{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:G2RVH6KB2FTLGINWBX7HEYCESY","short_pith_number":"pith:G2RVH6KB","canonical_record":{"source":{"id":"2606.25137","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-23T20:07:34Z","cross_cats_sorted":[],"title_canon_sha256":"39e63d6b1744ac9c566e87cdefcccaf553d8437c6b1c6800fdaaf9df5b5eac9a","abstract_canon_sha256":"15f02309706a6d62cedb21bf6abd3e1e90e56d8a528bf44e5deffeb42573da23"},"schema_version":"1.0"},"canonical_sha256":"36a353f941d166b321b60dfe72604496106066abd3b24543031bd4b054ebe51b","source":{"kind":"arxiv","id":"2606.25137","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.25137","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"arxiv_version","alias_value":"2606.25137v1","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.25137","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"pith_short_12","alias_value":"G2RVH6KB2FTL","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"pith_short_16","alias_value":"G2RVH6KB2FTLGINW","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"pith_short_8","alias_value":"G2RVH6KB","created_at":"2026-06-25T00:18:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:G2RVH6KB2FTLGINWBX7HEYCESY","target":"record","payload":{"canonical_record":{"source":{"id":"2606.25137","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-23T20:07:34Z","cross_cats_sorted":[],"title_canon_sha256":"39e63d6b1744ac9c566e87cdefcccaf553d8437c6b1c6800fdaaf9df5b5eac9a","abstract_canon_sha256":"15f02309706a6d62cedb21bf6abd3e1e90e56d8a528bf44e5deffeb42573da23"},"schema_version":"1.0"},"canonical_sha256":"36a353f941d166b321b60dfe72604496106066abd3b24543031bd4b054ebe51b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-25T00:18:19.049061Z","signature_b64":"XzsHdmjAgHkZMi4G/S0WzzUmqk19JvCUirhMzSIT6jHcW5HM3jesgYjxOa60Ew+O092IGc+6YbXPLc13FsI8Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"36a353f941d166b321b60dfe72604496106066abd3b24543031bd4b054ebe51b","last_reissued_at":"2026-06-25T00:18:19.048703Z","signature_status":"signed_v1","first_computed_at":"2026-06-25T00:18:19.048703Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.25137","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":"2026-06-25T00:18:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NwVVEwz6P03wcYTD5YnBBxjHuf01bj6AFYhr0Z26mJHU7+x+uT0AjT4SdjpiBMx38tICZyLFTEU/aKTiGSGPCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T16:13:25.387398Z"},"content_sha256":"e2e16ec2a5d2a78976c612c8c14446d410f71fd978a1c07edfa716bc354617f7","schema_version":"1.0","event_id":"sha256:e2e16ec2a5d2a78976c612c8c14446d410f71fd978a1c07edfa716bc354617f7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:G2RVH6KB2FTLGINWBX7HEYCESY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Unique Science Opportunities for Space VLBI Systems with the SKA Telescopes","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. B. Pushkarev, A. Tamar, A. V. Plavin, A. V. Popkov, C. Garcia-Miro, E. Traianou, E. V. Kravchenko, G. Bruni, H. E. Bignall, I. Liodakis, J.-Y. Kim, L. I. Gurvits, M. Giroletti, M. Kadler, P. G. Edwards, T. An, T. Savolainen, Y. Q. Liu, Y. Y. Kovalev, Z.-Q. Shen","submitted_at":"2026-06-23T20:07:34Z","abstract_excerpt":"To date, two dedicated Space Very Long Baseline Interferometry (SVLBI) missions, the VLBI Space Observatory Programme (VSOP) and RadioAstron, have provided groundbreaking insights into the Universe at angular resolutions as fine as ~10 microarcseconds. The phased SKA-Mid, with its exceptional sensitivity and broad frequency coverage, will form a unique ground-based anchor for future SVLBI missions, driving major advances into previously unexplored regions of the angular resolution-sensitivity parameter space. The discovery of extreme brightness temperatures in blazars by RadioAstron demands de"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.25137","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/2606.25137/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":"2026-06-25T00:18:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"agfuMCakFHVyL+2p0thf8IRg6TB2W4rIYLoNsBrHKHYvE3wNyGBABRsYvsunkOHpWB6hye+OcG12W/1hdIAJAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T16:13:25.387784Z"},"content_sha256":"fc5f92bac0717dde4292f93549b5f1526987419049a7d591e9a4d551ab3ca340","schema_version":"1.0","event_id":"sha256:fc5f92bac0717dde4292f93549b5f1526987419049a7d591e9a4d551ab3ca340"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G2RVH6KB2FTLGINWBX7HEYCESY/bundle.json","state_url":"https://pith.science/pith/G2RVH6KB2FTLGINWBX7HEYCESY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G2RVH6KB2FTLGINWBX7HEYCESY/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":"2026-06-26T16:13:25Z","links":{"resolver":"https://pith.science/pith/G2RVH6KB2FTLGINWBX7HEYCESY","bundle":"https://pith.science/pith/G2RVH6KB2FTLGINWBX7HEYCESY/bundle.json","state":"https://pith.science/pith/G2RVH6KB2FTLGINWBX7HEYCESY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G2RVH6KB2FTLGINWBX7HEYCESY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:G2RVH6KB2FTLGINWBX7HEYCESY","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":"15f02309706a6d62cedb21bf6abd3e1e90e56d8a528bf44e5deffeb42573da23","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-23T20:07:34Z","title_canon_sha256":"39e63d6b1744ac9c566e87cdefcccaf553d8437c6b1c6800fdaaf9df5b5eac9a"},"schema_version":"1.0","source":{"id":"2606.25137","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.25137","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"arxiv_version","alias_value":"2606.25137v1","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.25137","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"pith_short_12","alias_value":"G2RVH6KB2FTL","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"pith_short_16","alias_value":"G2RVH6KB2FTLGINW","created_at":"2026-06-25T00:18:19Z"},{"alias_kind":"pith_short_8","alias_value":"G2RVH6KB","created_at":"2026-06-25T00:18:19Z"}],"graph_snapshots":[{"event_id":"sha256:fc5f92bac0717dde4292f93549b5f1526987419049a7d591e9a4d551ab3ca340","target":"graph","created_at":"2026-06-25T00:18:19Z","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/2606.25137/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"To date, two dedicated Space Very Long Baseline Interferometry (SVLBI) missions, the VLBI Space Observatory Programme (VSOP) and RadioAstron, have provided groundbreaking insights into the Universe at angular resolutions as fine as ~10 microarcseconds. The phased SKA-Mid, with its exceptional sensitivity and broad frequency coverage, will form a unique ground-based anchor for future SVLBI missions, driving major advances into previously unexplored regions of the angular resolution-sensitivity parameter space. The discovery of extreme brightness temperatures in blazars by RadioAstron demands de","authors_text":"A. B. Pushkarev, A. Tamar, A. V. Plavin, A. V. Popkov, C. Garcia-Miro, E. Traianou, E. V. Kravchenko, G. Bruni, H. E. Bignall, I. Liodakis, J.-Y. Kim, L. I. Gurvits, M. Giroletti, M. Kadler, P. G. Edwards, T. An, T. Savolainen, Y. Q. Liu, Y. Y. Kovalev, Z.-Q. Shen","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-23T20:07:34Z","title":"Unique Science Opportunities for Space VLBI Systems with the SKA Telescopes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.25137","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:e2e16ec2a5d2a78976c612c8c14446d410f71fd978a1c07edfa716bc354617f7","target":"record","created_at":"2026-06-25T00:18:19Z","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":"15f02309706a6d62cedb21bf6abd3e1e90e56d8a528bf44e5deffeb42573da23","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-23T20:07:34Z","title_canon_sha256":"39e63d6b1744ac9c566e87cdefcccaf553d8437c6b1c6800fdaaf9df5b5eac9a"},"schema_version":"1.0","source":{"id":"2606.25137","kind":"arxiv","version":1}},"canonical_sha256":"36a353f941d166b321b60dfe72604496106066abd3b24543031bd4b054ebe51b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"36a353f941d166b321b60dfe72604496106066abd3b24543031bd4b054ebe51b","first_computed_at":"2026-06-25T00:18:19.048703Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-25T00:18:19.048703Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XzsHdmjAgHkZMi4G/S0WzzUmqk19JvCUirhMzSIT6jHcW5HM3jesgYjxOa60Ew+O092IGc+6YbXPLc13FsI8Aw==","signature_status":"signed_v1","signed_at":"2026-06-25T00:18:19.049061Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.25137","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e2e16ec2a5d2a78976c612c8c14446d410f71fd978a1c07edfa716bc354617f7","sha256:fc5f92bac0717dde4292f93549b5f1526987419049a7d591e9a4d551ab3ca340"],"state_sha256":"184005f4620b4ae0f687056dadd377bab05875d6030af714a04c84d95d40fb9e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CVRJfttUopDRJZS8Kt2xOFQFtMIvoZUiokrzAGiDHncmjS0uRPkh9UJQYYnb+S7EMTztJl1zjS9f+ff1yYyAAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T16:13:25.390023Z","bundle_sha256":"71f55722d9ca026a3f595ed42cbf1aba2eaf2566079c243a02c9392221b0657c"}}