{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:IMIO4OMSFVZ4ZGPEC7CXBBCTZQ","short_pith_number":"pith:IMIO4OMS","canonical_record":{"source":{"id":"2403.16105","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2024-03-24T11:49:53Z","cross_cats_sorted":[],"title_canon_sha256":"4faf21f66e8e56e05dd15c6cb7827f890753aabaa2bea03d6cebb526b7161013","abstract_canon_sha256":"1af316789842be9a2ccdf33b573a32c6d39b2d0ff485c335f99a821ce091135b"},"schema_version":"1.0"},"canonical_sha256":"4310ee39922d73cc99e417c5708453cc2b675a87d2735632deff762047eb84b8","source":{"kind":"arxiv","id":"2403.16105","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2403.16105","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"arxiv_version","alias_value":"2403.16105v1","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2403.16105","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"pith_short_12","alias_value":"IMIO4OMSFVZ4","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"pith_short_16","alias_value":"IMIO4OMSFVZ4ZGPE","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"pith_short_8","alias_value":"IMIO4OMS","created_at":"2026-07-05T08:00:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:IMIO4OMSFVZ4ZGPEC7CXBBCTZQ","target":"record","payload":{"canonical_record":{"source":{"id":"2403.16105","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2024-03-24T11:49:53Z","cross_cats_sorted":[],"title_canon_sha256":"4faf21f66e8e56e05dd15c6cb7827f890753aabaa2bea03d6cebb526b7161013","abstract_canon_sha256":"1af316789842be9a2ccdf33b573a32c6d39b2d0ff485c335f99a821ce091135b"},"schema_version":"1.0"},"canonical_sha256":"4310ee39922d73cc99e417c5708453cc2b675a87d2735632deff762047eb84b8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:00:10.629268Z","signature_b64":"Aq3IxGMb1WMnCGOd99KvuiZ/qJbzYR7ViDEfusGLD44y+Ta+rPHQakaK9rroJxfAqe2mG/cV+Ei+ub1nhEvqAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4310ee39922d73cc99e417c5708453cc2b675a87d2735632deff762047eb84b8","last_reissued_at":"2026-07-05T08:00:10.628792Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:00:10.628792Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2403.16105","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":"2026-07-05T08:00:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JwJ0nWoZPfbLZxB5m4uDQF1aR4LaLsEhcpOfxFU4t4r9hXOa6QbnvykKhoSk0dwcpbSFtFkg7dW329OIm/VYAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T07:33:12.769899Z"},"content_sha256":"69b4d7ec0f767be206c1d49753a7774aeea2208365bb8005aecf7097a2f6a1d4","schema_version":"1.0","event_id":"sha256:69b4d7ec0f767be206c1d49753a7774aeea2208365bb8005aecf7097a2f6a1d4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:IMIO4OMSFVZ4ZGPEC7CXBBCTZQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Viscoelastic material properties determine contact mechanics of hydrogel spheres","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.soft","authors_text":"Chandan Shakya, Jasper van der Gucht, Joshua A. Dijksman","submitted_at":"2024-03-24T11:49:53Z","abstract_excerpt":"Granular materials are ubiquitous in nature and industry; their mechanical behavior has been of academic and engineering interest for centuries. One of the reasons for their rather complex mechanical behavior is that stresses exerted on a granular material propagate only through contacts between the grains. These contacts can change as the packing evolves. This makes any deformation and mechanical response from a granular packing a function of the nature of contacts between the grains and the material response of the material the grains are made of. We present a study in which we isolate the r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2403.16105","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/2403.16105/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":"2026-07-05T08:00:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rHbbugngqnsPi/Q3Fee5eb8UvifO/ovrz9hcDnvb+FUlg4xmeswguDZcwvf49B9z6e5k/wkQHFX2gIpn9A0mDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T07:33:12.770610Z"},"content_sha256":"e5d9ed0f2e7c556365e213660db53d481d094d9c68ac6aa4b166ad79f92b5bb8","schema_version":"1.0","event_id":"sha256:e5d9ed0f2e7c556365e213660db53d481d094d9c68ac6aa4b166ad79f92b5bb8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IMIO4OMSFVZ4ZGPEC7CXBBCTZQ/bundle.json","state_url":"https://pith.science/pith/IMIO4OMSFVZ4ZGPEC7CXBBCTZQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IMIO4OMSFVZ4ZGPEC7CXBBCTZQ/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":"2026-07-07T07:33:12Z","links":{"resolver":"https://pith.science/pith/IMIO4OMSFVZ4ZGPEC7CXBBCTZQ","bundle":"https://pith.science/pith/IMIO4OMSFVZ4ZGPEC7CXBBCTZQ/bundle.json","state":"https://pith.science/pith/IMIO4OMSFVZ4ZGPEC7CXBBCTZQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IMIO4OMSFVZ4ZGPEC7CXBBCTZQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:IMIO4OMSFVZ4ZGPEC7CXBBCTZQ","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":"1af316789842be9a2ccdf33b573a32c6d39b2d0ff485c335f99a821ce091135b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2024-03-24T11:49:53Z","title_canon_sha256":"4faf21f66e8e56e05dd15c6cb7827f890753aabaa2bea03d6cebb526b7161013"},"schema_version":"1.0","source":{"id":"2403.16105","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2403.16105","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"arxiv_version","alias_value":"2403.16105v1","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2403.16105","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"pith_short_12","alias_value":"IMIO4OMSFVZ4","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"pith_short_16","alias_value":"IMIO4OMSFVZ4ZGPE","created_at":"2026-07-05T08:00:10Z"},{"alias_kind":"pith_short_8","alias_value":"IMIO4OMS","created_at":"2026-07-05T08:00:10Z"}],"graph_snapshots":[{"event_id":"sha256:e5d9ed0f2e7c556365e213660db53d481d094d9c68ac6aa4b166ad79f92b5bb8","target":"graph","created_at":"2026-07-05T08:00:10Z","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/2403.16105/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Granular materials are ubiquitous in nature and industry; their mechanical behavior has been of academic and engineering interest for centuries. One of the reasons for their rather complex mechanical behavior is that stresses exerted on a granular material propagate only through contacts between the grains. These contacts can change as the packing evolves. This makes any deformation and mechanical response from a granular packing a function of the nature of contacts between the grains and the material response of the material the grains are made of. We present a study in which we isolate the r","authors_text":"Chandan Shakya, Jasper van der Gucht, Joshua A. Dijksman","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2024-03-24T11:49:53Z","title":"Viscoelastic material properties determine contact mechanics of hydrogel spheres"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2403.16105","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":"sha256:69b4d7ec0f767be206c1d49753a7774aeea2208365bb8005aecf7097a2f6a1d4","target":"record","created_at":"2026-07-05T08:00:10Z","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":"1af316789842be9a2ccdf33b573a32c6d39b2d0ff485c335f99a821ce091135b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2024-03-24T11:49:53Z","title_canon_sha256":"4faf21f66e8e56e05dd15c6cb7827f890753aabaa2bea03d6cebb526b7161013"},"schema_version":"1.0","source":{"id":"2403.16105","kind":"arxiv","version":1}},"canonical_sha256":"4310ee39922d73cc99e417c5708453cc2b675a87d2735632deff762047eb84b8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4310ee39922d73cc99e417c5708453cc2b675a87d2735632deff762047eb84b8","first_computed_at":"2026-07-05T08:00:10.628792Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:00:10.628792Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Aq3IxGMb1WMnCGOd99KvuiZ/qJbzYR7ViDEfusGLD44y+Ta+rPHQakaK9rroJxfAqe2mG/cV+Ei+ub1nhEvqAw==","signature_status":"signed_v1","signed_at":"2026-07-05T08:00:10.629268Z","signed_message":"canonical_sha256_bytes"},"source_id":"2403.16105","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:69b4d7ec0f767be206c1d49753a7774aeea2208365bb8005aecf7097a2f6a1d4","sha256:e5d9ed0f2e7c556365e213660db53d481d094d9c68ac6aa4b166ad79f92b5bb8"],"state_sha256":"32aabea4f62ecf3dc1b2e84a973fa0868e519203f2e1bf62b7e54ca944add3ce"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WgK0Tkp7KLpJ0nypUD2p5JR+S+dTWS8Pb1cZZd5TWili6Zt7/a16dV2GVVktzHKkBsERCXMtxymK/sZ3EiAhBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T07:33:12.775147Z","bundle_sha256":"4e71bfaf4586f9bb418bfa26b217b450353eefd8296f039721ff12a5f5104ec0"}}