{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:5DV24ZPJSX6SHEYUVENMBK6VHW","short_pith_number":"pith:5DV24ZPJ","canonical_record":{"source":{"id":"astro-ph/0607077","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-07-05T15:28:01Z","cross_cats_sorted":[],"title_canon_sha256":"5ab83ea5e52294f398d86a9378fe698460d4d7fa7440f547f094d5d2550b88b7","abstract_canon_sha256":"eeaa4cc4c5386300bf8eb7437049066306b8203c122f3b9215bd2c88cadf9a88"},"schema_version":"1.0"},"canonical_sha256":"e8ebae65e995fd239314a91ac0abd53da69365ac01def4e911f92421277f8eb3","source":{"kind":"arxiv","id":"astro-ph/0607077","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0607077","created_at":"2026-05-18T01:40:30Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0607077v1","created_at":"2026-05-18T01:40:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0607077","created_at":"2026-05-18T01:40:30Z"},{"alias_kind":"pith_short_12","alias_value":"5DV24ZPJSX6S","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"5DV24ZPJSX6SHEYU","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"5DV24ZPJ","created_at":"2026-05-18T12:25:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:5DV24ZPJSX6SHEYUVENMBK6VHW","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0607077","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-07-05T15:28:01Z","cross_cats_sorted":[],"title_canon_sha256":"5ab83ea5e52294f398d86a9378fe698460d4d7fa7440f547f094d5d2550b88b7","abstract_canon_sha256":"eeaa4cc4c5386300bf8eb7437049066306b8203c122f3b9215bd2c88cadf9a88"},"schema_version":"1.0"},"canonical_sha256":"e8ebae65e995fd239314a91ac0abd53da69365ac01def4e911f92421277f8eb3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:30.119222Z","signature_b64":"+w1jqY4TFMP/yrkF2LNE/Y6fOhYIj831Jcpeo8sZ2LqMIW+tCrRWHJcJqGgU7beraAfZzOXbJhlTCn4dPvEzDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e8ebae65e995fd239314a91ac0abd53da69365ac01def4e911f92421277f8eb3","last_reissued_at":"2026-05-18T01:40:30.118477Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:30.118477Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0607077","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":"2026-05-18T01:40:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A1lnMXjOeO7gBQJPNy/x2nsXA2/PubOfnvczpFqhSTyujPtReFT9a3sm8DEwGkqosZqqHMi/XieY7RKd6/foAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T16:32:06.851187Z"},"content_sha256":"106d46976a208d0a75c19bcfe27347544e4e1347c5c0aec7f7e26d372b10ad54","schema_version":"1.0","event_id":"sha256:106d46976a208d0a75c19bcfe27347544e4e1347c5c0aec7f7e26d372b10ad54"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:5DV24ZPJSX6SHEYUVENMBK6VHW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards the Event Horizon - High Resolution VLBI Imaging of Nuclei of Active Galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.E.E. Rogers, A. Greve, A. Witzel, D.A. Graham, H. Fagg, J.A. Zensus, L. Ziurys, M. Bremer, M. Grewing, P. Strittmatter, R.B. Phillips, S. Doeleman, T.P. Krichbaum","submitted_at":"2006-07-05T15:28:01Z","abstract_excerpt":"We report on new developments in VLBI, with emphasis on experiments performed at the highest frequencies possible to date (so called mm-VLBI). We have observed the nucleus of M 87 (Virgo A) with global VLBI at 3 mm. We show a new image of the inner-most jet region with an angular resolution of approx. 300 x 60 micro-arcseconds. In terms of Schwarzschild radii, this leads to an upper limit of the jet base of approx. 100 x 20 Schwarzschild radii. We also report on two VLBI pilot-experiments, which demonstrate the technical feasibility of global VLBI at 150 and 230 GHz (2 mm and 1.3 mm). The expe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0607077","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":"2026-05-18T01:40:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KdTw2r6zabwrCW6Dfa/GFCuTSwJtwAIVK2ezwgN0PU+8XCaMiJdAoC1s/hr2ZJfzNYJdJbyb4X/o5csXjQosAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T16:32:06.851928Z"},"content_sha256":"48789e0cb362e143676c3a5ef4879ad8c890e88c8ed537a50cd0e23fd037f886","schema_version":"1.0","event_id":"sha256:48789e0cb362e143676c3a5ef4879ad8c890e88c8ed537a50cd0e23fd037f886"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5DV24ZPJSX6SHEYUVENMBK6VHW/bundle.json","state_url":"https://pith.science/pith/5DV24ZPJSX6SHEYUVENMBK6VHW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5DV24ZPJSX6SHEYUVENMBK6VHW/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":"2026-05-31T16:32:06Z","links":{"resolver":"https://pith.science/pith/5DV24ZPJSX6SHEYUVENMBK6VHW","bundle":"https://pith.science/pith/5DV24ZPJSX6SHEYUVENMBK6VHW/bundle.json","state":"https://pith.science/pith/5DV24ZPJSX6SHEYUVENMBK6VHW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5DV24ZPJSX6SHEYUVENMBK6VHW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:5DV24ZPJSX6SHEYUVENMBK6VHW","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":"eeaa4cc4c5386300bf8eb7437049066306b8203c122f3b9215bd2c88cadf9a88","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-07-05T15:28:01Z","title_canon_sha256":"5ab83ea5e52294f398d86a9378fe698460d4d7fa7440f547f094d5d2550b88b7"},"schema_version":"1.0","source":{"id":"astro-ph/0607077","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0607077","created_at":"2026-05-18T01:40:30Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0607077v1","created_at":"2026-05-18T01:40:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0607077","created_at":"2026-05-18T01:40:30Z"},{"alias_kind":"pith_short_12","alias_value":"5DV24ZPJSX6S","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"5DV24ZPJSX6SHEYU","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"5DV24ZPJ","created_at":"2026-05-18T12:25:53Z"}],"graph_snapshots":[{"event_id":"sha256:48789e0cb362e143676c3a5ef4879ad8c890e88c8ed537a50cd0e23fd037f886","target":"graph","created_at":"2026-05-18T01:40:30Z","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 report on new developments in VLBI, with emphasis on experiments performed at the highest frequencies possible to date (so called mm-VLBI). We have observed the nucleus of M 87 (Virgo A) with global VLBI at 3 mm. We show a new image of the inner-most jet region with an angular resolution of approx. 300 x 60 micro-arcseconds. In terms of Schwarzschild radii, this leads to an upper limit of the jet base of approx. 100 x 20 Schwarzschild radii. We also report on two VLBI pilot-experiments, which demonstrate the technical feasibility of global VLBI at 150 and 230 GHz (2 mm and 1.3 mm). The expe","authors_text":"A.E.E. Rogers, A. Greve, A. Witzel, D.A. Graham, H. Fagg, J.A. Zensus, L. Ziurys, M. Bremer, M. Grewing, P. Strittmatter, R.B. Phillips, S. Doeleman, T.P. Krichbaum","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2006-07-05T15:28:01Z","title":"Towards the Event Horizon - High Resolution VLBI Imaging of Nuclei of Active Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0607077","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":"sha256:106d46976a208d0a75c19bcfe27347544e4e1347c5c0aec7f7e26d372b10ad54","target":"record","created_at":"2026-05-18T01:40:30Z","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":"eeaa4cc4c5386300bf8eb7437049066306b8203c122f3b9215bd2c88cadf9a88","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-07-05T15:28:01Z","title_canon_sha256":"5ab83ea5e52294f398d86a9378fe698460d4d7fa7440f547f094d5d2550b88b7"},"schema_version":"1.0","source":{"id":"astro-ph/0607077","kind":"arxiv","version":1}},"canonical_sha256":"e8ebae65e995fd239314a91ac0abd53da69365ac01def4e911f92421277f8eb3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e8ebae65e995fd239314a91ac0abd53da69365ac01def4e911f92421277f8eb3","first_computed_at":"2026-05-18T01:40:30.118477Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:40:30.118477Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+w1jqY4TFMP/yrkF2LNE/Y6fOhYIj831Jcpeo8sZ2LqMIW+tCrRWHJcJqGgU7beraAfZzOXbJhlTCn4dPvEzDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:40:30.119222Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0607077","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:106d46976a208d0a75c19bcfe27347544e4e1347c5c0aec7f7e26d372b10ad54","sha256:48789e0cb362e143676c3a5ef4879ad8c890e88c8ed537a50cd0e23fd037f886"],"state_sha256":"a4728940a3ff3a9f3137a70355697d1e075426f4a97b07427f80df860d45cbbd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bHy/J/7Bi6zZI0uW9BKUtuTJzsGqRc+mNXyFqrzHjYMmPC2nJRzXrorTV8PBWJpZv7vbb+XJ6xmDQxATL//TAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T16:32:06.856155Z","bundle_sha256":"b19f88e304362e89d019688873e49304f25350d8d043eded4d640b564f8d203f"}}