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These two tasks can be accomplished via photochemistry, lightning, impacts, or volcanism. The key requirements for producing appreciable amounts of HCN are the free availability of N$_2$ and a local carbon to oxygen ratio of C/O $\\geq 1$. We discuss the chemical mechanisms by which HCN can be formed and destroyed on rocky exoplane"},"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":"1902.08022","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-02-21T13:13:01Z","cross_cats_sorted":[],"title_canon_sha256":"a216b7a7f5ce7a815b92092d94d85cee930c60044b00495a50fd2cadfa5de761","abstract_canon_sha256":"5e328e1d516f5e66200f7499ad81454de42976be4bca0556efc6d85cdf831732"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:45:29.693373Z","signature_b64":"iRv15Nz3iMi4qfOazAM/6cWB+WjtiX/qoSvvT8K8uhnR0RCREljJI8w91OyeXNeiUjk4EGsQYy9yMIcRfC6PDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3694e54eae27a5573f1bb6157693953bfa78914313d0fde369853cff80ea10a7","last_reissued_at":"2026-05-17T23:45:29.692685Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:45:29.692685Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Hydrogen Cyanide in Nitrogen-Rich Atmospheres of Rocky Exoplanets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Paul B. 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