{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:B45SA5VCLKM6FT2GZLN4RKILVE","short_pith_number":"pith:B45SA5VC","canonical_record":{"source":{"id":"1204.3638","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2012-04-16T20:03:44Z","cross_cats_sorted":[],"title_canon_sha256":"a54a86ebe25c0e16738caf96a0846549b0840b4ef0d182a265d947377a0fdfb1","abstract_canon_sha256":"384707df86aa90fa19e932c9d9d0897dfed5bd515c767155726e23d97b0713ba"},"schema_version":"1.0"},"canonical_sha256":"0f3b2076a25a99e2cf46cadbc8a90ba92890dbaaaea59bbbf4846738ccaa2f89","source":{"kind":"arxiv","id":"1204.3638","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3638","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3638v1","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3638","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"pith_short_12","alias_value":"B45SA5VCLKM6","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"B45SA5VCLKM6FT2G","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"B45SA5VC","created_at":"2026-05-18T12:26:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:B45SA5VCLKM6FT2GZLN4RKILVE","target":"record","payload":{"canonical_record":{"source":{"id":"1204.3638","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2012-04-16T20:03:44Z","cross_cats_sorted":[],"title_canon_sha256":"a54a86ebe25c0e16738caf96a0846549b0840b4ef0d182a265d947377a0fdfb1","abstract_canon_sha256":"384707df86aa90fa19e932c9d9d0897dfed5bd515c767155726e23d97b0713ba"},"schema_version":"1.0"},"canonical_sha256":"0f3b2076a25a99e2cf46cadbc8a90ba92890dbaaaea59bbbf4846738ccaa2f89","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:51.779593Z","signature_b64":"7n9TeOmy3klgxn0CcB+OEq8uIcYxKFy/g0DxQyxCYZSGqy7U87fl0Fj4sPEAmsJE8lRVsSSc/9wy8ynqVu99Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0f3b2076a25a99e2cf46cadbc8a90ba92890dbaaaea59bbbf4846738ccaa2f89","last_reissued_at":"2026-05-18T01:57:51.779153Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:51.779153Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.3638","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":"2026-05-18T01:57:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4J0TjsoTvaJKanh0UnVx89PN5e9qdPgnbz8DJ0VtsKv8qYupaNL2l+ce/RRuM0BV4haSTD4ZVafu9SFvnAP3Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T08:14:43.542957Z"},"content_sha256":"a9bfcb26b63ce58e9c8981652263b9b6dbf879b912fc2c1c5b28c2004ed793e5","schema_version":"1.0","event_id":"sha256:a9bfcb26b63ce58e9c8981652263b9b6dbf879b912fc2c1c5b28c2004ed793e5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:B45SA5VCLKM6FT2GZLN4RKILVE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Water ice in the Kuiper belt","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"E.L. Schaller, M.E. Brown, W.C. Fraser","submitted_at":"2012-04-16T20:03:44Z","abstract_excerpt":"We examine a large collection of low resolution near-infrared spectra of Kuiper belt objects and centaurs in an attempt to understand the presence of water ice in the Kuiper belt. We find that water ice on the surface of these objects occurs in three separate manners: (1) Haumea family members uniquely show surfaces of nearly pure water ice, presumably a consequence of the fragmentation of the icy mantle of a larger differentiated proto-Haumea; (2) large objects with absolute magnitudes of $H<3$ (and a limited number to H=4.5) have surface coverings of water ice - perhaps mixed with ammonia - "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3638","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":"2026-05-18T01:57:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JS+Ao7eW+8yIL8JdIzLDdz2VbuPbG3CX47Rvl7DQ1imMnx6+5hzDHdy3Ds1STu4dOtjwMcGtVyPcQ8B8t/0FDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T08:14:43.543302Z"},"content_sha256":"90c7a6ab0332bee3b99fab8d9b387f997f23c788810bd51a5d5772d4f1cf0355","schema_version":"1.0","event_id":"sha256:90c7a6ab0332bee3b99fab8d9b387f997f23c788810bd51a5d5772d4f1cf0355"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/B45SA5VCLKM6FT2GZLN4RKILVE/bundle.json","state_url":"https://pith.science/pith/B45SA5VCLKM6FT2GZLN4RKILVE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/B45SA5VCLKM6FT2GZLN4RKILVE/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":"2026-06-12T08:14:43Z","links":{"resolver":"https://pith.science/pith/B45SA5VCLKM6FT2GZLN4RKILVE","bundle":"https://pith.science/pith/B45SA5VCLKM6FT2GZLN4RKILVE/bundle.json","state":"https://pith.science/pith/B45SA5VCLKM6FT2GZLN4RKILVE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/B45SA5VCLKM6FT2GZLN4RKILVE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:B45SA5VCLKM6FT2GZLN4RKILVE","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":"384707df86aa90fa19e932c9d9d0897dfed5bd515c767155726e23d97b0713ba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2012-04-16T20:03:44Z","title_canon_sha256":"a54a86ebe25c0e16738caf96a0846549b0840b4ef0d182a265d947377a0fdfb1"},"schema_version":"1.0","source":{"id":"1204.3638","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3638","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3638v1","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3638","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"pith_short_12","alias_value":"B45SA5VCLKM6","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"B45SA5VCLKM6FT2G","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"B45SA5VC","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:90c7a6ab0332bee3b99fab8d9b387f997f23c788810bd51a5d5772d4f1cf0355","target":"graph","created_at":"2026-05-18T01:57:51Z","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":"We examine a large collection of low resolution near-infrared spectra of Kuiper belt objects and centaurs in an attempt to understand the presence of water ice in the Kuiper belt. We find that water ice on the surface of these objects occurs in three separate manners: (1) Haumea family members uniquely show surfaces of nearly pure water ice, presumably a consequence of the fragmentation of the icy mantle of a larger differentiated proto-Haumea; (2) large objects with absolute magnitudes of $H<3$ (and a limited number to H=4.5) have surface coverings of water ice - perhaps mixed with ammonia - ","authors_text":"E.L. Schaller, M.E. Brown, W.C. Fraser","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2012-04-16T20:03:44Z","title":"Water ice in the Kuiper belt"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3638","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:a9bfcb26b63ce58e9c8981652263b9b6dbf879b912fc2c1c5b28c2004ed793e5","target":"record","created_at":"2026-05-18T01:57:51Z","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":"384707df86aa90fa19e932c9d9d0897dfed5bd515c767155726e23d97b0713ba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2012-04-16T20:03:44Z","title_canon_sha256":"a54a86ebe25c0e16738caf96a0846549b0840b4ef0d182a265d947377a0fdfb1"},"schema_version":"1.0","source":{"id":"1204.3638","kind":"arxiv","version":1}},"canonical_sha256":"0f3b2076a25a99e2cf46cadbc8a90ba92890dbaaaea59bbbf4846738ccaa2f89","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0f3b2076a25a99e2cf46cadbc8a90ba92890dbaaaea59bbbf4846738ccaa2f89","first_computed_at":"2026-05-18T01:57:51.779153Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:51.779153Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7n9TeOmy3klgxn0CcB+OEq8uIcYxKFy/g0DxQyxCYZSGqy7U87fl0Fj4sPEAmsJE8lRVsSSc/9wy8ynqVu99Dg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:51.779593Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.3638","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a9bfcb26b63ce58e9c8981652263b9b6dbf879b912fc2c1c5b28c2004ed793e5","sha256:90c7a6ab0332bee3b99fab8d9b387f997f23c788810bd51a5d5772d4f1cf0355"],"state_sha256":"3c77d444d3fb5cc2018247f57be9096f8d87d3df8edf0a03bab70eb299640515"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+QmuQCCNLf0Vqx4mEEnkDIwkM7Ky6o7eH+FFPwt/y3NGW0VD4SXprP8f1aE66Md905oCS3Vl32PjzGhGcUAmAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-12T08:14:43.545345Z","bundle_sha256":"3c8aea3b668484863ea0f8026e986ec422c7c25e35bbd48061185e6e30326152"}}