{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:52HUC2I4TT43G4HJZQUE5JZP5V","short_pith_number":"pith:52HUC2I4","canonical_record":{"source":{"id":"1601.02833","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-01-12T12:52:54Z","cross_cats_sorted":[],"title_canon_sha256":"9cedead69d2cc3d77ffec0fb32d855206ab47539b78c12eca0c7b5c0feb816c1","abstract_canon_sha256":"fc82de55007948f3f7255e8ceacbad4ebcbdf59420f0099e4c90adc581b3d55c"},"schema_version":"1.0"},"canonical_sha256":"ee8f41691c9cf9b370e9cc284ea72fed615cfcfdebb8131af620d45b37bdcdc4","source":{"kind":"arxiv","id":"1601.02833","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02833","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02833v1","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02833","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"pith_short_12","alias_value":"52HUC2I4TT43","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"52HUC2I4TT43G4HJ","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"52HUC2I4","created_at":"2026-05-18T12:29:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:52HUC2I4TT43G4HJZQUE5JZP5V","target":"record","payload":{"canonical_record":{"source":{"id":"1601.02833","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-01-12T12:52:54Z","cross_cats_sorted":[],"title_canon_sha256":"9cedead69d2cc3d77ffec0fb32d855206ab47539b78c12eca0c7b5c0feb816c1","abstract_canon_sha256":"fc82de55007948f3f7255e8ceacbad4ebcbdf59420f0099e4c90adc581b3d55c"},"schema_version":"1.0"},"canonical_sha256":"ee8f41691c9cf9b370e9cc284ea72fed615cfcfdebb8131af620d45b37bdcdc4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:20:32.216621Z","signature_b64":"5ms7PuLKxy5Qq8qi7nRTErSOEzXTkOZ/nsiCNtMMZZQifZhoDrfGgIon0ItE1Uyp6fxC/vKPYitMin21VUeIAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ee8f41691c9cf9b370e9cc284ea72fed615cfcfdebb8131af620d45b37bdcdc4","last_reissued_at":"2026-05-18T01:20:32.216229Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:20:32.216229Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.02833","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":"2026-05-18T01:20:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Nyw5hyqvVZB8SQyNU8JnZP0IpQj2Z+JWHSp7u4+bsJkL3tGZf1nPdwV1wPcqLB8wbaDIbejy3CHoyoj92lMuDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T15:49:52.738088Z"},"content_sha256":"cc2f8f63395139e81da696c97c54d2ba882cf4dd68d2977aaa704440b554e2bd","schema_version":"1.0","event_id":"sha256:cc2f8f63395139e81da696c97c54d2ba882cf4dd68d2977aaa704440b554e2bd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:52HUC2I4TT43G4HJZQUE5JZP5V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The surface age of Sputnik Planum, Pluto, must be less than 10 million years","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"David E. Trilling","submitted_at":"2016-01-12T12:52:54Z","abstract_excerpt":"Data from the New Horizons mission to Pluto show no craters on Sputnik Planum down to the detection limit (2 km for low resolution data, 625 m for high resolution data). The number of small Kuiper Belt Objects that should be impacting Pluto is known to some degree from various astronomical surveys. We combine these geological and telescopic observations to make an order of magnitude estimate that the surface age of Sputnik Planum must be less than 10 million years. This maximum surface age is surprisingly young and implies that this area of Pluto must be undergoing active resurfacing, presumab"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02833","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":"2026-05-18T01:20:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DlUyubNSjRhGGUt05QNduZhdCoSkxmNslWd19TrF6rZdMLloKjnS1a45RID0lksZgYPmDla7wIgS8ZzNPqPsBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T15:49:52.738455Z"},"content_sha256":"4a84e4571ec5b9ffa7aed00625496513b9150d87ae76db2551f3d2f83d6debeb","schema_version":"1.0","event_id":"sha256:4a84e4571ec5b9ffa7aed00625496513b9150d87ae76db2551f3d2f83d6debeb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/52HUC2I4TT43G4HJZQUE5JZP5V/bundle.json","state_url":"https://pith.science/pith/52HUC2I4TT43G4HJZQUE5JZP5V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/52HUC2I4TT43G4HJZQUE5JZP5V/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":"2026-06-05T15:49:52Z","links":{"resolver":"https://pith.science/pith/52HUC2I4TT43G4HJZQUE5JZP5V","bundle":"https://pith.science/pith/52HUC2I4TT43G4HJZQUE5JZP5V/bundle.json","state":"https://pith.science/pith/52HUC2I4TT43G4HJZQUE5JZP5V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/52HUC2I4TT43G4HJZQUE5JZP5V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:52HUC2I4TT43G4HJZQUE5JZP5V","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":"fc82de55007948f3f7255e8ceacbad4ebcbdf59420f0099e4c90adc581b3d55c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-01-12T12:52:54Z","title_canon_sha256":"9cedead69d2cc3d77ffec0fb32d855206ab47539b78c12eca0c7b5c0feb816c1"},"schema_version":"1.0","source":{"id":"1601.02833","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02833","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02833v1","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02833","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"pith_short_12","alias_value":"52HUC2I4TT43","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"52HUC2I4TT43G4HJ","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"52HUC2I4","created_at":"2026-05-18T12:29:58Z"}],"graph_snapshots":[{"event_id":"sha256:4a84e4571ec5b9ffa7aed00625496513b9150d87ae76db2551f3d2f83d6debeb","target":"graph","created_at":"2026-05-18T01:20:32Z","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":"Data from the New Horizons mission to Pluto show no craters on Sputnik Planum down to the detection limit (2 km for low resolution data, 625 m for high resolution data). The number of small Kuiper Belt Objects that should be impacting Pluto is known to some degree from various astronomical surveys. We combine these geological and telescopic observations to make an order of magnitude estimate that the surface age of Sputnik Planum must be less than 10 million years. This maximum surface age is surprisingly young and implies that this area of Pluto must be undergoing active resurfacing, presumab","authors_text":"David E. Trilling","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-01-12T12:52:54Z","title":"The surface age of Sputnik Planum, Pluto, must be less than 10 million years"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02833","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:cc2f8f63395139e81da696c97c54d2ba882cf4dd68d2977aaa704440b554e2bd","target":"record","created_at":"2026-05-18T01:20:32Z","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":"fc82de55007948f3f7255e8ceacbad4ebcbdf59420f0099e4c90adc581b3d55c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-01-12T12:52:54Z","title_canon_sha256":"9cedead69d2cc3d77ffec0fb32d855206ab47539b78c12eca0c7b5c0feb816c1"},"schema_version":"1.0","source":{"id":"1601.02833","kind":"arxiv","version":1}},"canonical_sha256":"ee8f41691c9cf9b370e9cc284ea72fed615cfcfdebb8131af620d45b37bdcdc4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ee8f41691c9cf9b370e9cc284ea72fed615cfcfdebb8131af620d45b37bdcdc4","first_computed_at":"2026-05-18T01:20:32.216229Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:20:32.216229Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5ms7PuLKxy5Qq8qi7nRTErSOEzXTkOZ/nsiCNtMMZZQifZhoDrfGgIon0ItE1Uyp6fxC/vKPYitMin21VUeIAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:20:32.216621Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.02833","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc2f8f63395139e81da696c97c54d2ba882cf4dd68d2977aaa704440b554e2bd","sha256:4a84e4571ec5b9ffa7aed00625496513b9150d87ae76db2551f3d2f83d6debeb"],"state_sha256":"0b3c07e0d6651e3d2ee0266c99d63520c74cce3335242e371eb69f45a817a76c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jk/IbuA2BS49NAmp9UrgiT4BSJRwqcuh2zWKtPxQ+YY9LtT2MULB4z+yp6vrr4Y1+tjB4C0oSOQTir2NiA4yBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T15:49:52.740626Z","bundle_sha256":"7b3897fcbee366af93623eb7fc9423325320d8cb5430d74a600bbd7b91d5136d"}}