{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:BMEQ6FFFMUQ2AZRAKFZMH3PGN3","short_pith_number":"pith:BMEQ6FFF","canonical_record":{"source":{"id":"1808.10246","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-30T12:17:50Z","cross_cats_sorted":[],"title_canon_sha256":"8cb9d8c1b5a8f20b702f58dcce75f4bc7edde757f45891b9076de7df49aba716","abstract_canon_sha256":"a810ee7a60505ed5639b975796edb9abbcd43042b3ffe1e126577dd1cf7220af"},"schema_version":"1.0"},"canonical_sha256":"0b090f14a56521a066205172c3ede66edb4560e35d820942a7735e6aa294784b","source":{"kind":"arxiv","id":"1808.10246","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.10246","created_at":"2026-05-18T00:06:49Z"},{"alias_kind":"arxiv_version","alias_value":"1808.10246v1","created_at":"2026-05-18T00:06:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.10246","created_at":"2026-05-18T00:06:49Z"},{"alias_kind":"pith_short_12","alias_value":"BMEQ6FFFMUQ2","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BMEQ6FFFMUQ2AZRA","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BMEQ6FFF","created_at":"2026-05-18T12:32:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:BMEQ6FFFMUQ2AZRAKFZMH3PGN3","target":"record","payload":{"canonical_record":{"source":{"id":"1808.10246","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-30T12:17:50Z","cross_cats_sorted":[],"title_canon_sha256":"8cb9d8c1b5a8f20b702f58dcce75f4bc7edde757f45891b9076de7df49aba716","abstract_canon_sha256":"a810ee7a60505ed5639b975796edb9abbcd43042b3ffe1e126577dd1cf7220af"},"schema_version":"1.0"},"canonical_sha256":"0b090f14a56521a066205172c3ede66edb4560e35d820942a7735e6aa294784b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:06:49.381531Z","signature_b64":"b2UeGwCgqHgqX45uJ8hzGJYJRd1xSNZxBNRXcpST6cc3Bi6tnW2Ald0V2dlzqq/96tO9HLL/vOgug/kR4d+XAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0b090f14a56521a066205172c3ede66edb4560e35d820942a7735e6aa294784b","last_reissued_at":"2026-05-18T00:06:49.380961Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:06:49.380961Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.10246","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":"2026-05-18T00:06:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fYP1o5WFQ67HWZDi1JjuLpPs4X13iPcjRATpFmp+a1xLeUS4LtFezu8TCO8jkOLqzdRA4cwJzw+t9dApQvW1CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T14:48:52.328136Z"},"content_sha256":"1574eace6d29b9612e51f3000e71b1623bdbaceb0b3a6d2a69c8a9997d42e15c","schema_version":"1.0","event_id":"sha256:1574eace6d29b9612e51f3000e71b1623bdbaceb0b3a6d2a69c8a9997d42e15c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:BMEQ6FFFMUQ2AZRAKFZMH3PGN3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Selective Aggregation Experiments on Planetesimal Formation and Mercury-Like Planets","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Gerhard Wurm","submitted_at":"2018-08-30T12:17:50Z","abstract_excerpt":"Much of a planet's composition could be determined right at the onset of formation. Laboratory experiments can constrain these early steps. This includes static tensile strength measurements or collisions carried out under Earth's gravity and on various microgravity platforms. Among the variety of extrasolar planets which eventually form are (Exo)-Mercury, terrestrial planets with high density. If they form in inner protoplanetary disks, high temperature experiments are mandatory but they are still rare. Beyond the initial process of hit-and-stick collisions, some additional selective processi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.10246","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":"2026-05-18T00:06:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N92L1F8J+Vny7jzco3N4/C0XHeraDiLthuf6GPqBzFT3smhFJy1Nwo6gpNI/9L6hsZok++80Jku9pWyOquxwCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T14:48:52.328751Z"},"content_sha256":"8190551ce12992820a9f1a59befd7f1b688c9f2d3fdf6dd184331f4339eba905","schema_version":"1.0","event_id":"sha256:8190551ce12992820a9f1a59befd7f1b688c9f2d3fdf6dd184331f4339eba905"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BMEQ6FFFMUQ2AZRAKFZMH3PGN3/bundle.json","state_url":"https://pith.science/pith/BMEQ6FFFMUQ2AZRAKFZMH3PGN3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BMEQ6FFFMUQ2AZRAKFZMH3PGN3/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":"2026-05-27T14:48:52Z","links":{"resolver":"https://pith.science/pith/BMEQ6FFFMUQ2AZRAKFZMH3PGN3","bundle":"https://pith.science/pith/BMEQ6FFFMUQ2AZRAKFZMH3PGN3/bundle.json","state":"https://pith.science/pith/BMEQ6FFFMUQ2AZRAKFZMH3PGN3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BMEQ6FFFMUQ2AZRAKFZMH3PGN3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:BMEQ6FFFMUQ2AZRAKFZMH3PGN3","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":"a810ee7a60505ed5639b975796edb9abbcd43042b3ffe1e126577dd1cf7220af","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-30T12:17:50Z","title_canon_sha256":"8cb9d8c1b5a8f20b702f58dcce75f4bc7edde757f45891b9076de7df49aba716"},"schema_version":"1.0","source":{"id":"1808.10246","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.10246","created_at":"2026-05-18T00:06:49Z"},{"alias_kind":"arxiv_version","alias_value":"1808.10246v1","created_at":"2026-05-18T00:06:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.10246","created_at":"2026-05-18T00:06:49Z"},{"alias_kind":"pith_short_12","alias_value":"BMEQ6FFFMUQ2","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BMEQ6FFFMUQ2AZRA","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BMEQ6FFF","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:8190551ce12992820a9f1a59befd7f1b688c9f2d3fdf6dd184331f4339eba905","target":"graph","created_at":"2026-05-18T00:06:49Z","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":"Much of a planet's composition could be determined right at the onset of formation. Laboratory experiments can constrain these early steps. This includes static tensile strength measurements or collisions carried out under Earth's gravity and on various microgravity platforms. Among the variety of extrasolar planets which eventually form are (Exo)-Mercury, terrestrial planets with high density. If they form in inner protoplanetary disks, high temperature experiments are mandatory but they are still rare. Beyond the initial process of hit-and-stick collisions, some additional selective processi","authors_text":"Gerhard Wurm","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-30T12:17:50Z","title":"Selective Aggregation Experiments on Planetesimal Formation and Mercury-Like Planets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.10246","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":"sha256:1574eace6d29b9612e51f3000e71b1623bdbaceb0b3a6d2a69c8a9997d42e15c","target":"record","created_at":"2026-05-18T00:06:49Z","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":"a810ee7a60505ed5639b975796edb9abbcd43042b3ffe1e126577dd1cf7220af","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-30T12:17:50Z","title_canon_sha256":"8cb9d8c1b5a8f20b702f58dcce75f4bc7edde757f45891b9076de7df49aba716"},"schema_version":"1.0","source":{"id":"1808.10246","kind":"arxiv","version":1}},"canonical_sha256":"0b090f14a56521a066205172c3ede66edb4560e35d820942a7735e6aa294784b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0b090f14a56521a066205172c3ede66edb4560e35d820942a7735e6aa294784b","first_computed_at":"2026-05-18T00:06:49.380961Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:49.380961Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"b2UeGwCgqHgqX45uJ8hzGJYJRd1xSNZxBNRXcpST6cc3Bi6tnW2Ald0V2dlzqq/96tO9HLL/vOgug/kR4d+XAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:49.381531Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.10246","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1574eace6d29b9612e51f3000e71b1623bdbaceb0b3a6d2a69c8a9997d42e15c","sha256:8190551ce12992820a9f1a59befd7f1b688c9f2d3fdf6dd184331f4339eba905"],"state_sha256":"0ed27fa5a3c524a09767e4c40fc3febc8c5aa7030adf50ce71ef7884078456a0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xv/G65yQXOcx7B4KVM2RY3eANt8X0m7QjruB9jv24yUotIm703vs6kgiKddspd4NFrrHZRYjEN4AT/EOlQN9Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T14:48:52.332256Z","bundle_sha256":"c6609aaa7b2cecb94cc333514c6637a63f0a77775718415b2574c5460fefe604"}}