{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:Z3DRZGXGLIEA6DX5UQG2YCQHEM","short_pith_number":"pith:Z3DRZGXG","canonical_record":{"source":{"id":"1612.00495","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-01T22:09:23Z","cross_cats_sorted":[],"title_canon_sha256":"4ce79231ab11707aa530720dd4771d29f25f78aeea10c60fca6f23c365e25b3c","abstract_canon_sha256":"6c6433032d6de3a41bacd12a2d3c3eca013c06bf13cd283fa5cf2dd3b0607b49"},"schema_version":"1.0"},"canonical_sha256":"cec71c9ae65a080f0efda40dac0a0723051f87f7b23303543b8bcb4547b6ebcc","source":{"kind":"arxiv","id":"1612.00495","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.00495","created_at":"2026-05-18T00:53:47Z"},{"alias_kind":"arxiv_version","alias_value":"1612.00495v3","created_at":"2026-05-18T00:53:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.00495","created_at":"2026-05-18T00:53:47Z"},{"alias_kind":"pith_short_12","alias_value":"Z3DRZGXGLIEA","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"Z3DRZGXGLIEA6DX5","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"Z3DRZGXG","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:Z3DRZGXGLIEA6DX5UQG2YCQHEM","target":"record","payload":{"canonical_record":{"source":{"id":"1612.00495","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-01T22:09:23Z","cross_cats_sorted":[],"title_canon_sha256":"4ce79231ab11707aa530720dd4771d29f25f78aeea10c60fca6f23c365e25b3c","abstract_canon_sha256":"6c6433032d6de3a41bacd12a2d3c3eca013c06bf13cd283fa5cf2dd3b0607b49"},"schema_version":"1.0"},"canonical_sha256":"cec71c9ae65a080f0efda40dac0a0723051f87f7b23303543b8bcb4547b6ebcc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:53:47.556064Z","signature_b64":"xj9EvlP67Oh6DreaYuD9tKid5gll3GYixSAQD7O7Hjy6c0hMhSi9n1kza5UQNRRxQ/fKoroZCKGWguolXVcoCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cec71c9ae65a080f0efda40dac0a0723051f87f7b23303543b8bcb4547b6ebcc","last_reissued_at":"2026-05-18T00:53:47.555641Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:53:47.555641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1612.00495","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:53:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S5txr403M6txZX/JN7sHlhOu4LFnP4DQ7i7y3aznITLhFM4qKFqOhTeMW9oPR+2Z6izKcGWl63pxAJEyqj4oCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T10:37:20.782792Z"},"content_sha256":"e4dfadaa9339c89dfab7dcd1b5160822b0480c8e61555bb5f862005502212310","schema_version":"1.0","event_id":"sha256:e4dfadaa9339c89dfab7dcd1b5160822b0480c8e61555bb5f862005502212310"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:Z3DRZGXGLIEA6DX5UQG2YCQHEM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Unusual void galaxy DDO68: implications of the HST resolved photometry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"D. I. Makarov, L. N. Makarova, S. A. Pustilnik, S. B. Borisov","submitted_at":"2016-12-01T22:09:23Z","abstract_excerpt":"DDO68 (UGC5340) is an unusual dwarf galaxy with extremely low gas metallicity (12+log(O/H) = 7.14) residing in the nearby Lynx-Cancer void. Despite its apparent isolation, it shows both optical and HI morphological evidence for strong tidal disturbance. Here, we study the resolved stellar populations of DDO68 using deep images from the HST archive. We determined a distance of 12.75+-0.41 Mpc using the tip of the red giant branch (TRGB). The star formation history reconstruction reveals that about 60 per cent of stars formed during the initial period of star formation, about 12-14 Gyr ago. Duri"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.00495","kind":"arxiv","version":3},"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":"2026-05-18T00:53:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9TFe3xZ6VRP6TkBoJ7dzkjJRaMPyedhSuThfOCjJnC3rxdFEB2mMy5cQzkIFy+zKsin2Z0buQPau3W2+QLBTCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T10:37:20.783481Z"},"content_sha256":"d9d1b37a000394f1a04bb0a9c1f86ab52526c6243764e5f0176c524682877707","schema_version":"1.0","event_id":"sha256:d9d1b37a000394f1a04bb0a9c1f86ab52526c6243764e5f0176c524682877707"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z3DRZGXGLIEA6DX5UQG2YCQHEM/bundle.json","state_url":"https://pith.science/pith/Z3DRZGXGLIEA6DX5UQG2YCQHEM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z3DRZGXGLIEA6DX5UQG2YCQHEM/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":"2026-05-26T10:37:20Z","links":{"resolver":"https://pith.science/pith/Z3DRZGXGLIEA6DX5UQG2YCQHEM","bundle":"https://pith.science/pith/Z3DRZGXGLIEA6DX5UQG2YCQHEM/bundle.json","state":"https://pith.science/pith/Z3DRZGXGLIEA6DX5UQG2YCQHEM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z3DRZGXGLIEA6DX5UQG2YCQHEM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:Z3DRZGXGLIEA6DX5UQG2YCQHEM","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":"6c6433032d6de3a41bacd12a2d3c3eca013c06bf13cd283fa5cf2dd3b0607b49","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-01T22:09:23Z","title_canon_sha256":"4ce79231ab11707aa530720dd4771d29f25f78aeea10c60fca6f23c365e25b3c"},"schema_version":"1.0","source":{"id":"1612.00495","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.00495","created_at":"2026-05-18T00:53:47Z"},{"alias_kind":"arxiv_version","alias_value":"1612.00495v3","created_at":"2026-05-18T00:53:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.00495","created_at":"2026-05-18T00:53:47Z"},{"alias_kind":"pith_short_12","alias_value":"Z3DRZGXGLIEA","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"Z3DRZGXGLIEA6DX5","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"Z3DRZGXG","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:d9d1b37a000394f1a04bb0a9c1f86ab52526c6243764e5f0176c524682877707","target":"graph","created_at":"2026-05-18T00:53:47Z","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":"DDO68 (UGC5340) is an unusual dwarf galaxy with extremely low gas metallicity (12+log(O/H) = 7.14) residing in the nearby Lynx-Cancer void. Despite its apparent isolation, it shows both optical and HI morphological evidence for strong tidal disturbance. Here, we study the resolved stellar populations of DDO68 using deep images from the HST archive. We determined a distance of 12.75+-0.41 Mpc using the tip of the red giant branch (TRGB). The star formation history reconstruction reveals that about 60 per cent of stars formed during the initial period of star formation, about 12-14 Gyr ago. Duri","authors_text":"D. I. Makarov, L. N. Makarova, S. A. Pustilnik, S. B. Borisov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-01T22:09:23Z","title":"Unusual void galaxy DDO68: implications of the HST resolved photometry"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.00495","kind":"arxiv","version":3},"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:e4dfadaa9339c89dfab7dcd1b5160822b0480c8e61555bb5f862005502212310","target":"record","created_at":"2026-05-18T00:53:47Z","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":"6c6433032d6de3a41bacd12a2d3c3eca013c06bf13cd283fa5cf2dd3b0607b49","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-01T22:09:23Z","title_canon_sha256":"4ce79231ab11707aa530720dd4771d29f25f78aeea10c60fca6f23c365e25b3c"},"schema_version":"1.0","source":{"id":"1612.00495","kind":"arxiv","version":3}},"canonical_sha256":"cec71c9ae65a080f0efda40dac0a0723051f87f7b23303543b8bcb4547b6ebcc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cec71c9ae65a080f0efda40dac0a0723051f87f7b23303543b8bcb4547b6ebcc","first_computed_at":"2026-05-18T00:53:47.555641Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:53:47.555641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xj9EvlP67Oh6DreaYuD9tKid5gll3GYixSAQD7O7Hjy6c0hMhSi9n1kza5UQNRRxQ/fKoroZCKGWguolXVcoCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:53:47.556064Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.00495","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e4dfadaa9339c89dfab7dcd1b5160822b0480c8e61555bb5f862005502212310","sha256:d9d1b37a000394f1a04bb0a9c1f86ab52526c6243764e5f0176c524682877707"],"state_sha256":"72cdb00f5b36b2d3b0d20d6120a35389a8107f7e103848fcbab9b4b7da005e48"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wHXc8oNPvijuhXOLX3quiOZuLvrveiiNP/5hgggsf79QP76NatJ0ydlMQDhwnslwY3tVL2Sy6U74ue3QjmNoDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T10:37:20.786894Z","bundle_sha256":"bbd625dd4f1cf077124ee601853df9d96c2c2f21d990af48cbd8a2f9af3a5cee"}}