgwBpggQBjPnKdcw7A3Hrfp/rPncWYBEb2n93+Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T16:26:18.757781Z","bundle_sha256":"9a33f62f8467eac98cdb732a4266e5db1cb80c2221530e72cab1c7b470be55fd"}}