{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:VABPA6YPMUMSOLZD4WRKOVDCWD","short_pith_number":"pith:VABPA6YP","canonical_record":{"source":{"id":"2105.14237","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-05-29T07:12:01Z","cross_cats_sorted":[],"title_canon_sha256":"457baff0e983ef00ffb2b4917d20752669fadb6adb0b68cbc43ff0b472d32952","abstract_canon_sha256":"d63aa67b62c9e6cdcc580a3c7e877e3445218862363d7ae98e1ed5a0f63991a7"},"schema_version":"1.0"},"canonical_sha256":"a802f07b0f6519272f23e5a2a75462b0df2928cbaa87804b2c1d746bf169c861","source":{"kind":"arxiv","id":"2105.14237","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.14237","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"arxiv_version","alias_value":"2105.14237v1","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.14237","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"pith_short_12","alias_value":"VABPA6YPMUMS","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"pith_short_16","alias_value":"VABPA6YPMUMSOLZD","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"pith_short_8","alias_value":"VABPA6YP","created_at":"2026-07-05T03:12:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:VABPA6YPMUMSOLZD4WRKOVDCWD","target":"record","payload":{"canonical_record":{"source":{"id":"2105.14237","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-05-29T07:12:01Z","cross_cats_sorted":[],"title_canon_sha256":"457baff0e983ef00ffb2b4917d20752669fadb6adb0b68cbc43ff0b472d32952","abstract_canon_sha256":"d63aa67b62c9e6cdcc580a3c7e877e3445218862363d7ae98e1ed5a0f63991a7"},"schema_version":"1.0"},"canonical_sha256":"a802f07b0f6519272f23e5a2a75462b0df2928cbaa87804b2c1d746bf169c861","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:12:06.102826Z","signature_b64":"LEBbS9woxWFIurbEXlKA7auhtjR7LqJoAhUTQq7Zg0J0M2UM8ujCaAIy1GaXTQ8dHa9sO4G1Sl0H2pkFPEXeCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a802f07b0f6519272f23e5a2a75462b0df2928cbaa87804b2c1d746bf169c861","last_reissued_at":"2026-07-05T03:12:06.102365Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:12:06.102365Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.14237","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":"2026-07-05T03:12:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qCeDPQaL3WYqJLhJIJyuaOJAwwbgs9EOxr+ANLHzborXDxUgCOTKzSu92EviT4z3iCgQQSuGYPRAcHYIR5PkBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T17:00:43.590414Z"},"content_sha256":"c7c3a2a50c25b84c319a24fc98f52cfd3aaf5c86a5cc8d67419e2938075e3a6e","schema_version":"1.0","event_id":"sha256:c7c3a2a50c25b84c319a24fc98f52cfd3aaf5c86a5cc8d67419e2938075e3a6e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:VABPA6YPMUMSOLZD4WRKOVDCWD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Material survey for millimeter-wave absorber using 3-D printed mold","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"M. Hattori, O. Tajima, S. Adachi, T. Otsuka, Y. Sakurai","submitted_at":"2021-05-29T07:12:01Z","abstract_excerpt":"Radio absorptive materials (RAMs) are key elements for receivers in the millimeter-wave range. For astronomical applications, cryogenic receivers are widely used to achieve a high-sensitivity. These cryogenic receivers, in particular the receivers for the cosmic microwave background, require that the RAM has low surface reflectance ($\\lesssim 1\\%$) in a wide frequency range (20--300 GHz) to minimize the undesired stray light to detectors. We develop a RAM that satisfies this requirement based on a production technology using a 3D-printed mold (named as RAM-3pm). This method allows us to shape "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.14237","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2105.14237/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":"2026-07-05T03:12:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ygTPbBzhrMCZbM9/bvlGJdLuk5X+PVbMMY2A1y5uh6EUKCaYRaqjPqvGI3Vnu52ByhQD1SmSzsr+tZEsH9yRDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T17:00:43.590784Z"},"content_sha256":"dbd183dfc453139a36cb8b41f6cb463fbd887bd088436dbbb7618a31858fc8f1","schema_version":"1.0","event_id":"sha256:dbd183dfc453139a36cb8b41f6cb463fbd887bd088436dbbb7618a31858fc8f1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VABPA6YPMUMSOLZD4WRKOVDCWD/bundle.json","state_url":"https://pith.science/pith/VABPA6YPMUMSOLZD4WRKOVDCWD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VABPA6YPMUMSOLZD4WRKOVDCWD/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":"2026-07-06T17:00:43Z","links":{"resolver":"https://pith.science/pith/VABPA6YPMUMSOLZD4WRKOVDCWD","bundle":"https://pith.science/pith/VABPA6YPMUMSOLZD4WRKOVDCWD/bundle.json","state":"https://pith.science/pith/VABPA6YPMUMSOLZD4WRKOVDCWD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VABPA6YPMUMSOLZD4WRKOVDCWD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:VABPA6YPMUMSOLZD4WRKOVDCWD","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":"d63aa67b62c9e6cdcc580a3c7e877e3445218862363d7ae98e1ed5a0f63991a7","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-05-29T07:12:01Z","title_canon_sha256":"457baff0e983ef00ffb2b4917d20752669fadb6adb0b68cbc43ff0b472d32952"},"schema_version":"1.0","source":{"id":"2105.14237","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.14237","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"arxiv_version","alias_value":"2105.14237v1","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.14237","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"pith_short_12","alias_value":"VABPA6YPMUMS","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"pith_short_16","alias_value":"VABPA6YPMUMSOLZD","created_at":"2026-07-05T03:12:06Z"},{"alias_kind":"pith_short_8","alias_value":"VABPA6YP","created_at":"2026-07-05T03:12:06Z"}],"graph_snapshots":[{"event_id":"sha256:dbd183dfc453139a36cb8b41f6cb463fbd887bd088436dbbb7618a31858fc8f1","target":"graph","created_at":"2026-07-05T03:12:06Z","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/2105.14237/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Radio absorptive materials (RAMs) are key elements for receivers in the millimeter-wave range. For astronomical applications, cryogenic receivers are widely used to achieve a high-sensitivity. These cryogenic receivers, in particular the receivers for the cosmic microwave background, require that the RAM has low surface reflectance ($\\lesssim 1\\%$) in a wide frequency range (20--300 GHz) to minimize the undesired stray light to detectors. We develop a RAM that satisfies this requirement based on a production technology using a 3D-printed mold (named as RAM-3pm). This method allows us to shape ","authors_text":"M. Hattori, O. Tajima, S. Adachi, T. Otsuka, Y. Sakurai","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-05-29T07:12:01Z","title":"Material survey for millimeter-wave absorber using 3-D printed mold"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.14237","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:c7c3a2a50c25b84c319a24fc98f52cfd3aaf5c86a5cc8d67419e2938075e3a6e","target":"record","created_at":"2026-07-05T03:12:06Z","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":"d63aa67b62c9e6cdcc580a3c7e877e3445218862363d7ae98e1ed5a0f63991a7","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-05-29T07:12:01Z","title_canon_sha256":"457baff0e983ef00ffb2b4917d20752669fadb6adb0b68cbc43ff0b472d32952"},"schema_version":"1.0","source":{"id":"2105.14237","kind":"arxiv","version":1}},"canonical_sha256":"a802f07b0f6519272f23e5a2a75462b0df2928cbaa87804b2c1d746bf169c861","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a802f07b0f6519272f23e5a2a75462b0df2928cbaa87804b2c1d746bf169c861","first_computed_at":"2026-07-05T03:12:06.102365Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:12:06.102365Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LEBbS9woxWFIurbEXlKA7auhtjR7LqJoAhUTQq7Zg0J0M2UM8ujCaAIy1GaXTQ8dHa9sO4G1Sl0H2pkFPEXeCw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:12:06.102826Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.14237","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c7c3a2a50c25b84c319a24fc98f52cfd3aaf5c86a5cc8d67419e2938075e3a6e","sha256:dbd183dfc453139a36cb8b41f6cb463fbd887bd088436dbbb7618a31858fc8f1"],"state_sha256":"3792cb226ffa847adf692cf97b443cf80c4725a25df633f0ccb75fdcfd93a7cc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I4vwuUGmNpM0S41IMNcu7qmSGNWiNBV0gW/tGfgMQXo0f78tMa79ZqbSJ69BTqDD9G99MuhAf2aERl/o5wBCAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T17:00:43.592704Z","bundle_sha256":"f6307bc171acc5a79de21d0cabf55b2ed790799228357ea5785500ba3e30e1e8"}}