{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:I3N6WIHF6RTJWQ7LOIOHPIRFYX","short_pith_number":"pith:I3N6WIHF","canonical_record":{"source":{"id":"1502.05506","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-02-19T09:17:23Z","cross_cats_sorted":[],"title_canon_sha256":"d3078d506f96a63fcfb3e2c995a7d1193cf7d346118cfa6fcdcf628d67f9dcb1","abstract_canon_sha256":"f0398fef645fc51b34b696d667aa884dcbcfb4b980096002da78948c6015fe8a"},"schema_version":"1.0"},"canonical_sha256":"46dbeb20e5f4669b43eb721c77a225c5d611d4f8a3530f1fa04c5beb98f5508a","source":{"kind":"arxiv","id":"1502.05506","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05506","created_at":"2026-05-18T01:25:01Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05506v1","created_at":"2026-05-18T01:25:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05506","created_at":"2026-05-18T01:25:01Z"},{"alias_kind":"pith_short_12","alias_value":"I3N6WIHF6RTJ","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"I3N6WIHF6RTJWQ7L","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"I3N6WIHF","created_at":"2026-05-18T12:29:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:I3N6WIHF6RTJWQ7LOIOHPIRFYX","target":"record","payload":{"canonical_record":{"source":{"id":"1502.05506","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-02-19T09:17:23Z","cross_cats_sorted":[],"title_canon_sha256":"d3078d506f96a63fcfb3e2c995a7d1193cf7d346118cfa6fcdcf628d67f9dcb1","abstract_canon_sha256":"f0398fef645fc51b34b696d667aa884dcbcfb4b980096002da78948c6015fe8a"},"schema_version":"1.0"},"canonical_sha256":"46dbeb20e5f4669b43eb721c77a225c5d611d4f8a3530f1fa04c5beb98f5508a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:25:01.795388Z","signature_b64":"KLXsu9PGVuoTtHqhu1yGVqc54kMUxb9NqU0sl7R9f5W5YDq+1pYlnua57y2DBuniuam5qBF3QvBCq7lO2yp9Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"46dbeb20e5f4669b43eb721c77a225c5d611d4f8a3530f1fa04c5beb98f5508a","last_reissued_at":"2026-05-18T01:25:01.794656Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:25:01.794656Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.05506","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":"2026-05-18T01:25:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mJM/7TVZjNvBIIJqjqR7k8bWenibbOAMXWW09TAHWfk26V9roioviZqtHqTGECy7TjgewNoLuCxwEUm3TSDSCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:32:43.159630Z"},"content_sha256":"3c426545baae2aa9d682304ecb7fa915e1025f99790f66a9c529ddeec2255a57","schema_version":"1.0","event_id":"sha256:3c426545baae2aa9d682304ecb7fa915e1025f99790f66a9c529ddeec2255a57"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:I3N6WIHF6RTJWQ7LOIOHPIRFYX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A versatile digital camera trigger for telescopes in the Cherenkov Telescope Array","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"K.-H. Sulanke, M. Shayduk, R. Wischnewski, S. Vorobiov, U. Schwanke","submitted_at":"2015-02-19T09:17:23Z","abstract_excerpt":"This paper describes the concept of an FPGA-based digital camera trigger for imaging atmospheric Cherenkov telescopes, developed for the future Cherenkov Telescope Array (CTA). The proposed camera trigger is designed to select images initiated by the Cherenkov emission of extended air showers from very-high energy (VHE, E>20 GeV) photons and charged particles while suppressing signatures from background light. The trigger comprises three stages. A first stage employs programmable discriminators to digitize the signals arriving from the camera channels (pixels). At the second stage, a grid of l"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05506","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":"2026-05-18T01:25:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ejNnwerl++EpuwtGc7vsP2l2HfjXYaBl7tEf12iyzRiqbzybB5UAIlBirwr6vHqMymEGpD4+KuVON/3EpNl9Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:32:43.160255Z"},"content_sha256":"939dcb9619f608f71e0b56fa8c68be402a97b7da02ad0335d0fa1a4070999c1e","schema_version":"1.0","event_id":"sha256:939dcb9619f608f71e0b56fa8c68be402a97b7da02ad0335d0fa1a4070999c1e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I3N6WIHF6RTJWQ7LOIOHPIRFYX/bundle.json","state_url":"https://pith.science/pith/I3N6WIHF6RTJWQ7LOIOHPIRFYX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I3N6WIHF6RTJWQ7LOIOHPIRFYX/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":"2026-05-26T16:32:43Z","links":{"resolver":"https://pith.science/pith/I3N6WIHF6RTJWQ7LOIOHPIRFYX","bundle":"https://pith.science/pith/I3N6WIHF6RTJWQ7LOIOHPIRFYX/bundle.json","state":"https://pith.science/pith/I3N6WIHF6RTJWQ7LOIOHPIRFYX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I3N6WIHF6RTJWQ7LOIOHPIRFYX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:I3N6WIHF6RTJWQ7LOIOHPIRFYX","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":"f0398fef645fc51b34b696d667aa884dcbcfb4b980096002da78948c6015fe8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-02-19T09:17:23Z","title_canon_sha256":"d3078d506f96a63fcfb3e2c995a7d1193cf7d346118cfa6fcdcf628d67f9dcb1"},"schema_version":"1.0","source":{"id":"1502.05506","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05506","created_at":"2026-05-18T01:25:01Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05506v1","created_at":"2026-05-18T01:25:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05506","created_at":"2026-05-18T01:25:01Z"},{"alias_kind":"pith_short_12","alias_value":"I3N6WIHF6RTJ","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"I3N6WIHF6RTJWQ7L","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"I3N6WIHF","created_at":"2026-05-18T12:29:25Z"}],"graph_snapshots":[{"event_id":"sha256:939dcb9619f608f71e0b56fa8c68be402a97b7da02ad0335d0fa1a4070999c1e","target":"graph","created_at":"2026-05-18T01:25:01Z","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":"This paper describes the concept of an FPGA-based digital camera trigger for imaging atmospheric Cherenkov telescopes, developed for the future Cherenkov Telescope Array (CTA). The proposed camera trigger is designed to select images initiated by the Cherenkov emission of extended air showers from very-high energy (VHE, E>20 GeV) photons and charged particles while suppressing signatures from background light. The trigger comprises three stages. A first stage employs programmable discriminators to digitize the signals arriving from the camera channels (pixels). At the second stage, a grid of l","authors_text":"K.-H. Sulanke, M. Shayduk, R. Wischnewski, S. Vorobiov, U. Schwanke","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-02-19T09:17:23Z","title":"A versatile digital camera trigger for telescopes in the Cherenkov Telescope Array"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05506","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":"sha256:3c426545baae2aa9d682304ecb7fa915e1025f99790f66a9c529ddeec2255a57","target":"record","created_at":"2026-05-18T01:25:01Z","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":"f0398fef645fc51b34b696d667aa884dcbcfb4b980096002da78948c6015fe8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-02-19T09:17:23Z","title_canon_sha256":"d3078d506f96a63fcfb3e2c995a7d1193cf7d346118cfa6fcdcf628d67f9dcb1"},"schema_version":"1.0","source":{"id":"1502.05506","kind":"arxiv","version":1}},"canonical_sha256":"46dbeb20e5f4669b43eb721c77a225c5d611d4f8a3530f1fa04c5beb98f5508a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"46dbeb20e5f4669b43eb721c77a225c5d611d4f8a3530f1fa04c5beb98f5508a","first_computed_at":"2026-05-18T01:25:01.794656Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:25:01.794656Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KLXsu9PGVuoTtHqhu1yGVqc54kMUxb9NqU0sl7R9f5W5YDq+1pYlnua57y2DBuniuam5qBF3QvBCq7lO2yp9Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:25:01.795388Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.05506","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3c426545baae2aa9d682304ecb7fa915e1025f99790f66a9c529ddeec2255a57","sha256:939dcb9619f608f71e0b56fa8c68be402a97b7da02ad0335d0fa1a4070999c1e"],"state_sha256":"ff8240f5fb68dfebe1e851e5cab14a9e8ae9e271645cb8bcefaab32171fea62f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OErqu9w1bU/Ds8kD3sRRtoeyaqTZYEyGSVsHnmeGAEfjgDER8pmpvRQvnznBvYSKFdVWR5SUfl0NYCGOrXQKDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T16:32:43.163242Z","bundle_sha256":"8c31e1e993bc2286aa1217ee65cb36651af80d93399a66bcfa482ba1feb200ef"}}