{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:IATZI7AMSW7ZU5TXP4MZFM4MHU","short_pith_number":"pith:IATZI7AM","canonical_record":{"source":{"id":"1509.08836","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-29T16:37:06Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"8942636b5f6057158112f079499cb0e092bc95ccd8dce53e7747027d66fd9867","abstract_canon_sha256":"c76e3b00d8877f71b112bff72db67ed760f4b15023b1769ead0c2ef29437ad99"},"schema_version":"1.0"},"canonical_sha256":"4027947c0c95bf9a76777f1992b38c3d244146ec2561dbf0e9baa125c2ad3839","source":{"kind":"arxiv","id":"1509.08836","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.08836","created_at":"2026-05-18T01:31:46Z"},{"alias_kind":"arxiv_version","alias_value":"1509.08836v1","created_at":"2026-05-18T01:31:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.08836","created_at":"2026-05-18T01:31:46Z"},{"alias_kind":"pith_short_12","alias_value":"IATZI7AMSW7Z","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"IATZI7AMSW7ZU5TX","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"IATZI7AM","created_at":"2026-05-18T12:29:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:IATZI7AMSW7ZU5TXP4MZFM4MHU","target":"record","payload":{"canonical_record":{"source":{"id":"1509.08836","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-29T16:37:06Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"8942636b5f6057158112f079499cb0e092bc95ccd8dce53e7747027d66fd9867","abstract_canon_sha256":"c76e3b00d8877f71b112bff72db67ed760f4b15023b1769ead0c2ef29437ad99"},"schema_version":"1.0"},"canonical_sha256":"4027947c0c95bf9a76777f1992b38c3d244146ec2561dbf0e9baa125c2ad3839","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:31:46.985532Z","signature_b64":"K3HGeg/LFjMTj+CAut+sTH+cCKpSqCYraSh32Iw/y13tfad1AXKjZ5tDtWbd18cMFjxSfC1LDMhGMsYc2ojIDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4027947c0c95bf9a76777f1992b38c3d244146ec2561dbf0e9baa125c2ad3839","last_reissued_at":"2026-05-18T01:31:46.984808Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:31:46.984808Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.08836","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":"2026-05-18T01:31:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O129612foNzJByUHY8elpqOoSKm9b7uoV8u8zZ7TGDzKL55RQanNQuPomNXzgM6hL+hzgDAGGsFHmkqkrv3uAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T12:36:04.221037Z"},"content_sha256":"a7c76583e7c58e404d9a951892dba092b66baa10b9e9e3634044ef12107435ce","schema_version":"1.0","event_id":"sha256:a7c76583e7c58e404d9a951892dba092b66baa10b9e9e3634044ef12107435ce"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:IATZI7AMSW7ZU5TXP4MZFM4MHU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experimental Demonstration of Capacity Increase and Rate-Adaptation by Probabilistically Shaped 64-QAM","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Fabian Steiner, Fred Buchali, Georg B\\\"ocherer, Laurent Schmalen, Patrick Schulte, Wilfried Idler","submitted_at":"2015-09-29T16:37:06Z","abstract_excerpt":"We implemented a flexible transmission system operating at adjustable data rate and fixed bandwidth, baudrate, constellation and overhead using probabilistic shaping. We demonstrated in a transmission experiment up to 15% capacity and 43% reach increase versus 200 Gbit/s 16-QAM."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.08836","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":"2026-05-18T01:31:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I0jjBzRzKqmp5z7fFCdvN/r7cJlWPSsnuHQtzlAByoIDpz5jnhTKr5psoFAj3UkK41trTDIwSB+csXBN5Tw1Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T12:36:04.221402Z"},"content_sha256":"732d6ee92d4b5473f6171dcee93c60c9494fbdb8b498c9c3f5f97801ad06c995","schema_version":"1.0","event_id":"sha256:732d6ee92d4b5473f6171dcee93c60c9494fbdb8b498c9c3f5f97801ad06c995"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IATZI7AMSW7ZU5TXP4MZFM4MHU/bundle.json","state_url":"https://pith.science/pith/IATZI7AMSW7ZU5TXP4MZFM4MHU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IATZI7AMSW7ZU5TXP4MZFM4MHU/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":"2026-06-04T12:36:04Z","links":{"resolver":"https://pith.science/pith/IATZI7AMSW7ZU5TXP4MZFM4MHU","bundle":"https://pith.science/pith/IATZI7AMSW7ZU5TXP4MZFM4MHU/bundle.json","state":"https://pith.science/pith/IATZI7AMSW7ZU5TXP4MZFM4MHU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IATZI7AMSW7ZU5TXP4MZFM4MHU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:IATZI7AMSW7ZU5TXP4MZFM4MHU","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":"c76e3b00d8877f71b112bff72db67ed760f4b15023b1769ead0c2ef29437ad99","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-29T16:37:06Z","title_canon_sha256":"8942636b5f6057158112f079499cb0e092bc95ccd8dce53e7747027d66fd9867"},"schema_version":"1.0","source":{"id":"1509.08836","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.08836","created_at":"2026-05-18T01:31:46Z"},{"alias_kind":"arxiv_version","alias_value":"1509.08836v1","created_at":"2026-05-18T01:31:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.08836","created_at":"2026-05-18T01:31:46Z"},{"alias_kind":"pith_short_12","alias_value":"IATZI7AMSW7Z","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"IATZI7AMSW7ZU5TX","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"IATZI7AM","created_at":"2026-05-18T12:29:25Z"}],"graph_snapshots":[{"event_id":"sha256:732d6ee92d4b5473f6171dcee93c60c9494fbdb8b498c9c3f5f97801ad06c995","target":"graph","created_at":"2026-05-18T01:31:46Z","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 implemented a flexible transmission system operating at adjustable data rate and fixed bandwidth, baudrate, constellation and overhead using probabilistic shaping. We demonstrated in a transmission experiment up to 15% capacity and 43% reach increase versus 200 Gbit/s 16-QAM.","authors_text":"Fabian Steiner, Fred Buchali, Georg B\\\"ocherer, Laurent Schmalen, Patrick Schulte, Wilfried Idler","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-29T16:37:06Z","title":"Experimental Demonstration of Capacity Increase and Rate-Adaptation by Probabilistically Shaped 64-QAM"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.08836","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:a7c76583e7c58e404d9a951892dba092b66baa10b9e9e3634044ef12107435ce","target":"record","created_at":"2026-05-18T01:31:46Z","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":"c76e3b00d8877f71b112bff72db67ed760f4b15023b1769ead0c2ef29437ad99","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-09-29T16:37:06Z","title_canon_sha256":"8942636b5f6057158112f079499cb0e092bc95ccd8dce53e7747027d66fd9867"},"schema_version":"1.0","source":{"id":"1509.08836","kind":"arxiv","version":1}},"canonical_sha256":"4027947c0c95bf9a76777f1992b38c3d244146ec2561dbf0e9baa125c2ad3839","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4027947c0c95bf9a76777f1992b38c3d244146ec2561dbf0e9baa125c2ad3839","first_computed_at":"2026-05-18T01:31:46.984808Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:31:46.984808Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K3HGeg/LFjMTj+CAut+sTH+cCKpSqCYraSh32Iw/y13tfad1AXKjZ5tDtWbd18cMFjxSfC1LDMhGMsYc2ojIDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:31:46.985532Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.08836","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a7c76583e7c58e404d9a951892dba092b66baa10b9e9e3634044ef12107435ce","sha256:732d6ee92d4b5473f6171dcee93c60c9494fbdb8b498c9c3f5f97801ad06c995"],"state_sha256":"44178f4f90775d2ae07d7ba3ea8eb4c380b7b9a6e0d370b6fa83fa77373f3c31"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e3wgyj5rvpcirlvE13Eim4w3hcFAZlczVJVfhXczRkm/Ffe2AJNh+CtywnpyEy2xw2VcSQefrJ0zr1B2SYm5DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T12:36:04.223321Z","bundle_sha256":"3491224e24d6d78acf057fc32fbb3157ee763370027c3b70be79548c77e20ffd"}}