{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:57FATBJBKJH7X522QL4MNGBBXC","short_pith_number":"pith:57FATBJB","canonical_record":{"source":{"id":"1701.00471","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-01-02T18:07:34Z","cross_cats_sorted":[],"title_canon_sha256":"1b520308516dfd5fedc4e3cc765c76eb31591d211598c6042c2227be6b1d2957","abstract_canon_sha256":"b35cb323f08666bb8a91db2b269f554d27619c027bb5f87bffd1c5e5f6c281cf"},"schema_version":"1.0"},"canonical_sha256":"efca098521524ffbf75a82f8c69821b89802104e0a3c7cfc64e52737b6e7ae82","source":{"kind":"arxiv","id":"1701.00471","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.00471","created_at":"2026-05-18T00:49:10Z"},{"alias_kind":"arxiv_version","alias_value":"1701.00471v1","created_at":"2026-05-18T00:49:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.00471","created_at":"2026-05-18T00:49:10Z"},{"alias_kind":"pith_short_12","alias_value":"57FATBJBKJH7","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"57FATBJBKJH7X522","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"57FATBJB","created_at":"2026-05-18T12:31:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:57FATBJBKJH7X522QL4MNGBBXC","target":"record","payload":{"canonical_record":{"source":{"id":"1701.00471","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-01-02T18:07:34Z","cross_cats_sorted":[],"title_canon_sha256":"1b520308516dfd5fedc4e3cc765c76eb31591d211598c6042c2227be6b1d2957","abstract_canon_sha256":"b35cb323f08666bb8a91db2b269f554d27619c027bb5f87bffd1c5e5f6c281cf"},"schema_version":"1.0"},"canonical_sha256":"efca098521524ffbf75a82f8c69821b89802104e0a3c7cfc64e52737b6e7ae82","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:49:10.301723Z","signature_b64":"N4+CcnMpfdG9e/TNBhn1B3kL1cVIfxiznQimAHi8W3fXPkyKFhSbv80fkikaPbJ8VqsDdlgdD6gJz42oEaZqCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"efca098521524ffbf75a82f8c69821b89802104e0a3c7cfc64e52737b6e7ae82","last_reissued_at":"2026-05-18T00:49:10.301127Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:49:10.301127Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.00471","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":"2026-05-18T00:49:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BAws0y9fIMcvwsGKfSjrSGc8+JrIReHRMRypO0Z4ZMvtf9/85DMOnRIkBuPgnqVyizX5n9k+bmXx8816LfmzDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T04:24:29.697475Z"},"content_sha256":"d239c6c7e5f40481489e19457a7f07bec826fb4376c6d89c664c674f6e2fbc84","schema_version":"1.0","event_id":"sha256:d239c6c7e5f40481489e19457a7f07bec826fb4376c6d89c664c674f6e2fbc84"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:57FATBJBKJH7X522QL4MNGBBXC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An analytical model of crater count equilibrium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Caleb I. Fassett, David A. Minton, Masatoshi Hirabayashi","submitted_at":"2017-01-02T18:07:34Z","abstract_excerpt":"Crater count equilibrium occurs when new craters form at the same rate that old craters are erased, such that the total number of observable impacts remains constant. Despite substantial efforts to understand this process, there remain many unsolved problems. Here, we propose an analytical model that describes how a heavily cratered surface reaches a state of crater count equilibrium. The proposed model formulates three physical processes contributing to crater count equilibrium: cookie-cutting (simple, geometric overlap), ejecta-blanketing, and sandblasting (diffusive erosion). These three pr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.00471","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":"2026-05-18T00:49:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EYixgmacoKR23LvNurGMt10IuCt7h2MdZhQtqbGM+tC5AJbRGFsQF1mHIkwR7iSbiZ5pT0S5X6juOFuhC8KUBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T04:24:29.698110Z"},"content_sha256":"74ce62dc118fca418e12673b6a49e30c09c03714eb449bacea580aa6eff8ac0c","schema_version":"1.0","event_id":"sha256:74ce62dc118fca418e12673b6a49e30c09c03714eb449bacea580aa6eff8ac0c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/57FATBJBKJH7X522QL4MNGBBXC/bundle.json","state_url":"https://pith.science/pith/57FATBJBKJH7X522QL4MNGBBXC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/57FATBJBKJH7X522QL4MNGBBXC/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":"2026-06-04T04:24:29Z","links":{"resolver":"https://pith.science/pith/57FATBJBKJH7X522QL4MNGBBXC","bundle":"https://pith.science/pith/57FATBJBKJH7X522QL4MNGBBXC/bundle.json","state":"https://pith.science/pith/57FATBJBKJH7X522QL4MNGBBXC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/57FATBJBKJH7X522QL4MNGBBXC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:57FATBJBKJH7X522QL4MNGBBXC","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":"b35cb323f08666bb8a91db2b269f554d27619c027bb5f87bffd1c5e5f6c281cf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-01-02T18:07:34Z","title_canon_sha256":"1b520308516dfd5fedc4e3cc765c76eb31591d211598c6042c2227be6b1d2957"},"schema_version":"1.0","source":{"id":"1701.00471","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.00471","created_at":"2026-05-18T00:49:10Z"},{"alias_kind":"arxiv_version","alias_value":"1701.00471v1","created_at":"2026-05-18T00:49:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.00471","created_at":"2026-05-18T00:49:10Z"},{"alias_kind":"pith_short_12","alias_value":"57FATBJBKJH7","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"57FATBJBKJH7X522","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"57FATBJB","created_at":"2026-05-18T12:31:00Z"}],"graph_snapshots":[{"event_id":"sha256:74ce62dc118fca418e12673b6a49e30c09c03714eb449bacea580aa6eff8ac0c","target":"graph","created_at":"2026-05-18T00:49:10Z","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"},"paper":{"abstract_excerpt":"Crater count equilibrium occurs when new craters form at the same rate that old craters are erased, such that the total number of observable impacts remains constant. Despite substantial efforts to understand this process, there remain many unsolved problems. Here, we propose an analytical model that describes how a heavily cratered surface reaches a state of crater count equilibrium. The proposed model formulates three physical processes contributing to crater count equilibrium: cookie-cutting (simple, geometric overlap), ejecta-blanketing, and sandblasting (diffusive erosion). These three pr","authors_text":"Caleb I. Fassett, David A. Minton, Masatoshi Hirabayashi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-01-02T18:07:34Z","title":"An analytical model of crater count equilibrium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.00471","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:d239c6c7e5f40481489e19457a7f07bec826fb4376c6d89c664c674f6e2fbc84","target":"record","created_at":"2026-05-18T00:49:10Z","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":"b35cb323f08666bb8a91db2b269f554d27619c027bb5f87bffd1c5e5f6c281cf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-01-02T18:07:34Z","title_canon_sha256":"1b520308516dfd5fedc4e3cc765c76eb31591d211598c6042c2227be6b1d2957"},"schema_version":"1.0","source":{"id":"1701.00471","kind":"arxiv","version":1}},"canonical_sha256":"efca098521524ffbf75a82f8c69821b89802104e0a3c7cfc64e52737b6e7ae82","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"efca098521524ffbf75a82f8c69821b89802104e0a3c7cfc64e52737b6e7ae82","first_computed_at":"2026-05-18T00:49:10.301127Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:49:10.301127Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"N4+CcnMpfdG9e/TNBhn1B3kL1cVIfxiznQimAHi8W3fXPkyKFhSbv80fkikaPbJ8VqsDdlgdD6gJz42oEaZqCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:49:10.301723Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.00471","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d239c6c7e5f40481489e19457a7f07bec826fb4376c6d89c664c674f6e2fbc84","sha256:74ce62dc118fca418e12673b6a49e30c09c03714eb449bacea580aa6eff8ac0c"],"state_sha256":"dd47872aeedfe5d4ecec3424fca8f007a7b258f2dbaf113cef0b0b0793973f18"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VviIL9CcrLZjtbR7PlgusZzbgmQ0Pn0TGffR9KSWeUX5zfJphy/m9rhrlBOz2WLe8Jgt0bROqnBxnloumETUAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T04:24:29.701426Z","bundle_sha256":"91acb8f0bcf73c7d0a7c6e22278426d769f7596d1641a502dd06bf284c6ec097"}}