{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:HXOAIJJW2IXLLK4KNW5SDW5ZK7","short_pith_number":"pith:HXOAIJJW","canonical_record":{"source":{"id":"1001.5422","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-01-29T16:02:50Z","cross_cats_sorted":[],"title_canon_sha256":"5fb47322199eb38eaf09f824effd720f1c55919e56945a627297a9d6d9e45164","abstract_canon_sha256":"6392f0e255ccbdf8a83e8989483d97a825249ea3ba5f58ac498ed5d7a4f2eadd"},"schema_version":"1.0"},"canonical_sha256":"3ddc042536d22eb5ab8a6dbb21dbb957c1b6682ed8ece86b5ca6c23fcbdbd100","source":{"kind":"arxiv","id":"1001.5422","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1001.5422","created_at":"2026-05-18T02:09:22Z"},{"alias_kind":"arxiv_version","alias_value":"1001.5422v1","created_at":"2026-05-18T02:09:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1001.5422","created_at":"2026-05-18T02:09:22Z"},{"alias_kind":"pith_short_12","alias_value":"HXOAIJJW2IXL","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"HXOAIJJW2IXLLK4K","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"HXOAIJJW","created_at":"2026-05-18T12:26:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:HXOAIJJW2IXLLK4KNW5SDW5ZK7","target":"record","payload":{"canonical_record":{"source":{"id":"1001.5422","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-01-29T16:02:50Z","cross_cats_sorted":[],"title_canon_sha256":"5fb47322199eb38eaf09f824effd720f1c55919e56945a627297a9d6d9e45164","abstract_canon_sha256":"6392f0e255ccbdf8a83e8989483d97a825249ea3ba5f58ac498ed5d7a4f2eadd"},"schema_version":"1.0"},"canonical_sha256":"3ddc042536d22eb5ab8a6dbb21dbb957c1b6682ed8ece86b5ca6c23fcbdbd100","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:09:22.147978Z","signature_b64":"LnW5MaLLILk6ZL5PZioH3aGJUqJh51CftuZmLPK4pHfk0BwxbLRe79irlbdKX5J0G8XSKJv4Wq0uikmSQnKjCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3ddc042536d22eb5ab8a6dbb21dbb957c1b6682ed8ece86b5ca6c23fcbdbd100","last_reissued_at":"2026-05-18T02:09:22.147193Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:09:22.147193Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1001.5422","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":"2026-05-18T02:09:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4793UkzNy6oi9lB0VLRY+NJjUfo+C1y9ZH7ZtJslSkOwIMSsmDc26uYrGuNteJkLkjpRg6aCwhShuT32f94qAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T18:18:41.754341Z"},"content_sha256":"1ffb1841efb58666a7aa858ac085c2f26b811f5375895f9b9989618a8d04a645","schema_version":"1.0","event_id":"sha256:1ffb1841efb58666a7aa858ac085c2f26b811f5375895f9b9989618a8d04a645"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:HXOAIJJW2IXLLK4KNW5SDW5ZK7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experiments with calibrated digital sideband separating downconversion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"J. Richard Fisher, Matthew A. Morgan","submitted_at":"2010-01-29T16:02:50Z","abstract_excerpt":"This article reports on the first step in a focused program to re-optimize radio astronomy receiver architecture to better take advantage of the latest advancements in commercial digital technology. Specifically, an L-Band sideband-separating downconverter has been built using a combination of careful (but ultimately very simple) analog design and digital signal processing to achieve wideband downconversion of an RFI-rich frequency spectrum to baseband in a single mixing step, with a fixed-frequency Local Oscillator and stable sideband isolation exceeding 50 dB over a 12 degree C temperature r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1001.5422","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":"2026-05-18T02:09:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q0UFtu/Dz6PvMjbCp+0kU1OVr1ukB2cvmrqnmdeDajXCdlvWAgwdkV3tF7F4mQSRX6Iix5kT4X+WgJsocbeXAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T18:18:41.754939Z"},"content_sha256":"5af4cb4b221c06d9e26f661fbe11f888d530ef9838d4fdcb1cbbde7a5b6c95ca","schema_version":"1.0","event_id":"sha256:5af4cb4b221c06d9e26f661fbe11f888d530ef9838d4fdcb1cbbde7a5b6c95ca"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HXOAIJJW2IXLLK4KNW5SDW5ZK7/bundle.json","state_url":"https://pith.science/pith/HXOAIJJW2IXLLK4KNW5SDW5ZK7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HXOAIJJW2IXLLK4KNW5SDW5ZK7/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":"2026-06-04T18:18:41Z","links":{"resolver":"https://pith.science/pith/HXOAIJJW2IXLLK4KNW5SDW5ZK7","bundle":"https://pith.science/pith/HXOAIJJW2IXLLK4KNW5SDW5ZK7/bundle.json","state":"https://pith.science/pith/HXOAIJJW2IXLLK4KNW5SDW5ZK7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HXOAIJJW2IXLLK4KNW5SDW5ZK7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:HXOAIJJW2IXLLK4KNW5SDW5ZK7","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":"6392f0e255ccbdf8a83e8989483d97a825249ea3ba5f58ac498ed5d7a4f2eadd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-01-29T16:02:50Z","title_canon_sha256":"5fb47322199eb38eaf09f824effd720f1c55919e56945a627297a9d6d9e45164"},"schema_version":"1.0","source":{"id":"1001.5422","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1001.5422","created_at":"2026-05-18T02:09:22Z"},{"alias_kind":"arxiv_version","alias_value":"1001.5422v1","created_at":"2026-05-18T02:09:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1001.5422","created_at":"2026-05-18T02:09:22Z"},{"alias_kind":"pith_short_12","alias_value":"HXOAIJJW2IXL","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"HXOAIJJW2IXLLK4K","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"HXOAIJJW","created_at":"2026-05-18T12:26:07Z"}],"graph_snapshots":[{"event_id":"sha256:5af4cb4b221c06d9e26f661fbe11f888d530ef9838d4fdcb1cbbde7a5b6c95ca","target":"graph","created_at":"2026-05-18T02:09:22Z","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 article reports on the first step in a focused program to re-optimize radio astronomy receiver architecture to better take advantage of the latest advancements in commercial digital technology. Specifically, an L-Band sideband-separating downconverter has been built using a combination of careful (but ultimately very simple) analog design and digital signal processing to achieve wideband downconversion of an RFI-rich frequency spectrum to baseband in a single mixing step, with a fixed-frequency Local Oscillator and stable sideband isolation exceeding 50 dB over a 12 degree C temperature r","authors_text":"J. Richard Fisher, Matthew A. Morgan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-01-29T16:02:50Z","title":"Experiments with calibrated digital sideband separating downconversion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1001.5422","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":"sha256:1ffb1841efb58666a7aa858ac085c2f26b811f5375895f9b9989618a8d04a645","target":"record","created_at":"2026-05-18T02:09:22Z","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":"6392f0e255ccbdf8a83e8989483d97a825249ea3ba5f58ac498ed5d7a4f2eadd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-01-29T16:02:50Z","title_canon_sha256":"5fb47322199eb38eaf09f824effd720f1c55919e56945a627297a9d6d9e45164"},"schema_version":"1.0","source":{"id":"1001.5422","kind":"arxiv","version":1}},"canonical_sha256":"3ddc042536d22eb5ab8a6dbb21dbb957c1b6682ed8ece86b5ca6c23fcbdbd100","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3ddc042536d22eb5ab8a6dbb21dbb957c1b6682ed8ece86b5ca6c23fcbdbd100","first_computed_at":"2026-05-18T02:09:22.147193Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:09:22.147193Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LnW5MaLLILk6ZL5PZioH3aGJUqJh51CftuZmLPK4pHfk0BwxbLRe79irlbdKX5J0G8XSKJv4Wq0uikmSQnKjCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:09:22.147978Z","signed_message":"canonical_sha256_bytes"},"source_id":"1001.5422","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1ffb1841efb58666a7aa858ac085c2f26b811f5375895f9b9989618a8d04a645","sha256:5af4cb4b221c06d9e26f661fbe11f888d530ef9838d4fdcb1cbbde7a5b6c95ca"],"state_sha256":"20c591f88e8ae7234739f91d18cc5b195130f56750256a363f2102c89842eebe"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1etFtcNfKp9K3HaKF01FtcTkCqHenfT5ITg3wtnkwbTV0tyTSl707VTdgAft188mrDqaHmBSBJ3HCFPASOjPDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T18:18:41.757911Z","bundle_sha256":"4ccac0b0ad3841dbd0c60fccbad91fb823f73e267a410778b0004d41f6ee128b"}}