{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:HR3WQYMAGVL2DGR6VRG3E6LOHC","short_pith_number":"pith:HR3WQYMA","canonical_record":{"source":{"id":"1208.3440","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-08-16T18:56:25Z","cross_cats_sorted":[],"title_canon_sha256":"f9aad48f9d873e008c69ef6546fe0dd8b7e6b17ec8f7df7a0e1e4e0a3933b3bb","abstract_canon_sha256":"f897f2e8c2e70068279cbf82576e0ac6b2577479f52f5bc8bb4b57de5a4d3df7"},"schema_version":"1.0"},"canonical_sha256":"3c776861803557a19a3eac4db2796e389aefa68fd69bd576873fcceb5d476f6f","source":{"kind":"arxiv","id":"1208.3440","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.3440","created_at":"2026-05-18T01:55:15Z"},{"alias_kind":"arxiv_version","alias_value":"1208.3440v1","created_at":"2026-05-18T01:55:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.3440","created_at":"2026-05-18T01:55:15Z"},{"alias_kind":"pith_short_12","alias_value":"HR3WQYMAGVL2","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HR3WQYMAGVL2DGR6","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HR3WQYMA","created_at":"2026-05-18T12:27:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:HR3WQYMAGVL2DGR6VRG3E6LOHC","target":"record","payload":{"canonical_record":{"source":{"id":"1208.3440","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-08-16T18:56:25Z","cross_cats_sorted":[],"title_canon_sha256":"f9aad48f9d873e008c69ef6546fe0dd8b7e6b17ec8f7df7a0e1e4e0a3933b3bb","abstract_canon_sha256":"f897f2e8c2e70068279cbf82576e0ac6b2577479f52f5bc8bb4b57de5a4d3df7"},"schema_version":"1.0"},"canonical_sha256":"3c776861803557a19a3eac4db2796e389aefa68fd69bd576873fcceb5d476f6f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:55:15.198382Z","signature_b64":"nGmmXx/NI/iqcYuyCtnsPJReDk2SvnVN6FB9kt5yUf7gK+o2CRPFU5FveigdkR84r/QSXCtyl4eFAU87+erECA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3c776861803557a19a3eac4db2796e389aefa68fd69bd576873fcceb5d476f6f","last_reissued_at":"2026-05-18T01:55:15.197968Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:55:15.197968Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1208.3440","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":"2026-05-18T01:55:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ig78oz/K4K1Umb2gGyuBF2bl+98QseNo9Q35ASaiEjnl3sJRtvnBfB7Vsu+VTims521BOLT/vscXdxAEqUbDDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T11:43:52.169291Z"},"content_sha256":"212e0029cd60e87f6e942ecb7825e512454a6dab35291a42a9a91fab0986c273","schema_version":"1.0","event_id":"sha256:212e0029cd60e87f6e942ecb7825e512454a6dab35291a42a9a91fab0986c273"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:HR3WQYMAGVL2DGR6VRG3E6LOHC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Magnetic field reversals and galactic dynamos","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"David Moss, Dmitri Sokoloff","submitted_at":"2012-08-16T18:56:25Z","abstract_excerpt":"We argue that global magnetic field reversals similar to those observed in the Milky Way occur quite frequently in mean-field galactic dynamo models that have relatively strong, random, seed magnetic fields that are localized in discrete regions. The number of reversals decreases to zero with reduction of the seed strength, efficiency of the galactic dynamo and size of the spots of the seed field. A systematic observational search for magnetic field reversals in a representative sample of spiral galaxies promises to give valuable information concerning seed magnetic fields and, in this way, to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.3440","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":"2026-05-18T01:55:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wwWnW5LrjOUWEoeTY9sWeOZfa9EbYsRyo2FCT6iBBPFd/ct+lTvfqXYvXZJsG+FpmFE7EmdkbOT7SfmmMYm8DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T11:43:52.169666Z"},"content_sha256":"6d5bdc55b87a64eb329e207ec86e66b3b3fee5d2182b1ac30be21c44ec3a3c79","schema_version":"1.0","event_id":"sha256:6d5bdc55b87a64eb329e207ec86e66b3b3fee5d2182b1ac30be21c44ec3a3c79"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HR3WQYMAGVL2DGR6VRG3E6LOHC/bundle.json","state_url":"https://pith.science/pith/HR3WQYMAGVL2DGR6VRG3E6LOHC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HR3WQYMAGVL2DGR6VRG3E6LOHC/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":"2026-06-01T11:43:52Z","links":{"resolver":"https://pith.science/pith/HR3WQYMAGVL2DGR6VRG3E6LOHC","bundle":"https://pith.science/pith/HR3WQYMAGVL2DGR6VRG3E6LOHC/bundle.json","state":"https://pith.science/pith/HR3WQYMAGVL2DGR6VRG3E6LOHC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HR3WQYMAGVL2DGR6VRG3E6LOHC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:HR3WQYMAGVL2DGR6VRG3E6LOHC","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":"f897f2e8c2e70068279cbf82576e0ac6b2577479f52f5bc8bb4b57de5a4d3df7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-08-16T18:56:25Z","title_canon_sha256":"f9aad48f9d873e008c69ef6546fe0dd8b7e6b17ec8f7df7a0e1e4e0a3933b3bb"},"schema_version":"1.0","source":{"id":"1208.3440","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.3440","created_at":"2026-05-18T01:55:15Z"},{"alias_kind":"arxiv_version","alias_value":"1208.3440v1","created_at":"2026-05-18T01:55:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.3440","created_at":"2026-05-18T01:55:15Z"},{"alias_kind":"pith_short_12","alias_value":"HR3WQYMAGVL2","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HR3WQYMAGVL2DGR6","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HR3WQYMA","created_at":"2026-05-18T12:27:09Z"}],"graph_snapshots":[{"event_id":"sha256:6d5bdc55b87a64eb329e207ec86e66b3b3fee5d2182b1ac30be21c44ec3a3c79","target":"graph","created_at":"2026-05-18T01:55:15Z","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":"We argue that global magnetic field reversals similar to those observed in the Milky Way occur quite frequently in mean-field galactic dynamo models that have relatively strong, random, seed magnetic fields that are localized in discrete regions. The number of reversals decreases to zero with reduction of the seed strength, efficiency of the galactic dynamo and size of the spots of the seed field. A systematic observational search for magnetic field reversals in a representative sample of spiral galaxies promises to give valuable information concerning seed magnetic fields and, in this way, to","authors_text":"David Moss, Dmitri Sokoloff","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-08-16T18:56:25Z","title":"Magnetic field reversals and galactic dynamos"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.3440","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":"sha256:212e0029cd60e87f6e942ecb7825e512454a6dab35291a42a9a91fab0986c273","target":"record","created_at":"2026-05-18T01:55:15Z","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":"f897f2e8c2e70068279cbf82576e0ac6b2577479f52f5bc8bb4b57de5a4d3df7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-08-16T18:56:25Z","title_canon_sha256":"f9aad48f9d873e008c69ef6546fe0dd8b7e6b17ec8f7df7a0e1e4e0a3933b3bb"},"schema_version":"1.0","source":{"id":"1208.3440","kind":"arxiv","version":1}},"canonical_sha256":"3c776861803557a19a3eac4db2796e389aefa68fd69bd576873fcceb5d476f6f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3c776861803557a19a3eac4db2796e389aefa68fd69bd576873fcceb5d476f6f","first_computed_at":"2026-05-18T01:55:15.197968Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:55:15.197968Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nGmmXx/NI/iqcYuyCtnsPJReDk2SvnVN6FB9kt5yUf7gK+o2CRPFU5FveigdkR84r/QSXCtyl4eFAU87+erECA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:55:15.198382Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.3440","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:212e0029cd60e87f6e942ecb7825e512454a6dab35291a42a9a91fab0986c273","sha256:6d5bdc55b87a64eb329e207ec86e66b3b3fee5d2182b1ac30be21c44ec3a3c79"],"state_sha256":"c94bc500e0fdeed96385f1f95468679f99396c168bd16b5781ad501e2a562fdd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+Yv1+ddkMnSgrcmODiJ1u/k62pRtNlyKvNauB+hNL9S+QyOX6V963E6Ej6a8r5YWAjPHzBazle2PoIzYJBIODw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T11:43:52.171801Z","bundle_sha256":"feeb46188c84aedf5c9712cb5006f6e3f65e9d6e9e135fb9be4b4d9eec6614e9"}}