{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:MS5ZCD5X4MATAGONNZ23MMYOO3","short_pith_number":"pith:MS5ZCD5X","canonical_record":{"source":{"id":"2007.11669","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2020-07-22T20:53:43Z","cross_cats_sorted":[],"title_canon_sha256":"8869a2d66404ddaab9bc9381841133231abce13af617a0568fc5e91415a1ad89","abstract_canon_sha256":"0c84523eb80c7a959bab1e25a003f47600bd57b09ee6bb54956f24ed8d65bbde"},"schema_version":"1.0"},"canonical_sha256":"64bb910fb7e3013019cd6e75b6330e76ce722342e7545c9519176d96d076669f","source":{"kind":"arxiv","id":"2007.11669","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2007.11669","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"arxiv_version","alias_value":"2007.11669v1","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2007.11669","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"pith_short_12","alias_value":"MS5ZCD5X4MAT","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"pith_short_16","alias_value":"MS5ZCD5X4MATAGON","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"pith_short_8","alias_value":"MS5ZCD5X","created_at":"2026-07-05T02:16:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:MS5ZCD5X4MATAGONNZ23MMYOO3","target":"record","payload":{"canonical_record":{"source":{"id":"2007.11669","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2020-07-22T20:53:43Z","cross_cats_sorted":[],"title_canon_sha256":"8869a2d66404ddaab9bc9381841133231abce13af617a0568fc5e91415a1ad89","abstract_canon_sha256":"0c84523eb80c7a959bab1e25a003f47600bd57b09ee6bb54956f24ed8d65bbde"},"schema_version":"1.0"},"canonical_sha256":"64bb910fb7e3013019cd6e75b6330e76ce722342e7545c9519176d96d076669f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:16:46.895868Z","signature_b64":"NGKiDobv/c2Dlt7EXv+IEJPP7qcKCFT3XHi3Ga2t6kvkXbg1srmDEZ7FCFDLh+AB3wHwLLqOk3CZLfu01jqBDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"64bb910fb7e3013019cd6e75b6330e76ce722342e7545c9519176d96d076669f","last_reissued_at":"2026-07-05T02:16:46.895422Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:16:46.895422Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2007.11669","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":"2026-07-05T02:16:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vlXDmGNkOo6/jKKMnEqnXOldedweSTFkK3+rP5Uj87QkTXfQTRvfnKt8v6kqUDN1N1jzO3C5NUEjbWFxjfSGAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T09:06:53.916823Z"},"content_sha256":"14c3db454c73b4e95d5c10a61321c0a291456756d80106434fa12b73fcdd629c","schema_version":"1.0","event_id":"sha256:14c3db454c73b4e95d5c10a61321c0a291456756d80106434fa12b73fcdd629c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:MS5ZCD5X4MATAGONNZ23MMYOO3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Flexural response of concurrently 3D printed sandwich composite","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.app-ph","authors_text":"Bharath H S, Dileep Bonthu, Mrityunjay Doddamani, Pavana Prabhakar, Suhasini Gururaja","submitted_at":"2020-07-22T20:53:43Z","abstract_excerpt":"Among many lightweight materials used in marine applications, sandwich structures with syntactic foam core are promising because of lower water uptake in foam core amid face-sheets damage. HDPE (high-density polyethylene) filament is used to 3D print sandwich skin, and glass microballoon (GMB) reinforced HDPE syntactic foam filaments are used for the core. The optimized parameters are used to prepare blends of 20, 40, and 60 volume % of GMB in HDPE. These foamed blends are extruded in filament form to be subsequently used in commercially available fused filament fabrication (FFF) based 3D prin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2007.11669","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/2007.11669/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":"2026-07-05T02:16:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TegRM3WbRnDO52BPoIcI7u+Y5aMg7Ox6QWdbKaRA4uU1HN8UINeisVGRvuhXhOhKCfwrPnLIfCrp1xRNleESAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T09:06:53.917326Z"},"content_sha256":"acfaa456f04ac206b3769840bc119a7d1125a238df49111c97bbf4e0cd04c46a","schema_version":"1.0","event_id":"sha256:acfaa456f04ac206b3769840bc119a7d1125a238df49111c97bbf4e0cd04c46a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MS5ZCD5X4MATAGONNZ23MMYOO3/bundle.json","state_url":"https://pith.science/pith/MS5ZCD5X4MATAGONNZ23MMYOO3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MS5ZCD5X4MATAGONNZ23MMYOO3/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":"2026-08-23T09:06:53Z","links":{"resolver":"https://pith.science/pith/MS5ZCD5X4MATAGONNZ23MMYOO3","bundle":"https://pith.science/pith/MS5ZCD5X4MATAGONNZ23MMYOO3/bundle.json","state":"https://pith.science/pith/MS5ZCD5X4MATAGONNZ23MMYOO3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MS5ZCD5X4MATAGONNZ23MMYOO3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:MS5ZCD5X4MATAGONNZ23MMYOO3","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":"0c84523eb80c7a959bab1e25a003f47600bd57b09ee6bb54956f24ed8d65bbde","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2020-07-22T20:53:43Z","title_canon_sha256":"8869a2d66404ddaab9bc9381841133231abce13af617a0568fc5e91415a1ad89"},"schema_version":"1.0","source":{"id":"2007.11669","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2007.11669","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"arxiv_version","alias_value":"2007.11669v1","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2007.11669","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"pith_short_12","alias_value":"MS5ZCD5X4MAT","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"pith_short_16","alias_value":"MS5ZCD5X4MATAGON","created_at":"2026-07-05T02:16:46Z"},{"alias_kind":"pith_short_8","alias_value":"MS5ZCD5X","created_at":"2026-07-05T02:16:46Z"}],"graph_snapshots":[{"event_id":"sha256:acfaa456f04ac206b3769840bc119a7d1125a238df49111c97bbf4e0cd04c46a","target":"graph","created_at":"2026-07-05T02:16:46Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2007.11669/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Among many lightweight materials used in marine applications, sandwich structures with syntactic foam core are promising because of lower water uptake in foam core amid face-sheets damage. HDPE (high-density polyethylene) filament is used to 3D print sandwich skin, and glass microballoon (GMB) reinforced HDPE syntactic foam filaments are used for the core. The optimized parameters are used to prepare blends of 20, 40, and 60 volume % of GMB in HDPE. These foamed blends are extruded in filament form to be subsequently used in commercially available fused filament fabrication (FFF) based 3D prin","authors_text":"Bharath H S, Dileep Bonthu, Mrityunjay Doddamani, Pavana Prabhakar, Suhasini Gururaja","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2020-07-22T20:53:43Z","title":"Flexural response of concurrently 3D printed sandwich composite"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2007.11669","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":"sha256:14c3db454c73b4e95d5c10a61321c0a291456756d80106434fa12b73fcdd629c","target":"record","created_at":"2026-07-05T02:16:46Z","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":"0c84523eb80c7a959bab1e25a003f47600bd57b09ee6bb54956f24ed8d65bbde","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2020-07-22T20:53:43Z","title_canon_sha256":"8869a2d66404ddaab9bc9381841133231abce13af617a0568fc5e91415a1ad89"},"schema_version":"1.0","source":{"id":"2007.11669","kind":"arxiv","version":1}},"canonical_sha256":"64bb910fb7e3013019cd6e75b6330e76ce722342e7545c9519176d96d076669f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"64bb910fb7e3013019cd6e75b6330e76ce722342e7545c9519176d96d076669f","first_computed_at":"2026-07-05T02:16:46.895422Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:16:46.895422Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NGKiDobv/c2Dlt7EXv+IEJPP7qcKCFT3XHi3Ga2t6kvkXbg1srmDEZ7FCFDLh+AB3wHwLLqOk3CZLfu01jqBDA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:16:46.895868Z","signed_message":"canonical_sha256_bytes"},"source_id":"2007.11669","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:14c3db454c73b4e95d5c10a61321c0a291456756d80106434fa12b73fcdd629c","sha256:acfaa456f04ac206b3769840bc119a7d1125a238df49111c97bbf4e0cd04c46a"],"state_sha256":"b5dbbe7861cdeec8d8ffb28c481854acf71c04d715cc38a5c6d4476d866fd9e1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4QbhiqsQOVxGwW6u18h8oxVpHeCNeT9UbXhRY4w2gOcFqXbfLxL8KuVzOODBD1gaE686g2bfi5p/hnSEGx5lBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T09:06:53.922207Z","bundle_sha256":"6ac10af4bd1bfe96d5215f6f6650415c9c1c322293e1a6c59524b8593904c2ee"}}