{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:6MG7JLEGABKY6UMA4WPBZW2TTJ","short_pith_number":"pith:6MG7JLEG","canonical_record":{"source":{"id":"1509.08611","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-09-29T07:05:41Z","cross_cats_sorted":[],"title_canon_sha256":"961ac56961c0b13b5389f82ca8f2a38c9dad111f55d1d508eed4831027590382","abstract_canon_sha256":"536d3ed4d607a70e474f5ed4f4ca2a646b32b766b1f84ecf9fb868d8a73dacb9"},"schema_version":"1.0"},"canonical_sha256":"f30df4ac8600558f5180e59e1cdb539a631747e2afc64525a7133ba30db52f98","source":{"kind":"arxiv","id":"1509.08611","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.08611","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"arxiv_version","alias_value":"1509.08611v2","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.08611","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"pith_short_12","alias_value":"6MG7JLEGABKY","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"6MG7JLEGABKY6UMA","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"6MG7JLEG","created_at":"2026-05-18T12:29:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:6MG7JLEGABKY6UMA4WPBZW2TTJ","target":"record","payload":{"canonical_record":{"source":{"id":"1509.08611","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-09-29T07:05:41Z","cross_cats_sorted":[],"title_canon_sha256":"961ac56961c0b13b5389f82ca8f2a38c9dad111f55d1d508eed4831027590382","abstract_canon_sha256":"536d3ed4d607a70e474f5ed4f4ca2a646b32b766b1f84ecf9fb868d8a73dacb9"},"schema_version":"1.0"},"canonical_sha256":"f30df4ac8600558f5180e59e1cdb539a631747e2afc64525a7133ba30db52f98","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:55.225070Z","signature_b64":"j38vgTBJ+d2XuaxAHMdAMcDU5jKqqaYiIqe+rUPdmuJKhq2oqgzkNtdslJmvx5NQGnkKa0YTGaA1rlQ5kJ80BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f30df4ac8600558f5180e59e1cdb539a631747e2afc64525a7133ba30db52f98","last_reissued_at":"2026-05-18T01:23:55.224346Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:55.224346Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.08611","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":"2026-05-18T01:23:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JPyvu+mecn5ShQChuEcCIKhQK7YR2OIwRl3GBSQkVRCGcazc9zWj6HRS/u/P/uF3daB3LIJrY5QyDtPABRgYCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T15:02:59.658753Z"},"content_sha256":"ddc58572bfa6bc306cbc522f811d8e68ca4f54e53e75f766fe50c4532cd377af","schema_version":"1.0","event_id":"sha256:ddc58572bfa6bc306cbc522f811d8e68ca4f54e53e75f766fe50c4532cd377af"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:6MG7JLEGABKY6UMA4WPBZW2TTJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Low-Noise CMOS Pixel Direct Charge Sensor, Topmetal-II-","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"Chaosong Gao, Chufeng Chen, Kai Wang, Le Xiao, Mangmang An, Mikyung Han, Ping Yang, Quan Sun, Rong Ji, Wei Zhou, Xiangming Sun, Xiaoting Li, Yuan Mei","submitted_at":"2015-09-29T07:05:41Z","abstract_excerpt":"We report the design and characterization of a CMOS pixel direct charge sensor, Topmetal-II-, fabricated in a standard 0.35um CMOS Integrated Circuit process. The sensor utilizes exposed metal patches on top of each pixel to directly collect charge. Each pixel contains a low-noise charge-sensitive preamplifier to establish the analog signal and a discriminator with tunable threshold to generate hits. The analog signal from each pixel is accessible through time-shared multiplexing over the entire array. Hits are read out digitally through a column-based priority logic structure. Tests show that"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.08611","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":"2026-05-18T01:23:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EWl7s2Q6271TegP6GoyvQi5+zP8RWCTtv0vT4h5dbd4Zvq1vqJBhQhedsLQuJiULzdAztAphyirL7hPuWU5YAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T15:02:59.659434Z"},"content_sha256":"cc835290afd37363011d692ff70aef040f51c64c82d86c29227b1c6f9680ff26","schema_version":"1.0","event_id":"sha256:cc835290afd37363011d692ff70aef040f51c64c82d86c29227b1c6f9680ff26"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6MG7JLEGABKY6UMA4WPBZW2TTJ/bundle.json","state_url":"https://pith.science/pith/6MG7JLEGABKY6UMA4WPBZW2TTJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6MG7JLEGABKY6UMA4WPBZW2TTJ/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":"2026-05-27T15:02:59Z","links":{"resolver":"https://pith.science/pith/6MG7JLEGABKY6UMA4WPBZW2TTJ","bundle":"https://pith.science/pith/6MG7JLEGABKY6UMA4WPBZW2TTJ/bundle.json","state":"https://pith.science/pith/6MG7JLEGABKY6UMA4WPBZW2TTJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6MG7JLEGABKY6UMA4WPBZW2TTJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:6MG7JLEGABKY6UMA4WPBZW2TTJ","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":"536d3ed4d607a70e474f5ed4f4ca2a646b32b766b1f84ecf9fb868d8a73dacb9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-09-29T07:05:41Z","title_canon_sha256":"961ac56961c0b13b5389f82ca8f2a38c9dad111f55d1d508eed4831027590382"},"schema_version":"1.0","source":{"id":"1509.08611","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.08611","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"arxiv_version","alias_value":"1509.08611v2","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.08611","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"pith_short_12","alias_value":"6MG7JLEGABKY","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"6MG7JLEGABKY6UMA","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"6MG7JLEG","created_at":"2026-05-18T12:29:07Z"}],"graph_snapshots":[{"event_id":"sha256:cc835290afd37363011d692ff70aef040f51c64c82d86c29227b1c6f9680ff26","target":"graph","created_at":"2026-05-18T01:23:55Z","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 report the design and characterization of a CMOS pixel direct charge sensor, Topmetal-II-, fabricated in a standard 0.35um CMOS Integrated Circuit process. The sensor utilizes exposed metal patches on top of each pixel to directly collect charge. Each pixel contains a low-noise charge-sensitive preamplifier to establish the analog signal and a discriminator with tunable threshold to generate hits. The analog signal from each pixel is accessible through time-shared multiplexing over the entire array. Hits are read out digitally through a column-based priority logic structure. Tests show that","authors_text":"Chaosong Gao, Chufeng Chen, Kai Wang, Le Xiao, Mangmang An, Mikyung Han, Ping Yang, Quan Sun, Rong Ji, Wei Zhou, Xiangming Sun, Xiaoting Li, Yuan Mei","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-09-29T07:05:41Z","title":"A Low-Noise CMOS Pixel Direct Charge Sensor, Topmetal-II-"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.08611","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:ddc58572bfa6bc306cbc522f811d8e68ca4f54e53e75f766fe50c4532cd377af","target":"record","created_at":"2026-05-18T01:23:55Z","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":"536d3ed4d607a70e474f5ed4f4ca2a646b32b766b1f84ecf9fb868d8a73dacb9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-09-29T07:05:41Z","title_canon_sha256":"961ac56961c0b13b5389f82ca8f2a38c9dad111f55d1d508eed4831027590382"},"schema_version":"1.0","source":{"id":"1509.08611","kind":"arxiv","version":2}},"canonical_sha256":"f30df4ac8600558f5180e59e1cdb539a631747e2afc64525a7133ba30db52f98","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f30df4ac8600558f5180e59e1cdb539a631747e2afc64525a7133ba30db52f98","first_computed_at":"2026-05-18T01:23:55.224346Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:23:55.224346Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"j38vgTBJ+d2XuaxAHMdAMcDU5jKqqaYiIqe+rUPdmuJKhq2oqgzkNtdslJmvx5NQGnkKa0YTGaA1rlQ5kJ80BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:23:55.225070Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.08611","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ddc58572bfa6bc306cbc522f811d8e68ca4f54e53e75f766fe50c4532cd377af","sha256:cc835290afd37363011d692ff70aef040f51c64c82d86c29227b1c6f9680ff26"],"state_sha256":"8f53053db459fe72f0486e0ce279cdf950ad2cc5a0f8a862b4af0d4a1f5322f0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UN6i2I7i0V7pbXVXssFIcEc/TKPoJiSXcbLYuuus0pCQW416trJ07R+RN3CJjwx4dQWUXV0n8AR/wW1Lc41rBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T15:02:59.662684Z","bundle_sha256":"4f3c92d40f1ca3bb47161daf2aeb38a6c294486f911ec8ec66c38fd7b6ff7019"}}