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Methods: We analyzed and compared 26 VLBI observations of the M87 jet, obtained between 2006 and 2011 with the Very Long Baseline Array (VLBA) at 1.7 GHz and the European VLBI Network (EVN) at 5 GHz. Results: HST-1 is detected at all epochs; we model-fitted its complex structure with two or more components, the two outermost of which display a significant proper motion with a superluminal veloc"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1202.0013","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-01-31T21:01:05Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"69e9de2b11002b73c55431105fdf1212b24d8576cec142349436cfaffd3a4f39","abstract_canon_sha256":"e691d730f6b6cad51f935db612453ad8d41289d59dcd906355f8ff0119fef0b4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:37.274007Z","signature_b64":"V7QhHeUCjeR2NgUxtzF/pBvKAj/T9TxsJkcuYxUniAoA0C7f4u1YPpVMjX+EfoX+p1L7j8xrMDxTAZQioM/xAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5f26037633cac30b717ed2d76bc41b49e8025c7a1120b208e41d6dfffb859789","last_reissued_at":"2026-05-18T01:58:37.273401Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:37.273401Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The kinematic of HST-1 in the jet of M87","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.CO","authors_text":"A. 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