{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:ZCBFK43LBEMOTG7XU45KASGHEK","short_pith_number":"pith:ZCBFK43L","canonical_record":{"source":{"id":"2606.24028","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-06-23T00:07:50Z","cross_cats_sorted":[],"title_canon_sha256":"e17ab05e0211a608a964c7facbefd619398078f553211f4fb1d97947de0051b4","abstract_canon_sha256":"72d60e27650e30d0e732e55c12efd035289fcfd7b84c1fe4a8c137611074d4bf"},"schema_version":"1.0"},"canonical_sha256":"c88255736b0918e99bf7a73aa048c722a151bc06ad629e96e2d689d07f14a334","source":{"kind":"arxiv","id":"2606.24028","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.24028","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"arxiv_version","alias_value":"2606.24028v1","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.24028","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"pith_short_12","alias_value":"ZCBFK43LBEMO","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"pith_short_16","alias_value":"ZCBFK43LBEMOTG7X","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"pith_short_8","alias_value":"ZCBFK43L","created_at":"2026-06-24T01:14:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:ZCBFK43LBEMOTG7XU45KASGHEK","target":"record","payload":{"canonical_record":{"source":{"id":"2606.24028","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-06-23T00:07:50Z","cross_cats_sorted":[],"title_canon_sha256":"e17ab05e0211a608a964c7facbefd619398078f553211f4fb1d97947de0051b4","abstract_canon_sha256":"72d60e27650e30d0e732e55c12efd035289fcfd7b84c1fe4a8c137611074d4bf"},"schema_version":"1.0"},"canonical_sha256":"c88255736b0918e99bf7a73aa048c722a151bc06ad629e96e2d689d07f14a334","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-24T01:14:38.513863Z","signature_b64":"BKpDN2pK/K+IbGDKDBIG9p2Z3RG8Mb0sc/fOp4hIkohk2jfBcuNF2Mtfel2xGTc44NS0kWB5s8x7Jkc7ib7sCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c88255736b0918e99bf7a73aa048c722a151bc06ad629e96e2d689d07f14a334","last_reissued_at":"2026-06-24T01:14:38.513467Z","signature_status":"signed_v1","first_computed_at":"2026-06-24T01:14:38.513467Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.24028","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":"2026-06-24T01:14:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eI67H799cROpSKZot3WwE/I1s9PXRX/xdPFv2m9+A89Pc/OgTSzgSKliCq4f3dlzEWIQiACg6W3NUd4inmolCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T17:14:21.302461Z"},"content_sha256":"4321d29c102a72fbea3efbfb17682c8181bba8e42d81ccfc960ad5f1caf94d70","schema_version":"1.0","event_id":"sha256:4321d29c102a72fbea3efbfb17682c8181bba8e42d81ccfc960ad5f1caf94d70"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:ZCBFK43LBEMOTG7XU45KASGHEK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Micron-Scale Technosignatures: How a Cubic Metre of Lunar Regolith May Begin to Constrain the Number of Past Technological Civilisations in the Galaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Andrew P. V. Siemion, Brian C. Lacki, Ian A. Crawford, Lewis J. Pinault","submitted_at":"2026-06-23T00:07:50Z","abstract_excerpt":"Building on Arkhipov's proposal that technogenic artefacts may survive natural interstellar transport and accumulate on airless Solar System bodies, we examine the prospects for identifying micron-scale engineered particulate material within the lunar regolith. We analyse the transport of micron and submicron grains through the interstellar medium, including gas drag, sputtering, and ISM phase-dependent survival, and show that refractory particles with characteristic radii of order 0.3 microns may traverse kiloparsec scales over residence times of 0.1-1 Gyr. Solar radiation pressure and helios"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.24028","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/2606.24028/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":"2026-06-24T01:14:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WPd9NOX27uUnnQ3gdJhN+ZDx0KXnI1mSH/D1zAT3nHqmGkBDAZC3oh9x/iEKEmL5zh1VB6p3sXNgX/jb0lSoAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T17:14:21.302861Z"},"content_sha256":"9b27c0387af084e5973c841a0071ddb9d89659b2affe3e8a270a5cb1cfcac2ed","schema_version":"1.0","event_id":"sha256:9b27c0387af084e5973c841a0071ddb9d89659b2affe3e8a270a5cb1cfcac2ed"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZCBFK43LBEMOTG7XU45KASGHEK/bundle.json","state_url":"https://pith.science/pith/ZCBFK43LBEMOTG7XU45KASGHEK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZCBFK43LBEMOTG7XU45KASGHEK/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":"2026-06-26T17:14:21Z","links":{"resolver":"https://pith.science/pith/ZCBFK43LBEMOTG7XU45KASGHEK","bundle":"https://pith.science/pith/ZCBFK43LBEMOTG7XU45KASGHEK/bundle.json","state":"https://pith.science/pith/ZCBFK43LBEMOTG7XU45KASGHEK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZCBFK43LBEMOTG7XU45KASGHEK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:ZCBFK43LBEMOTG7XU45KASGHEK","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":"72d60e27650e30d0e732e55c12efd035289fcfd7b84c1fe4a8c137611074d4bf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-06-23T00:07:50Z","title_canon_sha256":"e17ab05e0211a608a964c7facbefd619398078f553211f4fb1d97947de0051b4"},"schema_version":"1.0","source":{"id":"2606.24028","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.24028","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"arxiv_version","alias_value":"2606.24028v1","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.24028","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"pith_short_12","alias_value":"ZCBFK43LBEMO","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"pith_short_16","alias_value":"ZCBFK43LBEMOTG7X","created_at":"2026-06-24T01:14:38Z"},{"alias_kind":"pith_short_8","alias_value":"ZCBFK43L","created_at":"2026-06-24T01:14:38Z"}],"graph_snapshots":[{"event_id":"sha256:9b27c0387af084e5973c841a0071ddb9d89659b2affe3e8a270a5cb1cfcac2ed","target":"graph","created_at":"2026-06-24T01:14:38Z","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/2606.24028/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Building on Arkhipov's proposal that technogenic artefacts may survive natural interstellar transport and accumulate on airless Solar System bodies, we examine the prospects for identifying micron-scale engineered particulate material within the lunar regolith. We analyse the transport of micron and submicron grains through the interstellar medium, including gas drag, sputtering, and ISM phase-dependent survival, and show that refractory particles with characteristic radii of order 0.3 microns may traverse kiloparsec scales over residence times of 0.1-1 Gyr. Solar radiation pressure and helios","authors_text":"Andrew P. V. Siemion, Brian C. Lacki, Ian A. Crawford, Lewis J. Pinault","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-06-23T00:07:50Z","title":"Micron-Scale Technosignatures: How a Cubic Metre of Lunar Regolith May Begin to Constrain the Number of Past Technological Civilisations in the Galaxy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.24028","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":"sha256:4321d29c102a72fbea3efbfb17682c8181bba8e42d81ccfc960ad5f1caf94d70","target":"record","created_at":"2026-06-24T01:14:38Z","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":"72d60e27650e30d0e732e55c12efd035289fcfd7b84c1fe4a8c137611074d4bf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-06-23T00:07:50Z","title_canon_sha256":"e17ab05e0211a608a964c7facbefd619398078f553211f4fb1d97947de0051b4"},"schema_version":"1.0","source":{"id":"2606.24028","kind":"arxiv","version":1}},"canonical_sha256":"c88255736b0918e99bf7a73aa048c722a151bc06ad629e96e2d689d07f14a334","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c88255736b0918e99bf7a73aa048c722a151bc06ad629e96e2d689d07f14a334","first_computed_at":"2026-06-24T01:14:38.513467Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-24T01:14:38.513467Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BKpDN2pK/K+IbGDKDBIG9p2Z3RG8Mb0sc/fOp4hIkohk2jfBcuNF2Mtfel2xGTc44NS0kWB5s8x7Jkc7ib7sCQ==","signature_status":"signed_v1","signed_at":"2026-06-24T01:14:38.513863Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.24028","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4321d29c102a72fbea3efbfb17682c8181bba8e42d81ccfc960ad5f1caf94d70","sha256:9b27c0387af084e5973c841a0071ddb9d89659b2affe3e8a270a5cb1cfcac2ed"],"state_sha256":"49087330d352ce03420e51f2d12cb966c4615131632b9e2bacb31a884e64cbe8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X2f26huCeIVjOuM/3EZyUr5kdM6UUjCwoyokKPdCBRV2c4bhyUl6UA40ouW7kL7xL8uRSYeMoXQbsekyjDHmAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T17:14:21.304985Z","bundle_sha256":"2c2db32712f93925c8f422c6ac246bc8c0cc76a47df4bb2b0eee38c658efd1bc"}}