{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:ZMJBQW2PHARMXKXUDUUFZUW3JY","short_pith_number":"pith:ZMJBQW2P","canonical_record":{"source":{"id":"1511.00766","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-11-03T03:38:36Z","cross_cats_sorted":[],"title_canon_sha256":"24ed76de6a364733d965738c0ce3835d6c5c0a721ec86c7e995c0a78656775f3","abstract_canon_sha256":"40cf7115fa99567ef0f338b4f30388f59c49764fc965c3a49460c91afc1ec631"},"schema_version":"1.0"},"canonical_sha256":"cb12185b4f3822cbaaf41d285cd2db4e0759ba8be784b00bda68acbb92a7c7ae","source":{"kind":"arxiv","id":"1511.00766","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.00766","created_at":"2026-05-18T01:19:20Z"},{"alias_kind":"arxiv_version","alias_value":"1511.00766v1","created_at":"2026-05-18T01:19:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.00766","created_at":"2026-05-18T01:19:20Z"},{"alias_kind":"pith_short_12","alias_value":"ZMJBQW2PHARM","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"ZMJBQW2PHARMXKXU","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"ZMJBQW2P","created_at":"2026-05-18T12:29:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:ZMJBQW2PHARMXKXUDUUFZUW3JY","target":"record","payload":{"canonical_record":{"source":{"id":"1511.00766","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-11-03T03:38:36Z","cross_cats_sorted":[],"title_canon_sha256":"24ed76de6a364733d965738c0ce3835d6c5c0a721ec86c7e995c0a78656775f3","abstract_canon_sha256":"40cf7115fa99567ef0f338b4f30388f59c49764fc965c3a49460c91afc1ec631"},"schema_version":"1.0"},"canonical_sha256":"cb12185b4f3822cbaaf41d285cd2db4e0759ba8be784b00bda68acbb92a7c7ae","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:19:20.328597Z","signature_b64":"LoMgKniFr6XUWVvnvWtMpAwc7vcOQhe2qQN4E9BHN+j7FmX6cPIfa4UaDegX3UQ4vNhiyiYU+SlOOO9UgMlwCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cb12185b4f3822cbaaf41d285cd2db4e0759ba8be784b00bda68acbb92a7c7ae","last_reissued_at":"2026-05-18T01:19:20.328118Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:19:20.328118Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1511.00766","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":"2026-05-18T01:19:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/c3lGJbQDRjdpDFXk869/eBCNOhIQZQYgQNmqld9iTca1/UOGMG83ZGtEbO1KIm4tKgUPaxrwK2LGQeID/KxAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:27:08.856096Z"},"content_sha256":"1177a2a003d23eeb172e65610db0b8947f0416389a9d116ded137dda39b80588","schema_version":"1.0","event_id":"sha256:1177a2a003d23eeb172e65610db0b8947f0416389a9d116ded137dda39b80588"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:ZMJBQW2PHARMXKXUDUUFZUW3JY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Boulders on asteroid Toutatis as observed by Chang'e-2","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Jiangchuan Huang, Jianghui Ji, Simone Marchi, Wing-Huen Ip, Yuan Li, Yun Jiang","submitted_at":"2015-11-03T03:38:36Z","abstract_excerpt":"Boulders are ubiquitously found on the surfaces of small rocky bodies in the inner solar system and their spatial and size distributions give insight into the geological evolution and collisional history of the parent bodies. Using images acquired by the Chang'e-2 spacecraft, more than 200 boulders have been identified over the imaged area of the near-Earth asteroid Toutatis. The cumulative boulder size frequency distribution (SFD) shows a steep slope of -4.4 $\\pm$ 0.1, which is indicative of a high degree of fragmentation. Similar to Itokawa, Toutatis probably has a rubble-pile structure, as "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.00766","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":"2026-05-18T01:19:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ayTH4cIWq0UVNrOGcxtv5UmeR6tPtlMskaHHaf2/cwGWHCv1b9L3p8TIWKShLu/56yYSChdGCA6Ie45n8kMZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:27:08.856747Z"},"content_sha256":"71c512921ad3c294634a0f77c7e1f1f1c0be5493459cf159b454013bd46b8470","schema_version":"1.0","event_id":"sha256:71c512921ad3c294634a0f77c7e1f1f1c0be5493459cf159b454013bd46b8470"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZMJBQW2PHARMXKXUDUUFZUW3JY/bundle.json","state_url":"https://pith.science/pith/ZMJBQW2PHARMXKXUDUUFZUW3JY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZMJBQW2PHARMXKXUDUUFZUW3JY/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":"2026-05-25T15:27:08Z","links":{"resolver":"https://pith.science/pith/ZMJBQW2PHARMXKXUDUUFZUW3JY","bundle":"https://pith.science/pith/ZMJBQW2PHARMXKXUDUUFZUW3JY/bundle.json","state":"https://pith.science/pith/ZMJBQW2PHARMXKXUDUUFZUW3JY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZMJBQW2PHARMXKXUDUUFZUW3JY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ZMJBQW2PHARMXKXUDUUFZUW3JY","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":"40cf7115fa99567ef0f338b4f30388f59c49764fc965c3a49460c91afc1ec631","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-11-03T03:38:36Z","title_canon_sha256":"24ed76de6a364733d965738c0ce3835d6c5c0a721ec86c7e995c0a78656775f3"},"schema_version":"1.0","source":{"id":"1511.00766","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.00766","created_at":"2026-05-18T01:19:20Z"},{"alias_kind":"arxiv_version","alias_value":"1511.00766v1","created_at":"2026-05-18T01:19:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.00766","created_at":"2026-05-18T01:19:20Z"},{"alias_kind":"pith_short_12","alias_value":"ZMJBQW2PHARM","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"ZMJBQW2PHARMXKXU","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"ZMJBQW2P","created_at":"2026-05-18T12:29:52Z"}],"graph_snapshots":[{"event_id":"sha256:71c512921ad3c294634a0f77c7e1f1f1c0be5493459cf159b454013bd46b8470","target":"graph","created_at":"2026-05-18T01:19:20Z","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":"Boulders are ubiquitously found on the surfaces of small rocky bodies in the inner solar system and their spatial and size distributions give insight into the geological evolution and collisional history of the parent bodies. Using images acquired by the Chang'e-2 spacecraft, more than 200 boulders have been identified over the imaged area of the near-Earth asteroid Toutatis. The cumulative boulder size frequency distribution (SFD) shows a steep slope of -4.4 $\\pm$ 0.1, which is indicative of a high degree of fragmentation. Similar to Itokawa, Toutatis probably has a rubble-pile structure, as ","authors_text":"Jiangchuan Huang, Jianghui Ji, Simone Marchi, Wing-Huen Ip, Yuan Li, Yun Jiang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-11-03T03:38:36Z","title":"Boulders on asteroid Toutatis as observed by Chang'e-2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.00766","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":"sha256:1177a2a003d23eeb172e65610db0b8947f0416389a9d116ded137dda39b80588","target":"record","created_at":"2026-05-18T01:19:20Z","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":"40cf7115fa99567ef0f338b4f30388f59c49764fc965c3a49460c91afc1ec631","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-11-03T03:38:36Z","title_canon_sha256":"24ed76de6a364733d965738c0ce3835d6c5c0a721ec86c7e995c0a78656775f3"},"schema_version":"1.0","source":{"id":"1511.00766","kind":"arxiv","version":1}},"canonical_sha256":"cb12185b4f3822cbaaf41d285cd2db4e0759ba8be784b00bda68acbb92a7c7ae","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cb12185b4f3822cbaaf41d285cd2db4e0759ba8be784b00bda68acbb92a7c7ae","first_computed_at":"2026-05-18T01:19:20.328118Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:20.328118Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LoMgKniFr6XUWVvnvWtMpAwc7vcOQhe2qQN4E9BHN+j7FmX6cPIfa4UaDegX3UQ4vNhiyiYU+SlOOO9UgMlwCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:20.328597Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.00766","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1177a2a003d23eeb172e65610db0b8947f0416389a9d116ded137dda39b80588","sha256:71c512921ad3c294634a0f77c7e1f1f1c0be5493459cf159b454013bd46b8470"],"state_sha256":"2e2fae7960042f2b0dcfac7731b35dcb17b1ca17c3a7cdd474b059461757623d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mMILhhZKiOuhE+zDA6S8r1d/TMZ3qJorfQpwgtDeZpEX/9lUSQ37uNk8BDtvUgB5iPKAynuoYhFos4xx08YAAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T15:27:08.860670Z","bundle_sha256":"270570cd073a276134fd11bdb22b3c7aeabe29b68bf336a4dcff874328fb6a2f"}}