{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:64HZI37XBIFLSROTG7TXKZIDDB","short_pith_number":"pith:64HZI37X","canonical_record":{"source":{"id":"2508.01438","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2025-08-02T16:57:53Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"c87654bbf2aa87038fcab9235f4df787198b3d15f273d4f65e166289046a88ff","abstract_canon_sha256":"27330f0919a46e69d764aa4303d978109910a9927e586df38361c2ff0ded40f9"},"schema_version":"1.0"},"canonical_sha256":"f70f946ff70a0ab945d337e775650318477089fba2ac48e826be50fc54e54578","source":{"kind":"arxiv","id":"2508.01438","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.01438","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"arxiv_version","alias_value":"2508.01438v3","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.01438","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"pith_short_12","alias_value":"64HZI37XBIFL","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"pith_short_16","alias_value":"64HZI37XBIFLSROT","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"pith_short_8","alias_value":"64HZI37X","created_at":"2026-07-21T02:21:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:64HZI37XBIFLSROTG7TXKZIDDB","target":"record","payload":{"canonical_record":{"source":{"id":"2508.01438","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2025-08-02T16:57:53Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"c87654bbf2aa87038fcab9235f4df787198b3d15f273d4f65e166289046a88ff","abstract_canon_sha256":"27330f0919a46e69d764aa4303d978109910a9927e586df38361c2ff0ded40f9"},"schema_version":"1.0"},"canonical_sha256":"f70f946ff70a0ab945d337e775650318477089fba2ac48e826be50fc54e54578","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-21T02:21:20.405753Z","signature_b64":"22jBcWn/fWznbr2/WKSIyQChbRiJ/dgTlS13S7tqyBx8PVe1u1/QVUltj5LUgXH/yA0IFWFExHSBJ5AyJPGvCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f70f946ff70a0ab945d337e775650318477089fba2ac48e826be50fc54e54578","last_reissued_at":"2026-07-21T02:21:20.404911Z","signature_status":"signed_v1","first_computed_at":"2026-07-21T02:21:20.404911Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2508.01438","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-21T02:21:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"utwf9tlq0uQPSpxaNPDKIQazxbVIE4Dn0mytbvwlqjS2+xuEf5zcM49hMvk5XemIhRR/G6Jy7QLvEQrheVTOAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T07:14:16.189601Z"},"content_sha256":"200848a1310ff6c3163a65b4b83c4778ceff0c36f22e78ac3b851d00791c398e","schema_version":"1.0","event_id":"sha256:200848a1310ff6c3163a65b4b83c4778ceff0c36f22e78ac3b851d00791c398e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:64HZI37XBIFLSROTG7TXKZIDDB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Information Rates of Approximate Message Passing for Bandlimited Direct-Detection Channels","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Amine Mezghani, Daniel Plabst, Gerhard Kramer, Mohamed Akrout, Tobias Prinz","submitted_at":"2025-08-02T16:57:53Z","abstract_excerpt":"The capacity of bandlimited direct-detection channels is challenging to compute or approach due to the receiver non-linearity. A generalized vector approximate message passing (GVAMP) detector is designed to achieve high rates at a reasonable level of complexity. The rates increase by using multi-level coding and successive interference cancellation. The methods are applied to fiber-optic channels with intersymbol interference caused by spectrally efficient pulse shapes, chromatic dispersion, and receiver sampling at twice the baud rate. Bipolar modulation operates within 0.26 bits per channel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.01438","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2508.01438/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-21T02:21:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J+2oewVKkT5n2uuQW0DMisv1oy8aykfZOsruYbIQJ2yOEOtjPFwSbG+LlTfpLl4wdkuROIpnUm6Xhmeo4RKXAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T07:14:16.190085Z"},"content_sha256":"cc9365a731ce6b08eae871d1c17cf555f918cf79afdffeb9b6827e93acd5c167","schema_version":"1.0","event_id":"sha256:cc9365a731ce6b08eae871d1c17cf555f918cf79afdffeb9b6827e93acd5c167"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/64HZI37XBIFLSROTG7TXKZIDDB/bundle.json","state_url":"https://pith.science/pith/64HZI37XBIFLSROTG7TXKZIDDB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/64HZI37XBIFLSROTG7TXKZIDDB/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":"2026-08-05T07:14:16Z","links":{"resolver":"https://pith.science/pith/64HZI37XBIFLSROTG7TXKZIDDB","bundle":"https://pith.science/pith/64HZI37XBIFLSROTG7TXKZIDDB/bundle.json","state":"https://pith.science/pith/64HZI37XBIFLSROTG7TXKZIDDB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/64HZI37XBIFLSROTG7TXKZIDDB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:64HZI37XBIFLSROTG7TXKZIDDB","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":"27330f0919a46e69d764aa4303d978109910a9927e586df38361c2ff0ded40f9","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2025-08-02T16:57:53Z","title_canon_sha256":"c87654bbf2aa87038fcab9235f4df787198b3d15f273d4f65e166289046a88ff"},"schema_version":"1.0","source":{"id":"2508.01438","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.01438","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"arxiv_version","alias_value":"2508.01438v3","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.01438","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"pith_short_12","alias_value":"64HZI37XBIFL","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"pith_short_16","alias_value":"64HZI37XBIFLSROT","created_at":"2026-07-21T02:21:20Z"},{"alias_kind":"pith_short_8","alias_value":"64HZI37X","created_at":"2026-07-21T02:21:20Z"}],"graph_snapshots":[{"event_id":"sha256:cc9365a731ce6b08eae871d1c17cf555f918cf79afdffeb9b6827e93acd5c167","target":"graph","created_at":"2026-07-21T02:21:20Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2508.01438/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The capacity of bandlimited direct-detection channels is challenging to compute or approach due to the receiver non-linearity. A generalized vector approximate message passing (GVAMP) detector is designed to achieve high rates at a reasonable level of complexity. The rates increase by using multi-level coding and successive interference cancellation. The methods are applied to fiber-optic channels with intersymbol interference caused by spectrally efficient pulse shapes, chromatic dispersion, and receiver sampling at twice the baud rate. Bipolar modulation operates within 0.26 bits per channel","authors_text":"Amine Mezghani, Daniel Plabst, Gerhard Kramer, Mohamed Akrout, Tobias Prinz","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2025-08-02T16:57:53Z","title":"Information Rates of Approximate Message Passing for Bandlimited Direct-Detection Channels"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.01438","kind":"arxiv","version":3},"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":"sha256:200848a1310ff6c3163a65b4b83c4778ceff0c36f22e78ac3b851d00791c398e","target":"record","created_at":"2026-07-21T02:21:20Z","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":"27330f0919a46e69d764aa4303d978109910a9927e586df38361c2ff0ded40f9","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2025-08-02T16:57:53Z","title_canon_sha256":"c87654bbf2aa87038fcab9235f4df787198b3d15f273d4f65e166289046a88ff"},"schema_version":"1.0","source":{"id":"2508.01438","kind":"arxiv","version":3}},"canonical_sha256":"f70f946ff70a0ab945d337e775650318477089fba2ac48e826be50fc54e54578","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f70f946ff70a0ab945d337e775650318477089fba2ac48e826be50fc54e54578","first_computed_at":"2026-07-21T02:21:20.404911Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-21T02:21:20.404911Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"22jBcWn/fWznbr2/WKSIyQChbRiJ/dgTlS13S7tqyBx8PVe1u1/QVUltj5LUgXH/yA0IFWFExHSBJ5AyJPGvCQ==","signature_status":"signed_v1","signed_at":"2026-07-21T02:21:20.405753Z","signed_message":"canonical_sha256_bytes"},"source_id":"2508.01438","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:200848a1310ff6c3163a65b4b83c4778ceff0c36f22e78ac3b851d00791c398e","sha256:cc9365a731ce6b08eae871d1c17cf555f918cf79afdffeb9b6827e93acd5c167"],"state_sha256":"39a4e966d054b84dbb6b41d420435db4c2f4d7c018947cbf5f2a8a4bcaa7d917"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nvopUWm13OVmeNn08Q1/vrN0WexayUAW7cQoUCE9w0vIdfbS1G3uofiXhS/pLM6Umiy1F11kZPuQ7vTczdu+CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T07:14:16.193220Z","bundle_sha256":"254a8a90ad919e5025d76c40a6ad2f5ecd1eb5b156b1c9ad7d5f9fd8c72f0b79"}}